Fish predation on neritic ctenophores from the Argentine continental shelf: A neglected food resource?

Mianzán, Hermes; Marí, Noemí R.; Prenski, B.; Sánchez, Felisa

doi:10.1016/0165-7836(95)00459-9

Cited by 77 publications

(66 citation statements)

References 13 publications

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“…The dominance of T. kerguelensis in the diet suggested that B. macloviana fed deep in the substrate. On the other hand, Mianzan et al (1996) found that this species may also feed on ctenophores, a feeding behaviour that can be explained by the later finding of nearbottom aggregations of these planktonic organisms (Costello and Mianzan, 2003;Colombo et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology of <i>Bathyraja macloviana</i> (Rajiformes, Arhynchobatidae): a polychaete-feeding skate from the South-west Atlantic

Mabragaña¹,

Giberto²,

Bremec³

2005

Sci. Mar.

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SUMMARY: The present paper analyses the diet, feeding strategy and niche width of B. macloviana in a sector of the Argentinean Continental Shelf (ACS). Individuals (n = 147) were collected from 43 sampling stations in late summer and autumn 2001. Thirty one alimentary items in the gut contents were found, with a clear dominance of polychaetes. Crustaceans were secondary alimentary items. The polychaete Travisia kerguelensis was the main food item ingested, followed by Nepthyidae, Sabellidae and Lumbrineridae, while Gammaridae and Cirolanidae were the main items among crustaceans. The niche width and feeding strategy displayed by B. macloviana support the specialisation towards polychaetes throughout this study. Slow motile and infaunal species constitute major preys. The results suggest that this skate actively selects worms, reflecting, in some sense, the composition of the polychaete assemblage, and allowing a low dietary overlap with other sympatric skates of the ACS.Keywords: skates, feeding strategy, polychaetes, niche width, specialist, Argentina. RESUMEN: ECOLOGÍA ALIMENTARIA DE BATHYRAJA MACLOVIANA (RAJIFORMES, ARHYNCHOBATIDAE): UNA RAYA CONSUMIDORA DE POLIQUETOS DEL ATLÁNTICO SUDOCCIDENTAL. -En el presente trabajo se analiza la dieta, estrategia alimentaria y amplitud del nicho trófico de Bathyraja macloviana en un sector de la Plataforma Continental Argentina (ACS). Los individuos (n = 147), fueron colectados en 43 estaciones de muestreo a fines de verano y otoño de 2001. Fueron encontrados 31 ítems en los contenidos estomacales con una clara dominancia de poliquetos. Los crustáceos constituyeron ítems secundarios. El poliqueto Travisia kerguelensis fue el principal ítem consumido seguido por Nepthyidae, Sabellidae y Lumbrineridae, mientras que Gammaridea y Cirolanidae fueron los ítems principales entre los crustáceos. En este estudio, la amplitud de nicho y la estrategia alimentaria de esta especie muestran su especialización hacia poliquetos. Especies de baja motilidad e infaunales constituyeron las presas fundamentales. Los resultados sugieren que esta raya selecciona activamente poliquetos, reflejando de algún modo las asociaciones de poliquetos, lo que permite un bajo solapamiento con otras especies de rayas simpátricas del Atlántico Sudoccidental.Palabras clave: rayas, estrategia alimentaria, poliquetos, amplitud de nicho, especialista, Argentina.

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Section: Discussionmentioning

confidence: 99%

Feeding ecology of <i>Bathyraja macloviana</i> (Rajiformes, Arhynchobatidae): a polychaete-feeding skate from the South-west Atlantic

Mabragaña¹,

Giberto²,

Bremec³

2005

Sci. Mar.

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“…In Baltic pelagic food webs, predation on a combination of heterotrophic and autotrophic microplankton by M. ovum could potentially imply competitive interactions with herbivorous crustaceans. On the other hand, similar to ctenophores in other regions (Mianzan et al 1996), M. ovum could serve as a prey for zooplanktivores, such as mysids, herring, and sprat-a prey that has never been accounted for in food web models. The assessment of M. ovum's ecological significance in the Baltic Sea requires coherent experimental and field studies as well as data on its distribution and population dynamics.…”

Section: Discussionmentioning

confidence: 99%

Molecular evidence for the occurrence of ctenophore Mertensia ovum in the northern Baltic Sea and implications for the status of the Mnemiopsis leidyi invasion

Gorokhova

Lehtiniemi²,

Viitasalo-Frösen³

et al. 2009

Limnology & Oceanography

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Nucleotide sequence analysis of 18S ribosomal RNA gene (rRNA), internal transcribed spacer, and 5.8S rRNA was used for taxonomic identification of ctenophores collected in the northern Baltic Sea, where invasive Mnemiopsis leidyi and native Pleurobrachia pileus have been reported to occur. Contrary to previous reports, sequence analysis of 53 randomly selected specimens from seven stations revealed that none of them were M. leidyi or P. pileus. The 18S rRNA and 5.8S rRNA sequences were 100% identical to those of Mertensia ovum, a ctenophore with a broad Arctic and circumboreal distribution, which has never been reported to occur in the Baltic Sea. Polymerase chain reaction screening with primers designed to amplify all three species, and using ctenophores collected by vertically stratified sampling, confirmed that all ctenophores collected in this survey were M. ovum. The ctenophore abundance was high, up to 4500 individuals m 22 , positively correlating with salinity. Our findings emphasize the utility of applying molecular tools to biological surveys and the importance of rigorous species identification. They also indicate that M. leidyi, which is a threat to the southern Baltic ecosystem, does not occur in the northern part of the sea, and call for a pan-Baltic survey to establish current distributions of ctenophores, both native and invasive.

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“…In aquatic communities, body shape and size and mouth position has been related directly to foraging success (KARPOUZI & STERGIOU 2003). These similarities could be the reason why they have adapted to explore different bay zones, with the abundant M. furnieri being more adapted to cope with harsh condi- NARANJO (1956), (5) MIANZAN et al (1996), (6) SIERRA et al (1994), (7) Austin & AUSTIN (1971), (8) VAZZOLER (1971), (9) FIGUEIREDO & VIEIRA (1998); (10) CHAO (1978), (11) CERVIGÓN (1993), (12) CERVIGÓN et al (1992), (13) BOWMAN et al (2000).…”

Section: Discussionmentioning

confidence: 99%

Environmental influences on distribution of four Sciaenidae species (Actinopterygii, Perciformes) in a tropical bay at Southeastern Brazil

2006

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We sampled fish and measured environmental variables in the Sepetiba Bay, a tropical embayment at Southeastern Brazil. The aim was to assess environmental influences on distribution of four abundant species of Sciaenidae Micropogonias furnieri (Desmarest, 1823), Ctenosciaena gracilicirrhus (Metzelaar, 1919), Cynoscion leiarchus (Cuvier, 1830) and Menticirrhus americanus (Linnaeus, 1758) to test the habitat partition hypothesis. Samples were taken between June 1993 and July 1996, at three bay zones (outer, central and inner). Depth was the most important environmental variable to influence fish distribution, followed by transparency. M. furnieri showed significant negative correlation to depth, transparency and salinity, while C. gracilicirrhus showed the opposite situation. The highest densities of C. leiarchus occurred in the lowest temperature, while M. americanus did not showed preferences for any of the examined environmental variables. Spatial separation, mainly between M. furnieri and C. gracilicirrhus, seems to be the strategy developed to coexist in the Sepetiba Bay, with M. furnieri being more adapted to copy with harsh environmental conditions of the inner bay. The other three species, which use mostly the outer bay zone, seem to be restricted to more stable conditions, where influences from oceanic waters are more intense.

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Fish predation on neritic ctenophores from the Argentine continental shelf: A neglected food resource?

Cited by 77 publications

References 13 publications

Feeding ecology of <i>Bathyraja macloviana</i> (Rajiformes, Arhynchobatidae): a polychaete-feeding skate from the South-west Atlantic

Feeding ecology of <i>Bathyraja macloviana</i> (Rajiformes, Arhynchobatidae): a polychaete-feeding skate from the South-west Atlantic

Molecular evidence for the occurrence of ctenophore Mertensia ovum in the northern Baltic Sea and implications for the status of the Mnemiopsis leidyi invasion

Environmental influences on distribution of four Sciaenidae species (Actinopterygii, Perciformes) in a tropical bay at Southeastern Brazil

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