Freely-available Literature

Currently indexing 3840 freely-available titles

The following titles are freely-available, or include a link to a preprint or postprint.

Life below water: Fish spawning aggregations as bright spots for a sustainable ocean

Pittman SJ, Heyman WD. Life below water: Fish spawning aggregations as bright spots for a sustainable ocean. Conservation Letters [Internet]. 2020 . Available from: https://conbio.onlinelibrary.wiley.com/doi/full/10.1111/conl.12722
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Transient fish spawning aggregations (FSAs) are critical life‐cycle events for many commercially important species, in which fish congregate in huge numbers to spawn at predictable times and places. This behavior makes them exceptionally vulnerable to fishing. The “illusion of plenty” and poor access to monitoring tools and techniques has resulted in some FSAs being overfished or unwittingly eliminated. We present a co‐conservation network, formally linking site‐focused partners who cooperatively monitor and actively manage multispecies FSAs. FSA sites and networks offer great potential as conservation bright spots to replenish fished populations, rehabilitate marine ecosystems, and ensure the flow of ecosystem services to the millions of people that rely upon them for their wellbeing. We call for urgent global recognition of FSAs as effective spatial nexus for addressing multiple interconnected global policy targets for a sustainable ocean.

Future ocean biomass losses may widen socioeconomic equity gaps

Boyce DG, Lotze HK, Tittensor DP, Carozza DA, Worm B. Future ocean biomass losses may widen socioeconomic equity gaps. Nature Communications [Internet]. 2020 ;11(1). Available from: https://www.nature.com/articles/s41467-020-15708-9
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

 Future climate impacts and their consequences are increasingly being explored using multi-model ensembles that average across individual model projections. Here we develop a statistical framework that integrates projections from coupled ecosystem and earth-system models to evaluate significance and uncertainty in marine animal biomass changes over the 21st century in relation to socioeconomic indicators at national to global scales. Significant biomass changes are projected in 40%–57% of the global ocean, with 68%–84% of these areas exhibiting declining trends under low and high emission scenarios, respectively. Given unabated emissions, maritime nations with poor socioeconomic statuses such as low nutrition, wealth, and ocean health will experience the greatest projected losses. These findings suggest that climate-driven biomass changes will widen existing equity gaps and disproportionally affect populations that contributed least to global CO2 emissions. However, our analysis also suggests that such deleterious outcomes are largely preventable by achieving negative emissions (RCP 2.6).

Assessing marine spatial planning governmentality

Flannery W, McAteer B. Assessing marine spatial planning governmentality. Maritime Studies [Internet]. 2020 . Available from: https://link.springer.com/article/10.1007/s40152-020-00174-2
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Marine spatial planning (MSP) is advanced by its champions as an impartial and rational process that can address complex management issues. We argue that MSP is not innately rational and that it problematises marine issues in specific ways, often reflecting hegemonic agendas. The illusion of impartial rationality in MSP is derived from governmentalities that appear progressive but serve elite interests. By understanding the creation of governmentalities, we can design more equitable planning processes. We conceptualise governmentalities as consisting of problematisations, rationalities and governance technologies, and assess England’s first marine plans to understand how specific governmentalities de-radicalise MSP. We find that progressive framings of MSP outcomes, such as enhanced well-being, are deployed by the government to garner early support for MSP. These elements, however, become regressively problematised in later planning phases, where they are framed by the government as being difficult to achieve and are pushed into future iterations of the process. Eviscerating progressive elements from the planning process clears the way for the government to focus on implementing a neoliberal form of MSP. Efforts to foster radical MSP must pay attention to the emergence of governmentalities, how they travel through time/space and be cognisant of where difference can be inserted into planning processes. Achieving progressive MSP will require the creation of a political frontier early in the process, which cannot be passed until pathways for progressive socio-environmental outcomes have been established; advocacy for disenfranchised groups; broadening MSP evaluations to account for unintended impacts; and the monitoring of progressive objectives.

The whence and whither of marine spatial planning: revisiting the social reconstruction of the marine environment in the UK

Ritchie H, McElduff L. The whence and whither of marine spatial planning: revisiting the social reconstruction of the marine environment in the UK. Maritime Studies [Internet]. 2020 . Available from: https://link.springer.com/article/10.1007%2Fs40152-020-00170-6
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

With the concept of marine spatial planning (MSP) firmly established in the UK with its own legislation, policies and plans underway, this paper critically revisits MSP as part of the wider debate associated with the social reconstruction of the marine environment, as first discussed by Peel and Lloyd’s seminal paper in 2004. We propose that their identified ‘marine problem’ remains and indeed has exacerbated. We ascertain that there has been much change in the governance of the marine environment that has both positively and negatively altered the way that society has (re)constructed solutions to that marine problem. We revisit Hannigan’s (1995) social constructionist framework, showing the degree to which the prerequisites have been satisfied, by providing an overview of how the marine problem has intensified in the preceding 15 years and how the marine problem has now captured the wider public’s attention. We then look at the how the response to the marine problem has evolved by examining at the current marine planning arrangements across the UK. We conclude by stating that the whence of MSP is clear, culminating with the formal introduction of MSP in the UK which has positively altered the way in which the marine environment is socially reconstructed. The whither is much more unclear. With a continually rapidly moving agenda of change, there is much more to be done for us to say that the marine problem has been successfully socially reconstructed.

Projected Economic Impact of Climate Change on Marine Capture Fisheries in the Philippines

Suh D, Pomeroy R. Projected Economic Impact of Climate Change on Marine Capture Fisheries in the Philippines. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00232/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Climate change and its impact on fisheries is a key issue for fishing nations, particularly the Philippines. The Philippines is highly vulnerable to the impacts of climate change on fisheries and it can lead to economic shock on the nation's economy. This paper examines the impact of climate change on marine capture fisheries in the Philippines using a computable general equilibrium (CGE) model to elaborate and project impacts on the national economy. In the simulation, one baseline scenario and two climate change scenarios based on greenhouse gas concentration—RCP 2.6 and RCP 8.5—were considered. The model focuses on Gross Domestic Product (GDP) and income distribution by region, which can represent economic conditions in terms of economic growth and distribution. Results show that there will be a negative change on both the fisheries and economic variables where more extreme changes in climate occur.

Small is beautiful, but large is certified: A comparison between fisheries the Marine Stewardship Council (MSC) features in its promotional materials and MSC-certified fisheries

Le Manach F, Jacquet JL, Bailey M, Jouanneau C, Nouvian C. Small is beautiful, but large is certified: A comparison between fisheries the Marine Stewardship Council (MSC) features in its promotional materials and MSC-certified fisheries Hyrenbach D. PLOS ONE [Internet]. 2020 ;15(5):e0231073. Available from: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0231073
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

The Marine Stewardship Council (MSC) sets a standard by which sustainable fisheries can be assessed and eco-certified. It is one of the oldest and most well-known fisheries certifications, and an estimated 15% of global fish catch is MSC-certified. While the MSC is increasingly recognized by decision-makers as an indicator for fishery success, it is also criticized for weak standards and overly-lenient third-party certifiers. This gap between the standard’s reputation and its actual implementation could be a result of how the MSC markets and promotes its brand. Here we classify MSC-certified fisheries by gear type (i.e. active vs. passive) as well as by length of the vessels involved (i.e. large scale vs. small scale; with the division between the two occurring at 12 m in overall length). We compared the MSC-certified fisheries (until 31 December 2017) to 399 photographs the MSC used in promotional materials since 2009. Results show that fisheries involving small-scale vessels and passive gears were disproportionately represented in promotional materials: 64% of promotional photographs were of passive gears, although only 40% of MSC-certified fisheries and 17% of the overall catch were caught by passive gears from 2009–2017. Similarly, 49% of the photographs featured small-scale vessels, although just 20% of MSC-certified fisheries and 7% of the overall MSC-certified catch used small-scale vessels from 2009 to 2017. The MSC disproportionately features photographs of small-scale fisheries although the catch it certifies is overwhelmingly from industrial fisheries.

Detect coastal disturbances and climate change effects in coralligenous community through sentinel stations

García-Gómez JC, González AR, Maestre MJ, Espinosa F. Detect coastal disturbances and climate change effects in coralligenous community through sentinel stations Bianchi CNike. PLOS ONE [Internet]. 2020 ;15(5):e0231641. Available from: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0231641
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

This study was implemented to assess the Sessile Bioindicators in Permanent Quadrats (SBPQ) underwater environmental alert method. The SBPQ is a non-invasive and low-cost protocol; it uses sessile target species (indicators) to detect environmental alterations (natural or anthropic) at either the local or global (i.e., climate change) scale and the intrusion of invasive species. The SBPQ focuses on the monitoring of preselected sessile and sensitive benthic species associated with rocky coralligenous habitats using permanent quadrats in underwater sentinel stations. The selected target species have been well documented as bioindicators that disappear in the absence of environmental stability. However, whether these species are good indicators of stability or, in contrast, suffer variations in long-term coverage has not been verified. The purpose of this study was to assess the part of the method based on the hypothesis that, over a long temporal series in a highly structured and biodiverse coralligenous assemblage, the cover of sensitive sessile species does not change over time if the environmental stability characterising the habitat is not altered. Over a ten-year period (2005–2014), the sublittoral sessile biota in the Straits of Gibraltar Natural Park on the southern Iberian Peninsula was monitored at a 28 m-deep underwater sentinel stations. Analyses of the coverages of target indicator species (i.e., Paramuricea clavata and Astroides calycularis) together with other accompanying sessile organisms based on the periodic superimposition of gridded images from horizontal and vertical rocky surfaces allowed us to assess the effectiveness of the method. We conclude that no alterations occurred during the study period; only minimal fluctuations in cover were detected, and the method is reliable for detecting biological changes in ecosystems found in other geographical areas containing the chosen indicator species at similar dominance levels.

Enhancing the Scientific Value of Industry Remotely Operated Vehicles (ROVs) in Our Oceans

McLean DL, Parsons MJG, Gates AR, Benfield MC, Bond T, Booth DJ, Bunce M, Fowler AM, Harvey ES, Macreadie PI, et al. Enhancing the Scientific Value of Industry Remotely Operated Vehicles (ROVs) in Our Oceans. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00220/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Remotely operated vehicles (ROVs) are used extensively by the offshore oil and gas and renewables industries for inspection, maintenance, and repair of their infrastructure. With thousands of subsea structures monitored across the world’s oceans from the shallows to depths greater than 1,000 m, there is a great and underutilized opportunity for their scientific use. Through slight modifications of ROV operations, and by augmenting industry workclass ROVs with a range of scientific equipment, industry can fuel scientific discoveries, contribute to an understanding of the impact of artificial structures in our oceans, and collect biotic and abiotic data to support our understanding of how oceans and marine life are changing. Here, we identify and describe operationally feasible methods to adjust the way in which industry ROVs are operated to enhance the scientific value of data that they collect, without significantly impacting scheduling or adding to deployment costs. These include: rapid marine life survey protocols, imaging improvements, the addition of a range of scientific sensors, and collection of biological samples. By partnering with qualified and experienced research scientists, industry can improve the quality of their ROV-derived data, allowing the data to be analyzed robustly. Small changes by industry now could provide substantial benefits to scientific research in the long-term and improve the quality of scientific data in existence once the structures require decommissioning. Such changes also have the potential to enhance industry’s environmental stewardship by improving their environmental management and facilitating more informed engagement with a range of external stakeholders, including regulators and the public.

Underwater Visual Records of Marine Megafauna Around Offshore Anthropogenic Structures

Todd VLG, Lazar L, Williamson LD, Peters IT, Hoover AL, Cox SE, Todd IB, Macreadie PI, McLean DL. Underwater Visual Records of Marine Megafauna Around Offshore Anthropogenic Structures. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00230/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

In oceans and seas worldwide, an increasing number of end-of-life anthropogenic offshore structures (e.g., platforms, pipelines, manifolds, windfarms, etc.) are facing full or partial removal. As part of the decommissioning process, studies on potential importance of subsea infrastructure to marine megafauna (defined as: cetaceans, pinnipeds, sirenians, large fish – such as sharks, rays, billfishes, and tuna, as well as marine reptiles, and seabirds) are lacking. Dedicated scientific Remotely Operated Vehicle (ROV) surveys around offshore installations are rare, but there is a wealth of archived industrial data and noteworthy species sightings posted publicly on various social media platforms. This study used routine, incidentally collected ROV (n = 73) and commercial diver (n = 9) video recordings spanning 1998–2019 globally. Data were gathered directly from industrial partners (n = 36) and the public domain (YouTuben = 46) to provide an account of marine megafauna presence and potential feeding behavior in the near-visible vicinity of subsea anthropogenic structures. A total of 79 video clips and 3 still images of marine megafauna near offshore structures were examined, resulting in 67 individual sightings and 16 sub-sightings (in which an individual was recorded within the same day). At least 178 individuals were identified to a minimum of 17 species of marine megafauna, amounting to a total (combined) sighting duration of 01:09:35 (hh:mm:ss). Results demonstrated proximate presence of marine megafauna (many of which are threatened species) to anthropogenic structures, with most animals displaying foraging or interaction behaviors with the structures. Observations included the deepest (2,779 m) confirmed record of a sleeper shark (Somniosus spp.) and the first confirmed visual evidence of seals following pipelines. These ROV observations demonstrate a latent source of easily accessible information that can expand understanding of marine megafauna interactions with offshore anthropogenic infrastructure. Consequently, other workers in this field should be encouraged to re-analyze archived datasets, commence further collaborative research projects with industrial partners, and/or expand Internet search terms to additional species assemblages, in a bid to quantitatively elucidate relationships between offshore infrastructure and marine species.

Non-song Vocalizations of Humpback Whales in Western Australia

Recalde-Salas A, Erbe C, Kent CSalgado, Parsons M. Non-song Vocalizations of Humpback Whales in Western Australia. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00141/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

This study presents non-song vocalizations of humpback whales (Megaptera novaeangliae) from two migratory areas off the Western Australian coast: Geographe Bay and Port Hedland. A total of 220 sounds were identified as non-song sounds in 193 h of recordings reviewed. Of those, 68 were measured and qualitatively classified into 17 groups using their spectral features. One group (HW-02) had a high level of variation in terms of spectral slope. However, further classification using statistical classification methods was not possible because of the small sample size. Non-song sound frequencies varied from 9 Hz to 6 kHz, with the majority of sounds under 200 Hz. The duration of non-song sounds varied between 0.09 and 3.59 s. Overall, the use of spectral features allowed general classification of humpback whale sounds in a low sample size scenario that was not conducive to using quantitative methods. However, for highly variable groups, quantitative statistical classification methods (e.g., random forests) are needed to improve classification accuracy. The identification and accurate classification of a species’ acoustic repertoire is key to effectively monitor population status using acoustic techniques and to better understand the vocal behavior of the species. The results of this study improve the monitoring of humpback whales by standardizing the classification of sounds and including them in the species’ repertoire. The inclusion of non-song sounds in passive acoustic monitoring of humpback whales will add females and calves to the detection counts of otherwise only singing males.

Synergistic Effects of Ocean Warming and Cyanide Poisoning in an Ornamental Tropical Reef Fish

Madeira D, Andrade J, Leal MC, Ferreira V, Rocha RJM, Rosa R, Calado R. Synergistic Effects of Ocean Warming and Cyanide Poisoning in an Ornamental Tropical Reef Fish. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00246/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

An array of anthropogenic pressures is affecting tropical ecosystems, posing major conservation challenges for scientists, stakeholders and populations. Illegal cyanide fishing is one of the major threats to Indo-Pacific coral reefs, targeting a multitude of colorful species for the marine aquarium trade as well as large-sized groupers and wrasses for the food fish trade. Ultimately, the continued use of this destructive practice as oceans warm may overload tropical ecosystems and result in irreversible ecological damage. Here we show that the impact of cyanide poisoning in an ornamental tropical marine fish is magnified under increased temperatures. A sole pulse exposure of 60 s to 50 mg L–1 of cyanide under current temperature (26°C) caused substantial mortality (50–100%) in eight species of Pomacentridae. The clownfish Amphiprion ocellaris was the most resistant, especially medium-sized fish [average total length and weight of 38 mm and 1.12 g; LC50 (95% CI) = 50.00 (46.76 − 53.24) mg L–1] that showed shorter recovery times and higher survival rates (%) when compared to small-sized ones [average total length and weight of 25 mm and 0.30 g; LC50 (95% CI) = 28.45 (20.17 − 36.72) mg L–1]. However, when the most resistant size-class was concomitantly exposed to a sub-lethal dosage of cyanide (25 mg L–1 instead of 50 mg L–1) and ocean warming scenarios for 2100 (+3°C and heat wave +6°C), survival rates (%) decreased to 60 and 20%, respectively, and recovery times increased in the worst case scenario. Mortality outbreaks, as well as vulnerability to predation, will likely expand in fish inhabiting coral reefs exposed to cyanide fishing unless stronger conservation measures are taken in tropical reefs to limit this destructive practice now and in the oceans of tomorrow.

Distribution and Suitable Habitat of the Cold-Water Corals Lophelia pertusa, Paragorgia arborea, and Primnoa resedaeformis on the Norwegian Continental Shelf

Sundahl H, Buhl-Mortensen P, Buhl-Mortensen L. Distribution and Suitable Habitat of the Cold-Water Corals Lophelia pertusa, Paragorgia arborea, and Primnoa resedaeformis on the Norwegian Continental Shelf. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00213/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Cold-water corals are habitat-forming species that are also classified as indicators of vulnerable marine ecosystems (VMEs) due to the threat of various anthropogenic impacts, e.g., fisheries and oil/mineral exploration. To best protect VMEs, knowledge of their habitat requirements and distribution is essential. However, comprehensive sampling of the deep sea is difficult due to access and cost constraints, so species distribution modeling (SDM) is often used to predict overall distributions and ecological preferences of species based on limited data. We used Maximum Entropy (Maxent) modeling to predict the probability of presence of the reef-building scleractinian Lophelia pertusa and the octocorals Paragorgia arborea and Primnoa resedaeformis using a total of 2149 coral presence points and 15 environmental predictor variables. The environmental variables used in the analysis were processed to 176 m resolution and included bathymetry, depth, geomorphometric characteristics [slope, aspect, and bathymetric position index (BPI)], oceanography (temperature, salinity, current directions, and speed), surface chlorophyll a concentration, sediment type, and marine landscape type. Comparing presence points with environmental data showed that the temperature and depth range for Lophelia was narrower compared to the gorgonians, and it occurred in shallower, warmer water. Observations showed that Lophelia had a broad, bimodal response to Broad BPI, while the predicted model indicated a more narrow response. Paragorgia tolerated the greatest range of sloping according to the model. All three species were observed with a bimodal pattern along a wide range of mean current speed, while the models indicated a high response to faster current speed. Jackknife tests showed that sediment type was an important predictor for gorgonian corals, while BPI and minimum temperature were more important for Lophelia. The spatial precision of the models could be further increased by applying environmental layers with a higher and uniform spatial resolution. The predicted distribution of corals and their relation to environmental variables provides an important background for prioritizing areas for detailed mapping surveys and will aid in the conservation efforts for these VMEs in Norwegian waters and beyond.

Restore or Redefine: Future Trajectories for Restoration

Coleman MAnn, Wood G, Filbee-Dexter K, Minne AJP, Goold HDouglas, Vergés A, Marzinelli EMiguel, Steinberg PDavid, Wernberg T. Restore or Redefine: Future Trajectories for Restoration. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00237/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Global habitat deterioration of marine ecosystems has led to a need for active interventions to halt or reverse the loss of ecological function. Restoration has historically been a key tool to reverse habitat loss and restore functions, but the extent to which this will be sufficient under future climates is uncertain. Emerging genetic technologies now provide the ability for restoration to proactively match adaptability of target species to predicted future environmental conditions, which opens up the possibility of boosting resistance to future stress in degraded and threatened habitats. As such, the choice of whether to restore to historical baselines or anticipate the future remains a key decision that will influence restoration success in the face of environmental and climate change. Here, we present an overview of the different motives for restoration – to recover or revive lost or degraded habitats to extant or historical states, or to reinforce or redefine for future conditions. We focus on the genetic and adaptive choices that underpin each option and subsequent consequences for restoration success. These options span a range of possible trajectories, technological advances and societal acceptability, and represent a framework for progressing restoration of marine habitat forming species into the future.

The Economic Value of Shark and Ray Tourism in Indonesia and Its Role in Delivering Conservation Outcomes

Mustika PLiza Kusum, Ichsan M, Booth H. The Economic Value of Shark and Ray Tourism in Indonesia and Its Role in Delivering Conservation Outcomes. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00261/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

As a hotspot of species diversity and fishing pressure, Indonesia is a global priority for the conservation of sharks, rays and their cartilaginous relatives (herein “sharks”). The high value marine tourism industry in Indonesia can create economic incentives for protecting and sustainably managing marine ecosystems and species, including sharks. This study estimates the economic value of shark and ray tourism in Indonesia and explores tourist preferences and local community perceptions of the tourism industry to understand the current and potential future role of this industry in shark and ray conservation. We identified 24 shark tourism hotspots across 14 provinces, with primary data collected from 365 tourists and 84 local community members over six case study sites. We use Purchasing Power Parity (PPP) and travel efforts to extrapolate expenditures to other tourism sites. We estimate that at least 188,931 dedicated or partially dedicated shark tourists visit Indonesia each year. The median annual expenditures of these shark tourists is estimated at USD 22 million (for 2017), accounting for at least 7% of the total USD 1 billion marine tourism revenue in Indonesia in 2017 and 1.45× the value of annual shark exports in the country (inflation-adjusted to 2017 values). If sharks were absent from the surveyed sites, Indonesia’s tourism industry could lose ∼25% of these dive tourist expenditures. Despite this considerable value, our study indicates a mismatch between the absolute economic value of shark and ray tourism and its role in providing an incentive for conservation. Results from interviews with local communities in or near shark and ray tourism sites indicate that shark fishers are not well placed to receive direct economic benefits from shark and ray tourism. Since overfishing is the primary threat to shark populations, failure to engage with and appropriately incentivize these stakeholders will be detrimental to the success of Indonesia’s shark conservation efforts. If shark populations continue to decline due to insufficient conservation actions, the tourism industry could suffer economic losses from shark and ray tourism of more than USD 121 million per annum by 2027, as well as detrimental impacts on species, marine ecosystems, fisheries and people.

Options to Improve Transparency of Environmental Monitoring Governance for Polymetallic Nodule Mining in the Area

Komaki K, Fluharty D. Options to Improve Transparency of Environmental Monitoring Governance for Polymetallic Nodule Mining in the Area. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00247/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

This paper proposes institutional innovations to advance a transparent monitoring system for the environmental impacts from mineral development on the deep seabed beyond national jurisdictions managed by the International Seabed Authority (ISA). Using a literature review, ISA’s regulations, and five cases of other environmental monitoring of the deep sea, this study observes that ISA’s environmental monitoring system for exploration and exploitation currently lacks critical elements to facilitate transparency. Insufficient compliance reporting and review systems, as well as limited access to information by stakeholders, lower the system’s effectiveness. ISA has not developed adequate mechanisms to support effective multinational collaboration in monitoring. The ISA monitoring system without these characteristics may not be sufficiently adaptive to allow detection and management of environmental changes in the deep seabed. This study suggests 15 institutional recommendations to ISA in order to enhance transparency for monitoring nodule mining in the Central Pacific deep seabed. Principal recommendations include establishing compliance review committees independent of ISA governing bodies, implementing collective monitoring and reporting by adjacent contractors, and reconsidering the centralized decision-making authority by the Secretary-General to improve confidentiality.

Home for Marine Species: Seagrass Leaves as Vital Spawning Grounds and Food Source

Jiang Z, Huang D, Fang Y, Cui L, Zhao C, Liu S, Wu Y, Chen Q, Ranvilage CIsuranga P, He J, et al. Home for Marine Species: Seagrass Leaves as Vital Spawning Grounds and Food Source. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00194/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Seagrass beds provide nursery habitats for marine species. Seagrass leaves, in particular, are used as spawning grounds and as a food source for fish and invertebrates, but direct evidence of spawning in seagrass leaves is rare. It is also very challenging to identify eggs through morphological analysis, since the eggs of many marine species appear similar. To accurately identify the eggs on the leaves of the dominant seagrass species in the South China Sea, and evaluate seasonal contribution of seagrass leaves as a food source, DNA barcoding and stable isotope technique were conducted. Interestingly, Monetaria annulus was found to spawn on the leaf sheath of Thalassia hemprichii in Li’an gang, Hainan Island. This choice of oviposition site might increase embryo survival compared to the other parts of the seagrass leaves. Meanwhile, the eggs of Stethojulis trilineata were deposited on the entire leaf of Halophila ovalis in Liusha Bay, Guangdong Province. The small fingernail-shaped leaves of H. ovalis might be beneficial for S. trilineata to lay eggs as they are closer to the sediment surface than other seagrass leaves. Based on the stable carbon and nitrogen isotope analyses, the primary food source of M. annulus in summer and in winter were particulate organic matter and seagrass, respectively. The results suggest that seagrass leaves are not only important for fish and invertebrates as a spawning site, but also as a food source. The findings of the present study may support the urgent requirement of the conservation of seagrass beds for sustaining the productivity of marine fisheries.

The Use of Recreational Fishers’ Ecological Knowledge to Assess the Conservation Status of Marine Ecosystems

Pita P, Antelo M, Hyder K, Vingada J, Villasante S. The Use of Recreational Fishers’ Ecological Knowledge to Assess the Conservation Status of Marine Ecosystems. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00242/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

There is a reluctance to incorporate Fishers’ Ecological Knowledge (FEK) into the evidence base used to underpin marine management decisions. FEK has proved to be useful as an alternative reference of biological changes in data-poor scenarios. Yet, recreational fisher knowledge has rarely been included in scientific studies despite being a source of FEK. Here, the use of recreational FEK to assess the conservation status of marine ecosystems in Galicia (NW Spain) was evaluated. Galicia has a highly complex marine socioecological system that includes both a large global commercial fleet and a powerful recreational sector, alongside other important stakeholders (e.g., tourism, aquaculture). Anglers and spear fishers were asked to provide their perceptions of the conservation status of fish stocks and the impacts on marine ecosystems. Face-to-face interviews were transcribed into text and analyzed using text mining tools. Key concepts were used to quantify fishers’ perceptions of changes in their target fish stocks and quantify the main impacts on marine ecosystems. Overfishing and habitat loss, followed by reduction in biodiversity, pollution, and warming temperatures were considered to be the main drivers of the poor status of cephalopods and finfish stocks. Perceived temporal declines in fish stocks were consistent with available biological data, highlighting the potential for recreational FEK to be used to assess long-term ecological changes. It was important to seek opinions from different users, including fishers from traditional commercial and recreational fisheries, as these groups had good knowledge of the impacts on natural and cultural community heritage. The poor status of ballan wrasse (Labrus bergylta) and kelp beds was identified, which was of concern due to it being a key species in coastal ecosystems. Use of FEK is a good approach to develop knowledge of these systems, but broader monitoring programs are needed to protect the future of these ecosystems.

Spatial Management Units as an Ecosystem-Based Approach for Managing Bottom-Towed Fisheries in the Central Mediterranean Sea

Lauria V, Gristina M, Fiorentino F, Attrill MJ, Garofalo G. Spatial Management Units as an Ecosystem-Based Approach for Managing Bottom-Towed Fisheries in the Central Mediterranean Sea. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00233/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Marine ecosystems are being continually impacted by human activities and, among these, fisheries have been one of the most damaging. Fisheries modify the structure and functioning of food-webs through biomass removal and physical damage to the seabed, leading to loss of biodiversity and ecosystem services provided by the oceans. The ecosystem-based approach to fisheries is considered the most efficient way to achieve the goal of sustainable use of marine resources while allowing for biodiversity protection. The Strait of Sicily is a biologically important area of the central Mediterranean Sea characterized by high habitat complexity and rich biodiversity, however, due to the multispecific nature of local fisheries and weak implementation of the adopted management plans, this region is particularly vulnerable. We used fishery independent time series (1994–2016) to identify the main demersal assemblages and map their spatial distribution. The pressure of fishing effort on each of these defined assemblages was then quantified in order to evaluate the impact of bottom trawling on demersal communities. Our results showed four spatially distinct and temporally stable assemblages of the Strait of Sicily. These have a clear spatial distribution, different species composition and biodiversity values and are driven primarily by environmental gradients (i.e., mainly depth and, to a lesser extent, surface salinity). The demersal assemblages were subsequently grouped in homogeneous areas characterized by specific communities of commercial and non-commercial species and response to trawling impacts. These areas are proposed as Spatial Managements Units to evaluate and manage demersal mixed fisheries, while also considering biodiversity conservation in the central Mediterranean Sea.

Impacts of Marine and Lagoon Aquaculture on Macrophytes in Mediterranean Benthic Ecosystems

Boudouresque C-F, Blanfuné A, Pergent G, Pergent-Martini C, Perret-Boudouresque M, Thibaut T. Impacts of Marine and Lagoon Aquaculture on Macrophytes in Mediterranean Benthic Ecosystems. Frontiers in Marine Science [Internet]. 2020 ;7. Available from: https://www.frontiersin.org/articles/10.3389/fmars.2020.00218/full?utm_source=F-AAE&utm_medium=EMLF&utm_campaign=MRK_1320398_45_Marine_20200505_arts_A
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

The direct and indirect impact of fish farms, shellfish aquaculture, and extensive forms of aquaculture such as seeding of juvenile sea urchins, on macrophytes (seaweeds and seagrasses), is reviewed in Mediterranean benthic ecosystems. Fish farms constitute a source of organic matter and nutrients (food and fecal pellets) that causes the extirpation of Posidonia oceanica seagrass meadows beneath and near to farm facilities. In addition to direct effects, the nitrogen enrichment of macrophytes tissues increases the grazing pressure by herbivorous fishes and sea urchins. In some cases, the impact can continue to increase several years after the cessation of farming activities. Natural restoration of extirpated seagrass meadows is generally unlikely at the human time scale. Shellfish aquaculture is the cause of the main flow of introduced macrophytes in the Mediterranean; the main vector is the importation of oyster spat from Japan and Korea. North-eastern Pacific seaweeds are now the dominant biotic component of some Mediterranean lagoons (e.g., Thau, Mar Piccolo, and Venice lagoons). In addition to direct effects, mussel aquaculture can constitute a source of larvae that flow with currents, the adults of which can overwhelm seaweed forests (e.g., Carpodesmia mediterranea). Shellfish aquaculture is also a source of fecal pellets, resulting in changes in bottom macrophytes, and a vector of diseases of metazoans, the extirpation of which may change the functioning of recipient macrophyte ecosystems. The edible sea urchin Paracentrotus lividus is sometimes erroneously considered as in decline due to over-harvesting. However, its abundance in the second half of the 20th century was probably a consequence of human impact (overfishing of its predatory fish, organic pollution. This man-induced proliferation resulted in the extirpation of seaweed forests (e.g., Carpodesmia spp., Treptacantha spp. – formerly Cystoseira spp. – Sargassum spp.; many species are endemic), which play a key role in Mediterranean coastal ecosystems. Therefore, the attempts to restore sea urchin abundance, via seeding of juveniles from hatcheries, has further artificialized the habitats rather than contributing to the restoration of natural ecosystems. Good practices guidelines are proposed aimed at minimizing the impact of aquaculture on macrophytes.

Survivorship and growth in staghorn coral (Acropora cervicornis) outplanting projects in the Florida Keys National Marine Sanctuary

Ware M, Garfield EN, Nedimyer K, Levy J, Kaufman L, Precht W, R. Winters S, Miller SL. Survivorship and growth in staghorn coral (Acropora cervicornis) outplanting projects in the Florida Keys National Marine Sanctuary Lipcius RN. PLOS ONE [Internet]. 2020 ;15(5):e0231817. Available from: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0231817
Freely available?: 
Yes
Summary available?: 
No
Type: Journal Article

Significant population declines in Acropora cervicornis and Apalmata began in the 1970s and now exceed over 90%. The losses were caused by a combination of coral disease and bleaching, with possible contributions from other stressors, including pollution and predation. Reproduction in the wild by fragment regeneration and sexual recruitment is inadequate to offset population declines. Starting in 2007, the Coral Restoration Foundation evaluated the feasibility of outplanting Acervicornis colonies to reefs in the Florida Keys to restore populations at sites where the species was previously abundant. Reported here are the results of 20 coral outplanting projects with each project defined as a cohort of colonies outplanted at the same time and location. Photogrammetric analysis and in situ monitoring (2007 to 2015) measured survivorship, growth, and condition of 2419 colonies. Survivorship was initially high but generally decreased after two years. Survivorship among projects based on colony counts ranged from 4% to 89% for seven cohorts monitored at least five years. Weibull survival models were used to estimate survivorship beyond the duration of the projects and ranged from approximately 0% to over 35% after five years and 0% to 10% after seven years. Growth rate averaged 10 cm/year during the first two years then plateaued in subsequent years. After four years, approximately one-third of surviving colonies were ≥ 50 cm in maximum diameter. Projects used three to sixteen different genotypes and significant differences did not occur in survivorship, condition, or growth. Restoration times for three reefs were calculated based on NOAA Recovery Plan (NRP) metrics (colony abundance and size) and the findings from projects reported here. Results support NRP conclusions that reducing stressors is required before significant population growth and recovery will occur. Until then, outplanting protects against local extinction and helps to maintain genetic diversity in the wild.

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