Advanced

Carotenoid and protein supplementation have differential effects on pheasant ornamentation and immunity

Smith, Henrik LU ; Råberg, Lars LU ; Ohlsson, Thomas LU ; Granbom, Martin LU and Hasselquist, Dennis LU (2007) In Journal of Evolutionary Biology 20(1). p.310-319
Abstract
A currently popular hypothesis states that the expression of carotenoid-dependent sexual ornaments and immune function may be correlated because both traits are positively affected by carotenoids. However, such a correlation may arise for another reason: it is well known that immune function is dependent on nutritional condition. A recent study has suggested that the expression of ornaments may too depend on nutritional condition, as males in good nutritional condition are better at assimilating and/or modulating carotenoids. Thus, carotenoid-dependent ornaments and immune function may be correlated because both are dependent on nutritional condition. To elucidate if, and how, ornamentation and immune function are linked, pheasant diets... (More)
A currently popular hypothesis states that the expression of carotenoid-dependent sexual ornaments and immune function may be correlated because both traits are positively affected by carotenoids. However, such a correlation may arise for another reason: it is well known that immune function is dependent on nutritional condition. A recent study has suggested that the expression of ornaments may too depend on nutritional condition, as males in good nutritional condition are better at assimilating and/or modulating carotenoids. Thus, carotenoid-dependent ornaments and immune function may be correlated because both are dependent on nutritional condition. To elucidate if, and how, ornamentation and immune function are linked, pheasant diets were supplemented with carotenoid and/or protein in a fully factorial experiment. Carotenoid treatment affected wattle coloration and tail growth, but not cellular or humoral immunity. Immunity was unrelated to males' initial ornamentation including wattle colour. Males in better body condition, measured as residual mass, increased their wattle coloration more when carotenoid supplemented. Protein positively affected humoral but not cellular immunity, but had no effect on ornaments. Cellular, but not humoral, immunity increased with male body condition. Thus, there was no evidence that an immune-stimulatory effect of carotenoids resulted in wattle coloration honestly signalling immune function, but wattle coloration may still signal male body condition. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
immune capacity, supplemental feeding, body condition, secondary sexual characters
in
Journal of Evolutionary Biology
volume
20
issue
1
pages
310 - 319
publisher
John Wiley & Sons
external identifiers
  • wos:000242904600039
  • scopus:33845704383
ISSN
1420-9101
DOI
10.1111/j.1420-9101.2006.01203.x
language
English
LU publication?
yes
id
dba006ba-8fb4-4519-8361-cfae0203e840 (old id 167081)
date added to LUP
2007-06-26 12:14:56
date last changed
2017-11-12 03:19:40
@article{dba006ba-8fb4-4519-8361-cfae0203e840,
  abstract     = {A currently popular hypothesis states that the expression of carotenoid-dependent sexual ornaments and immune function may be correlated because both traits are positively affected by carotenoids. However, such a correlation may arise for another reason: it is well known that immune function is dependent on nutritional condition. A recent study has suggested that the expression of ornaments may too depend on nutritional condition, as males in good nutritional condition are better at assimilating and/or modulating carotenoids. Thus, carotenoid-dependent ornaments and immune function may be correlated because both are dependent on nutritional condition. To elucidate if, and how, ornamentation and immune function are linked, pheasant diets were supplemented with carotenoid and/or protein in a fully factorial experiment. Carotenoid treatment affected wattle coloration and tail growth, but not cellular or humoral immunity. Immunity was unrelated to males' initial ornamentation including wattle colour. Males in better body condition, measured as residual mass, increased their wattle coloration more when carotenoid supplemented. Protein positively affected humoral but not cellular immunity, but had no effect on ornaments. Cellular, but not humoral, immunity increased with male body condition. Thus, there was no evidence that an immune-stimulatory effect of carotenoids resulted in wattle coloration honestly signalling immune function, but wattle coloration may still signal male body condition.},
  author       = {Smith, Henrik and Råberg, Lars and Ohlsson, Thomas and Granbom, Martin and Hasselquist, Dennis},
  issn         = {1420-9101},
  keyword      = {immune capacity,supplemental feeding,body condition,secondary sexual characters},
  language     = {eng},
  number       = {1},
  pages        = {310--319},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Carotenoid and protein supplementation have differential effects on pheasant ornamentation and immunity},
  url          = {http://dx.doi.org/10.1111/j.1420-9101.2006.01203.x},
  volume       = {20},
  year         = {2007},
}