Journal Article

Organismal homeostasis buffers the effects of abiotic change on community dynamics

Ghedini, Giulia, Connell, Sean D.

2016

Overview

The problem of linking fine-scale processes to broad-scale patterns remains a central challenge of ecology. As rates of abiotic change intensify, there is a critical need to understand how individual responses aggregate to generate compensatory dynamics that stabilize community processes. Notably, while local and global resource enhancement (e.g., nutrient and CO₂ release) can reverse dominance relationship between key species (e.g., shifts from naturally kelp-dominated to turf-dominated systems), herbivores can counter these shifts by consuming the additional productivity of competing species (e.g., turfs). Here, we test whether consumer plasticity in energy intake to maintain growth in varying environments can underpin changes in consumption that buffer varying levels of productivity. In response to carbon and nutrient enrichment, herbivores increased consumption of higher-quality food, which acted as a buffer against enhanced production, while maintaining organismal processes across varying abiotic conditions (i.e., growth). These results not only suggest plasticity in feeding behavior, but also in energy acquisition and utilization to maintain organismal processes. Such plasticity may not only underpin organismal homeostasis, but also compensatory dynamics that emerge from the aggregate of these responses to buffer change in community processes.

• Publisher: Wiley Subscription Services, Inc,Ecological Society of America
• Subject: abiotic change / Abiotic stress / Carbon / Carbon dioxide / compensation / Ecosystem / energy intake / Feeding behavior / Herbivores / Herbivory / Homeostasis / Kelp / Nutrient release / Plasticity / resistance / stability / trophic interactions / Turf