Functional groups of forest succession as dissipative structures: an applied study

Area of Science:

• Ecology
• Plant Physiology
• Forest Dynamics

Background:

• Forest succession involves species colonizing diverse environments.
• Pioneer species often dominate early stages in forest gaps.
• Understanding species' physiological traits is crucial for ecological success.

Purpose of the Study:

• To test if dissipative efficiency provides an ecological advantage for tropical tree species during forest succession.
• To compare the gas exchange and metabolic network responses of pioneer and late successional species to water deficit.
• To evaluate leaf temperature regulation as a measure of dissipative structure efficiency.

Main Methods:

• Assessed daily leaf gas exchange for pioneer (Guazuma ulmifolia) and late successional (Cariniana legalis) species.
• Applied well-irrigated and water deficit conditions.
• Analyzed metabolic network parameters (connectance and autonomy) and leaf temperature changes (deltaT).

Main Results:

• Water deficit altered physiological and systemic parameters in both species.
• Pioneer species exhibited higher photosynthetic rates, linked to efficient energy dissipation.
• Leaf temperature regulation (deltaT) effectively indicated dissipative structure efficiency.

Conclusions:

• The dominance of pioneer species in early forest succession may stem from higher photosynthetic efficiency, supported by robust dissipative structures.
• Late successional species are not necessarily incapable of colonizing gaps.
• Leaf temperature change (deltaT) analysis is a valuable tool for assessing plant functional groups and their dissipative capacities.