Infectious diseases are considered as a significant factor in the global decline of amphibians. In some vertebrates, the assessment of the individual sexual traits can be useful for assessment of their health status and immunocompetence due to trade-off between them and investment in the immune system. Our aim here was to determine whether the trade-off between the expression of sexual morphological and behavioral traits and investment in the immune system is present in an urodele, the Palmate newt (Lissotriton helveticus). The groups of males were injected by solutions of proinflammatory agent, lipopolysaccharide (LPS) from Escherichia coli serotype O:55:B5, at dosages toxic to vertebrates (2 and 10 mg/kg of body mass) or by saline solution only (control groups). They were subsequently measured for variations in body condition and expression of both morphological (filament length, hind-foot-web, crest) and behavioral (courtship frequency) sexual traits. The injection of either LPS or saline solution did not cause any adverse effect on health in any male of all groups. No significant differences in any of the sexual traits were observed between two groups of males injected by LPS and control groups of males indicating the absence of a trade-off between immune response and expression of sexual traits. Our result suggests that measuring morphological or behavioral sexual traits may not be a useful method for monitoring emergence of infectious diseases in the palmate newt.
Deacreased sexual signaling reveals reduced viability in small populations of the drumming wolf spider Hygrolycosa rubrofasciata.
Proc. R. Soc. Lond. B271:
Antibody-production by different sites and cyclophosphamide-induced immunosuppression of the TNP-LPS response in the Grass frog Rana pipiens.
Dev. Comp. Immunol.7:
Pathological and microbiological findings from incidents of unusual mortality of the common frog (Rana temporaria).
Phil. Trans. R. Soc. Lond. B351:
HayesT.B.CaseP.ChuiS.ChungD.HaeffeleC.HastonK.LeeM.Phoung MaiV.MarjuoaY.ParkerJ.TsuiM. (2006):
Pesticide mixtures, endocrine disruption, and amphibian declines: are we underestimating the impact?Environ. Health Perspect.114(Suppl. 1):
Responding to inflammatory challenges is less costly for a successful avian invader, the house sparrow (Passer domesticus), than its less-invasive congener.
Behavioral responses to immune-system activation in an Anuran (the Cane toad, Bufo marinus): field and laboratory studies.
Physiol. Biochem. Zool.84:
Lipopolysaccharide, a key molecule involved in the synergism between temporins in inhibiting bacterial growth and in endotoxin neutralization.
J. Biol. Chem.283:
A paneth cell analogue in Xenopus small intestine expresses antimicrobial peptide genes: conservation of an intestinal host-defense system.
J. Histochem. Cytochem.42:
Immune defenses against Batrachochytrium dendrobatidis, a fungus linked to global amphibian declines, in the South African clawed frog, Xenopus laevis.
Molecular cloning of the gene for interleukin-1β from Xenopus laevis and analysis of expression in vivo and in vitro.