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Related Experiment Video

Updated: Apr 23, 2026

A Temperature Gradient Assay to Determine Thermal Preferences of Drosophila Larvae

A Temperature Gradient Assay to Determine Thermal Preferences of Drosophila Larvae

Published on: June 25, 2018

Functional trait space and the latitudinal diversity gradient.

Christine Lamanna¹, Benjamin Blonder², Cyrille Violle³

¹Sustainability Solutions Initiative and.

Proceedings of the National Academy of Sciences of the United States of America

|September 17, 2014

Summary

This summary is machine-generated.

Ecological theories struggle to explain biodiversity gradients. This study found environmental filtering shapes local and regional plant trait diversity, but no single theory fully explains the observed patterns across latitudes.

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Area of Science:

Ecology
Biodiversity Science
Trait-based Ecology

Background:

Latitudinal gradients in species richness are a key pattern in ecology.
Existing theories like competitive exclusion, neutral dynamics, and environmental filtering predict varying functional diversity patterns at multiple scales.
Understanding these patterns is crucial for explaining biodiversity origins.

Purpose of the Study:

To test ecological theories' predictions for functional diversity variation across spatial scales (alpha, beta, gamma).
To investigate how plant functional traits (specific leaf area, plant height, seed mass) vary with latitude in New World tree assemblages.
To determine which ecological processes best explain observed trait diversity patterns.

Main Methods:

Quantified hypervolumes of functional traits in tree assemblages across temperate and tropical regions.
Analyzed trait volume at alpha (local), beta (among-assemblage), and gamma (regional) scales.
Compared observed patterns with predictions from environmental filtering, competitive exclusion, and neutral dynamics theories.

Main Results:

Alpha-scale trait volume decreased with latitude, aligning with environmental filtering.
Beta-scale trait overlap decayed faster with distance in temperate zones, also supporting environmental filtering.
Gamma-scale trait space exhibited a hump-shaped relationship with latitude, unsupported by current theories.
Temperate regions showed larger overall trait hypervolumes than tropical regions.

Conclusions:

Environmental filtering appears to be a significant driver of local and regional plant trait diversity.
No single ecological theory consistently explains all observed functional diversity patterns across spatial scales.
Multiple, interacting processes likely shape trait diversity gradients, with potential differences in niche packing between temperate and tropical zones.