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Marine Biology

, Volume 144, Issue 1, pp 89–99 | Cite as

Temporal variability in zooplankton prey capture rate of the passive suspension feeder Leptogorgia sarmentosa (Cnidaria: Octocorallia), a case study

  • S. Rossi
  • M. Ribes
  • R. Coma
  • J.-M. Gili
Research Article

Abstract

There is increasing evidence that suspension feeders play a significant role in plankton–benthos coupling. However, to date, active suspension feeders have been the main focus of research, while passive suspension feeders have received less attention. To increase our understanding of energy fluxes in temperate marine ecosystems, we have examined the temporal variability in zooplankton prey capture of the ubiquitous Mediterranean gorgonian Leptogorgia sarmentosa. Prey capture was assessed on the basis of gut content from colonies collected every 2 weeks over a year. The digestion time of zooplankton prey was examined over the temperature range of the species at the study site. The main prey items captured were small (80–200 µm), low-motile zooplankton (i.e. eggs and invertebrate larvae). The digestion time of zooplankton prey increased when temperature decreased (about 150% from 21°C to 13°C; 15 h at 13°C, 9 h at 17°C, and 6 h at 21°C), a pattern which has not previously been documented in anthozoans. Zooplankton capture rate (prey polyp−1 h−1) varied among seasons, with the greatest rates observed in spring (0.16±0.02 prey polyp−1 h−1). Ingestion rate in terms of biomass (μg C polyp−1 h−1) showed a similar trend, but the differences among the seasons were attenuated by seasonal differences in prey size. Therefore, ingestion rate did not significantly vary over the annual cycle and averaged 0.019±0.002 μg C polyp−1 h−1. At the estimated ingestion rates, the population of L. sarmentosa removed between 2.3 and 16.8 mg C m−2 day−1 from the adjacent water column. This observation indicates that predation by macroinvertebrates on seston should be considered in energy transfer processes in littoral areas, since even species with a low abundance may have a detectable impact.

Keywords

Prey Item Capture Rate Prey Capture Suspension Feeder Digestion Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors thank I. Llobet for examining the zooplankton samples and M. Cascante, A. Cugat and A. Liebt for examining the gut contents. The experiments comply with the current laws of Spain, where they were conducted. Support for this work was provided by a F.P.I. fellowship from the Spanish Ministry of Education and Culture (MEC), which was granted to S.R. under D.G.I.C.Y.T. project PB94-0014-C02-01, a “Ramón y Cajal” research contract granted to M.R. by the MEC, a research contract granted to R.C. by the MEC, and by D.G.I.C.Y.T. projects REN2000-0633-C03-01/MAR and REN2002-01631/MAR.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Institut de Ciències del Mar (CSIC)BarcelonaSpain
  2. 2.Centre d’Estudis Avançats de Blanes (CSIC)Blanes GironaSpain

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