Death rates and time intervals: Is there an alternative to the constant natural mortality axiom?.
For a limited sample of highly fecund marine organisms a simple, twoparameter reciprocal function of age is a reasonable, and mathematically parsimonious, description of the form of the life history Mvector between egg and larval stages and the mean parental age (MPA). Mortality rates may increase... Full description
Journal Title:  Reviews in Fish Biology and Fisheries Vol.1(2), pp.109138 
Main Author:  Caddy, J 
Format:  Electronic Article 
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English 
Subjects:  
Created:  0, 1991 
ID:  ISSN: 09603166 
Link:  http://search.proquest.com/docview/16113508/?pqorigsite=primo 
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title:  Death rates and time intervals: Is there an alternative to the constant natural mortality axiom?. 
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ispartof:  Reviews in Fish Biology and Fisheries, Vol.1(2), pp.109138 
description:  For a limited sample of highly fecund marine organisms a simple, twoparameter reciprocal function of age is a reasonable, and mathematically parsimonious, description of the form of the life history Mvector between egg and larval stages and the mean parental age (MPA). Mortality rates may increase later in life, especially for semelparous species, and in this case would need to be described by an additional or more complex function, beyond the scope of this paper. Calculations assuming population stability, and using indicative values for mean lifetime fecundity (MLF) and mean parental age (MPA), are presented for a generalized demersal and a generalized small pelagic fish, employing the reciprocal function with proportional time allocation. The new model has the advantage of being compatible with the "constant adult M" hypothesis over periods of roughly 45 and 1+ years, respectively, for generalized northern demersals and small pelagics, over the ages just preceding MPA. The possibility of extension of this model to lengthbased methods, and its analogies with crustacean moulting models, are discussed. 
language:  eng 
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identifier:  ISSN: 09603166 
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