Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

More than 31 freshwater species have 'moved' to Galicia over past century

14.01.2011
Galician researchers have studied the evolution in the introduction of non-native fresh water species in Galicia over the past century, and have compared this with the rest of the Iberian Peninsula. The results show that 31 exotic aquatic species out of the 88 recorded for the entire Iberian Peninsula have become established in the region over the past century.

An analysis of the introduction of non-native species in Galicia and the Iberian Peninsula carried out by researchers from the University of Santiago de Compostela (USC) and the University of Coruña (UDC) has shown not only the number of species introduced over the past 100 years, but also the periods during which the greatest number of new species appeared, and also current trends.

It has taken longer for exotic species to be introduced in Galicia than in the rest of the Iberian Peninsula. "While the species introduced in the Iberian Peninsula at the start of the 20th Century took between 80 and 90 years to be recorded in Galicia, this delay has been virtually negligible since the 1990s", María J. Servia, coordinator of the study and a researcher at the UDC, tells SINC.

According to Servia, species introduced in the Iberian Peninsula are now detected at "practically" the same time in Galicia. The data analysed show that 1995 marked a turning point, coinciding with the approval of the Schengen Treaty, which opened up the borders of European countries to the free movement of people and goods. From this time on, the pace of introduction of new species in Galicia has been the same as for the rest of Spain.

The study, which has been published in Biodiversity and Conservation, also shows that 31 exotic aquatic species out of the total of 88 recorded throughout the Iberian Peninsula as a whole have become established in Galicia, including fish, amphibians, insects, plants, molluscs, invertebrates, reptiles, mammals and crustaceans.

Some of the most significant exotic species introduced in Galicia include the Asian clam (Corbicula fluminea), the red swamp crayfish (Procambarus clarkii), the mosquitofish (Gambusia holbrooki), and aquatic plants such as Elodea canadensis and the water hyacinth (Echhornia crassipes).

Introduction of invertebrates and plants on the rise

"Although the introduction of new vertebrate species has slowed down, the entry of new invertebrate and plant species has continued to increase over recent years, with many of these coming from the aquarium trade", says Fernando Cobo, lead author of the study and director of the USC Hydrobiology Station.

The researchers are calling for this kind of trade to be regulated as a matter of "urgency", since "there is still a perception that exotic plants and invertebrates, except in exceptional cases, are inoffensive".

The biologists say that invasive species pose a "serious" threat to the conservation of biodiversity in the areas they establish themselves in, because they compete with native species for both habitat and food. "Freshwater courses have not been immune to this problem", say the authors of the study, who add that the building of large hydraulic infrastructures have made a "major" contribution to the phenomenon.

Because of its climatic and geographical characteristics, Galicia has a large wealth of freshwater species, many of which are endemic to the region. Until now, the introduction of non-indigenous species in the region has been "relatively" slow, because of its geographical isolation and the small size of its river basins, which do not allow for commercial shipping. However, over recent decades an increasing number of exotic species have appeared in Galician waters.

References:

Cobo, Fernando; Vieira-Lanero, Rufino; Rego, Enrique; Servia, Maria J. "Temporal trends in non-indigenous freshwater species records during the 20th century: a case study in the Iberian Peninsula" Biodiversity and Conservation 19(12): 3471-3487, noviembre de 2010.

SINC | EurekAlert!
Further information:
http://www.plataformasinc.es

More articles from Ecology, The Environment and Conservation:

nachricht Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen

nachricht A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

Im Focus: Fast, convenient & standardized: New lab innovation for automated tissue engineering & drug

MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.

MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...

Im Focus: Silencing bacteria

HZI researchers pave the way for new agents that render hospital pathogens mute

Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Molecular Force Sensors

20.09.2017 | Life Sciences

Producing electricity during flight

20.09.2017 | Power and Electrical Engineering

Tiny lasers from a gallery of whispers

20.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>