Journal article
Density dependence and density independence during the early life stages of four marine fish stocks
Ecology (Durham), Vol.88(3), pp.625-634
2007
DOI: 10.1890/05-1782
PMID: 17503591
Abstract
Recruitment variability caused by density-dependent and density-independent processes is an important area within the study of fish dynamics. These processes can exhibit nonlinearities and nonadditive properties that may have profound dynamic effects. We investigate the importance of population density (i.e., density dependence) and environmental forcing (i.e., density independence) on the age-0 and age-1 abundance of capelin (Mallotus villosus), northeast Arctic cod (Gadus morhua), northeast Arctic haddock (Melanogrammus aeglefinus), and Norwegian spring spawning herring (Clupea harengus) in the Barents Sea. We use statistical methods that explicitly account for nonlinearities and nonadditive interactions between internal and external variables in the abundance of these two pre-recruitment stages. Our results indicate that, during their first five months of life, cod, haddock, and herring experience higher density-dependent survival than capelin. The abundance of age-0 cod depends on the mean age and biomass of the spawning stock, a result which has implications for the management of the entire cod stock. Temperature is another important factor influencing the abundance at age-0 and age-1 of all four species, except herring at age-1. Between age-0 and age-1, there is an attenuation of density-dependent survival for cod and herring, while haddock and capelin experience density dependence at high and low temperatures, respectively. Predation by subadult cod is important for both capelin and cod at age-1. We found strong indications for interactions among the studied species, pointing to the importance of viewing the problem of species recruitment variability as a community, rather than as a population phenomenon. © 2007 by the Ecological Society of America.
Details
- Title: Subtitle
- Density dependence and density independence during the early life stages of four marine fish stocks
- Creators
- Gjert E Dingsør - University of BergenLorenzo Ciannelli - University of OsloKung-Sik Chan - University of IowaGeir Ottersen - Institute of Marine ResearchNils Chr Stenseth - University of Oslo
- Resource Type
- Journal article
- Publication Details
- Ecology (Durham), Vol.88(3), pp.625-634
- Publisher
- Ecological Society of America
- DOI
- 10.1890/05-1782
- PMID
- 17503591
- ISSN
- 0012-9658
- eISSN
- 1939-9170
- Language
- English
- Date published
- 2007
- Academic Unit
- Statistics and Actuarial Science; Radiology
- Record Identifier
- 9984257609702771
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