Morphometry of Growth in Hatchling Striped Plateau Lizards (Iguanidae: Sceloporus virgatus)

Striped plateau lizards (Sceloporus virgatus) do not exhibit behavioral syndromes in exploratory and anti-predator contexts

Genetic Differentiation among Mountain Island Populations of the Striped Plateau Lizard, Sceloporus virgatus (Squamata: Phrynosomatidae)

We used DNA sequences from several mitochondrial regions (ND2, ND4, and adjacent tRNAs) to examine genetic structure and divergence among populations of the Striped Plateau Lizard, Sceloporus virgatus. In the northern portion of this species’ range, populations occupy mesic habitats at higher elevations in the mountain ranges of the Madrean Archipelago, and are thus isolated by dry, inhospitabl...

Increased mite parasitism as a cost of testosterone in male striped plateau lizards Sceloporus virgatus

1. Testosterone (T) co-ordinates the seasonal and sex-specific expression of numerous physiological, behavioural and morphological traits that contribute to male reproductive success. However, increased susceptibility to parasitism has been proposed as a potential cost of elevated plasma T. 2. During the spring breeding season, male striped plateau lizards Sceloporus virgatus harbour significan...

Pterin-based ornamental coloration predicts yolk antioxidant levels in female striped plateau lizards (Sceloporus virgatus).

1. Maternal investment in egg quality can have important consequences for offspring fitness. For example, yolk antioxidants can affect embryonic development as well as juvenile and adult phenotype. Thus, females may be selected to advertise their yolk antioxidant deposition to discriminatory males via ornamental signals, perhaps depending on the reproductive costs associated with signal product...

Gonadal modulation of in vitro steroidogenic properties of dispersed adrenocortical cells from Sceloporus lizards.

Effects of adrenal corticosteroids on reproductive and endocrine functions of the gonads are well known, but reciprocal effects of gonadal hormones on the hypothalamo-pituitary-adrenal (HPA) axis and on adrenocortical steroidogenesis in particular have received much less attention. We investigated effects of gonadectomy and testosterone (T) replacement on adrenocortical cell function in a year-...