Patterns of density-dependent growth in juvenile stream-dwelling salmonids

Literature data for 19 populations from 16 different studies of six species of stream‐dwelling salmonids were analysed to test the hypothesis that density‐dependent growth is stronger at low rather than at high population density. Fifteen of 19 populations showed evidence of a significant decrease i...

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Bibliographic Details
Published in:Journal of fish biology 2005-12, Vol.67 (sB), p.100-110
Main Authors: Grant, J. W. A., Imre, I.
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
compensatory responses
exploitative competition
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
growth rate
population density
population regulation
Salmonidae
Synecology
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
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Summary:Literature data for 19 populations from 16 different studies of six species of stream‐dwelling salmonids were analysed to test the hypothesis that density‐dependent growth is stronger at low rather than at high population density. Fifteen of 19 populations showed evidence of a significant decrease in growth rate with increasing density. In 11 of these 15 populations, the pattern of density‐dependent growth was better described by a negative power curve than by a linear regression (i.e. Akaike Information Criterion, AIClinear − AICpower > 2), whereas only one population was better described by a linear regression than by a negative power curve; three populations were adequately described by both models (AIC 
ISSN:0022-1112
1095-8649
DOI:10.1111/j.0022-1112.2005.00916.x