Food and feeding of the short-finned squid Illex argentinus (Cephalopoda: Ommastrephidae) off southern Brazil

Santos, Roberta Aguiar dos; Haimovici, Manuel

doi:10.1016/s0165-7836(97)00071-4

Cited by 53 publications

(55 citation statements)

References 8 publications

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“…The Argentine hake is the most important demersal fishing resource on the Argentinean shelf (Bezzi et al, 2004). Furthermore, the Argentine hake is consumed by a lot of organisms, such as Illex argentinus (Santos and Haimovici, 1997), Squalus acanthias (García de la Rosa and Sánchez, 1997), Dipturus chilensis (Lucifora et al, 2000;Koen Alonso et al, 2001), dusky dolphins Lagenorynchus obscurus (Alonso et al, 1998) and 20 other fish species (García de la Rosa and Sánchez, 1997), which prey on different stages of ontogeny.…”

Section: Discussionmentioning

confidence: 99%

Hábitos alimentarios de la raya de cola corta, <i>Bathyraja brachyurops</i> (Chondrichthyes, Rajidae), en el Atlántico Sudoccidental

et al. 2008

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SUMMARY: Food habits of Bathyraja brachyurops were studied based on stomach content analyses of 346 specimens collected from research cruises carried out from 2003 to 2005 on the Argentinean continental shelf (36 o S-55 o S). A total of 265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny were found. The Levins' standardized index indicated wider niche breadth for small skates, whereas larger skate specimens showed a narrow niche breadth with a specialization in fishes.Keywords: Bathyraja, Argentina, broad nose skate, elasmobranchs, trophic ecology. RESUMEN: Hábitos alimentarios de la raya de cola corta, BATHYRAJA BRACHYUROPS (Chondrichthyes, Rajidae), en el Atlántico Sudoccidental. -Se estudiaron los hábitos alimentarios de Bathyraja brachyurops en base al análisis de los contenidos estomacales de 346 ejemplares capturados en campañas de investigación realizadas durante el periodo 2003-2005 sobre la plataforma continental Argentina (36 o S-55 o S). Un total de 265 estómagos (76.6%) contenían alimento en los cuales se identificaron treinta y cinco ítems presa. Las presas más importantes fueron los peces, seguidos por los isópodos, ubicando a B. brachyurops como un consumidor terciario a lo largo de toda su historia de vida. No se hallaron diferencias en la composición de la dieta entre sexos y regiones, sin embargo se apreciaron cambios ontogenéticos en la alimentación. El índice de Levins' estandarizado indicó una mayor amplitud de nicho para las rayas de menor tamaño, mientras que los ejemplares de mayor tamaño mostraron una menor amplitud de nicho trófico y una especialización ictiófaga.

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Section: Discussionmentioning

confidence: 99%

Hábitos alimentarios de la raya de cola corta, <i>Bathyraja brachyurops</i> (Chondrichthyes, Rajidae), en el Atlántico Sudoccidental

et al. 2008

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“…We have also observed occasional massive landings of mature (males and females) and immature specimens of the onefin skate captured as bycatch by the deep-water trawl squid fishery off southern Brazil (July-September/2000) with stomachs full of squid chunks (Illex argentinus). These specimens were not included in this study since no precise catch locality information was available, but they were probably feeding on aggregations of spawned dead squids left on the sea floor (Santos & Haimovici, 1997).…”

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confidence: 99%

Stomach contents and notes on the reproduction of the Onefin Skate Gurgesiella dorsalifera (Chondrichthyes: Rajidae) off Southern Brazil

2008

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The Brazilian endemic deep-water onefin skate (Gurgesiella dorsalifera) is a rare small species recently described in the 80's. No biological information is available on this species and its extremely restricted geographic distribution has been used to classify it as a vulnerable species under IUCN red list criteria. Twenty four specimens (115 to 207 mm disc width) were captured off southern Brazilian coast at the region of Cape Santa Marta Grande (State of Santa Catarina) by deep-water otter trawl (430-524 m). The analysis of stomach contents revealed an apparent opportunistic predation on juveniles of Urophycis brasiliensis (IRI = 6944), with an average total length of 21 mm, followed by mysidaceans (IRI = 2938), unidentified teleosts (IRI = 1969), the copepod Bradyidius plinioi (IRI = 393), and decapod crustaceans (IRI = 297). One mature female with 207 mm DW had two egg cases in its uteri.A raia endêmica brasileira de profundidade Gurgesiella dorsalifera é uma espécie rara e de pequeno porte recentemente descrita nos anos 80. Não há informações disponíveis sobre a sua biologia e sua distribuição geográfica extremamente restrita tem sido utilizada para classificá-la como uma espécie vulnerável sob os critérios da Lista Vermelha da IUCN. Vinte e quatro espécimes (larguras de disco entre 115-207 mm) foram capturados na costa do sul do Brasil na região do Cabo de Santa Marta Grande (Estado de Santa Catarina) por arrasto de fundo de profundidade (430-524 m). A análise dos conteúdos estomacais revelou um aparente oportunismo predatório sobre juvenis de Urophycis brasiliensis (IRI = 6944) com comprimento total médio de 21 mm, seguido por crustáceos misidáceos (IRI = 2938), teleósteos não identificados (IRI = 1969), o copépode Bradyidius plinioi (IRI = 393) e crustáceos decápodes (IRI = 297). Uma fêmea adulta com 207 LD apresentava dois ovos, um em cada útero.

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“…In contrast with most studies pointing out cephalopods as a common prey in the diet of the dusky grouper (Barreiros & Santos, 1998;Harmelin & Harmelin-Vivien, 1999;Reñones et al, 2002;Linde et al, 2004;López & Orvay, 2005), these prey taxa were not found in the stomach content of the individuals inhabiting the studied man-made rocky bottom (MBRG). In southern Brazil, squids (e.g., Illex argentinenis, Loligo sanpaulensis) and octopuses (e.g., Octopus vulgares, O. tehuelchus) are usually found along the continental shelf and continental slope (Haimovici & Álvarez-Perez, 1990;Andriguetto & Haimovici, 1996;Santos & Haimovici, 1997;Santos & Haimovici, 2002), but they are presumably absent in the shallow waters (<10m) where the studied site (MBRG) is located. Other mollusks, such as bivalves and gastropods, were found in the stomach content of the dusky grouper at MBRG.…”

Section: Discussionmentioning

confidence: 99%

Diet and feeding strategy of the dusky grouper Mycteroperca marginata (Actinopterygii: Epinephelidae) in a man-made rocky habitat in southern Brazil

et al. 2011

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The dusky grouper (Mycteroperca marginata) is a marine species usually associated with rocky bottoms and reefs. The present work investigated the diet and feeding strategy of a dusky grouper population inhabiting a 4.5 km long pair of rocky jetties located in the mouth of Patos Lagoon estuary. No prior research has been conducted in such man-made habitat and the current study provides a basis for comparative studies on the diet of the dusky grouper populations inhabiting natural vs. manmade rocky habitats. Similarly with previous studies on natural substrates, crabs and fishes were the main food categories consumed (%IRI = 85.1 and %IRI = 12.6, respectively), whereas shrimps and mollusks had lower importance in the diet (%IRI = 1.9 and 0.4, respectively). As previously reported for dusky grouper populations inhabiting reefs and rocky bottoms, the present work revealed conspicuous size related dietary shifts. Blue crabs and fishes become increasingly important food items in the diet of larger individuals (> 500 mm, TL). Finally, it was found that the studied dusky population has a generalist feeding strategy with a high between-individual variation in prey consumption. Such strategy remained similar across the size increment of the species. Our findings suggest that man-made rocky substrates provide suitable feeding grounds for the dusky grouper in southern Brazil and could be used as an additional tool in the conservation efforts of this endangered species.A garoupa-verdadeira (Mycteroperca marginata) é uma espécie marinha geralmente associada a fundos rochosos e recifes. O presente trabalho investiga a dieta e estratégia alimentar de uma população da garoupa-verdadeira que habita um longo (4,5 km) par de molhes de pedra na desembocadura do estuário da laguna dos Patos, sul do Brasil. Não há trabalhos anteriores realizados nesse tipo de habitat construído pelo homem e este trabalho fornece uma base de comparação com estudos de dieta de outras populações da garoupa-verdadeira ocorrendo em habitats naturais. De modo similar ao encontrado em estudos prévios realizados em substratos naturais, caranguejos e peixes foram as principais categorias de alimento consumidas (%IRI = 85,1 e %IRI = 12,6, respectivamente), enquanto camarões e moluscos tiveram menor importância na dieta (%IRI = 1,9 e %IRI = 0,4, respectivamente). Como reportado anteriormente para populações de garoupa-verdadeira que habitam recifes e fundos rochosos, o presente trabalho revelou marcadas mudanças na dieta em função do tamanho da espécie. Siri-azul e peixes tornam-se gradativamente mais importantes na dieta de indivíduos maiores (> 500 mm de comprimento total, CT). Finalmente, foi observado que a população de garoupa-verdadeira teve uma estratégia alimentar generalista com uma elevada variação entre indivíduos no consumo de presas. Essa estratégia permaneceu similar ao longo do aumento em tamanho da espécie. Os resultados do presente trabalho sugerem que substratos rochosos estabelecidos pelo homem propiciam locais de alimentação adequados para a ...

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Food and feeding of the short-finned squid Illex argentinus (Cephalopoda: Ommastrephidae) off southern Brazil

Cited by 53 publications

References 8 publications

Hábitos alimentarios de la raya de cola corta, <i>Bathyraja brachyurops</i> (Chondrichthyes, Rajidae), en el Atlántico Sudoccidental

Hábitos alimentarios de la raya de cola corta, <i>Bathyraja brachyurops</i> (Chondrichthyes, Rajidae), en el Atlántico Sudoccidental

Stomach contents and notes on the reproduction of the Onefin Skate Gurgesiella dorsalifera (Chondrichthyes: Rajidae) off Southern Brazil

Diet and feeding strategy of the dusky grouper Mycteroperca marginata (Actinopterygii: Epinephelidae) in a man-made rocky habitat in southern Brazil

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