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Disparate maturation adaptations to size-dependent mortality

Gårdmark, Anna LU and Dieckmann, U (2006) In Royal Society of London. Proceedings B. Biological Sciences 273(1598). p.2185-2192
Abstract
Body size is an important determinant of resource use, fecundity and mortality risk. Evolution of maturation size in response to size-dependent selection is thus a fundamental part of life-history theory. Increased mortality among small individuals has previously been predicted to cause larger maturation size, whereas increased mortality among large individuals is expected to have the opposite effect. Here we use a continuously size-structured model to demonstrate that, contrary to these widespread expectations, increased mortality among small individuals can have three alternative effects: maturation size may increase, decrease or become evolutionarily bistable. We show that such complex responses must be reckoned with whenever mortality... (More)
Body size is an important determinant of resource use, fecundity and mortality risk. Evolution of maturation size in response to size-dependent selection is thus a fundamental part of life-history theory. Increased mortality among small individuals has previously been predicted to cause larger maturation size, whereas increased mortality among large individuals is expected to have the opposite effect. Here we use a continuously size-structured model to demonstrate that, contrary to these widespread expectations, increased mortality among small individuals can have three alternative effects: maturation size may increase, decrease or become evolutionarily bistable. We show that such complex responses must be reckoned with whenever mortality is size-dependent, growth is indeterminate, reproduction impairs growth and fecundity increases with size. Predicting adaptive responses to altered size-dependent mortality is thus inherently difficult, since, as demonstrated here, such mortality cannot only reverse the direction of but also cause abrupt shifts in evolutionarily stable maturation sizes. (Less)
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publication status
published
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in
Royal Society of London. Proceedings B. Biological Sciences
volume
273
issue
1598
pages
2185 - 2192
publisher
Royal Society Publishing
external identifiers
  • wos:000240104300012
  • scopus:33748254687
ISSN
1471-2954
DOI
10.1098/rspb.2006.3562
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical ecology (Closed 2011) (011006011)
id
81c28a71-0845-48e6-a256-d43fbdda0b2c (old id 162669)
date added to LUP
2016-04-01 11:48:12
date last changed
2021-06-30 01:56:47
@article{81c28a71-0845-48e6-a256-d43fbdda0b2c,
  abstract     = {Body size is an important determinant of resource use, fecundity and mortality risk. Evolution of maturation size in response to size-dependent selection is thus a fundamental part of life-history theory. Increased mortality among small individuals has previously been predicted to cause larger maturation size, whereas increased mortality among large individuals is expected to have the opposite effect. Here we use a continuously size-structured model to demonstrate that, contrary to these widespread expectations, increased mortality among small individuals can have three alternative effects: maturation size may increase, decrease or become evolutionarily bistable. We show that such complex responses must be reckoned with whenever mortality is size-dependent, growth is indeterminate, reproduction impairs growth and fecundity increases with size. Predicting adaptive responses to altered size-dependent mortality is thus inherently difficult, since, as demonstrated here, such mortality cannot only reverse the direction of but also cause abrupt shifts in evolutionarily stable maturation sizes.},
  author       = {Gårdmark, Anna and Dieckmann, U},
  issn         = {1471-2954},
  language     = {eng},
  number       = {1598},
  pages        = {2185--2192},
  publisher    = {Royal Society Publishing},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {Disparate maturation adaptations to size-dependent mortality},
  url          = {http://dx.doi.org/10.1098/rspb.2006.3562},
  doi          = {10.1098/rspb.2006.3562},
  volume       = {273},
  year         = {2006},
}