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5 results for “Sceloporus undulatus”
Effects of mite load on growth and body condition in Sceloporus undulatus
<p class="MsoNormal"><span>Parasitism is nearly ubiquitous in animals and is frequently associated with fitness costs in host organisms, including reduced growth, foraging, and reproduction. In many species, males tend to be more heavily parasitized than females and thus may bear greater costs of parasitism.</span><em> Sceloporus undulatus </em><span>is a female-larger, sexually-size dimorphic lizard species that is heavily parasitized by chigger mites (</span><em><span>Eutrombicula alfreddugesi</span></em>)<span>. In particular, the intensity of mite parasitism is higher in male than in female juveniles during the period of time when sex differences in growth rate lead to the development of sexual size dimorphism (SSD). Sex-biased differences in fitness costs of parasitism have been documented in other species. We investigated whether there are growth costs of mite ectoparasitism, at a time coinciding with sex differences in growth rate and the onset of SSD. If there are sex-biased growth costs of parasitism, then this could suggest a contribution to the development of SSD in</span><em> S. undulatus</em><span>. We measured growth and mite loads in two cohorts of unmanipulated, field-active yearlings by conducting descriptive mark-recapture studies during the activity seasons of 2016 and 2019. Yearling males had consistently higher mid-summer mite loads and consistently lower growth rates than females. However, we found that growth rate and body condition were independent of mite load in both sexes. Furthermore, growth rates</span><em> and </em><span>mite loads were higher in 2019 than in 2016. Our findings suggest that juveniles of</span><em> S. undulatus </em><span>are highly tolerant of chigger mites and that any costs imposed by mites may be at the expense of functions other than growth. We conclude that sex-biased mite ectoparasitism does not contribute to sex differences in growth rate and, therefore, does not contribute to the development of SSD.</span></p>
Effects of mite load on growth and body condition in Sceloporus undulatus
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FIG. 3 in Body Color and Morphological Correlates of Fitness in Eastern Fence Lizards (Sceloporus undulatus): A Spectrophotometric Approach
FIG. 3.—Significant regressions of abdominal body color against morphometric traits for female Eastern Fence Lizards (Sceloporus undulatus) collected in 2013 from Dauset Trails Nature Center (Butts County, GA). (A) Ventral UV chroma X snout-vent length (SVL), (B) ventral UV chroma X body condition, (C) ventral blue chroma X body condition, (D) dorsal hue X SVL, (E) dorsal UV chroma X SVL. Female dorsal hue was not normally distributed and did not normalize following transformation. Data for dorsal UV chroma were normalized using reciprocal transformations (see Methods), but the untransformed data are presented here for simplicity.
FIG. 2 in Body Color and Morphological Correlates of Fitness in Eastern Fence Lizards (Sceloporus undulatus): A Spectrophotometric Approach
FIG. 2.—Significant regressions of abdominal body color against morphometric traits for male Eastern Fence Lizards (Sceloporus undulatus) collected in 2013 from Dauset Trails Nature Center (Butts County, GA). (A) Ventral UV chroma X snout-vent length (SVL), (B) ventral blue chroma X SVL, (C) ventral blue chroma X patch area, (D) dorsal UV chroma X SVL. Values for UV chroma in panels A and D are depicted following a natural logarithmic transformation.
FIG. 1 in Body Color and Morphological Correlates of Fitness in Eastern Fence Lizards (Sceloporus undulatus): A Spectrophotometric Approach
FIG. 1.—Body coloration in adult Eastern Fence Lizards (Sceloporus undulatus) at 36°C. (A) Photographs of representative examples of male and female body color. (B) Mean spectral reflectance curves (males, n ¼ 28; females, n ¼ 12) of dorsal and ventral abdominal coloration. Solid brown line ¼ male dorsum; solid blue line ¼ male venter; dotted brown line ¼ female dorsum; dotted black line ¼ female venter. Spectral reflectance data from Stephenson et al. (2017). Republished with permission of the Linnean Society of London.
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