Can pelagic aggregations cause benthic satiation? Feeding biology of the Antarctic brittle star Astrotoma agassizii (Echinodermata: Ophiuroidea)

Dearborn, John H.; Ferrari, Frank D.; Edwards, K. C.

doi:10.1029/ar044p0001

Cited by 39 publications

(26 citation statements)

References 24 publications

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“…As reported by Dearborn (1977) and Dearborn et al (1986), A. agasizii preys on zooplankton, mainly on copepods and euphausiids, which are very abundant in South Georgian waters (Jansá, 1989). Considering this, almost the totality of the megabenthic epifauna on the South Georgia shelf would depend on the water column for its food supply.…”

Section: Faunistic Analysismentioning

confidence: 90%

The megazoobenthos of the Scotia Arc islands

Ramos¹

1999

Sci. Mar.

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Section: Faunistic Analysismentioning

confidence: 90%

The megazoobenthos of the Scotia Arc islands

Ramos¹

1999

Sci. Mar.

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“…This results in a trace of sediment and a gut full of sediment being assigned the same number of points. To minimize this bias toward trace amounts we adopted a modified fullness relative volume (FRV) method (Dearborn et al 1986, Ferrari & Dearborn 1989. In this system the points assigned to each food item within the gut are multiplied by the fullness index before being summed.…”

Section: Methodsmentioning

confidence: 99%

Diet, feeding behavior, and surface morphology of the multi-armed Antarctic sea star Labidiaster annulatus (Echinodermata Asteroidea)

Dearborn¹,

Edwards²,

Fratt³

1991

Mar. Ecol. Prog. Ser.

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Labidiaster annulatus is a large, multi-armed sea star common in moderate depths along the Antarctic Peninsula and off the islands of the Scotia Arc. Analyses by frequency of occurrence and several volumetric methods of stomach contents from 194 individuals from South Georgia, the South Sandwich Islands, and the Antarctic Peninsula show L. annulatus is an active and opportunistic predator and scavenger on prey from at least 10 phyla. Most common prey are euphausiids and amphipods which are caught initially by large, crossed, toothed pedicellariae arranged in wreaths on annuli along the arms and subsequently retained and passed to the oral surface and along the ambulacral groove to the mouth by the action of flexible arms and tube feet. L. annulatus obtains food, including activelyswimming crustaceans and small fish, directly from the water column, and to a lesser degree from within and on the substrate. Patterns of surface ciliation suggest that no methods of feeding involving cilia are utilized. Differences in the size and function of crossed pedicellariae, sources and types of prey and methods of prey capture now suggest that L. annulatus is not an ecological equivalent of Pycnopodia helianthoides from western North America.

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“…It is likely, as suggested by González (1992) for the Antarctic, that sinking faeces of E.vallentini produced in the upper layer of these fjords will constitute a substantial, patchy source of organic matter to the benthos. Additionally, downward migrating herbivores may reach close proximity to the bottom substrate and provide a rich, seasonally predictable food source to benthic invertebrates (Dearborn et al, 1986). The occurrence of planktonic diel migrators in shallow waters presents some interesting possibilities with respect to their ability to make use of alternative food sources during their proximity to hard substrate.…”

Section: Linkages In a Spatial Gradientmentioning

confidence: 99%

Plankton of Southern Chilean fjords: trends and linkages

Antezana¹

1999

Sci. Mar.

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SUMMARY: The present paper compiles and reviews past and recent results from Magellan and Fuegian fjords for an overview of the planktonic assemblage there. It first examines linkages to local, adjacent and remote environments. The plankton assemblage presents deviations from the biota of the Magellan biogeographic Province, where the occasional presence of Antarctic species is related to oceanographic phenomena at the Polar Front. Complex bathymetric and hydrographic features within the fjords suggest that the plankton is rather isolated. Adaptations and constraints for population survival, and the role of diel migrators and gregarious zooplankters with regard to bentho-pelagic coupling are discussed. Results on seasonal differences in the plankton of the largest and most isolated basin of the Strait of Magellan are compiled. In spring the plankton was dominated by large diatoms suggesting a short food chain where most of the phytoplankton bloom goes to the bottom, to the meroplankton and to a few dominant holoplankters. In summer, the phytoplankton was dominated by picoand nanophytoplankton suggesting a more complex food web mediated by a bacterial loop. High abundance of holo-and meroplanktonic larvae coincided with spring blooming conditions. Key words: Estuarine, Subantarctic, adaptations, patterns, seasonal, migration, food webs. RESUMEN: PLANCTON DE LOS FIORDOS DEL SUR DE CHILE: TENDENCIAS Y CONEXIONES. -Este trabajo compila y revisa los resultados pasados y recientes de los fiordos fueguinos y magallánicos para proporcionar una visión integral de la comunidad planctónica. Primero se examinan las conexiones con los ambientes locales adyacentes y remotos. La comunidad planctónica presenta desviaciones de la biota de la Provincia biogeográfica Magallánica, donde la presencia ocasional de especies antárticas se relaciona con fenómenos oceanográficos en el Frente Polar. Rasgos batimétricos e hidrográficos complejos en los fiordos sugieren que el plancton está más bien aislado. Se discuten las adaptaciones y limitaciones para la supervivencia poblacional y el papel de los migradores diarios y del zooplancton gregario con respecto al acoplamiento bentopelágico. Se resumen los resultados sobre diferencias estacionales en el plancton de la más vasta y aislada cuenca del Estrecho de Magallanes. En primavera, el plancton estuvo dominado por diatomeas grandes, sugiriendo una cadena trófica corta, en la que la mayor parte de la biomasa producida va al fondo, al meroplancton y a unos pocos organismos dominantes del holoplancton. En verano, el fitoplancton estuvo dominado por pico-y nanofitoplancton, sugiriendo una red trófica más compleja mediada por un bucle bacteriano. La gran abundancia de larvas holo-y meroplanctónicas coincidió con las condiciones de proliferación primaveral.

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Can pelagic aggregations cause benthic satiation? Feeding biology of the Antarctic brittle star Astrotoma agassizii (Echinodermata: Ophiuroidea)

Abstract: Abstract. Information on the diet, feeding behavior, and surface morphology was obtained for Astrotoma agassizii, a large, simple-armed

Cited by 39 publications

References 24 publications

The megazoobenthos of the Scotia Arc islands

The megazoobenthos of the Scotia Arc islands

Diet, feeding behavior, and surface morphology of the multi-armed Antarctic sea star Labidiaster annulatus (Echinodermata Asteroidea)

Plankton of Southern Chilean fjords: trends and linkages

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