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Occurrence of Guiana dolphin ( Sotalia guianensis ) in southeast of Brazil: Driven by prey distribution or human fishing activity?
Author(s) -
Ferro de Godoy Daniela,
Mendonça Jocemar Tomasino,
Andriolo Artur
Publication year - 2020
Publication title -
aquatic conservation: marine and freshwater ecosystems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 77
eISSN - 1099-0755
pISSN - 1052-7613
DOI - 10.1002/aqc.3367
Subject(s) - mugil , fishery , estuary , fishing , predation , mullet , geography , fish <actinopterygii> , biology , ecology
This study used models to assess how the type of prey caught by artisanal fishermen influenced the occurrence of Guiana dolphins ( Sotalia guianensis ) in the region of the estuarine lagunar comple.x of Cananéia (São Paulo, Brazil). The data were collected from January 2012 to November 2014, during three fieldwork expeditions per season (spring, summer, autumn, winter). Mullets ( Mugil liza ) were the fish with the highest association to dolphins, followed by Oligoplites spp. and Lobotes spp.; Mugil curema and shrimp, on the other hand, negatively influenced their distribution. The presence of fish‐weir fisheries in the estuary also had a positive influence on the occurrence of dolphins, since this fishing gear is used as a barrier, minimizing the potential for their prey to escape.