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Title: Individual Variation in Life History Characteristics Can Influence Extinction Risk

Abstract

The white sturgeon (Acipenser transmontanus) shows great individual variation in the age at maturation. This study examines the consequences of model assumptions about individual variation in the age at maturation on predicted population viability. I considered: (1) the effects of variation in age at maturation alone; (2) the effects of heritability; and (3) the influence of a stable and an altered selective regime. Two selective regimes represented conditions before and after the impoundment of a river, blocking access of anadromous white sturgeon populations to the ocean. In contrast to previous simulation studies, I found that increased individual variation in the age at maturity did not necessarily lead to a higher likelihood of persistence. Individual variation increased the simulated likelihood of persistence when the variation was heritable and the selective regime had changed such that the mean age at maturity was no longer optimal.

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
859591
Report Number(s):
P99-104747
Journal ID: ISSN 0304-3800; ECMODT; TRN: US200522%%244
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Ecological Modelling
Additional Journal Information:
Journal Volume: 144; Journal Issue: 1; Journal ID: ISSN 0304-3800
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SIMULATION; VIABILITY; GENETICS; ECOLOGY; individual based model; genetic model; population viability; analysis; persistence; extinction; age at maturation

Citation Formats

Jager, H I. Individual Variation in Life History Characteristics Can Influence Extinction Risk. United States: N. p., 2001. Web. doi:10.1016/S0304-3800(01)00362-3.
Jager, H I. Individual Variation in Life History Characteristics Can Influence Extinction Risk. United States. https://doi.org/10.1016/S0304-3800(01)00362-3
Jager, H I. 2001. "Individual Variation in Life History Characteristics Can Influence Extinction Risk". United States. https://doi.org/10.1016/S0304-3800(01)00362-3.
@article{osti_859591,
title = {Individual Variation in Life History Characteristics Can Influence Extinction Risk},
author = {Jager, H I},
abstractNote = {The white sturgeon (Acipenser transmontanus) shows great individual variation in the age at maturation. This study examines the consequences of model assumptions about individual variation in the age at maturation on predicted population viability. I considered: (1) the effects of variation in age at maturation alone; (2) the effects of heritability; and (3) the influence of a stable and an altered selective regime. Two selective regimes represented conditions before and after the impoundment of a river, blocking access of anadromous white sturgeon populations to the ocean. In contrast to previous simulation studies, I found that increased individual variation in the age at maturity did not necessarily lead to a higher likelihood of persistence. Individual variation increased the simulated likelihood of persistence when the variation was heritable and the selective regime had changed such that the mean age at maturity was no longer optimal.},
doi = {10.1016/S0304-3800(01)00362-3},
url = {https://www.osti.gov/biblio/859591}, journal = {Ecological Modelling},
issn = {0304-3800},
number = 1,
volume = 144,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2001},
month = {Mon Jan 01 00:00:00 EST 2001}
}