Body size and vigilance mediate asymmetric interference competition for food in fish larvae
Interference competition for food is difficult to measure because feeding rates altered by behavioral interactions of competitors are confounded by exploitative competition, the depletion of food over time. We quantified the magnitude of interference competition between individuals using a combinati...
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fthighwire:oai:open-archive.highwire.org:beheco:21/4/708 2023-05-15T18:06:08+02:00 Body size and vigilance mediate asymmetric interference competition for food in fish larvae Nakayama, Shinnosuke Fuiman, Lee A. 2010-07-01 00:00:00.0 text/html http://beheco.oxfordjournals.org/cgi/content/short/21/4/708 https://doi.org/10.1093/beheco/arq043 en eng Oxford University Press http://beheco.oxfordjournals.org/cgi/content/short/21/4/708 http://dx.doi.org/10.1093/beheco/arq043 Copyright (C) 2010, International Society for Behavioral Ecology ORIGINAL ARTICLES TEXT 2010 fthighwire https://doi.org/10.1093/beheco/arq043 2016-11-16T17:38:52Z Interference competition for food is difficult to measure because feeding rates altered by behavioral interactions of competitors are confounded by exploitative competition, the depletion of food over time. We quantified the magnitude of interference competition between individuals using a combination of experiments and computer simulations, which allowed us to remove the effect of exploitative competition. We used this approach to test the hypothesis that interference competition reduces feeding rates of young red drum ( Sciaenops ocellatus ) and that the magnitude of interference competition is related to phenotypic traits, such as the sizes of competitors and behavioral interactions between them. In laboratory experiments, we measured prey consumption and behavioral interactions between 2 fish of different sizes (7- to 25-mm standard length). We used computer simulations to remove the effects of exploitative competition and found that prey consumed by focal individuals decreased in the presence of competitors due to interference competition and that the decrease was stronger when focal individuals were smaller than competitors and when the competing individuals were generally larger. We also found greater impairment of prey consumption by focal individuals when they were more vigilant (more reactive) to the presence of competitors. A better understanding of the magnitude of asymmetry in interference competition has important implications for understanding population dynamics, spatial distribution, and reproductive strategies of many organisms. This is the first study to quantify the asymmetry in interference competition when prey density changes over time. Text Red drum Sciaenops ocellatus HighWire Press (Stanford University) Behavioral Ecology 21 4 708 713 |
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HighWire Press (Stanford University) |
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English |
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ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Nakayama, Shinnosuke Fuiman, Lee A. Body size and vigilance mediate asymmetric interference competition for food in fish larvae |
topic_facet |
ORIGINAL ARTICLES |
description |
Interference competition for food is difficult to measure because feeding rates altered by behavioral interactions of competitors are confounded by exploitative competition, the depletion of food over time. We quantified the magnitude of interference competition between individuals using a combination of experiments and computer simulations, which allowed us to remove the effect of exploitative competition. We used this approach to test the hypothesis that interference competition reduces feeding rates of young red drum ( Sciaenops ocellatus ) and that the magnitude of interference competition is related to phenotypic traits, such as the sizes of competitors and behavioral interactions between them. In laboratory experiments, we measured prey consumption and behavioral interactions between 2 fish of different sizes (7- to 25-mm standard length). We used computer simulations to remove the effects of exploitative competition and found that prey consumed by focal individuals decreased in the presence of competitors due to interference competition and that the decrease was stronger when focal individuals were smaller than competitors and when the competing individuals were generally larger. We also found greater impairment of prey consumption by focal individuals when they were more vigilant (more reactive) to the presence of competitors. A better understanding of the magnitude of asymmetry in interference competition has important implications for understanding population dynamics, spatial distribution, and reproductive strategies of many organisms. This is the first study to quantify the asymmetry in interference competition when prey density changes over time. |
format |
Text |
author |
Nakayama, Shinnosuke Fuiman, Lee A. |
author_facet |
Nakayama, Shinnosuke Fuiman, Lee A. |
author_sort |
Nakayama, Shinnosuke |
title |
Body size and vigilance mediate asymmetric interference competition for food in fish larvae |
title_short |
Body size and vigilance mediate asymmetric interference competition for food in fish larvae |
title_full |
Body size and vigilance mediate asymmetric interference competition for food in fish larvae |
title_fullStr |
Body size and vigilance mediate asymmetric interference competition for food in fish larvae |
title_full_unstemmed |
Body size and vigilance mediate asymmetric interference competition for food in fish larvae |
title_sort |
body size and vigilance mediate asymmetric interference competition for food in fish larvae |
publisher |
Oxford University Press |
publishDate |
2010 |
url |
http://beheco.oxfordjournals.org/cgi/content/short/21/4/708 https://doi.org/10.1093/beheco/arq043 |
genre |
Red drum Sciaenops ocellatus |
genre_facet |
Red drum Sciaenops ocellatus |
op_relation |
http://beheco.oxfordjournals.org/cgi/content/short/21/4/708 http://dx.doi.org/10.1093/beheco/arq043 |
op_rights |
Copyright (C) 2010, International Society for Behavioral Ecology |
op_doi |
https://doi.org/10.1093/beheco/arq043 |
container_title |
Behavioral Ecology |
container_volume |
21 |
container_issue |
4 |
container_start_page |
708 |
op_container_end_page |
713 |
_version_ |
1766177708961693696 |