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Diversity Patterns of Dung Beetles along a Mediterranean Elevational Gradient
Cristina Mantoni1, Noelline Tsafack2, Ettore Palusci1
1Department of Life, Health and Environmental Sciences, University of L'Aquila, Via Vetoio, 67100 L'Aquila, Italy.
Insects
|September 26, 2021
Summary
Dung beetle diversity in Mediterranean mountains varies by habitat and elevation. Abundant scarabaeid beetles thrive in grasslands, while woodlands show increased diversity with elevation due to habitat changes.
Area of Science:
- Ecology
- Zoology
- Biodiversity research
Background:
- Most biodiversity-elevational pattern studies overlook species abundance.
- Hill numbers offer a comprehensive diversity assessment using abundance data.
- Previous dung beetle studies yielded inconsistent results due to habitat and gradient variations.
Purpose of the Study:
- To analyze dung beetle diversity patterns in a Mediterranean mountain ecosystem.
- To differentiate diversity responses across habitats (woodlands vs. grasslands) and taxonomic groups (scarabaeids, aphodiids).
- To investigate the influence of elevational gradients on dung beetle assemblages, considering species abundance.
Main Methods:
- Utilized Hill numbers to characterize dung beetle diversity profiles, incorporating species abundance.
- Compared diversity metrics between woodlands and grasslands at varying elevations.
- Focused on scarabaeid and aphodiid beetle families within a central Italian mountain range.
Main Results:
- Dung beetle abundance and diversity were higher in grasslands than in woodlands.
- Scarabaeids, the most abundant group, showed adaptation to warmer, drier high-elevation conditions via subterranean nesting.
- Woodland diversity increased with elevation due to forest thinning, while grassland diversity decreased with elevation due to harsher conditions.
Conclusions:
- Dung beetle elevational diversity patterns are influenced by a trade-off between habitat availability and environmental conditions.
- Habitat type significantly modulates dung beetle responses to elevation.
- Species' life history traits, such as nesting behavior, play a crucial role in elevational distribution.
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