The Effects of Density Dependence and Immigration on Local Adaptation and Niche Evolution in a Black-Hole Sink Environment

1999 ◽  
Vol 55 (3) ◽  
pp. 283-296 ◽  
Author(s):  
Richard Gomulkiewicz ◽  
Robert D. Holt ◽  
Michael Barfield
Keyword(s):  
Black Hole ◽  
Density Dependence ◽  
Local Adaptation ◽  
Niche Evolution ◽  
Effects Of Density

Population dynamics of Japanese pink salmon (Oncorhynchus gorbuscha): are recent increases explained by hatchery programs or climatic variations?

2006 ◽  
Vol 63 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Kentaro Morita ◽  
Shoko H Morita ◽  
Masa-aki Fukuwaka
Keyword(s):  
Population Dynamics ◽  
Density Dependence ◽  
Climatic Factors ◽  
Pink Salmon ◽  
Climatic Variation ◽  
Oncorhynchus Gorbuscha ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Climatic Variations ◽  
Mass Release ◽  
Effects Of Density

Hatchery programs involving the mass release of artificially propagated fishes have been implemented worldwide. However, few studies have assessed whether hatchery programs actually increase the net population growth of the target species after accounting for the effects of density dependence and climatic variation. We examined the combined effects of density dependence, climatic variation, and hatchery release on the population dynamics of Japanese pink salmon (Oncorhynchus gorbuscha) from 1969 to 2003. The population trends were more closely linked to climatic factors than to the intensity of the hatchery programs. The estimated contributions of hatchery-released fry to catches during the past decade are small. We concluded that the recent catch increases of Japanese pink salmon could be largely explained by climate change, with increased hatchery releases having little effect.

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