Feeding habits and prey selection by the skate Dipturus chilensis (Elasmobranchii: Rajidae) from the south-western Atlantic

Lucifora, Luis O.; Valero, Juan L.; Bremec, Claudia; Lasta, Mario

doi:10.1017/s002531540000299x

Cited by 46 publications

(42 citation statements)

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“…Other benthic invertebrates are present in the diet but in lower proportions. The dominance of fishes and cephalopods in the diet of large individuals of larger skate species has been reported by several authors (Ebert et al, 1991;Smale and Cowley, 1992;Orlov, 1998;Lucifora et al, 2000;Koen Alonso et al, 2001;Brickle et al, 2003). Koen Alonso et al (2001) noted that smaller specimens of the long nose skate Dipturus chilensis in the Argentinean Sea preyed on benthic crustaceans, whereas larger individuals foraged mostly on fishes and molluscs.…”

Section: Discussionmentioning

confidence: 68%

“…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%

“…Brickle et al (2003) provided some data on diet composition of B. albomaculata, B. brachyurops and B. griseocauda around the Malvinas Islands. The diet composition of skate species of other genera have been studied in the region (Lucifora et al, 2000;Koen Alonso et al, 2001;Sánchez and Mabragaña, 2002;Braccini and Perez, 2005;Mabragaña et al, 2005;Mabragaña and Gilberto, 2007;San Martín et al, 2007). Although understanding a predator's trophic interactions is crucial for developing sustainable management strategies (Robinson et al, 2007), trophic relationships among skate species in Argentinean waters remain unknown.…”

Section: Introductionmentioning

confidence: 99%

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Hábitos alimentarios de la raya de cola corta, Bathyraja brachyurops (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: 68%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2008

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“…Birth, growth until sexual maturity, mating and the laying of eggs or breeding, are completed in these coasts (Cousseau, 1986;Chiaramonte, 1998;Lucifora et al, 2000aLucifora et al, , 2000bChiaramonte and Pettovello, 2000;Braccini and Chiaramonte, 2002;Lucifora et al, 2002). Likewise, the biggest disembarked volumes of chondrichthians come from this region (Massa et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Histological remarks of the oviduct and the oviducal gland of Sympterygia acuta Garman, 1877

Ej¹,

Estecondo²

2008

Braz. J. Biol.

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The elasmobranchs constitute an important resource in Argentinian fishing and they show reproductive characteristics that make them susceptible to the pressure of fishing. In spite of the importance of the resource our knowledge about the species of the Southwestern Atlantic is scarce. In this work we study the microanatomy of the oviduct and the oviducal gland of Sympterygia acuta. The results show a very folded oviduct with mucous and ciliated cells. The oviducal gland depicts the same zonation as other batoids, showing the typical four regions (club, papillary, baffle and terminal). The epithelium lining the glandular lumen is simple columnar with ciliated and glandular cells. The four zones show simple or ramified tubular gland the secretions of which constitute the egg's envelopes. The club and baffle zones are similar to those present in other species. The papillary one depicts a different pattern of secretions that other Rajiformes and the last zone of the gland is characterized by mixed adenomers. The information here exposed constitutes the first report on the microanatomy of the genital tract of S. acuta.Keywords: Elasmobrachs, oviducalgland, reproduction, Sympterygia acuta. Observações histológicas do oviduto e da glândula oviducal de Sympterygia acuta Garman, 1877 ResumoOs elasmobranchii constituem um importante recurso pesqueiro na Argentina e mostram características reprodutivas que os fazem suscetíveis à pressão de pesca. Apesar da importância do recurso, nosso conhecimento sobre as espécies do Atlântico do Sudoeste é escasso. Neste trabalho, estudamos a microanatomia do oviduto e da glândula oviducal de Sympterygia acuta. Os resultados mostram um oviduto muito dobrado, com células mucosas e células ciliadas. A glân-dula oviducal apresenta as mesmas zonas que outros batóideos, mostrando as quatro regiões típicas (club, papillary, baffle e terminal). O epitélio que reveste o lúmen glandular é simples, com células ciliadas e células glandulares. As quatro zonas mostram glândulas tubulares simples ou ramificadas e suas secreções constituem os envelopes do ovo. As zonas do club e baffle são semelhantes aquelas presentes em outras espécies. A papilar tem um padrão de secreção diferente de outros Rajiformes e a última zona da glândula é caracterizada por adenômeros mistos. A informação aqui exposta constitui o primeiro relato sobre a microanatomia do trato genital de S. acuta.Palavras-chave: Elasmobranchii, glândula oviducal, reprodução, Sympterygia acuta.

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“…Santiago et al (2010) found that size-related shift in diet is probably related to morphological limitations. And many reports show that ontogenetic changes in the diet of fishes have been related to changes in the size of the mouth (Schael et al 1991;Lucifora et al 2000). Swimming speed is also correlated with feeding of fish, and larger pectoral fins are able to facilitate accurate and stable feeding (Higham 2007).…”

Section: Discussionmentioning

confidence: 99%

Diet of Leptobotia elongata revealed by stomach content analysis and inferred from stable isotope signatures

et al. 2015

Environ Biol Fish

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The diet of Leptobotia elongata in the Yibin reach of the Yangtze River, China was investigated by stomach content analysis and by stable isotope analysis from muscle. The results of the two methods were agreement. Both stomach contents and isotope analysis indicated that L. elongata fed in spring mainly on plankton, shrimp and fish, and secondarily on benthic invertebrates and aquatic insect larvae. For the stomach content analysis, the diet composition showed significant differences among the size classes in relative weight of prey items, with L. elongata changing feeding habits at c.110 mm standard length. The smaller individuals fed on benthic invertebrates and aquatic insect larvae, whereas individuals >109 mm fed mainly on shrimp and fish. A similar shift to piscivory at c.110 mm standard length was found using the stable isotope mixing model to reveal dietary ontogeny by IsoSource software, and the trend in variation of the δ

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Feeding habits and prey selection by the skate Dipturus chilensis (Elasmobranchii: Rajidae) from the south-western Atlantic

Cited by 46 publications

References 4 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

Histological remarks of the oviduct and the oviducal gland of Sympterygia acuta Garman, 1877

Diet of Leptobotia elongata revealed by stomach content analysis and inferred from stable isotope signatures

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