KNAW Repository

Is benthic food web structure related to diversity of marine macrobenthic communities?

Sokolowski, A. and Wolowicz, M. and Asmus, H. and Asmus, R. and Carlier, A. and Gasiunaite, Z. and Gremare, A. and Hummel, H. and Lesutiene, J. and Razinkovas, A. and Renaud, P.E. and Richard, P. and Kedra, M. (2012) Is benthic food web structure related to diversity of marine macrobenthic communities? Estuarine Coastal and Shelf Science, 108, 76-86. ISSN 0272-7714.

[img]PDF - Published Version
Restricted to KNAW only

593Kb

Official URL: http://dx.doi.org/10.1016/j.ecss.2011.11.011

Abstract

Numerical structure and the organisation of food webs within macrozoobenthic communities has been assessed in the European waters (Svalbard, Barents Sea, Baltic Sea, North Sea, Atlantic Ocean and the Mediterranean Sea) to address the interactions between biodiversity and ecosystem functioning. Abundance and classical species diversity indices (S, H′, J) of macrofaunal communities were related to principal attributes of food webs (relative trophic level and food chain length, FCL) that were determined from carbon and nitrogen stable isotope values. Structure of marine macrobenthos varies substantially at a geographical scale; total abundance ranges from 63 ind. m−2 to 34,517 ind. m−2, species richness varies from 3 to 166 and the Shannon-Weaver diversity index from 0.26 to 3.26 while Pielou’s evenness index is below 0.73. The major source of energy for macrobenthic communities is suspended particulate organic matter, consisting of phytoplankton and detrital particles, sediment particulate organic matter, and microphytobenthos in varying proportions. These food sources support the presence of suspension- and deposit-feeding communities, which dominate numerically on the sea floor. Benthic food webs include usually four to five trophic levels (FCL varies from 3.08 to 4.86). Most species are assigned to the second trophic level (primary consumers), fewer species are grouped in the third trophic level (secondary consumers), and benthic top predators are the least numerous. Most species cluster primarily at the lowest trophic level that is consistent with the typical organization of pyramidal food webs. Food chain length increases with biodiversity, highlighting a positive effect of more complex community structure on food web organisation. In more diverse benthic communities, energy is transferred through more trophic levels while species-poor communities sustain a shorter food chain.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:12697
Deposited On:08 Oct 2012 09:48
Last Modified:22 Aug 2013 11:54

Repository Staff Only: item control page