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Communication at the NABS Annual meeting, Keystone, 2000
(392) POPULATION DYNAMICS OF ARCTIC GRAYLING IN THE KUPARUK RIVER, ALASKA.
K.M. Buzby and L.A. Deegan. The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02540
The drift-feeding Arctic grayling (Thymallus arcticus, Salmonidae) is common in streams and rivers of Alaska and Canada and is the only fish species within the 5 km study reach of the Kuparuk River. We used a 15-year mark-recapture data set to estimate recapture and survival in the Kuparuk River using the program MARK. The most parsimonious model included annual estimates for both recapture and survival. Population estimates for the study reach ranged between 102 and 471 fish/km with a mean (± S.E.) of 223 ± 11 fish/km. Annual recapture estimates ranged from 0.094 to 0.433 with a mean (± S.E.) of 0.267± 0.024. Annual survival estimates ranged from 0.284 to 0.987 with a mean (± S.E.) of 0.590 ± 0.053. Survival was lower following years with warm summers and low discharge than following cold summers with high discharge. These results indicate that, with expected stream temperature increases due to global warming, annual survival of arctic grayling would decline perhaps leading to extirpation in the southern portion of it's range.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Fish Ecology
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