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Marine invasive species advance with a rate of 50 kilometers per decade caused by global warming

13.11.2008
The fast migration of invasive marine species from the south to the north, caused by global warming, is one of the results disclosed today Tuesday during the presentation of the First World Conference on Marine Biodiversity in the Ciudad de las Artes y las Ciencias, in Valencia.

The investigators report that invasive species of macroalgae spread at 50 Km per decade, a distance far larger than that covered by invasive terrestrial plants, possibly due to the rapid dispersion of their propagules in the ocean, according to Nova Mieszkovska, from the Marine Biological Association of the U.K.

The international conference, organised by the Spanish Council of Scientitic Research (CSIC) and the European Network of Excellence on Marine Biodiversity MarBEF, Hill take place until 15 November in the premises of the City of Arts and Science, in Valencia, and will gather over five hundred scientists from 45 countries.

CSIC scientist Carlos Duarte, co-chair of the Conference, explains on the internacional event: “Overwhelming evidence for an accelerating deterioration of the oceans has provided the ímpetus to call the World scientific community on marine biodiversity to gather in this first World Conference”. According to Duarte, the convergente of pressures on the ocean is leading to a global erosion of marine biodiversity “where climate change may deliver the coupe de graçe for a catastrophic collapse”.

“The impacts of the pressure of climate change are particularly dramatic, according to results presented at the Conference, in the abrupt deterioration of the Arctic and Coral reefs” Duarte asserts.

Almost half of the 450 communications at the Conference will address the loss of marine biodiversity and its consequences, whereas the rest will cover the exploitation of marine living resources, as well as exciting discoveries of novel ecosystems in extreme ecosystems, particularly in the deep sea.

DISCOVERIES IN THE DEEP SEA

The research in the deep sea has increased a lot in the last decades thanks to technical developments like submarines, remotely operated vehicles (ROV) and autonomous vehicles (AUV). One of the coordinators of the deep sea program in Spain, CSIC researcher Eva Ramírez, is studying the hydrothermal vents which, discovered in 1977, are one of the principal discoveries of modern oceanography. These submarine volcanoes sustain high densities of fauna which, with specific adaptations, live independently of solar energy.

“Since their discovery, more than 500 hydrothermic vent-species have been described, most endemic, as well as 200 cold water seep species and 400 morphological species of chemosynthethic ecosystems which form on the carcasses of whales” points out Ramirez. For instance, on the mud volcanoes in the Cadiz gulf 13 new species of polychaetes (marine worms) are described as well as a new genus, Bobmarkeya that, for his characteristic appearance, owes his name to Bob Marley.

During the Conference the result of collaboration between more than 160 expert taxonomists on the identification and description of marine species will be presented. Their goal: To complete a database before 2010, which describes all marine life, a worls registry of marine species. The Census of Marine Life is another of the projects which are participating in the conference that catalogues the species in the ocean.

Juan Carlos Castilla, the scientific director of the International Laboratory on Global Change, of the CSIC and the Pontificia Universidad Católica will present his alternative to protected marine reserves. This focuses on units of fishery management, based in administrative concessions to cooperation’s of fishermen who evaluate the sustainability of ecosystems. The responsibilities of these collectives have been more efficient to maintain the ecosystems than traditional marine protected areas. Castilla explains that “as there is no private property in the sea, all being common property, none of the actors involved in exploitation take responsability for marine resources. This model, proposed by Castilla, has been the basis to develop innovative components of Fisheries Law in Chile, a development that is being implemented, under Castilla’s sueprvision, in other countries, such as Japan.

UP TO 1000 MILLION NEW SPECIES OF BACTERIA

A researcher of CSIC at the Insitito de Ciencias del Mar (Institute of Marine Sciences) in Barcelona, Carles Pedrós-Alió, is leading the way in the discovery of new taxons of marine bacteria: “While it is estimated that 100 to 1000 million species of bacteria exist, only 6000 of them have been described, since most of them either have low abundances or show little biological activity. Thanks to the availability of sequencing techniques that are much cheaper, researchers have now begun to explore the largely undiscovered world of microbial diversity.

“The gene pool of these bacteria are one of the vastest resources of genes of the world. We hope to find genes that can be useful to the pharmaceutical industry, medicine, the production of biofuels, bioremediation, etc. . What´s more, a greater understanding of this diversity, hidden until now, will help us understand better the evolution of life”, explains Pedrós-Alió.

Daniel Pauly, of the University of British Columbia in Canada, will present a historical reconstruction of artisianal capture fisheries and will argue that sustainable fisheries are those that are carried out at a small scale. Although this type of artisanal fisheries does not show up in the international statistics, and has decreased over the past decades, Pauly says it is more common than assumed.

Rudolf de Groot, of Wageningen Univeristy, the Netherlands, puts a price tag on the beneftis derived from the protection of coastal ecosystem. He has calculated that effective protection of 20-30% of coastal ecosystems costs between 5.000 and 19.000 million dollars per year, but can generate benefits in terms of improving the surrounding fish stocks, exceeding the costs. As the actual expenses to maintain the currently unsustainable fishing industry are between 15.000 and 30.000 million dollar per year, the Dutch researcher estimates that the creation of th network of MPAs would be a more effcient way to boost the fishing industry than the direct financial assistance they receive.

CSIC scientist Nuria Marbà will present results that demonstrate that the recent invasión of the spanish Mediterranean by the invasive algae Lophocladia lallemandii is leading to a steeper seagrass decline in the Mediterranean coast. According to Marbá, “the invasion of Lophocladia increases seagrass mortality by five fold”.

The paleogeographic study of the historic processes leading to the present distribution of species in the African coast, the impact of the collapse of ice shelves in Antarctica, or the impacts of the acidification of the Southern ocean are among the issues that will be discussed at the Conference.

INSPIRED BY THE SEA
On the occasion of the World Conference of Marine Biodiversity, the City of Arts and Science and CSIC have organized the event Living Sea: Marine Biodiversity Week, an innitative that encompasses a broad array of activities, parallel to the Conference, addressed to the general public, from children to adults, to inform of the benefits Marine Biodiversity delivers to society and human well-being.

Miguel López | alfa
Further information:
http://www.csic.es

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