Predictability of multispecies competitive interactions in three populations of Atlantic salmon Salmo salar

• Published in: Journal of Fish Biology
• Main Authors: Houde, A. L. S., Wilson, C. C., Neff, B. D.
• Other Authors: Natural Sciences and Engineering Research Council of Canada, Strategic Project Grant, Ontario Government, Ontario Ministry of Natural Resources and Forestry, Ontario Federation of Anglers and Hunters, Metro East Anglers
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2015
• Subjects: Aquatic Science; Ecology, Evolution, Behavior and Systematics; Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1111/jfb.12644; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.12644; https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.12644

Juvenile Atlantic salmon Salmo salar from three allopatric populations ( LaHave , Sebago and Saint‐Jean) were placed into artificial streams with combinations of four non‐native salmonids: brown trout Salmo trutta , rainbow trout Oncorhynchus mykiss , Chinook salmon Oncorhynchus tshawytscha and coho salmon Oncorhynchus kisutch . Non‐additive effects, as evidenced by lower performance than predicted from weighted summed two‐species competition trials, were detected for S. salar fork length ( L F ) and mass, but not for survival, condition factor or riffle use. These data support emerging theory on niche overlap and species richness as factors that can lead to non‐additive competition effects.