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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
28/12/2016 |
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Data da última atualização: |
11/07/2017 |
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Autoria: |
LESNOFF, M. |
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Título: |
Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal): a periodic matrix model. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Agricultural Systems, v. 61 n. 3, p. 207-221, Sep. 1999. |
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DOI: |
dx.doi.org/10.1016/S0308-521X(99)00053-0 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The demography of livestock populations in Sahelian areas is highly sensitive to periodic stresses generated by climatic fluctuations. A deterministic age-transition matrix model which explicitly accounts for within-year demographic variability was developed. The annual cycle was divided into a number of 24 two-week phases and the annual projection matrix was the product of the 24 projection matrices for each phase. This model was applied to an extensively managed sheep population in North Senegal. Results such as growth rates, age structures and population size projections were compared to field data. We showed that such models can be useful in exploring demographic patterns and thus be powerful descriptive tools for livestock dynamic analysis in periodic environmental variations. |
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Palavras-Chave: |
Matrix model; Periodic environment. |
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Thesagro: |
Demografia; Dinâmica populacional; Modelo de simulação; Ovino. |
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Thesaurus Nal: |
Demography; Population dynamics; Sheep; Simulation models. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
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024 7 $adx.doi.org/10.1016/S0308-521X(99)00053-0$2DOI
100 1 $aLESNOFF, M.
245 $aDynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal)$ba periodic matrix model.
260 $c1999
520 $aAbstract: The demography of livestock populations in Sahelian areas is highly sensitive to periodic stresses generated by climatic fluctuations. A deterministic age-transition matrix model which explicitly accounts for within-year demographic variability was developed. The annual cycle was divided into a number of 24 two-week phases and the annual projection matrix was the product of the 24 projection matrices for each phase. This model was applied to an extensively managed sheep population in North Senegal. Results such as growth rates, age structures and population size projections were compared to field data. We showed that such models can be useful in exploring demographic patterns and thus be powerful descriptive tools for livestock dynamic analysis in periodic environmental variations.
650 $aDemography
650 $aPopulation dynamics
650 $aSheep
650 $aSimulation models
650 $aDemografia
650 $aDinâmica populacional
650 $aModelo de simulação
650 $aOvino
653 $aMatrix model
653 $aPeriodic environment
773 $tAgricultural Systems$gv. 61 n. 3, p. 207-221, Sep. 1999.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
