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Tag: "bleaching" at biology news

UCLA researchers identify key enzyme linked to childhood blindness

...ion is the first step in visual perception. Photo bleaching leaves the rhodopsin insensitive to light until the all trans retinaldehyde is converted, or "isomerized," back into 11 cis retinaldehyde, which completes the visual cycle. Scientists have for two decades been attempting to identify the retinoid isom...

Hidden sponges determine coral reef's nutrient cycle

... on subjects such as physical damage to reefs, the bleaching of coral and coral diseases. Sander Scheffers investigated a lesser-studied subject: the nutrient cycle on the coral reef and the role that organisms living in cavities, such as sponges, play in this. Underwater camera To determine the nature an...

Health of coral reefs detected from orbit

...have found Envisat's MERIS sensor can detect coral bleaching down to ten metres deep. This means Envisat could ...al reefs worldwide on a twice-weekly basis. Coral bleaching happens when symbiotic algae living in symbiosis with living coral polyps (and providing them their ...

Tiny polyps gorge themselves to survive coral bleaching

... the past decade, reports have multiplied of major bleaching events that have damaged, if not destroyed, large ...t range, even by only two degrees, the result is a bleaching event. Within a two-year window during the 1997-98 El Nino event, 16 percent of the world's coral re...

How marine reserves are giving coral reefs a helping hand

...recover from the devastating effects of an El Nino bleaching event in 1998 which caused widespread damage to coral around the world. What we have found is that marine reserves might provide exactly the right conditions to allow this to happen. Interestingly, once parrotfish reach a length of around 28 cm, th...

Ocean acidification threatens cold-water coral ecosystems

...ve-average seawater temperatures have caused coral bleaching events throughout the world, and the calcification rates of corals exposed to more acidic conditions in laboratory experiments have shown worrisome declines," says Guinotte. "But now we suspect that this increase in CO2 will have a detrimental effe...

Healthy coral reefs of Madagascar resisting damage from climate change

... They found healthy coral reefs that have avoided bleaching attributed to climate change found in other Indian Ocean reefs. The researchers believe cool water currents from adjacent deep ocean areas offset the warming effects of climate change. "The resiliency and health of the coral reefs with their biodive...

Global warming may have damaged coral reefs forever

...elles islands for seven years after the 1998 coral bleaching event. "Reefs can sometimes recover after disturbances, but we have shown that after severe bleaching events, collapse in the physical structure of the reef results in profound impacts on other organism...

Researchers appeal for new regulations to save coral reefs from live fish trade

...omplex array of threats including pollution, coral bleaching triggered by rising sea temperatures and over-fishing. In particular, the health of the reefs is being compromised by the live reef fish trade, a serious threat that has prompted scientists to call for tighter regulations on the exploitation of re...

Report warns about carbon dioxide threats to marine life

...me that they are being hit by warming-induced mass bleaching events," Langdon says. Mass bleaching occurs when unusually warm temperatures cause the coral to expel the colorful microscopic algae that...

Developing uses for sugar-cane bagasse: Biotechnology applied to the paper industry

...ne plant, widespread cultivation, lower energy and bleaching chemical requirements for bagasse refining. Such a...o undergo processing stages of delignification and bleaching to turn it into high-strength and durable paper. In some countries the chemical processing involved ...

Ocean sampling yields environmental sources of coral symbionts

...tant in the recovery of reef-building corals after bleaching events. ...

NASA satellite data helps assess the health of Florida's coral reef

... the number and species of coral and the extent of bleaching -- corals turn white when tiny algae that live ins...ssors than in the past. This is a major concern as bleaching events are becoming more common and severe," said Moses. "The Florida reef tract is considered by so...

Palau's coral reefs show differential habitat recovery following the 1998 bleaching event

... during three different periods following the 1998 bleaching ?in late 2001/early 2002, late 2002/early 2003, and late 2004/early 2005. Global climate models suggest that Micronesia is particularly vulnerable to climate change over the next millennia, and will be likely subjected to repeated thermal stress even...

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