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Life-history traits as causes or consequences of social behaviour: why do cooperative breeders lay small clutches?

Härdling, Roger LU and Kokko, H (2003) In Evolutionary Ecology Research 5(5). p.691-700
Abstract
Cooperatively breeding birds tend to exhibit high adult survival and relatively small clutch sizes. According to the life-history hypothesis for cooperative breeding, high survival creates conditions for philopatry based on difficulties that dispersers face when competing for territories in a landscape with slow territory turnover. However, this hypothesis evokes a puzzle because high fecundity should also lead to problems in territory acquisition because of the large number of competitors for each vacancy. We suggest two reasons for the observed association between small clutch size, high survival rate and cooperative breeding in birds. The first reason is that when survival rate is a better predictor of cooperative breeding than... (More)
Cooperatively breeding birds tend to exhibit high adult survival and relatively small clutch sizes. According to the life-history hypothesis for cooperative breeding, high survival creates conditions for philopatry based on difficulties that dispersers face when competing for territories in a landscape with slow territory turnover. However, this hypothesis evokes a puzzle because high fecundity should also lead to problems in territory acquisition because of the large number of competitors for each vacancy. We suggest two reasons for the observed association between small clutch size, high survival rate and cooperative breeding in birds. The first reason is that when survival rate is a better predictor of cooperative breeding than fecundity, a general life-history trade-off between clutch size and survival rate will create the observed association between cooperative breeding and the two life-history characters. Theoretically, a high survival rate is expected to predict cooperative breeding better than fecundity, because a high survival rate increases both habitat saturation and the direct benefits of staying at home. The second reason is that the reproductive value of the first offspring each year is higher than that of subsequent offspring for cooperative breeders (the offspring depreciation hypothesis). This is because these offspring will be able to delay dispersal and gain indirect benefits by helping at home. We show that this. under very general conditions, decreases the optimum clutch size of cooperative breeders below that of non-cooperative breeders. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Evolutionary Ecology Research
volume
5
issue
5
pages
691 - 700
publisher
Evolutionary Ecology Ltd
external identifiers
  • wos:000184445800004
  • scopus:0242494568
ISSN
1522-0613
language
English
LU publication?
yes
id
55ad8a65-3c34-4b9f-9056-201ae3ba2c1c (old id 137230)
alternative location
http://www.evolutionary-ecology.com/issues/v05n05/ffar1525.pdf
date added to LUP
2007-06-25 12:05:48
date last changed
2018-01-07 09:16:14
@article{55ad8a65-3c34-4b9f-9056-201ae3ba2c1c,
  abstract     = {Cooperatively breeding birds tend to exhibit high adult survival and relatively small clutch sizes. According to the life-history hypothesis for cooperative breeding, high survival creates conditions for philopatry based on difficulties that dispersers face when competing for territories in a landscape with slow territory turnover. However, this hypothesis evokes a puzzle because high fecundity should also lead to problems in territory acquisition because of the large number of competitors for each vacancy. We suggest two reasons for the observed association between small clutch size, high survival rate and cooperative breeding in birds. The first reason is that when survival rate is a better predictor of cooperative breeding than fecundity, a general life-history trade-off between clutch size and survival rate will create the observed association between cooperative breeding and the two life-history characters. Theoretically, a high survival rate is expected to predict cooperative breeding better than fecundity, because a high survival rate increases both habitat saturation and the direct benefits of staying at home. The second reason is that the reproductive value of the first offspring each year is higher than that of subsequent offspring for cooperative breeders (the offspring depreciation hypothesis). This is because these offspring will be able to delay dispersal and gain indirect benefits by helping at home. We show that this. under very general conditions, decreases the optimum clutch size of cooperative breeders below that of non-cooperative breeders.},
  author       = {Härdling, Roger and Kokko, H},
  issn         = {1522-0613},
  language     = {eng},
  number       = {5},
  pages        = {691--700},
  publisher    = {Evolutionary Ecology Ltd},
  series       = {Evolutionary Ecology Research},
  title        = {Life-history traits as causes or consequences of social behaviour: why do cooperative breeders lay small clutches?},
  volume       = {5},
  year         = {2003},
}