Navigation Links
Rethinking the reef
Date:7/3/2014

A new study by biologists at San Diego State University and Scripps Institution of Oceanography shows that inhabited coral islands that engage in commercial fishing dramatically alter their nearby reef ecosystems, disturbing the microbes, corals, algae and fish that call the reef home.

The study's lead author, Linda Wegley Kelly, is a postdoctoral scholar in the lab of SDSU virologist Forest Rohwer.

For the study, she looked at seawater samples collected from the surfaces of reefs surrounding all 11 of the Line Islands, a chain of atolls in the central Pacific Ocean. Over the past five years, Kelly and her colleagues have made sporadic trips to the islands, collecting the samples with a specially adapted bilge pump that sucks up approximately 100 liters of water in a given area.

Kelly sequenced the microbiomes of the samples to determine the DNA encoded by the viruses, bacteria, archaea (tiny, single-celled microorganisms like Halobacteria), and protists (similarly tiny eukaryotic microorganisms such as diatoms) all living in the same space. Within these millions of DNA sequences, Kelly found that certain types of bacteria predicted whether the reef was predominantly composed up of coral or algae.

Algae or coral?

The preponderance of either of these organisms has huge ramifications for the health of the surrounding sea.

"Corals are fierce competitors for space on the reef," Kelly said. "In a healthy marine environment, reefs support a vibrant population of corals and other calcifying organisms that continuously build the reef skyward."

If reefs are dominated by algae, however, the entire habitat dissolves over time and the fish don't have anywhere to go, Kelly explained.

When she sequenced the surfaces of algae-covered reefs, Kelly identified microbes that may contribute to an ecological feedback loop which impairs coral growth. Her study was published this week in the Proceedings of the National Academy of Sciences.

Population centers

Another observation, that the reef microbiomes on unpopulated islands were more similar to one another than to other geographically closer but populated islands, suggests that the entire community of reef inhabitants, including the microbes, is more significantly influenced by the degree of the reef's coral or algal cover than researchers previously realized.

Her results have implications for conservationists looking for ways to improve strategies for managing coral reef ecosystems.

"How do you create an environment for corals to thrive?" Kelly asked. "In addition to practicing sustainable fishing, one way to rehabilitate a reef would be to transplant corals to the site. This should promote an environment more conducive to coral growth by fostering a beneficial community of microorganisms."


'/>"/>

Contact: Natalia Elko
natalia.elko@mail.sdsu.edu
619-594-2585
San Diego State University
Source:Eurekalert  

Related biology news :

1. Researchers call for rethinking efforts to prevent interplanetary contamination
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Rethinking the reef
(Date:3/23/2016)... WAKEFIELD, Massachusetts , March 23, 2016 ... kombiniert im Interesse erhöhter Sicherheit Gesichts- und ... Xura, Inc. (NASDAQ: MESG ... heute bekannt, dass das Unternehmen mit SpeechPro ... insbesondere aus der Finanzdienstleistungsbranche, wird die Möglichkeit ...
(Date:3/18/2016)... -- --> --> Competitive ... Unmanned Vehicles, Physical infrastructure and Perimeter Surveillance & Detection Systems ... security market and the continuing migration crisis in the ... has led visiongain to publish this unique report, which ... defence & security companies in the border security market ...
(Date:3/14/2016)... NXTD ) ("NXT-ID" or the "Company"), ... the airing of a new series of commercials on Time ... 21 st .  The commercials will air on Bloomberg TV, ... the Street show. --> NXTD ) ("NXT-ID" or ... market, announces the airing of a new series of commercials ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... ... 28, 2016 , ... As part of an ongoing global ... expanding its LATAM network and logistics capabilities. Enhancements have been made to ... trial projects. , The expansion will provide unmatched clinical trial logistics services for ...
(Date:4/27/2016)... (PRWEB) , ... April 27, 2016 , ... Cambridge ... by semantic web technology, today announced that it has been named to The Silicon ... sciences, financial services and other markets, Cambridge Semantics serves the needs of end users ...
(Date:4/27/2016)... ... April 27, 2016 , ... The Pittcon Organizing Committee is pleased ... has been a volunteer member of Committee since 1987. Since then, he has served ... and treasurer and was chairman for both the program and exposition committees. In his ...
(Date:4/27/2016)... , April 27, 2016 ... NSK) (OTCPink: NSKQB) ( Frankfurt : ... ihre Pressemitteilung vom 13. August 2015 die Genehmigung ... Finanzen um zusätzliche 200.000.000 Einheiten auf 400.000.000 Einheiten ... zu bringen. Davon wurden 157.900.000 Einheiten mit dem ...
Breaking Biology Technology: