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Technique for Studying Arthropod and Microbial Communities within Tree Tissues

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Published on: November 16, 2014

Dung beetle communities: a neotropical-north temperate comparison.

Meghan G Radtke¹, Cláudio R V da Fonseca, G Bruce Williamson

¹Dept of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA. kc7moc@cisaz.com

Neotropical Entomology

|March 23, 2010

Summary

Tropical dung beetle communities exhibit higher species richness than temperate ones. However, temperate beetles are larger, and abundance varied regionally, not between tropical and temperate zones.

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Area of Science:

Ecology
Biodiversity Studies
Insect Ecology

Background:

Tropical ecosystems often display higher biodiversity than temperate regions.
Previous studies suggest tropical dung beetle communities are more diverse, but used varied methodologies.
Bergmann's rule predicts larger body size in cooler climates.

Purpose of the Study:

To compare dung beetle communities across neotropical and north temperate forests using a standardized protocol.
To investigate latitudinal patterns in dung beetle species richness, abundance, and body size.
To explore factors influencing community structure, such as soil productivity.

Main Methods:

Standardized sampling protocol across five neotropical forests (Brazil, Ecuador) and two north temperate forests (USA).
Comparison of species richness, abundance, body size, and community similarity.
Analysis of species rank-abundance and rank-volume distributions.

Main Results:

Tropical forests showed 3-7 times higher species richness than temperate forests.
Temperate forest dung beetles had larger average body size, supporting Bergmann's rule.
Dung beetle abundance and volume per trap-day were higher in Ecuador than Brazil, and in Mississippi than Louisiana, with no overall tropical-temperate difference.
Community similarity was high within countries but low between countries.

Conclusions:

Standardized sampling confirms higher species richness in tropical dung beetle communities.
Body size patterns align with Bergmann's rule, but abundance and volume show regional variations.
Differences between neotropical sites may relate to soil age and productivity, highlighting complex ecological drivers.