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          Institute: MPI für Evolutionsbiologie     Collection: Tropical ecology     Display Documents



  history
ID: 438831.0, MPI für Evolutionsbiologie / Tropical ecology
Morphometric differences in the grasshopper Cornops aquaticum (Bruner, 1906) from South America and South Africa
Authors:Adis, Joachim; Sperber, Carlos F.; Brede, Edward G.; Capello, Soledad; Franceschini, Maria Celeste; Hill, Martin; Lhano, Marcos G.; Marques, Marinêz M.; Nunes, Ana L.; Polar, Perry
Language:English
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Journal of Orthoptera Research
Volume:17
Issue / Number:2
Start Page:141
End Page:147
Review Status:not specified
Audience:Not Specified
Abstract / Description:The semi-aquatic grasshopper Cornops aquaticum is native to South America and inhabits lowlands from Southern,Mexico to Central Argentina and Uruguay. It is host-specific to aquatic plants in the genera Eichhornia and Pontederia. A quarantine population has existed in South Africa for 10 y, and it is planned to release it there as a biological control agent of water hyacinth, E. crassipes. Various studies of C. aquaticum are coordinated under HICWA (www.mpil-ploen.mpg.de). This paper compares the morphometry of the release population and 11 native Populations in South America. We tested four hypotheses: 1) South African and South American Populations Of C. aquaticum differ in morphology; 2) the South African laboratory population is more similar to other isolated populations in South America than to nonisolated populations; 3) morphology differs across sites; 4) morphology differs with host plant. South African Populations differed from continental nonisolated Populations, but not from continental isolated ones. Isolated populations presented smaller individuals than nonisolated, but there was also a change in male morphology: while in nonisolated populations male wing length was similar to their body length, ill isolated populations, male wings were smaller than body length. Females were larger when on Eicchornia azurea than on E. crassipes, while males presented larger wings than their body oil E. azurea, and similar lengths on E. crassipes. These morphological changes may have resulted from phenotypic plasticity, selection for small size, or because of a loss of genetic diversity in quantitative traits.
Free Keywords:geography; isolation; morphology; morphometrics; bodysize; wing; Eichhornia; Pontederia; water hyacinth; Neotropics
External Publication Status:published
Document Type:Article
Communicated by:Brigitte Lechner
Affiliations:MPI für Evolutionsbiologie/AG Tropenökologie
External Affiliations:Laboratório de Orthopterologia, Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570-000 Viçosa-MG, Brazil; Instituto Nacional de Limnología (INALI-CONICET-UNL), José Maciá 1933, 3016 Santo Tomé, Santa Fé, Argentina; Centro de Ecologia Aplicada del Litoral (CECOAL-CONICET), Ruta Prov. 5, km 2,5 - cc 291, 3400 Corrientes, Argentina; Department of Zoology and Entomology, Rhodes University, P.O. Box 94, Grahamstown, 6140, South Africa;
PRODOC, Laboratório de Orthopterologia, Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570-000 Viçosa-MG, Brazil; Instituto de Biociências (Departamento de Biologia e Zoologia), Universidade Federal de Mato Grosso, Avenida Fernando Corrêa da Costa s/n, 78060-900 Cuiabá-MT, Brazil; Muséu Paraense Emílio Goeldi, Caixa Postal 399, 66040-970 Belém-PA, Brazil; CAB International, Gordon Street, Curepe, Trinidad
Identifiers:ISSN:1082-6467 (print) [ID-No:1]
ISSN:1082-6467 (online) [ID-No:2]
ISSN:1937-2426 (online) [ID-No:3]
LOCALID:2722/S 39042 [Listen-Nummer/S-Nummer]
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