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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

Limits on ecosystem trophic complexity: insights from ecological network analysis.

Robert E Ulanowicz¹, Robert D Holt, Michael Barfield

¹Department of Biology, University of Florida, Gainesville, FL, 32611, USA; Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD, 20688, USA.

Ecology Letters

|January 3, 2014

Summary

This summary is machine-generated.

Ecological food chains have a limited length, typically around 3-4 trophic links. This is because most food webs have few strong energy flows, despite many weak connections.

Keywords:

Connectivity ecosystem roles food chain length network complexity system flexibility system roles trophic breadth trophic depth window of vitality

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Area of Science:

Ecology
Food Web Dynamics
Network Theory

Background:

Determining the length of trophic food chains is a persistent ecological challenge.
Traditional methods of counting species and energy transfers are insufficient due to the wide variation in transfer magnitudes.

Purpose of the Study:

To develop new quantitative measures for analyzing ecological networks with varying transfer magnitudes.
To re-evaluate the complexity of ecosystem food webs using these advanced metrics.

Main Methods:

Created a suite of extended measures to quantify trophic networks with orders-of-magnitude variations.
Applied these measures to empirical data from ecosystem trophic networks.

Main Results:

Ecosystem food webs are less complex than typically assumed, dominated by a few strong energy flows.
Despite large numbers of nodes and transfers, networks function like simpler systems (e.g., <14 nodes).
Effective trophic chain length is bounded at approximately 3-4 links.

Conclusions:

The complexity of ecological food webs is constrained by the dominance of strong energy flows.
A consistent upper limit of 3-4 trophic levels appears to be a general property of ecosystems.
Whole-system processes likely drive these observed ecological limits and regularities.