[MARMAM] New publication on whale-watching effects on humpback whales behavior in Northern Peru breeding area (Ana Garcia)

Ana M Garcia Cegarra albatracu at gmail.com
Mon Dec 10 01:29:46 PST 2018

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.


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

You can find a copy of the research article in:

Or you can email me for a pdf copy, queries or comments:
anamaria.garcia at uantof.cl

Best regards,


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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