Distribution of the acoustic occurrence of dolphins during the summers 2011 to 2015 in the Upper Gulf of California, Mexico

PeerJ
Gustavo Cárdenas HinojosaArmando Jaramillo-Legorreta

Abstract

Baseline knowledge of spatial and temporal distribution patterns is essential for cetacean management and conservation. Such knowledge is particularly important in areas where gillnet fishing occurs, as the Upper Gulf of California, which increases the probability of bycatch of cetaceans. In this area, the vaquita porpoise (Phocoena sinus) has been widely studied, but the knowledge of other cetaceans is scarce and based on traditional visual survey methods. We used data collected by an array of acoustic click detectors (C-PODs) during the summers 2011 to 2015 to analyze the distribution of dolphins in the Vaquita Refuge in the Upper Gulf of California. We recorded 120,038 echolocation click trains of dolphins during 12,371 days of recording effort at 46 sampling sites. Based on simultaneous visual and acoustic data, we estimated a false positive acoustic detection rate of 19.4%. Dolphin acoustic activity varied among sites, with higher activity in the east of the Vaquita Refuge. Acoustic activity was higher at night than during the day. We used negative binomial generalized linear models to study the count of clicks of dolphins in relation to spatial, temporal, physical, biological and anthropogenic explanatory variables. The b...Continue Reading

References

Jan 28, 2012·The Journal of the Acoustical Society of America·Line A KyhnJonas Teilmann
Jun 8, 2013·The Journal of the Acoustical Society of America·Sean M WigginsJohn A Hildebrand
Aug 24, 2013·The Journal of the Acoustical Society of America·Hanna K NuuttilaPeter G H Evans
Jun 25, 2016·Conservation Biology : the Journal of the Society for Conservation Biology·Armando Jaramillo-LegorretaBarbara Taylor
Sep 3, 2017·The Journal of the Acoustical Society of America·K J PalmerLuke Rendell
Dec 4, 2017·The Journal of the Acoustical Society of America·Len ThomasNicholas Tregenza
Aug 17, 2019·Royal Society Open Science·Armando M Jaramillo-LegorretaNicholas Tregenza

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