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Tag: "overfishing" at biology news

Fish extinctions alter critical nutrients in water, study shows

...gs of the National Academy of Sciences, finds that overfishing could threaten the overall health of an ecosystem ...f the more common one. Thus, it appears that human overfishing of the common species, coporo ( Prochilodus mariae ), may have large effects on the ecosystem, in pa...

Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply

...nsom Myers at Dalhousie University, has found that overfishing the largest predatory sharks, such as the bull, great white, dusky, and hammerhead sharks, along the Atlantic Coast of the United States has led to an explosion of their ray, skate, and small shark prey species. "With fewer sharks around, the spe...

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

..., powerful storms, pollution, coastal development, overfishing and other human activity that focus impacts on the reefs. "There appear to be more stressors 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 some...

Fish species plays surprise role in aiding coral reef recovery

...al-algal phase shift be reversed" By simulating overfishing in large experimental plots on the Great Barrier Reef, the researchers in the new study intentionally triggered a phase shift to algal dominance on a healthy reef. They then filmed the reef’s recovery with remote underwater digital videos cameras. Re...

Climate change has surprising effect on endangered naked carp

...reproductive size. Although historically abundant, overfishing and destruction of spawning habitat through dam-building caused the species to become endangered during the 1990s. Diversion of water for agriculture from the lake has been compounded by climate change, leading to a decline in water level in the lake...

World shark attacks dipped in 2005, part of long-term trend

...le, a result of a decline in populations caused by overfishing of the carnivorous creature, which generally is slow to reproduce, Burgess said. "It appears that humans are doing a better job of avoiding being bitten, and on the rare occasion where they actually meet up with a shark, are doing the right thing to...

Overfishing in inland waters reduces biodiversity and threatens health

Systematic overfishing of fresh waters occurs worldwide but is largely un...ies, and because landings are dispersed. Moreover, overfishing may not immediately cause declines in the total catch––and its weight may even transiently increase....

Overfishing may drive endangered seabird to rely upon lower quality food

The effects of overfishing may have driven marbled murrelets, an endangered seabird found along the Pacific coast, to increasingly rely upon less nutritious food sources, according to a new study by biologists at the University of California, Berkeley. The results, to be publ...

Envisat radar surveillance protects endangered prehistoric fish

... CNES, the system is up and running at a time when overfishing has left the 40-million-year-old Patagonian toothfish species on the verge of extinction. Also found off South America, the toothfish has evolved anti-freeze components in its blood, making it one of a small number of species to colonise the sub-A...

Scientists discover global pattern of big fish diversity in open oceans

...he past 50 years, the authors show a clear link to overfishing and highlight a surprising global pattern of open ...d Ransom Myers of Dalhousie University reveal that overfishing has not only reduced the number of fish in the sea, but also the variety: the diversity of tuna, mar...

Oceans more vulnerable to agricultural runoff than previously thought, study finds

...ly, and they're already under a lot of stress from overfishing and aquaculture. It is possible that agricultural runoff could cause additional stress if it does lead to toxic blooms or hypoxia." She and her colleagues plan to conduct follow-up studies to assess the ecological impact of runoff events in the Yaqu...

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