Abstract


THE IMPORTANCE OF STRESSOR INTERACTIONS ON MACROALGAE IN URBAN ENVIRONMENTS WITH COMPLEX REGIMES OF MULTIPLE DISTURBANCES

Globally, ecosystems increasingly experience disturbance regime encompassing multiple stressors, where natural fluxes are amplified by human activities. In the urbanised, eutrophic environment of Singapore, bivariate smoothed models (GAMs) demonstrated that temperature and phosphate operate interactively, resulting in seasonal modulation of nutrient impacts on reef macroalgae. Although algae seasonal patterns were maintained, there was a noticeable reduction of persistent, opportunistic algae groups and reorganisation of dominant groups. Source of acute and chronic stresses in the system were identified and a generality in the patterns of the response of algae functional groups to these stressors was found. Both synergistic and antagonistic interactive effects were observed in species responses to the variation in the physico-chemical regime. Antagonistic interactions can mitigate deleterious effects of single stressors, conversely synergistic interactions can exacerbate single stressor effects in a non-additive manner. Understanding how these interactions operate enables a departure from the dogmatic categorisation of environmental parameters. This allows for better decision making, prioritisation in the development of ecological thresholds and setting of trigger values for management intervention.

Authors

Baula, I. U., Tropical Marine Science Institute, Singapore, tmsiub@nus.edu.sg

Lee, A. C., Tropical Marine Science Institute, Singapore, tmsleeac@nus.edu.sg

Sin, T. M., Tropical Marine Science Institute, Singapore, tmssintn@nus.edu.sg

Details

Oral presentation

Session #:36
Date: 06/23/2016
Time: 15:00
Location: 306 A/B

Presentation is given by student: No