Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs (Nomadacris septemfasciata Serv.) in Madagascar
Pigmentation of the Red locust hopper, Nomadacris septemfasciata Serv., was studied in natural conditions in Madagascar in relation to population density. More than one thousand hoppers were collected and described according to a semiquantitative method. A typology is proposed, strictly reflecting t...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | Psyche: A Journal of Entomology |
| Online Access: | http://dx.doi.org/10.1155/2011/105352 |
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| author | Michel Lecoq Abdou Chamouine My-Hanh Luong-Skovmand |
| author_facet | Michel Lecoq Abdou Chamouine My-Hanh Luong-Skovmand |
| author_sort | Michel Lecoq |
| collection | DOAJ |
| description | Pigmentation of the Red locust hopper, Nomadacris septemfasciata Serv., was studied in natural conditions in Madagascar in relation to population density. More than one thousand hoppers were collected and described according to a semiquantitative method. A typology is proposed, strictly reflecting the increase in population densities. This correctly translated the progressive evolution of a solitary state into a gregarious state, while passing through several intermediate transiens stages. According to their density, hopper populations consist of a mixture, in various proportions, of several pigment types. The gregarization threshold is estimated at 100,000 hoppers/ha. A slight black spot on the hind femur is the first sign of gregarization. These results should improve the reliability of the information collected by the Malagasy National locust centre when surveying this major pest. They question the rapidity of the gregarization process in natural conditions as well as the stimuli involved. |
| format | Article |
| id | doaj-art-99836cd3ca8a42b991c9a88e792a8021 |
| institution | Kabale University |
| issn | 0033-2615 1687-7438 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Psyche: A Journal of Entomology |
| spelling | doaj-art-99836cd3ca8a42b991c9a88e792a80212025-02-03T06:10:50ZengWileyPsyche: A Journal of Entomology0033-26151687-74382011-01-01201110.1155/2011/105352105352Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs (Nomadacris septemfasciata Serv.) in MadagascarMichel Lecoq0Abdou Chamouine1My-Hanh Luong-Skovmand2Cirad Acridologie, 34398 Montpellier, FranceUniversité de Toliara, BP 185, Toliara 601, MadagascarCirad Acridologie, 34398 Montpellier, FrancePigmentation of the Red locust hopper, Nomadacris septemfasciata Serv., was studied in natural conditions in Madagascar in relation to population density. More than one thousand hoppers were collected and described according to a semiquantitative method. A typology is proposed, strictly reflecting the increase in population densities. This correctly translated the progressive evolution of a solitary state into a gregarious state, while passing through several intermediate transiens stages. According to their density, hopper populations consist of a mixture, in various proportions, of several pigment types. The gregarization threshold is estimated at 100,000 hoppers/ha. A slight black spot on the hind femur is the first sign of gregarization. These results should improve the reliability of the information collected by the Malagasy National locust centre when surveying this major pest. They question the rapidity of the gregarization process in natural conditions as well as the stimuli involved.http://dx.doi.org/10.1155/2011/105352 |
| spellingShingle | Michel Lecoq Abdou Chamouine My-Hanh Luong-Skovmand Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs (Nomadacris septemfasciata Serv.) in Madagascar Psyche: A Journal of Entomology |
| title | Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs
(Nomadacris septemfasciata Serv.) in Madagascar |
| title_full | Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs
(Nomadacris septemfasciata Serv.) in Madagascar |
| title_fullStr | Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs
(Nomadacris septemfasciata Serv.) in Madagascar |
| title_full_unstemmed | Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs
(Nomadacris septemfasciata Serv.) in Madagascar |
| title_short | Phase-Dependent Color Polyphenism in Field Populations of Red Locust Nymphs
(Nomadacris septemfasciata Serv.) in Madagascar |
| title_sort | phase dependent color polyphenism in field populations of red locust nymphs nomadacris septemfasciata serv in madagascar |
| url | http://dx.doi.org/10.1155/2011/105352 |
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