Experimental Evidence for the Desynchronization of Ecosystem Dynamics by Global Change

Area of Science:

• Ecology
• Environmental Science
• Global Change Biology

Background:

• Predicting ecosystem responses to global change necessitates understanding environmental disturbance effects across space and time.
• Coordinated ecosystem responses offer a powerful approach to studying these impacts.
• Dissolved oxygen saturation is an integrative parameter for assessing ecosystem metabolic balance.

Purpose of the Study:

• To determine if warming, nutrient enrichment, and predator overexploitation, individually and combined, drive coordinated responses in freshwater ecosystems.
• To evaluate the dynamics of synchrony between control and disturbed mesocosms.

Main Methods:

• Conducted two complementary mesocosm experiments.
• Utilized high-frequency dissolved oxygen saturation measurements to assess ecosystem metabolic balance and synchrony.
• Compared oxygen dynamics between control and disturbed treatments.

Main Results:

• Nutrient enrichment desynchronized oxygen dynamics, likely due to increased primary production.
• Warming and predator overexploitation tended to desynchronize oxygen cycles, especially at shorter time scales.
• Combined warming and nutrient enrichment dampened desynchronization, while predator overexploitation enhanced it.

Conclusions:

• This study provides experimental evidence of global change impacts on ecosystem synchrony.
• Altered ecosystem functioning across spatial and temporal scales can be detected by examining synchrony.
• Further research into ecosystem synchrony is needed to understand global change effects.