People and ecosystems

Understanding of the links between coral reef ecosystems, the goods and services they provide to people, and the wellbeing of human societies.


Ecosystem dynamics: past, present and future

Examining the multi-scale dynamics of reefs, from population dynamics to macroevolution


Responding to a changing world

Advancing the fundamental understanding of the key processes underpinning reef resilience.

Coral Bleaching

Coral Bleaching

Coral Reef Studies

From 2005 to 2022, the main node of the ARC Centre of Excellence for Coral Reef Studies was headquartered at James Cook University in Townsville, Queensland (Australia)

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The effect of increasing temperature on algae-fish interactions on coral reefs


Wednesday, April 26th 12:00 to 13:00 hrs

Building 19, Room 106, JCU Townsville Campus
Alexia Graba-Landry
Alexia Graba-Landry

Abstract. Ocean warming is one of the greatest threats facing marine ecosystems. Increasing temperatures are impacting species-level performance, distributions and abundances which can then alter community composition, and trophic interactions. Herbivorous fishes play a pivotal role in structuring coral reef communities by regulating algal biomass. Understanding how the control of algal biomass by fishes may change with increasing temperature is a crucial, yet understudied aspect of how coral reefs will function in a warmer world. This project will assess the effects of increasing temperature on tropical algae-fish interactions, quantifying the thermal sensitivities between herbivore consumption and macroalgal productivity.

Biography. Alexia is a PhD student at the ARC Centre of Excellence for Coral Reef Studies at JCU. She recently moved to Townsville after living for 9 months on Lizard Island working as a camera assistant for the BBC. She is from Winnipeg, Manitoba, Canada, and completed her Bachelor of Science at the University of Winnipeg in 2010. She moved to Australia in 2011 to complete her Bachelor of Marine Science and Management with Honours at the National Marine Science Centre with Southern Cross University where she investigated the effects of climate change on seaweed physiology, defense, and seaweed-amphipod interactions. Upon completing honours, she took a year off and moved to Vancouver to work in public programming at the Vancouver Aquarium in 2012. In 2013, she made the leap across the Pacific once again for sun, sand, and science. She then worked for two years as a research assistant at the National Marine Science Centre assisting and conducting climate change and Crown-of-Thorns Starfish (COTS) research. She is currently investigating the effect of increasing temperature on marine plant-herbivore (seaweed-fish) interactions under the supervision of Dr. Andrew Hoey and Prof. Morgan Pratchett.


Australian Research Council Pandora

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