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• W2000997078 abstract "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 210:185-193 (2001) - doi:10.3354/meps210185 Intraspecific food competition in the deposit-feeding benthic amphipod Monoporeia affinis‹ a laboratory study Ragnar Elmgren1,*, Gunilla Ejdung1, Sven Ankar2,** 1Department of Systems Ecology and 2Askö Laboratory, Stockholm University, 106 91 Stockholm, Sweden *E-mail: ragnar_e@system.ecology.su.se **Present address: Pl. 52053 Starbo, 752 63 Uppsala, Sweden ABSTRACT: Field studies in the Baltic Sea indicate that the growth rate of the deposit-feeding benthic amphipod Monoporeia affinis (Lindström), which is found in densities of up to ≅25000 ind. m-2, is negatively density-dependent. We tested the density-dependence of growth in M. affinis under controlled laboratory conditions, using sediment of high organic content (loss on ignition 10.9%) and a wide density range of 2 amphipod year-classes (juveniles, 1150 to 38000 ind. m-2, 1 yr old subadults, 580 to 18000 ind. m-2). Growth was strongly negatively density-dependent for both juveniles and subadults. We then used sediment of low organic content (loss on ignition 3.7%) to test whether the density-dependence of growth was due to a direct crowding effect at high density, or mainly due to food limitation. Using an intermediate amphipod density (2800 ind. m-2) expected to give clear growth depression, we added baker¹s yeast as supplementary food at 6 levels corresponding to an input of 0 (control) to 147 g C m-2 over an 8 wk period. The 3 highest yeast additions resulted in black, reduced sediment and elevated amphipod mortality in some replicates, but where the sediment did not become reduced, food additions enhanced growth significantly, demonstrating that growth depression at high density was primarily due to food limitation and not to crowding as such. KEY WORDS: Baltic Sea · Deposit-feeder · Macrobenthos · Food limitation · Intraspecific competition · Monoporeia affinis Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 210. Online publication date: January 26, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research." @default.
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• W2000997078 title "Intraspecific food competition in the deposit-feeding benthic amphipod Monoporeia affinis-a laboratory study" @default.
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