scholarly journals Density-dependent growth of Alaska sockeye salmon in relation to climate–oceanic regimes, population abundance, and body size, 1925 to 1998

2008 ◽  
Vol 370 ◽  
pp. 1-18 ◽  
Author(s):  
EC Martinson ◽  
JH Helle ◽  
DL Scarnecchia ◽  
HH Stokes
Keyword(s):  
Body Size ◽  
Sockeye Salmon ◽  
Population Abundance ◽  
Density Dependent ◽  
Dependent Growth

Density-Dependent Growth in Early Ocean Life of Sockeye Salmon (Oncorhynchus nerka)

1984 ◽  
Vol 41 (12) ◽  
pp. 1825-1829 ◽  
Author(s):  
Randall M. Peterman
Keyword(s):  
British Columbia ◽  
Body Size ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Management Strategies ◽  
Gulf Of Alaska ◽  
Density Dependent ◽  
Adult Body Size ◽  
Adult Body ◽  
Dependent Growth

Significant decreases in adult body size and marine growth rate occur in seven British Columbia and Bristol Bay, Alaska, sockeye salmon (Oncorhynchus nerka) stocks when large numbers of sockeye are present in the Gulf of Alaska. These density-dependent effects arise mainly during early ocean life and are probably due to competition for food. The total sockeye abundance in the Gulf of Alaska is at least as important as within-stock abundance in determining final adult body size. British Columbia sockeye show a 10–22% decrease in adult body weight at high abundance of conspecifics. Thus, future evaluations of management strategies cannot simply focus on individual stocks, but must take a broader perspective which includes other sockeye populations.

Bioenergetics of Stock and Recruitment

1980 ◽  
Vol 37 (6) ◽  
pp. 1012-1024 ◽  
Author(s):  
D. M. Ware
Keyword(s):  
Life History ◽  
Body Size ◽  
Optimal Foraging ◽  
Reproductive Effort ◽  
Clupea Harengus ◽  
Recruitment Curve ◽  
Density Dependent ◽  
Surplus Energy ◽  
Dependent Growth ◽  
Stock And Recruitment

A new concept of recruitment is derived from bioenergetic considerations of life history phenomena. The proposed mechanism has two components, a stock-dependent process where individual reproductive effort is a decreasing function of the abundance of the mature stock, and a density-dependent mortality process which operates during the prerecruit stage. A generalized equation describing these processes yields a family of recruitment curves which vary from being asymptotic to dome-shaped, depending on the parameter values. The theory suggests that species like Atlantic herring (Clupea harengus harengus) which tend to have small density-dependent growth coefficients and which allocate most of their surplus energy to reproduction should have a small terminal body size, a high length at maturity to L∞ ratio, and a nearly asymptotic recruitment curve. By contrast, gadoids follow a different life history strategy and therefore should have a higher L∞ and more convex recruitment function. These consequences are shown to be in accord with observed differences in L∞ and with the graded series of recruitment curves found for a wide range of marine fish stocks. From a more general viewpoint, analysis of the energy dynamics of natural populations suggests that (1) there is a real — as opposed to inferred — limit to growth, L∞, which in many species is probably determined by their reproductive effort; (2) the increase in surplus energy with body size can be linked to the theory of optimal foraging; and (3) the intensity of density-dependent growth, which influences the shape of the recruitment curve, is an increasing function of the generation time of the prey organisms of different species. Thus gadoids tend to have dome-shaped reproduction curves because they feed on slow-maturing prey, which can be overcropped by large year-classes.Key words: stock and recruitment, bioenergetics, optimal foraging, growth, reproduction, life history strategies

scholarly journals Implications of density-dependent juvenile growth for compensatory recruitment regulation of haddock

1999 ◽  
Vol 56 (3) ◽  
pp. 356-363 ◽  
Author(s):  
C Tara Marshall ◽  
Kenneth T Frank
Keyword(s):  
Body Size ◽  
Temporal Trends ◽  
The United States ◽  
The Body ◽  
Bay Of Fundy ◽  
Compensatory Mechanism ◽  
Density Dependent ◽  
Positive Correlation ◽  
Dependent Growth ◽  
Adult Abundance

Data from bottom trawl surveys conducted by Canada and the United States were used to describe temporal trends in the length of haddock ages 1-4 on the southwestern Scotian Shelf (SWSS) and Bay of Fundy. From 1970 to 1995, the length of juvenile (age-1) haddock on the SWSS was negatively correlated with the abundance of adults (age-4+). Within year-classes temporal trends in juvenile length persisted through to the adult stage such that year-classes that were small(large) at age-1 were small(large) at age-4. These two results were combined with the positive correlation observed between recruitment and the body size characteristics of haddock on the SWSS in a conceptual model of compensatory recruitment regulation. In the model high adult abundance decreases growth of juveniles leading to smaller-sized adults and subsequently lower recruitment. Conversely, low adult abundance results in increased growth of juveniles leading to larger adults and higher recruitment. Density-dependent growth of juveniles, combined with the positive correlation between recruitment and adult body size, constitutes a compensatory mechanism for adjusting future haddock recruitment according to present adult abundance.

scholarly journals The spatial scale of density-dependent growth and implications for dispersal from nests in juvenile Atlantic salmon

Oecologia ◽  
2010 ◽  
Vol 165 (4) ◽  
pp. 959-969 ◽  
Author(s):  
Sigurd Einum ◽  
Grethe Robertsen ◽  
Keith H. Nislow ◽  
Simon McKelvey ◽  
John D. Armstrong
Keyword(s):  
Atlantic Salmon ◽  
Spatial Scale ◽  
Density Dependent ◽  
Juvenile Atlantic Salmon ◽  
Dependent Growth

Suppression of fibrinolysin T activity fails to restore density-dependent growth inhibition to SV3T3 cells

Nature ◽  
1974 ◽  
Vol 250 (5469) ◽  
pp. 739-741 ◽  
Author(s):  
IIH-NAN CHOU ◽  
PAUL H. BLACK ◽  
RICHARD O. ROBLIN
Keyword(s):  
Growth Inhibition ◽  
Density Dependent ◽  
Dependent Growth
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