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An Introduction to Parasitic Wasps of Drosophila and the Antiparasite Immune Response
Published on: May 7, 2012
Parasitoid fig-wasp evolutionary diversification and variation in ecological opportunity.
M J McLeish1, S van Noort, K A Tolley
1Department of Botany & Zoology, University of Stellenbosch, Natuurwetenskappe Building, Private Bag X1, Matieland, 7602, South Africa. mcleish@sun.ac.za
Molecular Ecology
|May 12, 2010
Summary
Parasitoid fig wasp speciation is not density-dependent. Instead, their diversity is a legacy of ancient ecological opportunities, like fig tree evolution and African climate changes.
Area of Science:
- Evolutionary biology
- Ecology
- Speciation research
Background:
- Ecological processes shape phenotype diversity.
- The role of parasitoid diversity in speciation and extinction rates is debated.
- It remains unknown if coevolutionary interactions influence density-dependent diversification.
Purpose of the Study:
- To test if parasitoid fig wasp diversification responds to ecological opportunity and density-independent processes.
- To investigate the drivers of parasitoid fig wasp diversity.
- To determine if coevolutionary radiations follow density-dependent diversification patterns.
Main Methods:
- Phylogenetic analysis to estimate divergence times.
- Gamma-statistics to infer diversification rate changes.
- Monte Carlo constant rates tests to assess diversification patterns.
Main Results:
- Diversification rates for parasitoid fig wasps were consistent with constant rates.
- Density-dependent cladogenesis could not fully explain parasitoid fig wasp diversification.
- Contemporary diversity is linked to past ecological opportunities, including fig tree evolution and African climate shifts.
Conclusions:
- Parasitoid fig wasp diversification is complex, not solely density-dependent.
- Ancient ecological opportunities, such as fig tree diversification and climate change, are key drivers.
- Phenotypic differentiation in specialist insects is coupled with infrequent ecological opportunity changes.
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