[MARMAM] New paper on Guiana dolphin feeding behavior

Rodrigo Tardin rhtardin at gmail.com
Thu Aug 4 08:48:31 PDT 2011


the following paper has been published on ZOOLOGIA and can be
downloaded from the following web page:


or you can contact me for a pdf copy.


Rodrigo Tardin

Rodrigo H. O. Tardin; Mariana A. Especie; Mariana F. Nery; Felipe T.
D’Azeredo & Sheila M. Simão. Coordinated feeding tactics of the Guiana
dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Ilha Grande
Bay, Rio de Janeiro, Brazil. Zoologia (Curitiba, Impr.) [online].
2011, vol.28, n.3, pp. 291-296. ISSN 1984-4670.

Differences in distribution, prey species, season and social learning
opportunities influence the feeding tactics used by marine mammals.
Here, we analyze the coordinated feeding behavior of the Guiana
dolphin, Sotalia guianensis (Van Bénéden, 1864, Delphinidae) and its
relation to seasonality and the presence of calves. In a total of 201
feeding bouts, we observed four types of coordinated feeding tactics,
which differed in frequency and in mean number of engaged individuals.
Tactics in which dolphins used their bodies to herd and capture prey
were the most frequent, presenting a higher frequency and engaging a
higher number of individuals, suggesting that these tactics are better
for capturing fishes which form larger schools. Furthermore, the
seasons influenced the feeding behavior used by dolphins. During
spring-summer, a longer duration of bouts and a larger number of
individuals engaged in the feeding tactics was observed, which may be
related to the seasonal spawning of larger schooling fish, such as
Sardinella brasiliensis (Steindachner, 1879). Calves were present in
95% of all coordinated feeding tactic occurrences. This study
indicates a complete preference of dolphins for coordinating their
actions to capture prey and for the first time reports the presence of
calves in the coordinated tactics and jumps. This broadens the current
knowledge of the Guiana dolphin feeding tactics.
Rodrigo Tardin

Doutorando em Ecologia e Conservação - IBRAG - UERJ
Mestre em Biologia Animal - PPGBA - UFRRJ
Especialista em Docência do Ensino Superior - IAVM
Laboratório de Bioacústica e Ecologia de Cetáceos - UFRRJ/ IF/ DCA

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