Long-term survival of adult Arctic grayling (Thymallus arcticus) in the Kuparuk River, Alaska
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.
Whoriskey, Frederick G.; Naiman, Robert J. (Woods Hole Oceanographic Institution, 1982-01)Despite an absence of freshwater exploitation, the adult salmon run in the Matamek River, Quebec, declined during 1975-1980 to <23% of the level thought to occur there prior to 1967. Returns in 1979 and 1980 of adults tagged ...
Hearing abilities and sound reception of broadband sounds in an adult Risso’s dolphin (Grampus griseus ) Mooney, T. Aran; Yang, Wei-Cheng; Yu, Hsin-Yi; Ketten, Darlene R.; Jen, I-Fan (2015-04)While odontocetes do not have an external pinna that guides sound to the middle ear, they are considered to receive sound through specialized regions of the head and lower jaw. Yet odontocetes differ in the shape of the ...
Adult demography and larval processes in coastal benthic populations intertidal barnacles in Southern California and Baja California Tapia, Fabian J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2005-09)The geographic distribution and dynamics of coastal benthic populations are shaped by physical biological interactions affecting larval dispersal and the demography of juvenile and adult individuals. This thesis focused ...