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Phase polymorphism in the red locust, Nomadacris septemfasciata (Orthoptera: Acrididae) in Madagascar

Published online by Cambridge University Press:  28 February 2007

Alex Franc ,
Lalaina Rabesisoa ,
My Hanh Luong-Skovmand  and
Michel Lecoq
Alex Franc
Affiliation:
Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Campus International de Baillarguet, 34398, Montpellier, cedex 5, France
Lalaina Rabesisoa
Affiliation:
Centre National Antiacridien, BP 241, Tuléar, Madagascar
My Hanh Luong-Skovmand
Affiliation:
Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Campus International de Baillarguet, 34398, Montpellier, cedex 5, France
Michel Lecoq*
Affiliation:
Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Campus International de Baillarguet, 34398, Montpellier, cedex 5, France
*
*E-mail: [email protected]
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Abstract

Little is known about phase polymorphism in the red locust, Nomadacris septemfasciata (Serville) in Madagascar, despite its economic importance. Only solitary and transiens forms have been reported from the island earlier, but not the gregarious form. Important recent outbreaks have allowed for the studying of the phase polymorphism under experimental and field conditions. Morphometric differences (pronotum size and shape, and F/C and E/F ratios) were noted among hoppers and adults caged for several generations and at various densities, in a field laboratory. These criteria were later used to study adults collected in different areas between 1996 and 2002, from populations with various densities (<1000 to >25,000 imagos/ha). Morphometric measurements revealed that gregarious red locust populations have existed naturally in Madagascar and that these were erroneously classified as transiens forms. The upper threshold density for the solitary phase was estimated at 5000 adults/ha; beyond this limit, locusts develop either into transiens or into highly gregarious forms. The southern part of the island, known as a red locust outbreak area, has harboured gregarious phases despite previous reports that prevailing ecological conditions are not suitable for its complete phase transformation. Deforestation in the northern part of the island has probably led to new favourable biotopes for serious outbreaks and gregarious populations development.

Keywords

AcrididaelocustsNomadacris septemfasciatamorphometryphase polymorphismMadagascar
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 25 , Issue 3 , September 2005 , pp. 182 - 189
Copyright
Copyright © ICIPE 2005

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References

Bahana, J. W. (1999) Studies on the red locust, Nomadacris septemfasciata (Serville) (Acrididae: Cyrtacanthacridinae): Bibliography for the period 1940–1998. Insect Science and Its Application, 19, 377–397.Google Scholar
Brédo, H. J. (1938) Phases de Nomadacris septemfasciata Serv. au Congo Belge. C. R. Cinquième conférence internationale pour les recherches antiacridiennes: Bruxelles. Royavmede Belgique ministère des colonies, Bruxelles. Report 46, 406–409.Google Scholar
Burnett, G. F. (1951) Field observations of the behavior of the red locust ( Nomadacris septemfasciata Serville) in the solitary phase. Anti-Locust Bulletin, 8, 1–37.Google Scholar
Duranton, J.-F. (1997) Fléau acridien à Madagascar. Sécheresse, 8 2 138.Google Scholar
Frappa, C. (1935) Etude sur la sauterelle migratrice, Nomadacris septemfasciata Serv. et sa présence à Madagascar de 1926 à 1935. Bulletin Économique Tananarive, 3, 203–221.Google Scholar
Frappa, C. (1936) Observations nouvelles sur la biologie de Nomadacris septemfasciata Serv. à Madagascar. Bulletin de la Société d'Histoire Naturelle d'Afrique du Nord, 27, 326–358.Google Scholar
Frappa, C. (1947) La question acridienne à Madagascar. Agronomie Tropicale, 2 (3–4). 125–149.Google Scholar
Launois, M. (1974) Influence du facteur pluviométrique sur l'évolution saisonnière du criquet migrateur en phase solitaire et sur sa grégarisation à Madagascar. Thesis (Doctorat d'Etat), Université Paris (Orsay), Ministère de la Coopération, Paris, 159 pp.Google Scholar
Luong-Skovmand, M. H., Franc, M., Rabesisoa, L. F. and Lecoq, M. (2004) Le Criquet nomade à Madagascar: Eléments de bibliographie. Centre de coopération internationale en recherche agronomique pour le développement, Montpellier, France. 92 pp.Google Scholar
Michelmore, A. P. G. and Allan, W. (1934) Observations on phases of the red-winged locust in Northern Rhodesia. Bulletin of Entomological Research, 25, 101–128.CrossRefGoogle Scholar
Morant, V. (1947) Migrations and breeding of the red locust ( Nomadacris septemfasciata (Serville) in Africa, 1927–1945. Anti-Locust Memoirs, 2, 1–60.Google Scholar
Musuna, A. C. Z. (1988) Cereal crop losses from locusts in eastern, central and southern Africa region. Insect Science and its Application, 9, 701–707.Google Scholar
Randrianasolo, E. (1978) Biologie et écologie comparées de deux acridiens (Orthoptera: Cyrthacanthacridinae) Cyrtacanthacris tatarica tatarica (Linné, 1758) et Nomadacris septemfasciata (Serville, 1838) dans le Sud-Ouest de Madagascar. Thesis (Doctorat d'Université), Université Paris (Orsay), 189 pp.Google Scholar
Roblot, M. (1951) Le Criquet nomade (Nomadacris septemfasciata Serv.) au Soudan français. Agronomie Tropicale, 6(11–12). 565–605.Google Scholar
Scherer, R. (1997) Présentation de Locusta migratoria et de Nomadacris septemfasciata, pp. 83–107. In Symposium sur la lutte antiacridienne à Madagascar. Antananarivo 21–24. February 1995, DPV-GTZ, Toliara, Madagascar (Edited by Scherer, R. and Lié., F. H.). Projet DPV-GTZ Promotion de la protection intégrée des cultures et des denrées stockées.Google Scholar
Stortenbeker, C. W. (1967) Observations on the Population Dynamics of the Red Locust, Nomadacris septemfasciata ( Serville), in its Outbreak Areas. Agricultural Research Reports, Centre for Agricultural Publications and Documentation, Wageningen. 118 pp.Google Scholar
Têtefort, J. P. and Wintrebert, D. (1963) Eléments d'acridologie pratique à Madagascar. Agronomie Tropicale, 9, 875–932.Google Scholar
Têtefort, J. P. and Wintrebert, D. (1967) Ecologie et comportement du Criquet nomade dans le Sud-Ouest Malgache. Annales de la Société Entomologique de France, 3, 3–30.Google Scholar
Uvarov, B. P. (1966) Grasshoppers and Locusts: A Handbook of General Acridology, Cambridge University Press, Cambridge. 480 pp.Google Scholar
Zolotarevsky, B. N. (1939) Le criquet nomade ( Nomadacris septemfasciata Serv.) en Afrique française. Bulletin de la Société d'Histoire Naturelle d'Afrique du Nord, 30, 62–82.Google Scholar