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2023–2025 Global Coral Bleaching Event
The 2023–2025 global coral bleaching event is an ongoing environmental disaster that represents the most extensive coral bleaching incident in recorded history, affecting approximately 84% of the Earth's coral reef ecosystems. Announced by the International Coral Reef Initiative (ICRI) in April 2025, the event was the fourth global bleaching event officially documented, and surpassed the previous 2014–17 event, which impacted roughly two-thirds of global reefs. Coral reefs in the territories of at least eighty-two nations suffered enough thermal stress to undergo bleaching. The ongoing event, which began in February 2023, has been primarily attributed to escalating ocean temperatures associated with anthropogenic climate change, with marine researchers stating that there was no clear indication of when it might conclude. Background Coral bleaching occurs when environmental stressors, particularly elevated ocean temperatures, disrupt the symbiotic relationship between c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coral Bleaching
Coral bleaching is the process when corals become white due to loss of Symbiosis, symbiotic algae and Photosynthesis, photosynthetic pigments. This loss of pigment can be caused by various stressors, such as changes in water temperature, light, salinity, or nutrients. A bleached coral is not necessarily dead, and some corals may survive. However, a bleached coral is under stress, more vulnerable to starvation and disease, and at risk of death. The leading cause of coral bleaching is Effects of climate change on oceans, rising ocean temperatures due to climate change. Bleaching occurs when coral polyp (zoology), polyps expel the zooxanthellae (dinoflagellates commonly referred to as algae) that live inside their tissue, causing the coral to turn white. The zooxanthellae are Photosynthesis, photosynthetic, and as the water temperature rises, they begin to produce reactive oxygen species. This is Toxicity, toxic to the coral, so the coral expels the zooxanthellae. Since the zooxant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toxicity
Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism. Toxicity can refer to the effect on a whole organism, such as an animal, bacteria, bacterium, or plant, as well as the effect on a substructure of the organism, such as a cell (biology), cell (cytotoxicity) or an organ such as the liver (hepatotoxicity). Sometimes the word is more or less synonymous with poison#Poisoning, poisoning in everyday usage. A central concept of toxicology is that the effects of a toxicant are Dose (biochemistry), dose-dependent; even water can lead to water intoxication when taken in too high a dose, whereas for even a very toxic substance such as snake venom there is a dose below which there is no detectable toxic effect. Toxicity is species-specific, making cross-species analysis problematic. Newer paradigms and metrics are evolving to bypass animal testing, while maintaining the concept of toxicity endpoints. Etymology In Ancient G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Climate
Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteorological variables that are commonly measured are temperature, humidity, atmospheric pressure, wind, and precipitation. In a broader sense, climate is the state of the components of the climate system, including the atmosphere, hydrosphere, cryosphere, lithosphere and biosphere and the interactions between them. The climate of a location is affected by its latitude, longitude, terrain, altitude, land use and nearby water bodies and their currents. Climates can be classified according to the average and typical variables, most commonly temperature and precipitation. The most widely used classification scheme is the Köppen climate classification. The Thornthwaite system, in use since 1948, incorporates evapotranspiration along ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Ecosystem
Marine ecosystems are the largest of Earth's aquatic ecosystems and exist in Saline water, waters that have a high salt content. These systems contrast with freshwater ecosystems, which have a lower salt content. Marine waters cover more than 70% of the surface of the Earth and account for more than 97% of Earth's water supply and 90% of habitable space on Earth. Seawater has an average salinity of 35 parts-per notation, parts per thousand of water. Actual salinity varies among different marine ecosystems. Marine ecosystems can be divided into many zones depending upon water depth and shoreline features. The oceanic zone is the vast open part of the ocean where animals such as whales, sharks, and tuna live. The benthic zone consists of substrates below water where many invertebrates live. The intertidal zone is the area between high and low tides. Other near-shore (neritic) zones can include mudflats, Seagrass, seagrass meadows, mangroves, rocky Intertidal zone, intertidal s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Coral Reef Society
The International Coral Reef Society (ICRS; previously the International Society for Reef Studies) is an international, not-for profit, scientific society dedicated to the conservation of coral reefs through science and understanding. Founded in 1980, the primary objective of ICRS is the improvement of scientific knowledge and understanding of coral reefs, both living and fossil. Activities To achieve its objectives the ICRS prints and distributes the journal ''Coral Reefs'' as well as a Society newsletter, ''Reef Encounter''. The ICRS also holds annual meetings and co-sponsors other gatherings, symposia and conferences relating to coral reefs. Symposium ICRS helps organize the International Coral Reef Symposium (ICRS). The most recent symposium was held in 2022, in Bremen. The symposium has previously been held in Honolulu (2016), Cairns, Queensland, Australia (2012); Fort Lauderdale, Florida, United States (2008), Okinawa, Japan (2004), Bali, Indonesia (2000), Panama City, Panam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NOAA Confirms Fourth Global Coral Bleaching Event (NESDIS 2024-04-26 2024 04 26 Coral-Bleaching-Event-NO-TEXT)
The National Oceanic and Atmospheric Administration (NOAA ) is an American scientific and regulatory agency charged with Weather forecasting, forecasting weather, monitoring oceanic and atmospheric conditions, Hydrography, charting the seas, conducting deep-sea exploration, and managing fishing and protection of marine mammals and endangered species in the US exclusive economic zone. The agency is part of the United States Department of Commerce and is headquartered in Silver Spring, Maryland. History NOAA traces its history back to multiple agencies, some of which are among the earliest in the federal government: * United States Coast and Geodetic Survey, formed in 1807 * National Weather Service, Weather Bureau of the United States, formed in 1870 * United States Fish Commission, Bureau of Commercial Fisheries, formed in 1871 (research fleet only) * NOAA Commissioned Corps, Coast and Geodetic Survey Corps, formed in 1917 The most direct predecessor of NOAA was the Enviro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
