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Journal article
Testing for biogeographic mechanisms promoting divergence in Caribbean crickets (genus Amphiacusta)
Journal of biogeography, v 37(3), pp 530-540
01 Mar 2010
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Aim This work examines whether the history of diversification of Amphiacusta (Orthoptera, Gryllidae) in the Caribbean corresponds to a vicariant or a dispersalist model.
Location The Greater Antillean islands of the Caribbean region.
Methods The phylogenetic relationships among species were estimated using a procedure that directly estimates the underlying species tree from independent loci (in this case, one mitochondrial and one nuclear locus). This tree was then used to test for topological congruence with a vicariant model, and to estimate divergence times.
Results The analyses based on the expected pattern of species divergence (i.e. species-tree topology) support a vicariant model. With the notable exception of a dispersal event marking the colonization of Jamaica, the timing of the events are generally consistent with a vicariant scenario, given the current taxon sampling and potential errors with dating the divergence events.
Main conclusions The tendency of species to co-segregate by island suggests that intra-island diversification is common. Despite their flightlessness, species of Amphiacusta are apparently capable of long-distance dispersal, such as colonization from the Puerto Rican/Virgin Island bank to Jamaica. The topology of the species tree is consistent with a vicariant model of divergence, and the dates of divergence between island groups are generally consistent with an island-island vicariance model. A strict island-island vicariance scenario can, however, be rejected because of inferred dispersal events such as the colonization of Jamaica. Nevertheless, the biogeographic tests suggest that most of the diversity was generated under a combination of intra-island diversification and island-island vicariance. Additional sampling of taxa will be needed to verify this hypothesized scenario. Our findings indicate that Amphiacusta presents an ideal opportunity for examining the role of sexual selection in promoting diversification, which would complement the large number of studies focused on adaptive divergence of Caribbean taxa.
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Details
- Title
- Testing for biogeographic mechanisms promoting divergence in Caribbean crickets (genus Amphiacusta)
- Creators
- Elen Oneal - Duke UniversityDaniel Otte - Drexel UniversityL. Lacey Knowles - University of Michigan
- Publication Details
- Journal of biogeography, v 37(3), pp 530-540
- Publisher
- Wiley
- Number of pages
- 11
- Grant note
- Society of Systematic Biology DEB-07-15487 / National Science Foundation; National Science Foundation (NSF) Rackham Graduate School (University of Michigan); University of Michigan System
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES); Academy of Natural Sciences of Drexel University
- Web of Science ID
- WOS:000273949700014
- Scopus ID
- 2-s2.0-75149123416
- Other Identifier
- 991019348912004721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Ecology
- Geography, Physical