[MARMAM] New publication: Common dolphin (Delphinus delphis) fission–fusion dynamics in the south coast of Portugal

Joana Castro jmadeiracastro at gmail.com
Mon Aug 29 05:22:53 PDT 2022


 Dear all,

My co-authors and I are pleased to announce and share our recent paper
titled
*Common dolphin (Delphinus delphis) fission–fusion dynamics in the south
coast of Portugal *


* Castro, J., Faustino, C., Cid, A., Quirin, A., Matos, F.L., Rosa, R.,
Pearson, C.H. Common dolphin (Delphinus delphis) fission–fusion dynamics in
the south coast of Portugal. Behav Ecol Sociobiol 76, 128 (2022).
https://doi.org/10.1007/s00265-022-03235-0
<https://doi.org/10.1007/s00265-022-03235-0>*


Abstract:

Animals with fission–fusion dynamics live in fluid societies with varying
party sizes. The joining (fusion) and separation (fission) of these parties
is considered a response to costs and benefits associated with grouping.
This study investigates which factors influence grouping and fission–fusion
dynamics in common dolphins (Delphinus delphis) in Portugal. Between June
and October of 2016 and 2017, 94 boat-based group focal follows were
conducted, resulting in 2410, 2-min behavioral samples. Using generalized
linear models, we examined how mother-calf pair presence, behavioral state,
and temporal variability influence party size. We used generalized
estimating equations to model behavior and fission–fusion dynamics, testing
the responses to mother-calf presence and time. Parties were smaller when
mother-calf pairs were absent or when animals were resting. Socializing
parties without mother-calf pairs were more likely to be observed than
traveling parties with mother-calf pairs. Compared to traveling, foraging
was less likely in September and October than in June, and resting was more
likely in September. Compared to stable state, parties without mother-calf
pairs were more likely to fission than parties with mother-calf pairs and
fusion events became less likely by advancing hour. We revealed that common
dolphins in Southern Portugal exhibit a high degree of fission–fusion
dynamics that are predominantly influenced by mother-calf presence,
confirming the importance of this region as a nursery ground. By assessing
fine-scale social dynamics in common dolphins, this study advances
understanding of the evolutionary drivers shaping grouping patterns in wild
cetaceans while also providing an important comparative counterpoint to
terrestrial fission–fusion dynamic.

The full paper is available here:
<https://www.mdpi.com/2072-4292/13/1/156/htm>https://rdcu.be/cUtQ5

Please contact jmadeiracastro at gmail.com if you would like a copy of the
manuscript or if you have any questions.

Best regards

Joana Castro
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