Reproductive trade-offs in the colorado checkered whiptail lizard (Aspidoscelis neotesselatus): an examination of the relationship between clutch and follicle size

Life history theory predicts that there should be an inverse relationship between offspring size and number, because individuals cannot simultaneously maximize both when resources are limited. Although extensively studied in avian species, the occurrence determinants of reproductive tradeoffs oviparous reptiles far less understood, particularly parthenogenetic species. We this trade-off Colorado Checkered Whiptail, Aspidoscelis neotesselatus, a female-only lizard. Using data previously collected 2018 2019, we tested for clutch egg trade-offs determined whether could influenced by female aspects physiological condition. Physiological condition included energy-mobilizing hormone (i.e. corticosterone ‘CORT’), oxidative stress reactive oxygen metabolites ‘ROMs’), innate immune function (bacterial killing ability ‘BKA’). found effect on follicle was significant, but not linear. Specifically, average larger females with clutches two follicles compared to one follicle, smaller three two. In addition, were produced regardless size. Neither CORT nor BKA affected However, ROMs did explain variability relationship: more elevated follicles. conclude body key life traits shape size, investments into come at cost damage.