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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
19/02/1998 |
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Data da última atualização: |
27/03/2017 |
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Autoria: |
PIMM, S. L.; RICE, J. C. |
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Título: |
The dynamics of multispecies, multi-life-stage models of aquatic food webs. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
Theoretical Population Biology, v.32, p.303-325, 1987. |
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Idioma: |
Inglês |
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Conteúdo: |
We investigated the dynamics of models of aquatic food webs using stability analysis methods previously applied to other types of food web models. Our models expanded traditional Lotka-Volterra models of predator-prey interactions in several ways. We added life history structure to these models in order to investigate its effects. Life history omnivory is different life history stages of a species feeding in trophically different positions in a food web. Such a species might appear omnivourous, integrating across all stages, but the individual stage might not be. Other important additions to the basic models included stock-recruitment relationships between adults and young and food-dependent maturation rates for early life history stages. Complex models of multispecies interactions were built from basic ones by adding new features sequentially. Our analysis revealed five major features of our multispecies, multi-life-stage models. Omnivory reduces stability, as it does in food web models without life history structure. However, life history omnivory reduces stability much less than single life stage omnivory does. Stock recruitment relationships affect the likelihood of finding stable models. If the maturation rate of young varies with their food supply, the change of finding stable models decreases. Finally, predation loops of the type A eats B, B eats A, or A eats B, B eats C, C eats A greatly reduce model stability. We present both biological and mathematical explanations for these finding. We also discuss their implications for management of marine resources. MenosWe investigated the dynamics of models of aquatic food webs using stability analysis methods previously applied to other types of food web models. Our models expanded traditional Lotka-Volterra models of predator-prey interactions in several ways. We added life history structure to these models in order to investigate its effects. Life history omnivory is different life history stages of a species feeding in trophically different positions in a food web. Such a species might appear omnivourous, integrating across all stages, but the individual stage might not be. Other important additions to the basic models included stock-recruitment relationships between adults and young and food-dependent maturation rates for early life history stages. Complex models of multispecies interactions were built from basic ones by adding new features sequentially. Our analysis revealed five major features of our multispecies, multi-life-stage models. Omnivory reduces stability, as it does in food web models without life history structure. However, life history omnivory reduces stability much less than single life stage omnivory does. Stock recruitment relationships affect the likelihood of finding stable models. If the maturation rate of young varies with their food supply, the change of finding stable models decreases. Finally, predation loops of the type A eats B, B eats A, or A eats B, B eats C, C eats A greatly reduce model stability. We present both biological and mathematical explanations... Mostrar Tudo |
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Palavras-Chave: |
Aquatic species; Espe?cie aquatica. |
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Thesagro: |
Cadeia Alimentar. |
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Thesaurus Nal: |
food webs. |
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Categoria do assunto: |
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Marc: |
LEADER 02093naa a2200181 a 4500
001 1792113
005 2017-03-27
008 1987 bl --- 0-- u #d
100 1 $aPIMM, S. L.
245 $aThe dynamics of multispecies, multi-life-stage models of aquatic food webs.
260 $c1987
520 $aWe investigated the dynamics of models of aquatic food webs using stability analysis methods previously applied to other types of food web models. Our models expanded traditional Lotka-Volterra models of predator-prey interactions in several ways. We added life history structure to these models in order to investigate its effects. Life history omnivory is different life history stages of a species feeding in trophically different positions in a food web. Such a species might appear omnivourous, integrating across all stages, but the individual stage might not be. Other important additions to the basic models included stock-recruitment relationships between adults and young and food-dependent maturation rates for early life history stages. Complex models of multispecies interactions were built from basic ones by adding new features sequentially. Our analysis revealed five major features of our multispecies, multi-life-stage models. Omnivory reduces stability, as it does in food web models without life history structure. However, life history omnivory reduces stability much less than single life stage omnivory does. Stock recruitment relationships affect the likelihood of finding stable models. If the maturation rate of young varies with their food supply, the change of finding stable models decreases. Finally, predation loops of the type A eats B, B eats A, or A eats B, B eats C, C eats A greatly reduce model stability. We present both biological and mathematical explanations for these finding. We also discuss their implications for management of marine resources.
650 $afood webs
650 $aCadeia Alimentar
653 $aAquatic species
653 $aEspe?cie aquatica
700 1 $aRICE, J. C.
773 $tTheoretical Population Biology$gv.32, p.303-325, 1987.
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Registro original: |
Embrapa Pantanal (CPAP) |
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