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Parallel habitat specialization within the wolf spider genus Hogna from the Galapagos

Charlotte De Busschere UGent, Frederik Hendrickx UGent, Steven Van Belleghem UGent, T Backeljau, Luc Lens UGent and L Baert (2010) MOLECULAR ECOLOGY. 19(18). p.4029-4045
abstract
Within most island archipelagos, such as the Galapagos, similar ecological gradients are found on geographically isolated islands. Species radiations in response to these ecological gradients may follow different scenarios being (i) a single habitat specialization event followed by secondary colonization of each ecotype on the different islands or (ii) repeated and parallel habitat specialization on each island separately. This latter scenario has been considered less likely as gene flow might hamper such ecotypic differentiation. At least for the Galapagos, the extent to which this process is involved in species radiations remains yet poorly understood. Within the wolf spider genus Hogna, seven species are described that can be divided into three different ecotypes based on general morphology and habitat preference i.e. species that inhabit the pampa vegetation in the highlands, species that occur in coastal dry habitats and one generalist species. Comparison of the species phylogeny based on one mitochondrial (COI) and one nuclear (28S) gene fragment convincingly demonstrates that 'pampa' and 'coastal dry' species evolved in parallel on the islands Santa Cruz and San Cristobal. Despite the observation that allozymes analysis indicated that each species forms a distinct genetic cluster, phylogenetic divergence within these species complexes was very low and paraphyletic and most likely due to hybridization rather than incomplete lineage sorting, as demonstrated for the Santa Cruz species complex. This suggests that within-island speciation occurred under low levels of gene flow. Species phylogeny in general did not follow the progression of island emergence as a molecular clock analysis suggested that island endemic species may have diverged after as well as before the emergence of the islands. This represents the first clear example of parallel and within-island speciation because of habitat specialization on the Galapagos and that such divergence most likely occurred under historic gene flow.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
ECOLOGICAL SPECIATION, DARWINS FINCHES, SYMPATRIC SPECIATION, ADAPTIVE RADIATION, POPULATION-STRUCTURE, BAYESIAN-INFERENCE, GIANT TORTOISES, MIXED MODELS, DIVERGENCE, DIVERSIFICATION, adaptive radiation, hybridization, introgression, Lycosidae, parapatric speciation, phylogeography
journal title
MOLECULAR ECOLOGY
Mol. Ecol.
volume
19
issue
18
pages
4029 - 4045
Web of Science type
Article
Web of Science id
000281797400018
JCR category
ECOLOGY
JCR impact factor
6.457 (2010)
JCR rank
5/129 (2010)
JCR quartile
1 (2010)
ISSN
0962-1083
DOI
10.1111/j.1365-294X.2010.04758.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1251164
handle
http://hdl.handle.net/1854/LU-1251164
date created
2011-06-01 13:34:24
date last changed
2011-06-14 09:31:58
@article{1251164,
  abstract     = {Within most island archipelagos, such as the Galapagos, similar ecological gradients are found on geographically isolated islands. Species radiations in response to these ecological gradients may follow different scenarios being (i) a single habitat specialization event followed by secondary colonization of each ecotype on the different islands or (ii) repeated and parallel habitat specialization on each island separately. This latter scenario has been considered less likely as gene flow might hamper such ecotypic differentiation. At least for the Galapagos, the extent to which this process is involved in species radiations remains yet poorly understood. Within the wolf spider genus Hogna, seven species are described that can be divided into three different ecotypes based on general morphology and habitat preference i.e. species that inhabit the pampa vegetation in the highlands, species that occur in coastal dry habitats and one generalist species. Comparison of the species phylogeny based on one mitochondrial (COI) and one nuclear (28S) gene fragment convincingly demonstrates that 'pampa' and 'coastal dry' species evolved in parallel on the islands Santa Cruz and San Cristobal. Despite the observation that allozymes analysis indicated that each species forms a distinct genetic cluster, phylogenetic divergence within these species complexes was very low and paraphyletic and most likely due to hybridization rather than incomplete lineage sorting, as demonstrated for the Santa Cruz species complex. This suggests that within-island speciation occurred under low levels of gene flow. Species phylogeny in general did not follow the progression of island emergence as a molecular clock analysis suggested that island endemic species may have diverged after as well as before the emergence of the islands. This represents the first clear example of parallel and within-island speciation because of habitat specialization on the Galapagos and that such divergence most likely occurred under historic gene flow.},
  author       = {De Busschere, Charlotte and Hendrickx, Frederik and Van Belleghem, Steven and Backeljau, T and Lens, Luc and Baert, L},
  issn         = {0962-1083},
  journal      = {MOLECULAR ECOLOGY},
  keyword      = {ECOLOGICAL SPECIATION,DARWINS FINCHES,SYMPATRIC SPECIATION,ADAPTIVE RADIATION,POPULATION-STRUCTURE,BAYESIAN-INFERENCE,GIANT TORTOISES,MIXED MODELS,DIVERGENCE,DIVERSIFICATION,adaptive radiation,hybridization,introgression,Lycosidae,parapatric speciation,phylogeography},
  language     = {eng},
  number       = {18},
  pages        = {4029--4045},
  title        = {Parallel habitat specialization within the wolf spider genus Hogna from the Galapagos},
  url          = {http://dx.doi.org/10.1111/j.1365-294X.2010.04758.x},
  volume       = {19},
  year         = {2010},
}

Chicago
De Busschere, Charlotte, Frederik Hendrickx, Steven Van Belleghem, T Backeljau, Luc Lens, and L Baert. 2010. “Parallel Habitat Specialization Within the Wolf Spider Genus Hogna from the Galapagos.” Molecular Ecology 19 (18): 4029–4045.
APA
De Busschere, C., Hendrickx, F., Van Belleghem, S., Backeljau, T., Lens, L., & Baert, L. (2010). Parallel habitat specialization within the wolf spider genus Hogna from the Galapagos. MOLECULAR ECOLOGY, 19(18), 4029–4045.
Vancouver
1.
De Busschere C, Hendrickx F, Van Belleghem S, Backeljau T, Lens L, Baert L. Parallel habitat specialization within the wolf spider genus Hogna from the Galapagos. MOLECULAR ECOLOGY. 2010;19(18):4029–45.
MLA
De Busschere, Charlotte, Frederik Hendrickx, Steven Van Belleghem, et al. “Parallel Habitat Specialization Within the Wolf Spider Genus Hogna from the Galapagos.” MOLECULAR ECOLOGY 19.18 (2010): 4029–4045. Print.