Journal
JOURNAL OF HEREDITY
Volume 111, Issue 1, Pages 92-102Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/esz068
Keywords
Bulimulidae; in situ speciation; island biogeography; island progression rule; Naesiotus; overseas dispersal
Categories
Funding
- National Geographic Society
- National Science Foundation [1523540, 1751157]
- American Malacological Society
- Western Society of Malacology
- Conchologists of America
- Systematics Research Fund
- Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health [P30 GM103324]
- University of Idaho graduate fellowship in Bioinformatics and Computational Biology
- National Science Foundation Graduate Research Fellowship [DGE-1656518]
- Direct For Biological Sciences
- Division Of Environmental Biology [1751157] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Div Of Biological Infrastructure [1523540] Funding Source: National Science Foundation
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Newly arrived species on young or remote islands are likely to encounter less predation and competition than source populations on continental landmasses. The associated ecological release might facilitate divergence and speciation as colonizing lineages fill previously unoccupied niche space. Characterizing the sequence and timing of colonization on islands represents the first step in determining the relative contributions of geographical isolation and ecological factors in lineage diversification. Herein, we use genome-scale data to estimate timing of colonization in Naesiotus snails to the Galapagos islands from mainland South America. We test inter-island patterns of colonization and within-island radiations to understand their contribution to community assembly. Partly contradicting previously published topologies, phylogenetic reconstructions suggest that most Naesiotus species form island-specific clades, with within-island speciation dominating cladogenesis. Galapagos Naesiotus also adhere to the island progression rule, with colonization proceeding from old to young islands and within-island diversification occurring earlier on older islands. Our work provides a framework for evaluating the contribution of colonization and in situ speciation to the diversity of other Galapagos lineages.
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