< Terug naar vorige pagina

Publicatie

Immunocompetence and parasite infestation in a melanistic and normally-coloured population of the lacertid lizard, **Podarcis siculus**

Tijdschriftbijdrage - Tijdschriftartikel

Melanism is the occurrence of individuals that are darker in skin pigmentation than their conspecifics, which is a common colour polymorphism among vertebrates. Due to the pleotropic effects of the POMC gene that is responsible for melanin-based colouration, dark pigmentation often co-varies with a range of other phenotypic traits. Still, not much is known on the link between melanin-based colouration and immunity in lizards. In this study, we examined and compared the immunocompetence and degree of ectoparasite infestation of Podarcis siculus lizards from a fully melanistic population on an islet in the Tyrrhenian Sea, with conspecifics from a normally-coloured population on the mainland. Our findings show that both males and females from the melanistic population were less parasitized by ectoparasites and had a greater cellular immune response to a phytohemagglutinin injection than normally-coloured conspecifics. This outcome is in line with the genetic link hypothesis, which predicts that melanistic individuals will be more resistant to parasites than non-melanistic individuals due to the pleiotropic POMC gene. In addition, we found correlative evidence for a link between ectoparasite load and PHA immune response, but this was only true for males from the normally-coloured population. Immunological data on additional melanistic and non-melanistic populations of Podarcis siculus in the Mediterranean basin would provide us better insight into patterns of co-variation between immunity and melanism in lizards.
Tijdschrift: Amphibia-reptilia
ISSN: 0173-5373
Volume: 39
Pagina's: 471 - 478
Jaar van publicatie:2018
Trefwoorden:A1 Journal article
BOF-keylabel:ja
BOF-publication weight:1
CSS-citation score:2
Auteurs:International
Authors from:Higher Education
Toegankelijkheid:Open