Physical and biological drivers of pelagic fish distribution at high spatial resolution in two Patagonian Gulfs
- Luzenti, Elvio Agustín
- Svendsen, Guillermo
- Degrati, Mariana
- Curcio, Nadia Soledad
- González, Raul Alberto Candido
- Dans, Silvana Laura
DOIAbstract
The North Patagonian gulfs, Argentina, support an important population of small pelagic fish (SPF) that play a key role in the marine ecosystem. Here, we assessed the seasonal SPF distribution in Nuevo gulf and San Matías Gulf concerning several environmental variables and the nautical area scattering coefficient (NASC) of Munida gregaria using generalized additive models (GAMs). We collected biological data by a 38/200 kHz echosounder along zigzag transects in all four seasons. The echoes of fish were separated from other targets using a dB difference algorithm. Then, we calculated the mean NASC of pelagic fishes every 0.5 nm. Satellite-derived data were used to characterize the environment at study sites. GAMs were built in two stages for...
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