[MARMAM] Abstract: Distribution and habitat characteristics of the genus Stenella in the southwest Atlantic Ocean

Ignacio Moreno iggy.moreno at gmail.com
Tue Sep 20 19:02:26 PDT 2005


A new paper on Stenella distribution has been published.

Reprints available upon request to: Ignacio Moreno - iggy.moreno at gmail.com

Moreno IB, Zerbini AN, Danilewicz D, de Oliveira Santos MC,
Simões-Lopes PC, Lailson-Brito J Jr., Azevedo AF (2005) Distribution
and habitat characteristics of dolphins of the genus Stenella
(Cetacea: Delphinidae) in the southwest Atlantic Ocean. Marine Ecology
Progress Series, 300:229-240

ABSTRACT: The distribution of dolphins of the genus Stenella is poorly
known in the southwest Atlantic Ocean. A complete review of records (n
= 311) of these dolphin species was performed to describe distribution
and habitat. Atlantic spotted dolphins S. frontalis occur in both
southern (21 to 33° S) and northern Brazil (north of 06° S), with a
hiatus in its distribution off eastern South America. This species
presents the highest preference for nearshore habitats, restricted to
waters within the 1000 m isobath. Pantropical spotted dolphins S.
attenuata are found in tropical waters as far south as 22° S and are
mainly observed off northeastern South America. They occur beyond the
continental shelf break in depths >850 m. Clymene dolphins S. clymene
are distributed in deep waters (1390 to 4500 m) as far south as 30° S.
Strandings are more common where the continental shelf is narrower.
Spinner dolphins S. longirostris are found in oceanic waters as far
south as 30° S. They inhabit tropical waters over the shelf and slope
(depths ranging from 170 to 2700 m). The striped dolphin S.
coeruleoalba is the least known species of the genus in the western
South Atlantic. Most records are from temperate waters in southern
Brazil and Argentina. The distributions of S. attenuata, S. clymene
and S. longirostris overlap to a great extent and are predominantly
oceanic and associated with warm ocean currents. S. frontalis seems to
prefer a different, coastal habitat, influenced both by warm currents
and upwelling areas. The discontinuous distribution of this species
suggests that an isolated population inhabits the southern coast of
Brazil.

KEY WORDS: Stenella · Atlantic Ocean · Brazil · Uruguay · Argentina ·
Distribution · Habitat characteristics

-- 
Ignacio Moreno
iggy.moreno at gmail.com

Grupo de Estudos de Mamíferos Aquáticos do Rio Grande do Sul - GEMARS
Rua Felipe Neri, 382/203
90440-150 - Porto Alegre/RS - Brasil
e-mail: gemars at terra.com.br
http://www.ufrgs.br/ceclimar/gemars




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