Long-term survival of adult Arctic grayling (Thymallus arcticus) in the Kuparuk River, Alaska
Buzby, Karen M.
Deegan, Linda A.
MetadataShow full item record
In many long-lived species such as Arctic grayling (Thymallus arcticus), population growth rate is most sensitive to changes in adult survival probabilities. Understanding the factors that regulate adult survival in this species should provide insight into the population dynamics of this and other long-lived Arctic species. Using the program MARK, we analyzed 17 years of mark–recapture data to estimate survival rates for Arctic grayling in the Kuparuk River, Alaska, from 1985 to 2000. Mean annual survival rates overall ranged from 0.39 to 1.0 and averaged 0.71 ± 0.05 for resident and 0.75 ± 0.05 for nonresident fish. Spending the summer in the more productive fertilized zone of the experimental reach had no influence on survival despite higher productivity on all trophic levels and consistently higher growth rates in Arctic grayling. None of the environmental (stream temperature, discharge, winter severity, and incidence of drought) or population parameters (growth, condition factor, and mean fish size) that we examined explained significant amounts of variance in survival rates. The lack of responsiveness of survival to annual environmental conditions was unexpected and suggests that multiyear factors or life history tactics that maintain survival at the expense of growth and fecundity likely determine survival.
Author Posting. © National Research Council Canada, 2004. This article is posted here by permission of National Research Council Canada for personal use, not for redistribution. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences 61 (2004): 1954-1964, doi:10.1139/F04-126.
Showing items related by title, author, creator and subject.
Recruitment of the intertidal barnacle Semibalanus balanoides ; metamorphosis and survival from daily to seasonal timescales Blythe, Jonathan N. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-09)The benthic habitat is the terminal destination for marine animals in terms of their reproductive lifecycle. Recruitment dynamics relating to seasonal changes in the benthic habitat may be the best source of information ...
Impact of intentionally injected carbon dioxide hydrate on deep-sea benthic foraminiferal survival Bernhard, Joan M.; Barry, James P.; Buck, Kurt R.; Starczak, Victoria R. (2008-10)Sequestration of carbon dioxide (CO2) in the ocean is being considered as a feasible mechanism to mitigate the alarming rate in its atmospheric rise. Little is known, however, about how the resulting hypercapnia and ocean ...