Journal
JOURNAL OF EVOLUTIONARY BIOLOGY
Volume 29, Issue 10, Pages 2054-2069Publisher
WILEY
DOI: 10.1111/jeb.12929
Keywords
amphidromy; evolutionary history; goby; Hawai'i; island biogeography; snail
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Funding
- US Department of Defense [RC-1646]
- Tulane-Xavier Center for Bioenvironmental Research
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It is widely accepted that insular terrestrial biodiversity progresses with island age because colonization and diversification proceed over time. Here, we assessed whether this principle extends to oceanic island streams. We examined rangewide mtDNA sequence variation in four stream-dwelling species across the Hawaiian archipelago to characterize the relationship between colonization and demographic expansion, and to determine whether either factor reflects island age. We found that colonization and demographic expansion are not related and that neither corresponds to island age. The snail Neritina granosa exhibited the oldest colonization time (similar to 2.713 mya) and time since demographic expansion (similar to 282 kya), likely reflecting a preference for lotic habitats most prevalent on young islands. Conversely, gobioid fishes (Awaous stamineus, Eleotris sandwicensis and Sicyopterus stimpsoni) colonized the archipelago only similar to 0.411-0.935 mya, suggesting ecological opportunities for colonization in this group were temporally constrained. These findings indicate that stream communities form across colonization windows, underscoring the importance of ecological opportunities in shaping island freshwater diversity.
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