caa a22 4500 606227016 CHVBK 20210128101156.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10641-015-0389-1 doi (NATIONALLICENCE)springer-10.1007/s10641-015-0389-1 Use of otolith microchemistry and stable isotopes to investigate the ecology and anadromous migrations of Northern Dolly Varden from the Egegik River, Bristol Bay, Alaska [Elektronische Daten] [Lindsay Hart, Morgan Bond, Shannan May-McNally, Jessica Miller, Thomas Quinn] Dolly Varden (Salvelinus malma) is a facultatively anadromous and iteroparous salmonid species, widely distributed around the Pacific Rim. Its distribution overlaps in northern areas with the circumpolar congeneric Arctic char (S. alpinus), which shares some of its life history traits. Despite the abundance of both species in many Alaskan watersheds and the diversity of their life histories, relatively little is known about their estuarine and marine ecology and migrations. Thirty char, taken as by-catch in the sockeye salmon (Oncorhynchus nerka) gill net fishery in the Egegik District, Bristol Bay, Alaska in June and July 2013, were identified using molecular genetic techniques as Dolly Varden. Otoliths indicated that the fish, ranging from 445 to 560mm fork length, were from 4 to 9years old, with a modal age of 6 (40% of the specimens). Microchemical analysis indicated that all fish had first migrated to sea at ages 2 or 3 (16 and 14 individuals, respectively), migrated annually thereafter to a maximum of eight times, and did not over-winter in marine waters. Moreover, the fish were produced by a mix of anadromous mothers (14 fish) and non-anadromous mothers (11 fish); the maternal origin of the other five fish was uncertain. Despite the fact that the fish were captured in the riverine/estuarine environment of the Egegik River, stable isotope analysis of muscle tissue samples indicated that they had relied on marine prey, and this was supported by the high Sr levels in the otoliths, indicating prior occupancy of marine rather than fresh water for all individuals tested. Together, these analyses reveal extensive use of marine resources by Dolly Varden across a wide range of sizes and ages during regular but brief migrations, and provide new information on this facultatively anadromous, long-lived salmonid. Springer Science+Business Media Dordrecht, 2015 Anadromy nationallicence Life history nationallicence Char nationallicence Salmonid nationallicence Migration nationallicence Hart Lindsay School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut Bond Morgan School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut May-McNally Shannan Department of Zoology, Biodiversity Research Centre and Beaty Biodiversity Museum, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada aut Miller Jessica Department of Fisheries and Wildlife, Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Drive, 97365, Newport, OR, USA aut Quinn Thomas School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut Environmental Biology of Fishes Springer Netherlands 98/6(2015-06-01), 1633-1643 0378-1909 98:6<1633 2015 98 10641 https://doi.org/10.1007/s10641-015-0389-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-015-0389-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hart Lindsay School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut NATIONALLICENCE 700 1- Bond Morgan School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut NATIONALLICENCE 700 1- May-McNally Shannan Department of Zoology, Biodiversity Research Centre and Beaty Biodiversity Museum, University of British Columbia, V6T 1Z4, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Miller Jessica Department of Fisheries and Wildlife, Coastal Oregon Marine Experiment Station, Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Drive, 97365, Newport, OR, USA aut NATIONALLICENCE 700 1- Quinn Thomas School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/6(2015-06-01), 1633-1643 0378-1909 98:6<1633 2015 98 10641