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Comparative immunoecology in birds: hypotheses and tests

Hasselquist, Dennis LU (2007) In Journal für Ornithologie1852-12-31+01:002004-01-01+01:00 148(Supplement 2). p.571-582
Abstract
In this review, I focus on three key questions in avian comparative immunoecology: variation in immune responses in relation to sex; latitude (and pace-of-life); and the annual cycle. I present hypotheses and evaluate the so far rather scanty and heterogenic data to test them. Sex differences in immune responses have been hypothesized to be caused by inferior immune responses in the heterogametic sex (females in birds), sexual selection (males invest more in mate acquisition and less in immune function compared to females under polygyny, whereas the sexes invest equally in immune function under monogamy), or body size differences. Available data refute the heterogametic sex hypothesis, but tentatively support the sexual selection... (More)
In this review, I focus on three key questions in avian comparative immunoecology: variation in immune responses in relation to sex; latitude (and pace-of-life); and the annual cycle. I present hypotheses and evaluate the so far rather scanty and heterogenic data to test them. Sex differences in immune responses have been hypothesized to be caused by inferior immune responses in the heterogametic sex (females in birds), sexual selection (males invest more in mate acquisition and less in immune function compared to females under polygyny, whereas the sexes invest equally in immune function under monogamy), or body size differences. Available data refute the heterogametic sex hypothesis, but tentatively support the sexual selection hypothesis. Latitudinal patterns of immune responses have been hypothesized to be adjusted to parasite pressure, pace-of-life or breeding season stress. In passerine birds, species breeding closer to the equator (where parasites presumably are more abundant) tended to show stronger humoral but not cell-mediated immune responses. Annual patterns of immune responses could be related to melatonin levels or adjusted to seasonal differences in parasite exposure (high exposure in tropical migrants in winter and in temperate breeding birds in summer). The results from studies of immune responses over the annual cycle in birds show no clear pattern over the annual cycle and there is little consistency between different components of the immune system. Clearly, to facilitate further testing of these intriguing ideas in comparative immunoecology, more studies on non-domesticated birds are needed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Sex dimorphism in immunity - Pace-of-life - Immunocompetence - Latitudinal patterns - Seasonal changes in immunity
in
Journal für Ornithologie1852-12-31+01:002004-01-01+01:00
volume
148
issue
Supplement 2
pages
571 - 582
publisher
Springer
external identifiers
  • wos:000255199000051
  • scopus:36949012272
ISSN
1439-0361
DOI
10.1007/s10336-007-0201-x
project
Costs of the immune system and maternal effects
language
English
LU publication?
yes
id
5967230f-d169-40d2-8558-b9b45c1da844 (old id 786953)
date added to LUP
2008-01-02 20:59:50
date last changed
2017-07-02 03:27:21
@article{5967230f-d169-40d2-8558-b9b45c1da844,
  abstract     = {In this review, I focus on three key questions in avian comparative immunoecology: variation in immune responses in relation to sex; latitude (and pace-of-life); and the annual cycle. I present hypotheses and evaluate the so far rather scanty and heterogenic data to test them. Sex differences in immune responses have been hypothesized to be caused by inferior immune responses in the heterogametic sex (females in birds), sexual selection (males invest more in mate acquisition and less in immune function compared to females under polygyny, whereas the sexes invest equally in immune function under monogamy), or body size differences. Available data refute the heterogametic sex hypothesis, but tentatively support the sexual selection hypothesis. Latitudinal patterns of immune responses have been hypothesized to be adjusted to parasite pressure, pace-of-life or breeding season stress. In passerine birds, species breeding closer to the equator (where parasites presumably are more abundant) tended to show stronger humoral but not cell-mediated immune responses. Annual patterns of immune responses could be related to melatonin levels or adjusted to seasonal differences in parasite exposure (high exposure in tropical migrants in winter and in temperate breeding birds in summer). The results from studies of immune responses over the annual cycle in birds show no clear pattern over the annual cycle and there is little consistency between different components of the immune system. Clearly, to facilitate further testing of these intriguing ideas in comparative immunoecology, more studies on non-domesticated birds are needed.},
  author       = {Hasselquist, Dennis},
  issn         = {1439-0361},
  keyword      = {Sex dimorphism in immunity - Pace-of-life - Immunocompetence - Latitudinal patterns - Seasonal changes in immunity},
  language     = {eng},
  number       = {Supplement 2},
  pages        = {571--582},
  publisher    = {Springer},
  series       = {Journal für Ornithologie1852-12-31+01:002004-01-01+01:00},
  title        = {Comparative immunoecology in birds: hypotheses and tests},
  url          = {http://dx.doi.org/10.1007/s10336-007-0201-x},
  volume       = {148},
  year         = {2007},
}