caa a22 4500 445857293 CHVBK 20180317145432.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10592-011-0240-y doi (NATIONALLICENCE)springer-10.1007/s10592-011-0240-y Population genetics and conservation implications for the endangered delta smelt in the San Francisco Bay-Delta [Elektronische Daten] [Kathleen Fisch, Jordana Henderson, Ronald Burton, Bernie May] Over the last two decades, the collapse of the endangered delta smelt (Hypomesus transpacificus) in the San Francisco Bay-Delta has resulted in politically charged conservation decisions, including the rationing of valuable Delta water for use in California agriculture and urban centers. A fundamental question remaining in delta smelt conservation is whether current management strategies have been appropriately designed to protect the remaining genetic variation in delta smelt populations, rather than merely mitigating the decline of the species. We used 15 microsatellite markers to characterize genetic variation within and among sampling regions on geographic and temporal scales, to estimate changes in effective population size over time, to determine if a genetic bottleneck exists and to define conservation management units for this species. A genetic bottleneck was detected in each of the four sampling years, and a significant decline in effective population size was observed between sampling years 2003 and 2007. We also detected a weak geographic signal in any given sampling year that was unsupported by temporal consistency of this signal. We assessed two strategies for defining conservation units, and concluded that continuing to manage the species as a single, panmictic population throughout its range is the most feasible management strategy. The results of this study will inform conservation decisions and provide an effective means for genetically monitoring this imperiled species. Springer Science+Business Media B.V., 2011 Hypomesus transpacificus nationallicence Conservation genetics nationallicence Effective population size nationallicence Bottleneck nationallicence Microsatellites nationallicence Management units nationallicence Fisch Kathleen Genomic Variation Laboratory, Department of Animal Science, University of California, Davis, One Shields Avenue, 95616, Davis, CA, USA aut Henderson Jordana Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, 8750 Biological Grade, 2330 Hubbs Hall, 92037, La Jolla, CA, USA aut Burton Ronald Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, 8750 Biological Grade, 2330 Hubbs Hall, 92037, La Jolla, CA, USA aut May Bernie Genomic Variation Laboratory, Department of Animal Science, University of California, Davis, One Shields Avenue, 95616, Davis, CA, USA aut Conservation Genetics Springer Netherlands 12/6(2011-12-01), 1421-1434 1566-0621 12:6<1421 2011 12 10592 https://doi.org/10.1007/s10592-011-0240-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10592-011-0240-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fisch Kathleen Genomic Variation Laboratory, Department of Animal Science, University of California, Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Henderson Jordana Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, 8750 Biological Grade, 2330 Hubbs Hall, 92037, La Jolla, CA, USA aut NATIONALLICENCE 700 1- Burton Ronald Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, 8750 Biological Grade, 2330 Hubbs Hall, 92037, La Jolla, CA, USA aut NATIONALLICENCE 700 1- May Bernie Genomic Variation Laboratory, Department of Animal Science, University of California, Davis, One Shields Avenue, 95616, Davis, CA, USA aut NATIONALLICENCE 773 0- Conservation Genetics Springer Netherlands 12/6(2011-12-01), 1421-1434 1566-0621 12:6<1421 2011 12 10592 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer