Featured Research

from universities, journals, and other organizations

Coral Reefs Face Increasing Difficulties Recovering From Storm Damage

Date:
August 4, 2009
Source:
ARC Centre of Excellence in Coral Reef Studies
Summary:
As global warming whips up more powerful and frequent hurricanes and storms, the world's coral reefs face increased disruption to their ability to breed and recover from damage. "We have found clear evidence that coral recruitment -- the regrowth of young corals -- drops sharply in the wake of a major bleaching event or a hurricane," says the lead author of the study.

As global warming whips up more powerful and frequent hurricanes and storms, the world’s coral reefs face increased disruption to their ability to breed and recover from damage.

That’s one of the findings from a new scientific study of the fate of corals in the wake of large climate-driven bleaching and storm events.

“We have found clear evidence that coral recruitment – the regrowth of young corals – drops sharply in the wake of a major bleaching event or a hurricane,” says lead author Dr Jennie Mallela of the ARC Centre of Excellence for Coral Reef Studies and Australian National University.

Using the island of Tobago in the Caribbean as their laboratory she and colleague Professor  James Crabbe of the University of Bedfordshire, UK, backtracked to 1980 to see what had happened to the corals in the wake of nine hurricanes, tropical storms and bleaching events.

“In every case there was a sharp drop in coral recruitment following the event – often by as much as two thirds to three quarters. Not only were fewer new coral colonies formed, but also far fewer of the major reef building coral species recruited successfully.”

“This finding mirrors our modelling studies on the fringing reefs of Jamaica, and on the Meso-American Barrier reef off the coast of Belize”, says Prof. Crabbe.

Tobago lies outside the main Caribbean hurricane belt and therefore is more typical of the circumstances of most coral reefs around the world.  Nevertheless its corals are disrupted by a major storm or bleaching every three or four years – and the frequency of this may be growing.

“Climate researchers are seeing increasing evidence for a direct relationship between global warming and rising hurricane intensity as well as frequency,” Jennie explains. “Global warming produces significant increases in the frequency of high sea surface temperatures (SSTs), and hurricane winds are strengthened by warm surface waters.”

The high temperatures cause bleaching, while the storms inflict physical destruction on the corals as well as eroding the rocky platforms they need to grow on, or burying them in sand.

“Maintaining coral reef populations in the face of large-scale degradation depends critically on recruitment – the ability of the corals to breed successfully and settle on the reef to form new colonies. Our research suggests this process is severely disrupted after one of these major events.”

If the disruption is sufficiently large it may threaten the actual survival of some of the larger and more spectacular reef building and brain corals, she says. “In the aftermath of a big storm or bleaching event, some of these important species appear not to have recruited at all.

“Healthy reefs usually have high numbers of coral recruits and juvenile corals, whereas degraded systems typically have far fewer young colonies.”

The concern is that if major storms and bleaching become more frequent as the climate warms, the ability of individual reefs to renew themselves may break down completely, Jennie says.

“While our work was carried out in the Caribbean, it has general implications for coral reefs globally, and deepens our concern as to what may happen to them as global warming advances and the world’s climate becomes more tempestuous.”

The research paper is Mallela, J., Crabbe, M.J.C., Hurricanes and coral bleaching linked to changes in coral recruitment in Tobago, and is published in the latest issue of Marine Environmental Research (2009).


Story Source:

The above story is based on materials provided by ARC Centre of Excellence in Coral Reef Studies. Note: Materials may be edited for content and length.


Cite This Page:

ARC Centre of Excellence in Coral Reef Studies. "Coral Reefs Face Increasing Difficulties Recovering From Storm Damage." ScienceDaily. ScienceDaily, 4 August 2009. <www.sciencedaily.com/releases/2009/06/090623112119.htm>.
ARC Centre of Excellence in Coral Reef Studies. (2009, August 4). Coral Reefs Face Increasing Difficulties Recovering From Storm Damage. ScienceDaily. Retrieved September 3, 2014 from www.sciencedaily.com/releases/2009/06/090623112119.htm
ARC Centre of Excellence in Coral Reef Studies. "Coral Reefs Face Increasing Difficulties Recovering From Storm Damage." ScienceDaily. www.sciencedaily.com/releases/2009/06/090623112119.htm (accessed September 3, 2014).

Share This



More Earth & Climate News

Wednesday, September 3, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Thousands of Fish Dead in Mexico Lake

Raw: Thousands of Fish Dead in Mexico Lake

AP (Sep. 2, 2014) — Over 53 tons of rotting fish have been removed from Lake Cajititlan in western Jalisco state. Authorities say that the thousands of fish did not die of natural causes. (Sep. 2) Video provided by AP
Powered by NewsLook.com
Raw: Iceland Volcano Spewing Smoke

Raw: Iceland Volcano Spewing Smoke

AP (Sep. 2, 2014) — The alert warning for the area surrounding Iceland's Bardarbunga volcano was kept at orange on Tuesday, indicating increased unrest with greater potential for an eruption. Smoke is spewing from the volcano, and lava is spouting nearby. (Sept. 2) Video provided by AP
Powered by NewsLook.com
U.N. Says Ebola Travel Restrictions Will Cause Food Shortage

U.N. Says Ebola Travel Restrictions Will Cause Food Shortage

Newsy (Sep. 2, 2014) — The U.N. says the problem is two-fold — quarantine zones and travel restrictions are limiting the movement of both people and food. Video provided by Newsy
Powered by NewsLook.com
Halliburton Reaches $1B Gulf Spill Settlement

Halliburton Reaches $1B Gulf Spill Settlement

AP (Sep. 2, 2014) — Halliburton's agreement to pay more than $1 billion to settle numerous claims involving the 2010 BP oil spill could be a way to diminish years of costly litigation. A federal judge still has to approve the settlement. (Sept. 2) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins