Bathymetric distribution of demersal fish in the Aegean and Ionian Seas based on generalized additive modeling |
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Authors: | Stelios Katsanevakis Christos D Maravelias |
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Institution: | (1) Institute of Marine Biological Resources, Hellenic Centre for Marine Research (HCMR), 46.7 km Athens-Sounio, P.O. Box 712, 19013 Anavissos, Attica, Greece |
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Abstract: | Good knowledge of the spatial distribution of fish is critical to stock assessment and successful fisheries management. Depth
is often the main gradient along which faunal changes occur when analyzing shelf and upper slope assemblages, and thus knowledge
of the bathymetric distribution of fish species is of great importance. The depth distribution of 16 fish species (Chelidonichthys lucernus, Helicolenus dactylopterus, Hoplostethus mediterraneus, Lepidorhombus boscii, Lophius budegassa, Merlangius merlangus, Merluccius merluccius, Micromesistius poutassou, Mullus barbatus, Mullus surmuletus, Pagellus erythrinus, Peristedion cataphractum, Phycis blennoides, Serranus cabrilla, Trigla lyra, and Trisopterus minutus) of the Aegean and the Ionian Seas was evaluated by analyzing experimental bottom trawl data, using generalized additive
modeling (GAM) techniques. A variety of bathymetric distribution patterns was observed. The main bathymetric zone of each
species was defined based on the modeled relative density. Specifically, the lower and upper limits of the main bathymetric
zone of each species were defined as the depths where the estimated relative density of the species becomes less than 1% of
the maximum. This definition is proposed as a better and more informative alternative than reporting the minimum and maximum
depths of encounter. |
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Keywords: | Bathymetric distribution Depth Demersal fish GAM Mediterranean Sea |
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