POPULATION ECOLOGY- ORIGINAL PAPER The spatial scale of competition from recruits on an older cohort in Atlantic salmon

• Main Authors: Sigurd Einum, Keith H. Nislow, Simon Mckelvey, John D. Armstrong, S. Einum, K. H. Nislow, S. Mckelvey, J. D. Armstrong
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Atlantic salmon; Salmo salar
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.288.5117

Ó The Author(s) 2011. This article is published with open access at Springerlink.com Abstract Competitive effects of younger cohorts on older ones are frequently assumed to be negligible in species where older, larger individuals dominate in pairwise behavioural interactions. Here, we provide field estimates of such competition by recruits on an older age class in Atlantic salmon (Salmo salar), a species where observational studies have documented strong body size advantages which should favour older individuals in direct interactions. By creating realistic levels of spatial variation in the density of underyearling (YOY) recruits over a 1-km stretch of a stream, and obtaining accurate measurements Communicated by Marc Mangel.