A factor limiting recovery from bleaching in corals

October 02, 2020

Increases in seawater temperature can cause coral bleaching through the loss of symbiotic algae. Corals can recover from bleaching by recruiting algae into host cells from the residual symbiont population or from the external environment. However, the high coral mortality that often follows mass-bleaching events suggests that recovery is limited in the wild.

A joint research team from the National Institute for Basic Biology (NIBB), Tohoku University in Japan, and James Cook University in Australia has examined the effect of pre-exposure to heat stress on the capacity of symbiotic algae to infect cnidarian hosts using the Aiptasia (sea-anemone)-zooxanthellae (algae) model system. They discovered that the symbiotic algae lose their capacity to infect the host once they are exposed to heat stress. These results suggest that recovery from bleaching can be limited by the loss of symbiont infectivity following bleaching-inducing heat stress.

Coral reefs are the cornerstone of biologically enriched coral reef ecosystems, but their existence is in danger due to global change and warming. Coral-algae symbiosis is sensitive to increased seawater temperature, resulting in coral bleaching through loss of the algal symbionts, zooxanthellae. Corals can recover from bleaching by recruiting algae into their cells from the residual symbiont population or from the external environment. However, in the field, recovery from bleaching is often limited, resulting in mortality of corals due to starvation.

In a study published in The ISME Journal, graduate student of the National Institute for Basic Biology, Mariko Kishimoto, focused on the ability of symbiotic algae to infect the host following to heat stress and identified a factor limiting recovery from bleaching.

"In this study, we used Aiptasia (sea-anemone), instead of corals, as Aiptasia are very easy to maintain and use for experiments in the laboratory. And importantly, Aiptasia form the symbiotic relationship with the symbiotic algae, zooxanthellae, and also show bleaching under heat stress like corals do." Ms. Kishimoto said.

Symbiotic algae (CS-164) were cultured at 25 ºC or 32 ºC for 3 days and then their infectivity was tested at 25 ºC by counting the number of symbiotic algae in Aiptasia tentacles.

"The infectivity of algae was apparently lost after culturing at 32 ºC."

"Importantly, culturing Aiptasia, instead of algae, at 32 ºC did not influence infectivity."

"So our results showed that recovery from bleaching can be limited by the loss of symbiont infectivity following bleaching-inducing heat stress.", Ms. Kishimoto said.

Further study showed incubation at 32 ºC was non-lethal for the symbiotic algae which showed recovery of the loss of infectivity after culturing at optimal growth conditions.

The team also found that a different algal strain (CCMP2459) did not lose their infectivity after exposure to heat stress.

Associate Professor Shunichi Takahashi of the National Institute for Basic Biology, who led the research team, said, "Our findings suggest that heat tolerant algal symbionts might give a chance for bleached corals to recover".
-end-
The ISME Journal
"Loss of symbiont infectivity following thermal stress can be a factor limiting recovery from bleaching in cnidarians" by Mariko Kishimoto, Andrew H. Baird, Shinichiro Maruyama, Jun Minagawa, Shunichi Takahashi
DOI: https://doi.org/10.1038/s41396-020-00742-8

National Institutes of Natural Sciences

Related Algae Articles from Brightsurf:

Sprat, mollusks and algae: What a diet of the future might look like
Rethinking what we eat is essential if we hope to nourish ourselves sustainably and mind the climate.

Ocean algae get 'coup de grace' from viruses
Scientists have long believed that ocean viruses always quickly kill algae, but Rutgers-led research shows they live in harmony with algae and viruses provide a 'coup de grace' only when blooms of algae are already stressed and dying.

New science behind algae-based flip-flops
Sustainable flip-flops: A team of UC San Diego researchers has formulated polyurethane foams made from algae oil to meet commercial specifications for midsole shoes and the foot-bed of flip-flops.

Battling harmful algae blooms
In two separate studies, the University of Delaware's Kathryn Coyne is looking at why one species of algae has some strains that can cause fish kills and others that are non-toxic, while examining an algicidal bacterium found in Delaware's Inland Bays that could provide an environmentally-friendly approach to combatting algae blooms.

Algae as living biocatalysts for a green industry
Many substances that we use every day only work in the right 3D structure.

Algae in the oceans often steal genes from bacteria
Algae in the oceans often steal genes from bacteria to gain beneficial attributes, such as the ability to tolerate stressful environments or break down carbohydrates for food, according to a Rutgers co-authored study.

Algae team rosters could help ID 'super corals'
U.S. and Australian researchers have found a potential tool for identifying stress-tolerant ''super corals.'' In experiments that simulated climate change stress, researchers found corals that best survived had symbiotic algae communities with similar features.

Algae shown to improve gastrointestinal health
A green, single-celled organism called Chlamydomonas reinhardtii has served as a model species for topics spanning algae-based biofuels to plant evolution.

How do corals make the most of their symbiotic algae?
Corals depend on their symbiotic relationships with the algae that they host.

Algae as a resource: Chemical tricks from the sea
The chemical process by which bacteria break down algae into an energy source for the marine food chain, has been unknown - until now.

Read More: Algae News and Algae Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.