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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, two-parameter reciprocal function of age is a reasonable, and mathematically parsimonious, description of the form of the life history M-vector 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.109-138
Main Author: Caddy, J
Format: Electronic Article Electronic Article
Language: English
Subjects:
Created: 0, 1991
ID: ISSN: 0960-3166
Link: http://search.proquest.com/docview/16113508/?pq-origsite=primo
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recordid: proquest16113508
title: Death rates and time intervals: Is there an alternative to the constant natural mortality axiom?.
format: Article
creator:
  • Caddy, J
subjects:
  • Mortality
  • Natural Mortality
  • Mathematical Models
  • Marine Crustaceans
  • Marine Fish
  • Population Dynamics
  • Mortality
  • Mathematical Models
  • Population Dynamics
  • Marine
  • Population Dynamics
  • Fisheries and Fishery Biology
  • Fish
  • Stock Assessment and Management
  • Pisces
  • Marine Crustaceans
  • Marine Fish
  • Natural Mortality
  • Reviews
  • Stock Assessment
ispartof: Reviews in Fish Biology and Fisheries, Vol.1(2), pp.109-138
description: For a limited sample of highly fecund marine organisms a simple, two-parameter reciprocal function of age is a reasonable, and mathematically parsimonious, description of the form of the life history M-vector 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 4-5 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 length-based methods, and its analogies with crustacean moulting models, are discussed.
language: eng
source:
identifier: ISSN: 0960-3166
fulltext: fulltext
issn:
  • 09603166
  • 0960-3166
url: Link


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titleDeath rates and time intervals: Is there an alternative to the constant natural mortality axiom?.
creatorCaddy, J
contributorCaddy, J (correspondence author)
creationdate0, 1991
ispartofReviews in Fish Biology and Fisheries, Vol.1(2), pp.109-138
identifierISSN: 0960-3166
subjectMortality ; Natural Mortality ; Mathematical Models ; Marine Crustaceans ; Marine Fish ; Population Dynamics ; Mortality ; Mathematical Models ; Population Dynamics ; Marine ; Population Dynamics ; Fisheries and Fishery Biology ; Fish ; Stock Assessment and Management ; Pisces ; Marine Crustaceans ; Marine Fish ; Natural Mortality ; Reviews ; Stock Assessment
descriptionFor a limited sample of highly fecund marine organisms a simple, two-parameter reciprocal function of age is a reasonable, and mathematically parsimonious, description of the form of the life history M-vector 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 4-5 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 length-based methods, and its analogies with crustacean moulting models, are discussed.
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titleDeath rates and time intervals: Is there an alternative to the constant natural mortality axiom?.
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abstractFor a limited sample of highly fecund marine organisms a simple, two-parameter reciprocal function of age is a reasonable, and mathematically parsimonious, description of the form of the life history M-vector 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 4-5 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 length-based methods, and its analogies with crustacean moulting models, are discussed.
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