قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Dying coral reefs become vibrant neon colors in the bright last attempt to survive

Dying coral reefs become vibrant neon colors in the bright last attempt to survive



For years, coral reef the whole world is broken by mass bleaching events as the oceans continue to warm up due to climate change. Corals stand little chance of bouncing back from these events – but a new study suggests they have an unusual way of survival: getting a vibrant neon color.

When bleaching occurs, extended heat spikes cause corals to become white, often leading to their demise. But “colorful bleaching” has the opposite effect: dying corals get more pigments, and glow in shades of bright pink, purple and orange.

Scientists first discovered the mysterious neon coral a decade ago, but they do not know why it happened. This study, published Thursday in the journal Current Biology, suggests that corals will change color as a last ditch effort live.

Richard Vevers / The Ocean Agency / XL Catlin Seaview Survey
Colorful bleaching of Acropora corals in New Caledonia.

Richard Vever / The Ocean Agency / XL Catlin


Coral animals are symbolically grouped together with small algae, giving them habitat, nutrients and carbon dioxide in exchange for their photosynthetic powers. Even slightly increasing at yearly ocean temperatures could jeopardize this relationship, expelling algae from coral tissue and exposing its white outline. After the coral is exposed, it often breaks down and dies, changing the ecosystem for the different lifestyles it relies on.

Researchers at the University of Southampton’s Coral Reef Laboratory studied 15 vibrant bleaching events around the world between 2010 and 2019 – including one on the Great Barrier Reef, the world’s largest coral reef system – and inhaled ocean temperatures in a lab. They found that colorful bleaching events occur when corals produce “what is effective as a layer of sunscreen” on their surface to protect against harmful rays and create a glowing belief believed by the Researchers who encourage algae to return.

The Ocean Agency described the process as a “chilling, beautiful and heart-warming” final shout for help as the fences attempted to capture the algae’s attention.

“Our research shows that vibrant bleaching involves a mechanism of self-regulate, a so-called optical feedback loop, that involves both partners of symbiosis,” lead researcher Professor Jörg Wiedenmann of the University of Southampton said. said in a press release. “The resulting layer of sunscreen will subsequently promote the return of the symbols. As the recovering algal population begins to obtain light for their photosynthesis, the levels of light within the coral will decrease and coral cells lower the production of colorful pigments to their normal levels. “

20-26-acropora-corals-color-bleaching-phillipines-2010-credit-ryan-goehrung-university-of-washington-web-jpg-sia.jpg
Colorful firing Acropora corals in the Phillipines.

Ryan Goehrung, University of Washington


Coral reefs support more species per unit area than other marine environments, including about 4,000 fish species, 800 species of hard corals and potentially millions of other undiscovered species species, according to the National Oceanic and Atmospheric Administration. Disruptions in coral reefs have a significant impact on ocean ecosystems.

It is not just warming the oceans that causes colorful bleaching. Researchers say changes in the level of nutrition within coral reefs due to runaway policies from farms have also led to bleaching events – a problem that can be fixed at the local level.

Experts only believe in fences that face mild or short-term, rather than intense mass bleaching events, you can try to save yourself using this process. These corals may still undergo some of their normal functions for a short time as they expect algae to return – while severe changes in ocean temperatures almost always lead to coral deaths.

Reports of colorful bleaching during the latest bleaching event on the Great Barrier Reef in March and April have given scientists hope that system patches have a chance to recover.

“Bleeding is not always a death sentence for corals, coral animals can still be alive,” Dr. Cecilia D’Angelo, a lectular coral biology lecturer at the University of Southampton. “If the fatigue event is mild enough, corals can re-establish symbiosis with their algal partner.”

file-20200520-152284-1bobeo1.jpg
Internal changes that allow for colorful bleaching to occur.

Jörg Wiedenmann, Elena Bollati & Cecilia D’Angelo / University of Southampton, Palawan colorful bleach by Ryan Goehrung / University of Washington


Bleeding events have been few and far between, but they occur almost every year. In 2017 alone, nearly half of the corals on the Great Barrier Reef died – and experts say we are running out of time to save them.

“Unfortunately, recent stages of global firing caused by unusual hot water have resulted in high coral mortality, leaving the world’s coral reefs struggling to survive,” D’Angelo said. .

Scientists emphasize that while vibrant bleaching is a good sign, only a significant reduction of greenhouse gases worldwide – in addition to improving local water quality – can save coral reefs beyond the century this.

“Now that we know that nutritional levels can affect colorful bleaching too, we can more easily identify cases where heat stress can be aggravated by poor water quality,” say the researchers. “It can be managed locally, while ocean heat waves caused by climate change need global leadership. Together, these actions could save a future for coral reefs.”


Source link