Dear MARMAM community
On behalf of my co-authors, I am pleased to share our manuscrit titled "Escape
response of Guiana dolphins to bottlenose dolphin playback".
Links to access and download the paper:-
https://authors.elsevier.com/a/1hMwz51aUnOi0-
https://doi.org/10.1016/j.jembe.2023.151925
AbstractAn individual reaction to natural threats, such as the presence of
predators or aggressors, can shape the social behaviour of an entire
population. In southern Brazil, two coastal Delphinid species, Guiana dolphin
(Sotalia guianensis) and Lahille's bottlenose dolphin (Tursiops truncatus
gephyreus) co-occur on a regional scale. However, within Baía Norte, there is a
clear spatial segregation between these dolphins at a fine-scale that, combined
with records of bottlenose dolphins displaying agonistic behaviours towards
Guiana dolphins, raised the hypothesis that such aggressive behaviours may
contribute to shape this segregated distribution. Here, to investigate this
hypothesis, we carried out a controlled exposure experiment in which surface
behavioural responses of Guiana dolphins were evaluated before, during and
after acoustic playbacks of bottlenose dolphins. Through aerial footages,
collected with an unmanned aerial vehicle, we accessed significant behavioural
responses of Guiana dolphins in terms of group organization and behavioural
states. During playbacks, we observed a decrease in the cohesion index between
individual Guiana dolphins and an increase in group synchrony, indicating that
individuals coordinate their movements to aggregate when exposed to playback.
In addition, time spent in foraging behaviours decreased significantly during
playbacks, suggesting that foraging activities are interrupted, and individuals
start to travel. These results demonstrate that Guiana dolphins perform a
collective escape behaviour when facing bottlenose dolphins, a potential
aggressor, reinforcing the hypothesis that such defensive behaviour is
mediating the spatial segregation between these dolphins' populations.
We hope you enjoy the reading. Please feel free to contact me to request a PDF
version or for any question or comment regarding our work at:
juliapie...@yahoo.com.br
Best wishes.
Julia Cavalli Pierry PhD Student Universidade Federal do Paraná, Brasil.
_______________________________________________
MARMAM mailing list
MARMAM@lists.uvic.ca
https://lists.uvic.ca/mailman/listinfo/marmam
