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          Institute: MPI für Evolutionsbiologie     Collection: Tropical ecology     Display Documents



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ID: 332243.0, MPI für Evolutionsbiologie / Tropical ecology
What is responsible for the variance in life history traits of a South American semi-aquatic grasshopper (Cornops aquaticum)? A test of three possible hypotheses
Authors:Brede, Edward G.; Adis, Joachim; Schneider, Paula
Language:English
Date of Publication (YYYY-MM-DD):2007-12
Title of Journal:Studies on Neotropical Fauna and Environment
Volume:42
Issue / Number:3
Start Page:225
End Page:233
Review Status:not specified
Audience:Not Specified
Abstract / Description:The semi-aquatic grasshopper Cornops aquaticum (Bruner, 1906) is native to South America, with a distribution from the Argentinian pampas to the Gulf of Mexico, and is currently being proposed as a biological control agent for the invasive water hyacinth (Eichhornia crassipes) in South Africa. This study reports results of a neutral molecular marker (microsatellites) study on C. aquaticum within its native range. The data were analysed for levels of diversity and structure within/between South American populations, and correlations between host plant, geography and environmental/climatic variables were investigated. We found no evidence to support associations between host plant use and microsatellite genotypes (hypothesis 1). High levels of gene flow and weak genetic clustering of populations indicate a lack of differentiation, therefore an interaction between climate and local genotype (hypothesis 2) seems unlikely. Our results suggest that C. aquaticum may not have "tightly" coevolved with its host Eichhornia spp. (Pontederiaceae) as originally thought, and that instar variation might be due to the effect of local climate on phenotype (hypothesis 3) or possibly a locally adaptive trait.
Free Keywords:Acrididae; Cornops; genetic; microsatellite; phenotype; plasticity
External Publication Status:published
Document Type:Article
Communicated by:Brigitte Lechner
Affiliations:MPI für Limnologie/AG Tropenökologie
Identifiers:ISSN:0165-0521 (print) [ID-No:1]
ISSN:1744-5140 (online) [ID-No:2]
DOI:10.1080/01650520701414441 [ID-No:3]
LOCALID:2590/S 38751 [Listen-Nummer/S-Nummer]
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