An experimental study of the effects of weed invasion on lizard phenotypes |
| |
Authors: | Sharon Downes Anke-Maria Hoefer |
| |
Institution: | (1) School of Botany and Zoology, Australian National University, Canberra, ACT, 0200, Australia;(2) CSIRO Entomology, Australian Cotton Research Institute, Locked Bag 59, Narrabri, NSW, 2390, Australia |
| |
Abstract: | We examined how a weed affected the basking and activity of a diurnal lizard, and the potential cascading effects of these
shifts for life history strategies and expression of morphology. Hatchlings of the diurnal lizard Lampropholis
delicata were raised to maturity in outdoor enclosures that mimicked high, moderate and low invasion by a sprawling plant (blue periwinkle,
Vinca major). Skinks depend on sunlight for growth and maintenance. Periwinkle differs from displaced grassland by being structurally
complex and blocking sunlight. Lizards restricted to the enclosure floor achieved preferred body temperatures only when exposure
to periwinkle was moderate or low. However, lizards in high invasion enclosures could reach preferred body temperatures by
climbing plants and basking on exposed canopy. This shift in basking strategy resulted in lizards growing longer hind limbs
compared with animals that rarely (moderate invasion) and never (low invasion) climbed plants. Consequently, lizards reared
in high invasion enclosures sprinted faster than conspecifics reared in lower invasion environments. Throughout the study
there was no significant variation among treatments in the tendency of animals to be moving when they were not hidden. However,
lizards in high invasion treatments hid more often during the day, were lighter in body mass, and females had lighter clutch
masses and offspring than did those from moderate and low invasion enclosures. Thus, microhabitat degradation can drive a
cascade of changes to an animal’s ecology. |
| |
Keywords: | Microhabitat Thermoregulation Life history Phenotypic plasticity Invasion |
本文献已被 PubMed SpringerLink 等数据库收录! |
|