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Related Experiment Video

Updated: Feb 24, 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

Ecosystem size predicts eco-morphological variability in a postglacial diversification.

Hans Recknagel¹, Oliver E Hooker^1,2, Colin E Adams¹

¹Institute of Biodiversity Animal Health & Comparative Medicine College of Medical, Veterinary & Life Sciences University of Glasgow Glasgow UK.

Ecology and Evolution

|August 17, 2017

Summary

This summary is machine-generated.

Environmental factors drive rapid adaptive evolution in Arctic charr. Larger, deeper lakes with less littoral zone promote the evolution of distinct head shapes in these fish.

Keywords:

Arctic charr adaptive morphology benthic–limnetic ecological opportunity environmental heterogeneity freshwater fish trophic morphology

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Area of Science:

Evolutionary biology
Ecology
Ichthyology

Background:

Adaptive radiations offer insights into speciation and diversification.
Arctic charr (Salvelinus alpinus) exhibit rapid, parallel evolution in postglacial lakes.
Morphological variation is linked to foraging ecology and environmental pressures.

Purpose of the Study:

To investigate the abiotic and biotic factors influencing adaptive morphological variation in Arctic charr.
To understand the role of lake characteristics in shaping fish evolution.
To identify environmental drivers of eco-morphological diversification.

Main Methods:

Studied 1,091 Arctic charr individuals across 30 lake populations.
Measured head depth as an indicator of eco-morphology and foraging.
Correlated morphological data with lake bathymetry and ecological parameters.

Main Results:

Arctic charr head depth varied significantly with abiotic factors: positively with ecosystem size (volume, surface area, depth) and negatively with littoral zone.
Robust-headed phenotypes were associated with larger, deeper lakes.
No influence of biotic community on trophic morphology was detected.

Conclusions:

Extrinsic environmental factors, particularly lake size and depth, facilitate rapid eco-morphological diversification in Arctic charr.
Abiotic conditions play a crucial role in shaping adaptive variation during recent radiations.
The study highlights the importance of environmental context in evolutionary processes.