Species versus guild level differentiation revealed across the annual cycle by isotopic niche examination
Interspecific competitive interactions typically result in niche differentiation to alleviate competition through mechanisms including character displacement. However, competition is not the sole constraint on resource partitioning, and its effects are mediated by factors including the environmental...
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Veröffentlicht in: | The Journal of animal ecology 2014-03, Vol.83 (2), p.470-478 |
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creator | Bodey, Thomas W Ward, Eric J Phillips, Richard A McGill, Rona A. R Bearhop, Stuart Wunder, Michael |
description | Interspecific competitive interactions typically result in niche differentiation to alleviate competition through mechanisms including character displacement. However, competition is not the sole constraint on resource partitioning, and its effects are mediated by factors including the environmental context in which species coexist. Colonial seabirds provide an excellent opportunity to investigate the importance of competition in shaping realized niche widths because their life histories lead to variation in intra‐ and interspecific competition across the annual cycle. Dense breeding aggregations result in intense competition for prey in surrounding waters, whereas non‐breeding dispersal to larger geographical areas produces lower densities of competitors. Bayesian hierarchical models of the isotopic niche, closely aligned to the trophic niche, reveal the degree of segregation between species and functional groups during both time periods. Surprisingly, species explained far more of the variance in the isotopic niche during the non‐breeding than the breeding period. Our results underline the key role of non‐breeding dynamics in alleviating competition and promoting distinctions between species through the facilitation of resource partitioning. Such situations may be common in a diverse range of communities sustained by ephemeral but abundant food items. This highlights how consideration of the hierarchical grouping of competitive interactions alongside consideration of abiotic constraints across the complete annual cycle allows a full understanding of the role of competition in driving patterns of character displacement. |
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R ; Bearhop, Stuart ; Wunder, Michael</creator><contributor>Wunder, Michael</contributor><creatorcontrib>Bodey, Thomas W ; Ward, Eric J ; Phillips, Richard A ; McGill, Rona A. R ; Bearhop, Stuart ; Wunder, Michael ; Wunder, Michael</creatorcontrib><description>Interspecific competitive interactions typically result in niche differentiation to alleviate competition through mechanisms including character displacement. However, competition is not the sole constraint on resource partitioning, and its effects are mediated by factors including the environmental context in which species coexist. Colonial seabirds provide an excellent opportunity to investigate the importance of competition in shaping realized niche widths because their life histories lead to variation in intra‐ and interspecific competition across the annual cycle. Dense breeding aggregations result in intense competition for prey in surrounding waters, whereas non‐breeding dispersal to larger geographical areas produces lower densities of competitors. Bayesian hierarchical models of the isotopic niche, closely aligned to the trophic niche, reveal the degree of segregation between species and functional groups during both time periods. Surprisingly, species explained far more of the variance in the isotopic niche during the non‐breeding than the breeding period. Our results underline the key role of non‐breeding dynamics in alleviating competition and promoting distinctions between species through the facilitation of resource partitioning. Such situations may be common in a diverse range of communities sustained by ephemeral but abundant food items. This highlights how consideration of the hierarchical grouping of competitive interactions alongside consideration of abiotic constraints across the complete annual cycle allows a full understanding of the role of competition in driving patterns of character displacement.</description><identifier>ISSN: 0021-8790</identifier><identifier>EISSN: 1365-2656</identifier><identifier>DOI: 10.1111/1365-2656.12156</identifier><identifier>PMID: 24215391</identifier><identifier>CODEN: JAECAP</identifier><language>eng</language><publisher>Oxford: John Wiley & Sons Ltd</publisher><subject>Animal and plant ecology ; Animal behavior ; Animal ecology ; Animal, plant and microbial ecology ; Animals ; Atlantic Islands ; Autoecology ; Aves ; Bayes Theorem ; Biological and medical sciences ; Birds - physiology ; Breeding ; Carbon Isotopes - blood ; Carbon Isotopes - metabolism ; character displacement ; Community ecology ; Competition ; Competitive Behavior ; diet ; Ecological niches ; Ecology ; Feathers - chemistry ; Feeding Behavior ; Female ; foods ; Foraging ; Functional groups ; Fundamental and applied biological sciences. Psychology ; General aspects ; Human ecology ; interspecific competition ; Male ; Marine ecology ; Mass Spectrometry ; Models, Biological ; Nitrogen Isotopes - blood ; Nitrogen Isotopes - metabolism ; Petrels ; procellariiform ; Reproduction ; resource partitioning ; Sea birds ; seabird ; seabirds ; speciation ; Species Specificity ; stable isotope ; Synecology ; variance ; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution</subject><ispartof>The Journal of animal ecology, 2014-03, Vol.83 (2), p.470-478</ispartof><rights>2014 British Ecological Society</rights><rights>2013 The Authors. Journal of Animal Ecology © 2013 British Ecological Society</rights><rights>2015 INIST-CNRS</rights><rights>2013 The Authors. 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R</creatorcontrib><creatorcontrib>Bearhop, Stuart</creatorcontrib><creatorcontrib>Wunder, Michael</creatorcontrib><title>Species versus guild level differentiation revealed across the annual cycle by isotopic niche examination</title><title>The Journal of animal ecology</title><addtitle>J Anim Ecol</addtitle><description>Interspecific competitive interactions typically result in niche differentiation to alleviate competition through mechanisms including character displacement. However, competition is not the sole constraint on resource partitioning, and its effects are mediated by factors including the environmental context in which species coexist. Colonial seabirds provide an excellent opportunity to investigate the importance of competition in shaping realized niche widths because their life histories lead to variation in intra‐ and interspecific competition across the annual cycle. Dense breeding aggregations result in intense competition for prey in surrounding waters, whereas non‐breeding dispersal to larger geographical areas produces lower densities of competitors. Bayesian hierarchical models of the isotopic niche, closely aligned to the trophic niche, reveal the degree of segregation between species and functional groups during both time periods. Surprisingly, species explained far more of the variance in the isotopic niche during the non‐breeding than the breeding period. Our results underline the key role of non‐breeding dynamics in alleviating competition and promoting distinctions between species through the facilitation of resource partitioning. Such situations may be common in a diverse range of communities sustained by ephemeral but abundant food items. This highlights how consideration of the hierarchical grouping of competitive interactions alongside consideration of abiotic constraints across the complete annual cycle allows a full understanding of the role of competition in driving patterns of character displacement.</description><subject>Animal and plant ecology</subject><subject>Animal behavior</subject><subject>Animal ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Animals</subject><subject>Atlantic Islands</subject><subject>Autoecology</subject><subject>Aves</subject><subject>Bayes Theorem</subject><subject>Biological and medical sciences</subject><subject>Birds - physiology</subject><subject>Breeding</subject><subject>Carbon Isotopes - blood</subject><subject>Carbon Isotopes - metabolism</subject><subject>character displacement</subject><subject>Community ecology</subject><subject>Competition</subject><subject>Competitive Behavior</subject><subject>diet</subject><subject>Ecological niches</subject><subject>Ecology</subject><subject>Feathers - chemistry</subject><subject>Feeding Behavior</subject><subject>Female</subject><subject>foods</subject><subject>Foraging</subject><subject>Functional groups</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>General aspects</subject><subject>Human ecology</subject><subject>interspecific competition</subject><subject>Male</subject><subject>Marine ecology</subject><subject>Mass Spectrometry</subject><subject>Models, Biological</subject><subject>Nitrogen Isotopes - blood</subject><subject>Nitrogen Isotopes - metabolism</subject><subject>Petrels</subject><subject>procellariiform</subject><subject>Reproduction</subject><subject>resource partitioning</subject><subject>Sea birds</subject><subject>seabird</subject><subject>seabirds</subject><subject>speciation</subject><subject>Species Specificity</subject><subject>stable isotope</subject><subject>Synecology</subject><subject>variance</subject><subject>Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution</subject><issn>0021-8790</issn><issn>1365-2656</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkk1v1DAQhi0EokvhzAmwhJC4bDv-iJMcq6p8qYJDy9maOJPilTdZ7KRl_z3ezbYgLvhiaeZ5Z8bvmLGXAk5EPqdCmWIpTWFOhBSFecQWD5HHbAEgxbIqazhiz1JaAUApQT1lR1JnWtViwfzVhpynxG8ppinxm8mHlge6pcBb33UUqR89jn7oecxRDNRydHFIiY8_iGPfTxi427pAvNlyn4Zx2HjHe-9ymn7h2vd7-XP2pMOQ6MXhPmbXHy6uzz8tL799_Hx-drl0uqrNsnTUqto4bIuuMlA40SDogrAty7prqcESEcpSK1EacNiUje4qUiQcqEqrY_Z-LruJw8-J0mjXPjkKAXsapmSFqYyGWhYio2__QVfDFPs8nBUFgABZKZWp05naPzpSZzfRrzFurQC7W4LdWW53ltv9ErLi9aHu1KypfeDvXc_AuwOAyWHoIvbOpz9cJaUxqs6cmbk7H2j7v772y9nXi_sJXs3CVRqH-NcAoLQRkPNv5nyHg8WbmJt_v5IgdP4ila6LWv0GwxGxuA</recordid><startdate>201403</startdate><enddate>201403</enddate><creator>Bodey, Thomas W</creator><creator>Ward, Eric J</creator><creator>Phillips, Richard A</creator><creator>McGill, Rona A. 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R</au><au>Bearhop, Stuart</au><au>Wunder, Michael</au><au>Wunder, Michael</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Species versus guild level differentiation revealed across the annual cycle by isotopic niche examination</atitle><jtitle>The Journal of animal ecology</jtitle><addtitle>J Anim Ecol</addtitle><date>2014-03</date><risdate>2014</risdate><volume>83</volume><issue>2</issue><spage>470</spage><epage>478</epage><pages>470-478</pages><issn>0021-8790</issn><eissn>1365-2656</eissn><coden>JAECAP</coden><abstract>Interspecific competitive interactions typically result in niche differentiation to alleviate competition through mechanisms including character displacement. However, competition is not the sole constraint on resource partitioning, and its effects are mediated by factors including the environmental context in which species coexist. Colonial seabirds provide an excellent opportunity to investigate the importance of competition in shaping realized niche widths because their life histories lead to variation in intra‐ and interspecific competition across the annual cycle. Dense breeding aggregations result in intense competition for prey in surrounding waters, whereas non‐breeding dispersal to larger geographical areas produces lower densities of competitors. Bayesian hierarchical models of the isotopic niche, closely aligned to the trophic niche, reveal the degree of segregation between species and functional groups during both time periods. Surprisingly, species explained far more of the variance in the isotopic niche during the non‐breeding than the breeding period. Our results underline the key role of non‐breeding dynamics in alleviating competition and promoting distinctions between species through the facilitation of resource partitioning. 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subjects | Animal and plant ecology Animal behavior Animal ecology Animal, plant and microbial ecology Animals Atlantic Islands Autoecology Aves Bayes Theorem Biological and medical sciences Birds - physiology Breeding Carbon Isotopes - blood Carbon Isotopes - metabolism character displacement Community ecology Competition Competitive Behavior diet Ecological niches Ecology Feathers - chemistry Feeding Behavior Female foods Foraging Functional groups Fundamental and applied biological sciences. Psychology General aspects Human ecology interspecific competition Male Marine ecology Mass Spectrometry Models, Biological Nitrogen Isotopes - blood Nitrogen Isotopes - metabolism Petrels procellariiform Reproduction resource partitioning Sea birds seabird seabirds speciation Species Specificity stable isotope Synecology variance Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution |
title | Species versus guild level differentiation revealed across the annual cycle by isotopic niche examination |
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