For the week of 05 March 2018
Greetings OpenChannels Community Members,
Scientific Reports has published, Assessing cetacean surveys throughout the Mediterranean Sea: a gap analysis in environmental space. "Heterogeneous data collection in the marine environment has led to large gaps in our knowledge of marine species distributions. To fill these gaps, models calibrated on existing data may be used to predict species distributions in unsampled areas, given that available data are sufficiently representative. Our objective was to evaluate the feasibility of mapping cetacean densities across the entire Mediterranean Sea using models calibrated on available survey data and various environmental covariates. We aggregated 302,481 km of line transect survey effort conducted in the Mediterranean Sea within the past 20 years by many organisations. Survey coverage was highly heterogeneous geographically and seasonally: large data gaps were present in the eastern and southern Mediterranean and in non-summer months. We mapped the extent of interpolation versus extrapolation and the proportion of data nearby in environmental space when models calibrated on existing survey data were used for prediction across the entire Mediterranean Sea. Using model predictions to map cetacean densities in the eastern and southern Mediterranean, characterised by warmer, less productive waters, and more intense eddy activity, would lead to potentially unreliable extrapolations. We stress the need for systematic surveys of cetaceans in these environmentally unique Mediterranean waters, particularly in non-summer months."
As always, if we've missed anything, please feel free to let us know. You may simply reply to this message, or you may email Allie directly at abrown [at] openchannels.org (.)
You can read everything (not just the free stuff) we have found this week at https://www.openchannels.org/literature-update/2018-03-07. Additionally, you can browse literature by the week we've added it at https://www.openchannels.org/literature-by-week.
-Allie Brown and Raye Evrard