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Crossing habitat boundaries: coupling dynamics of ecosystems through complex life cycles

Crossing habitat boundaries: coupling dynamics of ecosystems through complex life cycles Ecosystems are often indirectly connected through consumers with complex life cycles (CLC), in which different life stages inhabit different ecosystems. Using a structured consumer resource model that accounts for the independent effects of two resources on consumer growth and reproductive rates, we show that such indirect connections between ecosystems can result in alternative stable states characterized by adult‐dominated and juvenile‐dominated consumer populations. As a consequence, gradual changes in ecosystem productivity or mortality rates of the consumer can lead to dramatic and abrupt regime shifts across different ecosystems, hysteresis and counterintuitive changes in the consumer abundances. Whether these counter intuitive or abrupt responses occur depend on the relative productivity of both habitats and which consumer life‐stage inhabits the manipulated ecosystem. These results demonstrate the strong yet complex interactions between ecosystems coupled through consumers with CLC and the need to think across ecosystems to reliably predict the consequences of natural or anthropogenic changes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecology Letters Wiley

Crossing habitat boundaries: coupling dynamics of ecosystems through complex life cycles

Ecology Letters , Volume 11 (6) – Jun 1, 2008

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References (49)

Publisher
Wiley
Copyright
© 2008 Blackwell Publishing Ltd/CNRS
ISSN
1461-023X
eISSN
1461-0248
DOI
10.1111/j.1461-0248.2008.01171.x
pmid
18371091
Publisher site
See Article on Publisher Site

Abstract

Ecosystems are often indirectly connected through consumers with complex life cycles (CLC), in which different life stages inhabit different ecosystems. Using a structured consumer resource model that accounts for the independent effects of two resources on consumer growth and reproductive rates, we show that such indirect connections between ecosystems can result in alternative stable states characterized by adult‐dominated and juvenile‐dominated consumer populations. As a consequence, gradual changes in ecosystem productivity or mortality rates of the consumer can lead to dramatic and abrupt regime shifts across different ecosystems, hysteresis and counterintuitive changes in the consumer abundances. Whether these counter intuitive or abrupt responses occur depend on the relative productivity of both habitats and which consumer life‐stage inhabits the manipulated ecosystem. These results demonstrate the strong yet complex interactions between ecosystems coupled through consumers with CLC and the need to think across ecosystems to reliably predict the consequences of natural or anthropogenic changes.

Journal

Ecology LettersWiley

Published: Jun 1, 2008

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