caa a22 4500 445891750 CHVBK 20180317145618.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10750-010-0588-x doi (NATIONALLICENCE)springer-10.1007/s10750-010-0588-x Rocks and clocks: linking geologic history and rates of genetic differentiation in anchialine organisms [Elektronische Daten] [Scott Santos, David Weese] The geologic history of a region can significantly impact the development of its flora and fauna, with past events shaping community patterns and evolutionary trajectories of species. In this context, islands are excellent "natural laboratories” for studying the fundamental processes of evolution due to their discrete geographical nature and dynamic geologic histories. An island system meeting these criteria is the Hawaiian Archipelago, which is ideal for testing how island geologic history influences the processes leading to population genetic variation and differentiation. One Hawaiian endemic whose evolutionary history is closely tied to the geology of the islands is the anchialine atyid shrimp Halocaridina, whose mitochondrial cytochrome oxidase I (COI) gene is hypothesized to be evolving at the rate of 20% per million years. To validate this rapid evolutionary rate, time since divergence estimates between geographically close, yet genetically distinct, populations were calculated for Halocaridina from anchialine habitats on the islands of Hawai'i, Maui, and O'ahu. On the younger (i.e., <1.5 million years) islands of Hawai'i and Maui, where all anchialine habitats occur in basalt, application of the Halocaridina molecular clock identified a strong correlation between levels of genetic divergence and the geologic age of the region inhabited by those populations. In contrast, this relationship weakened when similar analyses were conducted for Halocaridina from limestone anchialine habitats on the older (i.e., >2.75 million years) island of O'ahu. These results suggest geologic age, basin origin and/or composition are important factors that should be taken into consideration when conducting molecular clock analyses on anchialine flora and fauna as well as island populations in general. Springer Science+Business Media B.V., 2011 Anchialine nationallicence Coalescent analysis nationallicence Crustacean nationallicence Hawai'i nationallicence Halocaridina nationallicence Invertebrate nationallicence Molecular clocks nationallicence Phylogeography nationallicence Santos Scott Department of Biological Sciences, Cell & Molecular Biosciences Peak Program and Molette Biology Laboratory for Environmental and Climate Change Studies, Auburn University, 101 Life Sciences Building, 36849-5407, Auburn, AL, USA aut Weese David Department of Biological Sciences, Cell & Molecular Biosciences Peak Program and Molette Biology Laboratory for Environmental and Climate Change Studies, Auburn University, 101 Life Sciences Building, 36849-5407, Auburn, AL, USA aut Hydrobiologia Springer Netherlands 677/1(2011-11-01), 53-64 0018-8158 677:1<53 2011 677 10750 https://doi.org/10.1007/s10750-010-0588-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0588-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Santos Scott Department of Biological Sciences, Cell & Molecular Biosciences Peak Program and Molette Biology Laboratory for Environmental and Climate Change Studies, Auburn University, 101 Life Sciences Building, 36849-5407, Auburn, AL, USA aut NATIONALLICENCE 700 1- Weese David Department of Biological Sciences, Cell & Molecular Biosciences Peak Program and Molette Biology Laboratory for Environmental and Climate Change Studies, Auburn University, 101 Life Sciences Building, 36849-5407, Auburn, AL, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 677/1(2011-11-01), 53-64 0018-8158 677:1<53 2011 677 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer