Title:

FRDC-DCCEE: adapting to the effects of climate change on Australia’s deep marine reserves

Project Number:

2010-510

Organisation:

CSIRO Land and Water Canberra

Principal Investigator:

Ronald Thresher

Project Status:

Completed

FRDC Expenditure:

$89,326.72

Program(s):

Environment

Need

Australia’s highly endemic deep-water coral communities are under a current and accelerating threat of being squeezed out of existence, between seamount summits typically deeper than 1000 m. and carbonate levels that are falling and pushing the saturation horizon towards the surface. This horizon, below which the reef-forming corals apparently cannot grow (Guinotte et al., Front. Ecol. Env. Sci., 2006), has already shoaled by 50-130 m in the last 200 years due to industrial CO2 emissions (Thresher, et al., ms). Under-saturated water is likely already encroaching on the reef, which recent surveys found is just below the current saturation horizon (Thresher, et al., ms), and not above it, as expected. There is real risk that the reef is already stressed and may even be dying. The problem will only get worse. Under a “business-as-usual” scenario, even the tops of the seamounts will be under-saturated in the next 50-100 years. With nowhere to go, Australia’s cold-water reefs could “simply disappear” (Poloczanka, el al., Ann. Rev. Oceanog. Mar. Biol., 2007). There are presently no adaptation strategies for dealing with this threat, nor even any research on strategies, even though it challenges the key objectives of the SE Commonwealth Marine Reserve Network, and the survival of deep-sea reefs globally. This project, developed in consultation with DEWHA, will evaluate the magnitude of the threat to Australia’s key reef-forming species, and identify and test management options for adapting to it. It addresses NARP priorities for determining ecosystem vulnerability and the feasibility of intervention and adaptation strategies.

Objectives

1. 1. To develop practical options for DEWHA to manage the impacts of climate change on the South-east Commonwealth Marine Reserve

2. 2. To develop a generic model that can be applied to forecasting the impacts of climate change on other deep sea biota

Final Report - 2010-510-DLD - FRDC-DCCEE: adapting to the effects of climate change on Australia’s deep marine reserves

Final Report
ISBN:978-­0-643-‐10949­‐0
ISSN:
Author(s):
Date Published:September 2012
Principal Investigator: Dr R. E. Thresher

Keywords: Climate change, Coldwater coral reefs, Ocean acidification, Deep-‐sea fisheries, Seamounts, SE Commonwealth Marine Reserve.

 
Summary:
OUTCOMES ACHIEVED TO DATE
To date, this project has 
(1) determined that climate change in general, and ocean acidification in particular, is likely to result in the loss over the next  century of the  cold-­‐water coral reefs that characterize seamounts in the SE Commonwealth Marine Reserve 
(2) identified possible refugia habitats along the continental shelf of southern Australia
(3) identified possible adaptation strategies that involve assisted translocation of the reefs and the use of artificial substrates to provide suitable hard ground for coral growth
(4) raised the need with key stakeholders for workshop to assess the feasibility of these strategies and to consider other  options for maintaining the viability of these deepwater ecosystems