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Related Experiment Video

Updated: Jul 11, 2026

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments

Published on: May 21, 2019

Multiple techniques confirm elevational differences in insect size that may influence spider sociality.

Jennifer Guevara¹, Leticia Avilés

¹Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.

|September 11, 2007

Summary

Social and subsocial spiders in the genus Anelosimus show distinct altitudinal distributions. Larger insects in lowland forests explain why social spiders thrive there, while smaller high-elevation insects support subsocial species.

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Area of Science:

Ecology
Zoology
Behavioral Ecology

Background:

Social and subsocial spiders of the genus Anelosimus display distinct altitudinal distribution patterns in the Americas.
Social species inhabit lowland rainforests, while subsocial species are found at higher elevations.
Previous research suggested prey size differences along altitudinal gradients as a potential driver for this distribution.

Purpose of the Study:

To investigate the relationship between spider distribution and insect prey size across altitudinal gradients.
To address potential under-sampling of insect size composition in previous studies by employing diverse collection methods.

Main Methods:

Utilized multiple insect collection methods (visual searching, blacklighting, beating, sweeping, malaise trapping) to sample insect size composition.
Compared insect sizes captured in lowland rainforests versus high-elevation cloud forests in eastern Ecuador.
Correlated insect prey size with the habitats of social and subsocial Anelosimus spiders.

Main Results:

Confirmed that average insect size is larger in lowland rainforests compared to high-elevation cloud forests.
All employed sampling techniques consistently captured larger insects in lowland habitats.
Spider colonies in lowlands captured larger prey than those at higher elevations, aligning with insect size distributions.

Conclusions:

The study supports the hypothesis that differences in insect prey size along altitudinal gradients influence the distribution of social and subsocial Anelosimus spiders.
Employing diverse sampling methods provides a more accurate assessment of insect prey availability for spiders.
Prey size availability is a significant factor structuring Anelosimus spider communities across tropical latitudes.