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Heterogeneous feeding in benthic suspension feeders:the natural diet and grazing rate of the temperate gorgonian Paramuricea clavata (Cnidaria:Octocorallia) over a year cycle

1999; Inter-Research; Volume: 183; Linguagem: Inglês

10.3354/meps183125

1616-1599

Marta Ribes, Rafel Coma, JM Gili,

Microbial Community Ecology and Physiology

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 183:125-137 (1999) - doi:10.3354/meps183125 Heterogeneous feeding in benthic suspension feeders: the natural diet and grazing rate of the temperate gorgonian Paramuricea clavata (Cnidaria: Octocorallia) over a year cycle Marta Ribes*, Rafel Coma, Josep-Maria Gili Institut de Ciències del Mar (CSIC), Passeig Joan de Borbó s/n, E-08039 Barcelona, Spain *E-mail: mribes@icm.csic.es ABSTRACT: Paramuricea clavata Risso, 1826 (Cnidaria: Octocorallia) is a characteristic species of Mediterranean benthic fauna. The natural diet and prey capture rate of the species were studied in the field at the Medes Islands (NW Mediterranean Sea) using continuous flow incubation chambers. In situ grazing rates on DOC, detrital POC, and pico-, nano- and microplankton were examined over 1 annual cycle. P. clavata capture nanoeukaryotes, phytoplankton and ciliates as well as detrital POC. Colonies ingested an annual mean of 0.19 ± 0.17 µg C µg-1 C d-1 from these food sources. No significant capture of DOC and picoplankton (heterotrophic bacteria, Prochlorococcus sp., Synechococcus sp. and picoeukaryotes) was observed. Carbon of detrital origin accounted for 86 ± 14% of the total ingested carbon and showed a marked seasonal pattern in which winter and spring were the seasons with the highest ingestion rates. Ingestion of live POC also exhibited a marked seasonal pattern, with the highest values occurring in winter. The results show that P. clavata has a broad and heterogeneous diet that ranges from 3.8 µm (nanoeukaryotes) to 700 µm (copepods). Capture of detrital and live POC showed minimum values during the summer period, which supports the hypothesis that trophic limitations may underlie the summer regression in activity of the species. The results, together with evidence from previous studies, suggest that the capture of detrital POC may be a common and important feature among gorgonian species. It was calculated that the species daily captured 1-22% of diatoms, 1-9% of nanoeukaryotes, 1-26% of dinoflagellates, 2-99% of ciliates, and 2-10% of suspended detrital POC m-3 of the water adjacent to the bottom. The estimated capture rate of the species suggests that, in littoral ecosystems, grazing by macroinvertebrates on planktonic communities and suspended detrital POC should not be disregarded. KEY WORDS: Suspension feeding · Natural diet · Grazing rate · Prey selection · Gorgonians · Paramuricea clavata · Mediterranean Sea Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 183. Publication date: July 06, 1999 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1999 Inter-Research.