[MARMAM] New manuscript on feeding habits of Guiana dolphins

Marcos Santos sotalia at gmail.com
Fri Nov 9 08:16:21 PST 2012

Dear Marmamers: a new scientific contribution on Guiana dolphins is available
(abstract below).
Now, we present new food items and a knowledge review regarding Sotalia
guianensis in southeastern Brazil.
As you will find in the Ackowledgements, this manuscriopt was dedicated to
the memory of Dr Nelio Barros, who left an important contribution to the
knowledge about cetacean trophic interactions.

Lopes, X.M.; da Silva, E.; Bassoi, M.; dos Santos, R.A.; and Santos, M.C.
de O. 2012. Feeding habits of Guiana dolphins, Sotalia guianensis, from
southeastern Brazil: new items and a knowledge review. Journal of the
Marine Biological Association of the United Kingdom, 92: 1723-1733.

Abstract: This study presents new information on feeding habits of Guiana
dolphins, Sotalia guianensis, in south-eastern Brazil,
together with new regression equations to evaluate the weight and length of
fish from otoliths, showing an overview on
the knowledge about this species’ diet in this area. Eighteen stomach
contents had been analysed and compared to 180
samples collected in another eight feeding studies. The analysed specimens
were either incidentally caught in gillnets used
in coastal waters by the fleet based in the Cananeia main harbour (25o00 S
47o55 W), south of Sao Paulo State, or found
dead in inner waters of the Cananeia estuary between 2003 and 2009. Based
on the index of relative importance analysis,
the most important fish species were the banded croaker, Paralonchurus
brasiliensis. Doryteuthis plei was the most representative
cephalopod species. Stellifer rastrifer was the most important fish species
observed in dolphins in inner estuarine
waters and P. brasiliensis in recovered dolphins from coastal waters.
Loliguncula brevis is the only cephalopod species
reported from dolphins found in inner estuarine waters up to date.
Doryteuthis plei was the most important cephalopod
species observed in coastal dolphins. When considering other feeding
studies, the most representative fish family in the
diet of S. guianensis was Sciaenidae, which is mainly represented by
demersal fishes. The main preys of S. guianensis are
abundant in the studied areas, which may indicate an opportunistic feeding
habit. The majority of them are not the most
important target species by the commercial fishery in south-eastern Brazil.

Pdf file available at: sotalia at gmail.com

Marcos Santos
Dr. Marcos Cesar de Oliveira Santos
Laboratorio de Biologia da Conservacao de Mamiferos Aquaticos
Departamento de Oceanografia Biologica, Instituto Oceanografico,
Universidade de Sao Paulo
Praca do Oceanografico, 191, Sala 145-A
Butanta, Sao Paulo, SP, Brasil
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