Mapping the spatiotemporal distributions of the Desert Locust in Mauritania and Morocco to improve preventive management

Piou Cyril, El Hacen Jaavar Mohamed, Babah Ebbe Mohamed Abdallahi Ould, Chihrane Jamal, Ghaout Saïd, Cissé Sory, Lecoq Michel, Ben Halima Thami. 2017. Mapping the spatiotemporal distributions of the Desert Locust in Mauritania and Morocco to improve preventive management. Basic and Applied Ecology, 25 : 37-47.

https://doi.org/10.1016/j.baae.2017.10.002

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Q2, Sujet : ECOLOGY

Résumé : Understanding Desert Locust population dynamics is a prerequisite for the implementation of a preventive management strategy against its invasions. The present study aims to describe these dynamics through conducting probability analyses of locust presence in time and space. Historical data from field surveys conducted by management teams in Mauritania and Morocco for the period 1988–2015 were used. Temporal smoothing and spatio-temporal extrapolations were performed on a monthly basis. We established monthly probability maps of locust observation following two scenarios: recession period (mainly solitarious phase) and invasion period (mainly gregarious phase). Also, observation probability maps of hoppers or mature adults allowed the identification of seasonal breeding areas. The methodology highlights the potentially favourable areas to be monitored every year. It also highlights the lack of information in some areas of the two countries. We observed that the seasonal survey process during recession periods follow the seasonal pattern of gregarious invasions. We argue that this is the result of climatic conditions related to the oscillation of the intertropical convergence zone. However, we advise that these similar yearly cycles should not hinder surveys in recession periods to be conducted in places not receiving swarms during invasion periods. Nevertheless, we conclude that these maps should be helpful for planning the preparation of survey teams in the field. This will reduce survey operation costs and decrease invasion risks.

Mots-clés Agrovoc : Schistocerca gregaria, distribution géographique, surveillance des déprédateurs, cartographie, dynamique des populations, biotope, gestion du risque, modèle mathématique, stade de développement animal

Mots-clés géographiques Agrovoc : Mauritanie, Maroc

Mots-clés libres : Schistocerca gregaria, Historical data, Spatial smoothing analysis, Biotope, Phase polyphenism

Classification Agris : H10 - Ravageurs des plantes
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

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