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Related Experiment Video

Updated: Apr 28, 2026

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

Cross-scale interactions and the distribution-abundance relationship.

Earl E Werner¹, Christopher J Davis¹, David K Skelly²

¹Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, United States of America.

|May 31, 2014

Summary

Distribution-abundance relationships in ecology are clarified by this study. Amphibian metacommunity dynamics reveal that local densities, influenced by climate, drive species distribution shifts, highlighting cross-scale interactions.

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Area of Science:

Ecology
Metacommunity Dynamics
Conservation Biology

Background:

Distribution-abundance (d-a) relationships are ubiquitous ecological patterns, yet their underlying mechanisms remain poorly understood.
Hypotheses exist, but empirical evidence linking local population dynamics to regional distribution patterns is needed.
Understanding these relationships is crucial for predicting species responses to environmental change and habitat fragmentation.

Purpose of the Study:

To investigate intra- and interspecific distribution-abundance relationships in an amphibian metacommunity.
To identify the mechanisms driving changes in species distribution and abundance over time.
To explore the role of local densities, climate, and landscape configuration in population regime shifts.

Main Methods:

Long-term (15-year) monitoring of 13 amphibian species in a metacommunity.
Analysis of local larval densities in occupied ponds and the extent of regional distribution.
Examination of population dynamics of a focal species (Pseudacris triseriata) exhibiting transitions in distribution and abundance.

Main Results:

A positive relationship was observed between mean larval density and the number of occupied ponds, which decelerated when considering habitat availability.
More abundant species occupied most available habitats, while rarer species appeared dispersal-limited.
Transitions between rare and common, widespread distributions were linked to changes in local densities driven by climate-affected habitat quality.
Threshold densities for population regime shifts varied with landscape configuration.

Conclusions:

Distribution-abundance patterns are shaped by cross-scale interactions between local (niche, resource) and metapopulation processes.
Climate-driven changes in local densities can trigger significant population regime shifts, impacting species distribution.
Understanding these mechanisms and thresholds is vital for conservation in fragmented landscapes.