Predator-prey interactions and changing environments: who benefits?

Area of Science:

• Ecology
• Environmental Science
• Aquatic Biology

Background:

• Aquatic environments experience dramatic fluctuations in key parameters like temperature, dissolved oxygen, and turbidity.
• Unlike terrestrial systems, aquatic environments lack thermal microenvironments due to water's high thermal conductivity, limiting prey's ability to escape temperature changes.
• Ectothermic organisms in temperate aquatic ecosystems, including fish and invertebrates, face significant energetic demands influenced by environmental temperature.

Purpose of the Study:

• To investigate the impact of temperature fluctuations on predator-prey interactions in temperate aquatic ecosystems.
• To explore the theoretical implications of changing thermal environments on aquatic predator-prey dynamics.
• To determine whether thermal changes pose a greater threat to predators or prey.

Main Methods:

• Focus on theoretical work due to limited experimental data on temperature's role in aquatic predator-prey interactions.
• Analysis of how environmental temperature affects the energetic demands of ectothermic aquatic organisms.
• Examination of the physical properties of water and their influence on thermal microhabitats.

Main Results:

• Environmental temperature significantly affects the energetic demands of ectothermic aquatic predators and prey.
• The lack of thermal microhabitats in lentic environments restricts fine-scale habitat movements for temperature regulation.
• Theoretical analysis suggests that thermal changes may present a greater threat to predators than to prey.

Conclusions:

• Changes in aquatic thermal environments can have complex and non-intuitive effects on predator-prey interactions.
• Cold-adapted species may experience a net benefit from predator-prey interactions under altered thermal conditions.
• Further experimental research is needed to fully understand the ecological consequences of rising temperatures in aquatic ecosystems.