Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model
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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Subjects: | U10 - Informatique, mathématiques et statistiques, démographie, environnement, modèle de simulation, caprin, ovin, stress thermique, http://aims.fao.org/aos/agrovoc/c_10328, http://aims.fao.org/aos/agrovoc/c_2593, http://aims.fao.org/aos/agrovoc/c_24242, http://aims.fao.org/aos/agrovoc/c_3324, http://aims.fao.org/aos/agrovoc/c_7030, http://aims.fao.org/aos/agrovoc/c_11488, http://aims.fao.org/aos/agrovoc/c_6970, |
Online Access: | http://agritrop.cirad.fr/391837/ http://agritrop.cirad.fr/391837/1/391837.pdf |
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dig-cirad-fr-3918372024-01-27T23:51:32Z http://agritrop.cirad.fr/391837/ http://agritrop.cirad.fr/391837/ Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model. Lesnoff Matthieu. 1999. Agricultural Systems, 61 (3) : 207-221.https://doi.org/10.1016/S0308-521X(99)00053-0 <https://doi.org/10.1016/S0308-521X(99)00053-0> Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model Lesnoff, Matthieu eng 1999 Agricultural Systems U10 - Informatique, mathématiques et statistiques démographie environnement modèle de simulation caprin ovin stress thermique http://aims.fao.org/aos/agrovoc/c_10328 http://aims.fao.org/aos/agrovoc/c_2593 http://aims.fao.org/aos/agrovoc/c_24242 http://aims.fao.org/aos/agrovoc/c_3324 http://aims.fao.org/aos/agrovoc/c_7030 http://aims.fao.org/aos/agrovoc/c_11488 Sénégal http://aims.fao.org/aos/agrovoc/c_6970 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. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/391837/1/391837.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/S0308-521X(99)00053-0 10.1016/S0308-521X(99)00053-0 info:eu-repo/semantics/altIdentifier/doi/10.1016/S0308-521X(99)00053-0 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/S0308-521X(99)00053-0 |
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U10 - Informatique, mathématiques et statistiques démographie environnement modèle de simulation caprin ovin stress thermique http://aims.fao.org/aos/agrovoc/c_10328 http://aims.fao.org/aos/agrovoc/c_2593 http://aims.fao.org/aos/agrovoc/c_24242 http://aims.fao.org/aos/agrovoc/c_3324 http://aims.fao.org/aos/agrovoc/c_7030 http://aims.fao.org/aos/agrovoc/c_11488 http://aims.fao.org/aos/agrovoc/c_6970 U10 - Informatique, mathématiques et statistiques démographie environnement modèle de simulation caprin ovin stress thermique http://aims.fao.org/aos/agrovoc/c_10328 http://aims.fao.org/aos/agrovoc/c_2593 http://aims.fao.org/aos/agrovoc/c_24242 http://aims.fao.org/aos/agrovoc/c_3324 http://aims.fao.org/aos/agrovoc/c_7030 http://aims.fao.org/aos/agrovoc/c_11488 http://aims.fao.org/aos/agrovoc/c_6970 |
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U10 - Informatique, mathématiques et statistiques démographie environnement modèle de simulation caprin ovin stress thermique http://aims.fao.org/aos/agrovoc/c_10328 http://aims.fao.org/aos/agrovoc/c_2593 http://aims.fao.org/aos/agrovoc/c_24242 http://aims.fao.org/aos/agrovoc/c_3324 http://aims.fao.org/aos/agrovoc/c_7030 http://aims.fao.org/aos/agrovoc/c_11488 http://aims.fao.org/aos/agrovoc/c_6970 U10 - Informatique, mathématiques et statistiques démographie environnement modèle de simulation caprin ovin stress thermique http://aims.fao.org/aos/agrovoc/c_10328 http://aims.fao.org/aos/agrovoc/c_2593 http://aims.fao.org/aos/agrovoc/c_24242 http://aims.fao.org/aos/agrovoc/c_3324 http://aims.fao.org/aos/agrovoc/c_7030 http://aims.fao.org/aos/agrovoc/c_11488 http://aims.fao.org/aos/agrovoc/c_6970 Lesnoff, Matthieu Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model |
description |
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. |
format |
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U10 - Informatique, mathématiques et statistiques démographie environnement modèle de simulation caprin ovin stress thermique http://aims.fao.org/aos/agrovoc/c_10328 http://aims.fao.org/aos/agrovoc/c_2593 http://aims.fao.org/aos/agrovoc/c_24242 http://aims.fao.org/aos/agrovoc/c_3324 http://aims.fao.org/aos/agrovoc/c_7030 http://aims.fao.org/aos/agrovoc/c_11488 http://aims.fao.org/aos/agrovoc/c_6970 |
author |
Lesnoff, Matthieu |
author_facet |
Lesnoff, Matthieu |
author_sort |
Lesnoff, Matthieu |
title |
Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model |
title_short |
Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model |
title_full |
Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model |
title_fullStr |
Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model |
title_full_unstemmed |
Dynamics of a sheep population in a Sahelian area (Ndiagne district in Senegal) : a periodic matrix model |
title_sort |
dynamics of a sheep population in a sahelian area (ndiagne district in senegal) : a periodic matrix model |
url |
http://agritrop.cirad.fr/391837/ http://agritrop.cirad.fr/391837/1/391837.pdf |
work_keys_str_mv |
AT lesnoffmatthieu dynamicsofasheeppopulationinasahelianareandiagnedistrictinsenegalaperiodicmatrixmodel |
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1792491534596177920 |