 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| . |  |
. |
Climate Influence On Deep Sea Populations
Washington DC (SPX) Jan 17, 2008 In an article published in the January 16 issue of PLoS ONE, Joan B. Company and colleagues at the Institut de Ci�ncies del Mar (CSIC) in Spain describe a mechanism of interaction across ecosystems showing how a climate-driven phenomenon originated in shelf environments controls the biological processes of a deep-sea living resource. The progressive depletion of world fisheries is one of the key socio-economical issues of the forthcoming century. However, amid this worrying scenario, Company's study demonstrates how a climate-induced phenomenon occurring at a decadal time-scale, such as the formation of dense shelf waters and its subsequent downslope cascading can repeatedly reverse the general trend of overexploitation of a deep-sea living resource. Strong downslope currents associated with intense cascading events displace the population of the shrimp Aristeus antennatus from the fishing grounds, producing a temporary fishery collapse. However, nutritive particles brought by cascading waters to deep regions cause an enhancement of its recruitment process and an increase of its total landings during the following years. These new findings resolve the paradox of a long-overexploited fishery that has not collapsed after 70 years of intense deep-sea trawling. The results will have a high socio-economic impact, since this species is the most valuable deep-sea living resource in the Mediterranean Sea. Because the cascading of dense water from continental shelves is a global phenomenon whose effects on biological processes were not considered in the past, it is hypothesized that its influence on deep-sea ecosystems and fisheries worldwide should be more important than previously thought. In this sense, applying the findings to a global fishery scenario, shelf water cascading sites identified worldwide could be considered as regions favorable for deep-sea demersal fisheries, just as the upwelling zones are considered favorable regions for pelagic fisheries. This paper is particularly timely, since these new results will be of special relevance to the current debate on the shift from shelf to deep-sea fisheries. Community Email This Article Comment On This Article Related Links Public Library of Science Darwin Today At TerraDaily.com
Scientists sound alarm over starfish threat in Indonesia
Jakarta (AFP) Jan 15, 2008The predatory crown of thorns starfish is threatening Indonesia's portion of the "coral triangle," the richest area of coral reef biodiversity on the planet, scientists warned Tuesday. |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2007 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
