[MARMAM] New publication on dolphins mixed-species associations in Brazil

Renan Lima renancdl at gmail.com
Thu Jan 14 17:37:02 PST 2021


On behalf of my co-authors, I am pleased to announce the publication of our
new research article on the current issue of Aquatic Mammals:

Lima, RC, Di Tullio JC, Secchi ER, Castro FR, and Troina, GC.  Delphinid
mixed-species associations in the oceanic waters of the Western South
Atlantic.
https://doi.org/10.1578/AM.47.1.2021.53

Abstract
Dolphins are highly social animals usually reported in large groups
comprised of individuals of a single species, although they are often
reported associating with other species as well. The drivers for the
formation of these mixed-species associations (MSAs) are poorly understood,
and records in Brazilian waters are scarce. To better understand their
occurrence in the region, we assessed seasonal and spatial distribution of
MSAs in waters over the outer continental shelf and slope off Brazil (22 to
33° S). Data were collected during spring and autumn between 2009 and 2014.
>From a total of 187 Delphinidae sightings, 28 consisted of MSAs. Tursiops
truncatus was the most frequently sighted species in an MSA (n = 22
sightings) and was mostly found in lower numbers than its associated
counterparts: Globicephala melas, Stenella frontalis, Grampus griseus, and
Pseudorca crassidens. MSAs between Stenella attenuata and Stenella
longirostris or Delphinus delphis and S. frontalis were also reported. Our
data did not show any seasonal or spatial trends in overall MSA frequency;
nevertheless, the widely distributed T. truncatus appears to shift its
associates according to their local abundance (e.g., associating with G.
melas in the southern region of the study area and with S. frontalis in the
southeastern region). Although a lot remains to be investigated regarding
the ecological drivers for such associations between sympatric dolphins in
Brazilian waters, this was the first effort to describe their occurrence
and distribution patterns using cetacean dedicated surveys.

The article is available at
https://www.aquaticmammalsjournal.org/index.php?option=com_content&view=article&id=2114:delphinid-mixed-species-associations-in-the-oceanic-waters-of-the-western-south-atlantic&catid=199&Itemid=326

Please feel free to contact me via email (renancdl at gmail.com) for any
questions or a pdf copy of the paper.

Best regards,
Renan Lima


-- 
MSc Renan Costa de Lima
Doutorando do Programa de Pós-Graduação em Oceanografia Biológica
Laboratório de Ecologia e Conservação da Megafauna Marinha - EcoMega
Instituto de Oceanografia
Universidade Federal do Rio Grande (FURG)
Fone: +55(53)99718994
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