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Three energy variables predict ant abundance at a geographical scale
M Kaspari1, L Alonso, S O'Donnell
1Department of Zoology, University of Oklahoma, Norman 73019-0235, USA. mkaspari@ou.edu
Proceedings. Biological Sciences
|March 29, 2000
Summary
Ground nesting ant abundance is linked to energy availability and temperature. Seasonal sites with colder winters support higher ant populations, offering insights into climate change impacts on ectotherms.
Area of Science:
- Ecology
- Zoology
- Climate Change Biology
Background:
- Energy theory suggests temperature influences ectotherm abundance.
- Ectotherms, like ants, rely on external heat sources and energy availability.
- Geographical gradients in temperature and productivity impact species distribution.
Purpose of the Study:
- To investigate the relationship between ground nesting ant abundance and environmental factors.
- To test predictions of energy theory regarding ectotherm abundance.
- To assess the potential of these factors in predicting biotic responses to climate change.
Main Methods:
- Surveyed 49 New World habitats for ground nesting ant abundance (nests m(-2)).
- Correlated ant abundance with net primary productivity, mean temperature, and winter seasonality.
- Utilized statistical analysis to determine the significance of environmental variables.
Main Results:
- Ant abundance showed a strong positive correlation with net primary productivity (r2=0.55).
- Abundance increased with mean temperature (r2=0.056), indicating temperature constraints on foraging.
- Seasonal sites with longer, colder winters supported higher ant abundance (r2=0.082).
Conclusions:
- Net primary productivity, mean temperature, and winter seasonality are key drivers of ground nesting ant abundance.
- These factors are crucial for understanding how ectotherm populations may respond to global climate change.
- The findings provide a basis for predicting future changes in ant populations and other ectotherms.