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Incubation under climate warming affects learning ability and survival in hatchling lizards
Buddhi Dayananda1, Jonathan K Webb2
1School of Life Sciences, University of Technology Sydney, Broadway, New South Wales 2007, Australia.
Biology Letters
|March 17, 2017
Summary
Warmer incubation temperatures impair spatial learning in velvet gecko hatchlings. This reduced cognitive ability negatively impacts their survival in the wild, highlighting climate change effects on reptile fitness.
Area of Science:
- Ecology
- Animal Behavior
- Climate Change Biology
Background:
- Cognitive performance varies significantly among individuals, but its influence on wild animal fitness remains understudied.
- Environmental stressors during embryonic development, such as incubation temperature in reptiles, can shape offspring cognitive abilities.
- Climate warming may increase egg temperatures, potentially altering hatchling cognition and survival in lizards.
Purpose of the Study:
- To investigate if incubation temperature-induced changes in spatial learning ability affect hatchling survival in the velvet gecko (Amalosia lesueurii).
- To assess the impact of simulated future climate warming on reptile cognitive function and fitness.
Main Methods:
- Velvet gecko eggs were incubated under two fluctuating temperature regimes: current (cold) and future (hot) conditions.
- Hatchling spatial learning ability was assessed for each temperature treatment.
- Individually marked hatchlings were released into natural field sites to monitor survival rates.
Main Results:
- Hatchlings incubated at higher temperatures exhibited significantly slower spatial learning compared to those from cooler incubations.
- Survival analyses demonstrated a positive correlation between higher spatial learning scores and increased hatchling survival.
- Incubation temperature directly influences spatial learning capacity, with implications for wild survival.
Conclusions:
- Incubation temperature is a critical factor affecting cognitive abilities in hatchling lizards.
- Changes in cognitive performance due to altered incubation temperatures can significantly impact the survival and fitness of young reptiles.
- These findings underscore the potential ecological consequences of climate warming on wildlife populations.
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