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Latest Trophic cascade Stories

Sea Otters Helping In The Fight Against Poor Water Quality
2013-08-27 04:24:07

redOrbit Staff & Wire Reports - Your Universe Online Scientists studying seagrass beds in one of the largest estuaries in central California are crediting its recovery on the return of sea otters to the coastal region, according to new research published in this week’s edition of the Proceedings of the National Academy of Sciences. According to Suzi Gage of BBC News, seagrass at Elkhorn Slough in Monterey County was “heading for extinction” due to an increase in pollution in...

Cod Has A Key Role In The Whole Baltic Sea
2012-04-18 10:48:24

A new investigation put in evidence the key role of cod as regulator of the whole Baltic Sea ecosystem. The study shows that when the cod population in the central Baltic increases, it spreads into larger areas and spills over into adjacent marginal systems where it usually does not occur, as for example the Gulf of Riga. On the other hand, when the cod population size in the central Baltic decreases, it concentrates into the southern Baltic Sea and disappears from the other systems where...

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2011-07-15 07:40:00

The worldwide decline of top predators, or "consumers", such as wolves, sharks and lions, is threatening to drive other species to extinction, an international team of 24 scientists reported on Thursday. The research shows for the first time the critical importance that large animals have within the world's ecosystem. "Until recently, large apex consumers were ubiquitous across the globe and had been for millions of years. The loss of these animals may be humankind's most pervasive influence...

2010-11-25 22:11:14

A measure widely advocated as a means of assessing the health of marine ecosystems is an ineffective guide to trends in biodiversity, and more direct monitoring is needed, a new study has found. The findings "“ published this week in Nature "“ followed an examination of  whether changes in fishery catches reflect changes in the structure of marine food webs, and therefore are a suitable guide to assess the impacts of fishing on marine ecosystem health. CSIRO Wealth from...

2010-11-17 21:46:57

The most widely adopted measure for assessing the state of the world's oceans and fisheries led to inaccurate conclusions in nearly half the ecosystems where it was applied according to new analysis by an international team led by a University of Washington fisheries scientist. "Applied to individual ecosystems it's like flipping a coin, half the time you get the right answer and half the time you get the wrong answer," said Trevor Branch, a UW assistant professor of aquatic and fishery...

2010-07-09 08:00:00

STONY BROOK, N.Y., July 9 /PRNewswire-USNewswire/ -- A compendium on trophic cascades and how they operate in the world's major ecosystems has been published for the first time. The term "trophic cascades" refers to the follow-on effects of top predator removal from an ecosystem, and, until now, there has not been a comprehensive synthesis of this phenomenon. Evidence accumulated in this volume indicates that trophic cascades operate in nearly all ecosystems around the world, both at sea...

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2010-07-01 09:08:18

A new analysis of the extinction of woolly mammoths and other large mammals more than 10,000 years ago suggests that they may have fallen victim to the same type of "trophic cascade" of ecosystem disruption that scientists say is being caused today by the global decline of predators such as wolves, cougars, and sharks. In each case the cascading events were originally begun by human disruption of ecosystems, a new study concludes, but around 15,000 years ago the problem was not the loss of a...

2010-03-26 09:10:21

Forget top-to-bottom only. New Cornell University evolutionary biology research shows how plants at the bottom of the food chain have evolved mechanisms that influence ecosystem dynamics as well. (Science, March 26, 2010.) "The ecology and interactions of most organisms is dictated by their evolutionary history," said Anurag Agrawal, associate professor of ecology and evolutionary biology (EEB), the study's senior author. In food webs, predators help suppress populations of prey by eating...

2005-08-01 16:33:05

Willow trees, riparian willow warblers and beaver dams once were bountiful in an area near the town of Banff, Alberta, Canada. But once wolves left this area, elk grew more plentiful, browsing heavily on young willows. Today, there is little trace of beavers, and sparrows have replaced the warblers in what is now a grassland meadow. These profound changes were driven by the absence of the wolf, a top predator. That's the compelling finding of the paper, "Human Activity mediates a Trophic...


Word of the Day
ambsace
  • Bad luck; misfortune.
  • The smallest amount possible or the most worthless thing.
The word 'ambsace' comes from a Latin word meaning 'both'.