Abstract:
: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 (~2.713 mya) and time since demographic expansion (~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 ~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.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Alda F,Gagne RB,Walter RP,Hogan JD,Moody KN,Zink F,McIntyre PB,Gilliam JF,Blum MJdoi
10.1111/jeb.12929subject
Has Abstractpub_date
2016-10-01 00:00:00pages
2054-2069issue
10eissn
1010-061Xissn
1420-9101journal_volume
29pub_type
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