Padrões de distribuição das assembleias de peixes e cefalópodes demersais na plataforma e talude continental da Bacia de Campos

Costa, Paulo A. S.; Braga, Adriana dā Costa; Martins, Agnaldo Silva; Haimovici, Manuel

doi:10.1016/b978-85-352-7295-6.50004-x

Cited by 2 publications

(1 citation statement)

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“…It seems that the abundance of the commonest loliginid squids off the southern Brazilian coast has shifted in the last few decades. Doryteuthis pleii apparently replaced D. sanpaulensis as the most abundant squid in some areas where the latter species used to be dominant, such as off the coast of northern Rio de Janeiro (~23°S) (e.g., Costa et al 2017). Whether this apparent shift was caused by climate change or not is currently unknown.…”

Section: Discussionmentioning

confidence: 99%

Biology, distribution and geographic variation of loliginid squids (Mollusca: Cephalopoda) off southwestern Atlantic

Martins¹,

Juanicó²

2018

Zoologia

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The biology and ecology of southwestern Atlantic loliginid squids have been intensively researched in the last few decades, mostly off the Brazilian southern coast. However, information gathered by scientific research cruisers, either past or recent, is limited. Three species of loliginid squids – the warm-tempered Doryteuthissanpaulensis (Brakoniecki, 1984), plus the tropical D.pleii (Blainville, 1823) and Lolligunculabrevis (Blainville, 1823) – were sampled along 16 degrees of latitude on the southwestern Atlantic (22–38°S). The samples were obtained mostly from oceanographic surveys, but also included squids caught by commercial fisheries, and a few specimens from museum collections. Squid response to abiotic variables, morphological variation and circadian behaviour were surveyed in detail. Doryteuthissanpaulensis can be divided into at least six distinguishable geographical groups, which do not form a cline. In contrast, D.pleii can be divided into only two morphological groups that are very similar. Doryteuthis spp. were heterogeneously distributed on the shelf, whereas L.brevis was confined nearshore. Our data extended the southernmost distribution range of D.pleii by at least nine degrees of latitude, owing to specimens obtained at ~38°S (Mar del Plata, Argentina). Small, immature D.sanpaulensis were sampled inside the Patos Lagoon estuary (~32°S). The morphologically similar Doryteuthis spp. apparently avoid direct competition by concentrating at different depths, displaying different thermal preferences, and inverse circadian levels of activity. The information reported herein may be regarded as a “snapshot” of the ecology of sympatric squids in a marine environment that has not been deeply affected by climate change.

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Section: Discussionmentioning

confidence: 99%