Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania
In the desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae), the threshold density inducing the gregarization phenomenon has never been determined under natural conditions. The influence of environmental factors on this phenomenon has been studied mostly in controlled environments. Based on data collected during several years by the survey teams of the National Center for Locust Control in Mauritania, we analyzed the influence of locust density, vegetation cover, and vegetation status on the probability of observing gregarious locusts. We assumed that a probability to observe gregarious locusts of 0.5 corresponded to the density threshold of gregarization. The results showed in detail the change in the threshold of gregarization according to the cover and status of the vegetation. Low cover and dry vegetation led to a low density threshold of gregarization probably due to high probability of individuals to touch each other. Dense and green vegetation favored a high threshold of gregarization probably due to a dispersion of the individuals and a low probability of individual encounters. These findings should help the management of locusts and decision making during control operations.
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Subjects: | H10 - Ravageurs des plantes, Schistocerca gregaria, écologie animale, comportement, végétation, densité de population, http://aims.fao.org/aos/agrovoc/c_31931, http://aims.fao.org/aos/agrovoc/c_427, http://aims.fao.org/aos/agrovoc/c_868, http://aims.fao.org/aos/agrovoc/c_8176, http://aims.fao.org/aos/agrovoc/c_6112, http://aims.fao.org/aos/agrovoc/c_4660, |
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dig-cirad-fr-5708022024-01-28T21:40:28Z http://agritrop.cirad.fr/570802/ http://agritrop.cirad.fr/570802/ Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania. Cissé Sory, Ghaout Saïd, Mazih Ahmed, Ould Babah Mohamed A., Benahi Ahmed Salem, Piou Cyril. 2013. Entomologia Experimentalis et Applicata, 149 (2) : 159-165.https://doi.org/10.1111/eea.12121 <https://doi.org/10.1111/eea.12121> Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania Cissé, Sory Ghaout, Saïd Mazih, Ahmed Ould Babah, Mohamed A. Benahi, Ahmed Salem Piou, Cyril eng 2013 Entomologia Experimentalis et Applicata H10 - Ravageurs des plantes Schistocerca gregaria écologie animale comportement végétation densité de population http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_427 http://aims.fao.org/aos/agrovoc/c_868 http://aims.fao.org/aos/agrovoc/c_8176 http://aims.fao.org/aos/agrovoc/c_6112 Mauritanie http://aims.fao.org/aos/agrovoc/c_4660 In the desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae), the threshold density inducing the gregarization phenomenon has never been determined under natural conditions. The influence of environmental factors on this phenomenon has been studied mostly in controlled environments. Based on data collected during several years by the survey teams of the National Center for Locust Control in Mauritania, we analyzed the influence of locust density, vegetation cover, and vegetation status on the probability of observing gregarious locusts. We assumed that a probability to observe gregarious locusts of 0.5 corresponded to the density threshold of gregarization. The results showed in detail the change in the threshold of gregarization according to the cover and status of the vegetation. Low cover and dry vegetation led to a low density threshold of gregarization probably due to high probability of individuals to touch each other. Dense and green vegetation favored a high threshold of gregarization probably due to a dispersion of the individuals and a low probability of individual encounters. These findings should help the management of locusts and decision making during control operations. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/570802/1/document_570802.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1111/eea.12121 10.1111/eea.12121 info:eu-repo/semantics/altIdentifier/doi/10.1111/eea.12121 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1111/eea.12121 |
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H10 - Ravageurs des plantes Schistocerca gregaria écologie animale comportement végétation densité de population http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_427 http://aims.fao.org/aos/agrovoc/c_868 http://aims.fao.org/aos/agrovoc/c_8176 http://aims.fao.org/aos/agrovoc/c_6112 http://aims.fao.org/aos/agrovoc/c_4660 H10 - Ravageurs des plantes Schistocerca gregaria écologie animale comportement végétation densité de population http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_427 http://aims.fao.org/aos/agrovoc/c_868 http://aims.fao.org/aos/agrovoc/c_8176 http://aims.fao.org/aos/agrovoc/c_6112 http://aims.fao.org/aos/agrovoc/c_4660 |
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H10 - Ravageurs des plantes Schistocerca gregaria écologie animale comportement végétation densité de population http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_427 http://aims.fao.org/aos/agrovoc/c_868 http://aims.fao.org/aos/agrovoc/c_8176 http://aims.fao.org/aos/agrovoc/c_6112 http://aims.fao.org/aos/agrovoc/c_4660 H10 - Ravageurs des plantes Schistocerca gregaria écologie animale comportement végétation densité de population http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_427 http://aims.fao.org/aos/agrovoc/c_868 http://aims.fao.org/aos/agrovoc/c_8176 http://aims.fao.org/aos/agrovoc/c_6112 http://aims.fao.org/aos/agrovoc/c_4660 Cissé, Sory Ghaout, Saïd Mazih, Ahmed Ould Babah, Mohamed A. Benahi, Ahmed Salem Piou, Cyril Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania |
description |
In the desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae), the threshold density inducing the gregarization phenomenon has never been determined under natural conditions. The influence of environmental factors on this phenomenon has been studied mostly in controlled environments. Based on data collected during several years by the survey teams of the National Center for Locust Control in Mauritania, we analyzed the influence of locust density, vegetation cover, and vegetation status on the probability of observing gregarious locusts. We assumed that a probability to observe gregarious locusts of 0.5 corresponded to the density threshold of gregarization. The results showed in detail the change in the threshold of gregarization according to the cover and status of the vegetation. Low cover and dry vegetation led to a low density threshold of gregarization probably due to high probability of individuals to touch each other. Dense and green vegetation favored a high threshold of gregarization probably due to a dispersion of the individuals and a low probability of individual encounters. These findings should help the management of locusts and decision making during control operations. |
format |
article |
topic_facet |
H10 - Ravageurs des plantes Schistocerca gregaria écologie animale comportement végétation densité de population http://aims.fao.org/aos/agrovoc/c_31931 http://aims.fao.org/aos/agrovoc/c_427 http://aims.fao.org/aos/agrovoc/c_868 http://aims.fao.org/aos/agrovoc/c_8176 http://aims.fao.org/aos/agrovoc/c_6112 http://aims.fao.org/aos/agrovoc/c_4660 |
author |
Cissé, Sory Ghaout, Saïd Mazih, Ahmed Ould Babah, Mohamed A. Benahi, Ahmed Salem Piou, Cyril |
author_facet |
Cissé, Sory Ghaout, Saïd Mazih, Ahmed Ould Babah, Mohamed A. Benahi, Ahmed Salem Piou, Cyril |
author_sort |
Cissé, Sory |
title |
Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania |
title_short |
Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania |
title_full |
Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania |
title_fullStr |
Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania |
title_full_unstemmed |
Effect of vegetation on density thresholds of adult desert locust gregarization from survey data in Mauritania |
title_sort |
effect of vegetation on density thresholds of adult desert locust gregarization from survey data in mauritania |
url |
http://agritrop.cirad.fr/570802/ http://agritrop.cirad.fr/570802/1/document_570802.pdf |
work_keys_str_mv |
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_version_ |
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