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Stem characteristics and ant body size in a Costa Rican rain forest

Published online by Cambridge University Press:  13 February 2012

Stephen P. Yanoviak*
Department of Biology, University of Arkansas at Little Rock, Little Rock, Arkansas 72204USA
Cheryl Silveri
Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas 72701USA
Christopher A. Hamm
Department of Entomology, Michigan State University, 243 Natural Sciences, East Lansing, Michigan 48864USA Program in Ecology, Evolutionary Biology and Behavior, Michigan State University, East Lansing, Michigan 48864USA
Manuel Solis
Departamento de Entomología, Instituto Nacional de Biodiversidad (INBio), Santo Domingo, Heredia, Costa Rica
1Corresponding author. Email:


Climbing plants provide efficient pathways for ants to access patchy arboreal resources. However, plant stems vary greatly in physical characteristics that are likely to influence ant locomotion. We collected, measured and identified ants foraging on 671 stems of climbing plants at the La Selva Biological Station, Costa Rica. We applied tuna baits to 70% of the observed stems to attract ants to a broad range of stem sizes. We used these data to examine relationships between relative stem roughness, growth form (herbaceous or woody), stem diameter and the body length of foraging ants representing 58 species. The size of the largest ants found on stems generally increased with stem size up to 3.2 mm diameter, whereas the size of the smallest ants present on stems did not vary with stem diameter. The largest ants in the forest (Paraponera clavata) used small stems (<2.7 mm diameter) only when attracted by baits. Average (± SE) ant body length was larger on woody (5.2 ± 0.32 mm) vs. herbaceous (3.3 ± 0.53 mm) stems, but did not differ between rough and smooth stems within these categories. Ant body-size distribution tended toward unimodality on smooth stems. We conclude that small stem diameter acts as a habitat filter based on ant body size, but only for the largest ants in the forest. The filter effect is reduced when ants are attracted to an artificially high quality resource.

Research Article
Copyright © Cambridge University Press 2012

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