On behalf of my co-authors, I am pleased to announce the publication of our research article "Statistical dependence for detecting whale-watching effects on humpback whales".
Garcia-Cegarra, A.M., Villagra, D., Gallardo, D.I., Pacheco, A.S. Statistical dependence for detecting whale-watching effects on humpback whales. Journal of Wildlife Management. DOI: 10.1002/jwmg.21602. Abstract Whale-watching is one of the fastest growing ecotourism industries and involves the observation of endangered wild cetacean species. However, this growth has raised concerns because of the negative effects this activity may have on the behavior and survival of focal species. Hence, detecting the effects of this activity requires sensitive analytical methods allowing the implementation of regulations to protect cetacean welfare. We compared the performance of different hypothesis tests from classical and Bayesian approaches to detect whale-watching effects on humpback whale (Megaptera novaeangliae) behavior. From a cliff located 31 m above sea level in northern Peru, we measured breathing frequency, surface time, long dive duration, directness index (i.e., path linearity), and swimming speed of humpback whales before, during, and after encounters with whale-watching boats. During 167 hours of observation, we tracked 180 humpback whale groups; 43% of groups had calves and 57% did not. Inference by null-hypothesis testing indicated significant changes only in directness index after boat encounters in groups with a calf. Other methods of inference detected moderate behavior responses as increments in the number of adult breaths, swimming speed, and dive intervals for adults and calves. Whale-watching regulations must be implemented in Peru to regulate number of boats, distance to whales, approximate speed, and time observing humpback whales. Whale-watching of humpback whales with calves should be avoided. You can find a copy of the research article in: https://www.researchgate.net/publication/329276806_Statstical_Dependence_for_Detecting_Whale-Watching_Effects_on_Humpback_Whales Or you can email me for a pdf copy, queries or comments: anamaria.gar...@uantof.cl Best regards, Ana PHD candidate Ana M. Garcia-Cegarra, AQUATOX Laboratory - Facultad Ciencias del Mar y Recuersos Biológicos Campus Coloso Universidad de Antofagasta, Chile. CEL: +56981282252 *Ana M. García Cegarra* *Doctorado Ciencias Aplicadas mención Sistemas Marinos Costeros* *Facultad de Ciencias del Mar y Recursos Biológicos* *Universidad de Antofagasta, Chile* *Angamos 601* *P.O. Box 170* *TL: +569 81282252 / +34 669592330* *Web: http://www.cienciasaplicadasmsmc.com/sitio/ <http://www.cienciasaplicadasmsmc.com/sitio/> *
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