caa a22 4500 445857404 CHVBK 20180317145432.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10592-010-0175-8 doi (NATIONALLICENCE)springer-10.1007/s10592-010-0175-8 Disruption of historical patterns of isolation by distance in coastal steelhead [Elektronische Daten] [Devon Pearse, Edith Martinez, John Garza] When natural populations exchange migrants at a rate proportional to their geographic distance, population genetics theory leads to the expectation of a pattern of isolation-by-distance (IBD), whereby geographic and genetic distance are correlated. However, the presence or absence of such patterns in modern populations may not fully reflect the historical relationships among those populations. Thus, historical samples, collected prior to modern human impacts, can often provide a critical baseline for comparison with modern populations. Steelhead, the anadromous form of rainbow trout, Oncorhynchus mykiss, are native to western North America and are endangered or threatened throughout most of California, near the southern extent of their native range. Population samples of steelhead collected in 1897 and 1909 in Central California rivers provided the opportunity to evaluate the historical genetic composition and population structure of these threatened fish. Here we show that these steelhead populations had a historically strong correlation between genetic and geographic distance that has been virtually erased in modern populations, suggesting that current relationships among modern steelhead populations are no longer reflective of natural migratory pathways. This demonstrates the critical role of migration in maintaining population relationships of threatened species and highlights the importance of natural history museums in providing historical baseline information. The Author(s), 2010 Oncorhynchus mykiss nationallicence Hatchery nationallicence Human impacts nationallicence Museum specimens nationallicence Pearse Devon NOAA Southwest Fisheries Science Center, National Marine Fisheries Service, 110 Shaffer Road, 95060, Santa Cruz, CA, USA aut Martinez Edith University of California, Santa Cruz, 95060, Santa Cruz, CA, USA aut Garza John NOAA Southwest Fisheries Science Center, National Marine Fisheries Service, 110 Shaffer Road, 95060, Santa Cruz, CA, USA aut Conservation Genetics Springer Netherlands 12/3(2011-06-01), 691-700 1566-0621 12:3<691 2011 12 10592 https://doi.org/10.1007/s10592-010-0175-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10592-010-0175-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pearse Devon NOAA Southwest Fisheries Science Center, National Marine Fisheries Service, 110 Shaffer Road, 95060, Santa Cruz, CA, USA aut NATIONALLICENCE 700 1- Martinez Edith University of California, Santa Cruz, 95060, Santa Cruz, CA, USA aut NATIONALLICENCE 700 1- Garza John NOAA Southwest Fisheries Science Center, National Marine Fisheries Service, 110 Shaffer Road, 95060, Santa Cruz, CA, USA aut NATIONALLICENCE 773 0- Conservation Genetics Springer Netherlands 12/3(2011-06-01), 691-700 1566-0621 12:3<691 2011 12 10592 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer