Navigation Links
Indigenous water frogs under threat
Date:11/29/2007

Angers/Leipzig. Indigenous water frogs can be crowded out by immigrant or imported species. This is the finding of a Franco-German study. The scientists investigated water frog populations in France and Northern Spain and noticed that the marsh frog (Rana ridibunda), which normally occurs only in Eastern Europe, has the potential to crowd out indigenous species like Grafs hybrid frog (Rana grafi) and the Iberian water frog (Rana perezi). The scientists believe this ability is related to the fact that the marsh frog lives longer and grows faster than the indigenous species. In addition, the female marsh frogs produce more progeny than their competitors, the researchers write in the scientific journal Comptes Rendus Biologies. The marsh frog has now spread from Central Asia as far as France and Spain. This latest spread is attributed to imports of live animals for culinary purposes. As the foreign species mix with the indigenous species, the indigenous water frogs are being pushed back into just a few areas. Imports of invasive species by humans are regarded as one of the main threats to species diversity on earth, alongside climate change.

Most stable marsh frog populations in France and Switzerland originated from frogs bred for gourmet restaurants or imported directly from various source countries. The frog fauna along larger river flood plains in both countries has now altered significantly in favour of the new frog species. Until now though, it was not clear why the new species had been able to establish themselves in the face of the indigenous species. The team of scientists investigated over 700 water frogs from 22 locations in the Rhone drainage basin in France and four locations in the Ebro drainage basin in Spain. "We noticed that the introduced marsh frog has a high competitive potential, particularly in high-oxygen, low-salinity freshwater. In these conditions the indigenous frogs hardly stand a chance," declares Dr Dirk Schmeller of the
'/>"/>

Contact: Tilo Arnhold
presse@ufz.de
49-341-235-1269
Helmholtz Association of German Research Centres  
Source:Eurekalert

Page: 1 2

Related biology news :

1. Freshwater supplies threatened in central Pacific
2. University of Oregon researcher finds that on waters surface, nitric acid is not so tough
3. Innovative civil engineering application promises cleaner waters
4. Safe water: simpler method for analyzing radium in water samples cuts testing time
5. Researchers find new taste in fruit flies: carbonated water
6. Low oxygen in coastal waters impairs fish reproduction
7. Extra gene copies were enough to make early humans mouths water
8. Acid rain has a disproportionate impact on coastal waters
9. HARDY rice: less water, more food
10. New microsensor measures volatile organic compounds in water and air on-site
11. Alternative methods proposed to detect pesticides and antibiotics in water and natural food
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Indigenous water frogs under threat
(Date:7/9/2014)... climate change shifts the geographic ranges in which animals ... has on their parasites. Does an increased range for ... well? , Not necessarily, says a team of UC ... Kuris. In a study published in the Journal ... for some species, the opposite may happen: Hosts may ...
(Date:7/9/2014)... NY, July 9, 2014Biofuels derived from the oils produced ... fossil fuels. To achieve this goal, optimization of cost ... open pond systems, is needed. Sapphire Energy has developed ... open pond algae cultivation systems, described in Industrial ... Inc., publishers. The article is available on the ...
(Date:7/9/2014)... URBANA, Ill. With over 100 diseases that can ... the top of the most wanted list? University of ... reason that more research is needed on the fungus ... associated with cool, damp growing conditions but Macrophomina ... hot and dry drought conditions. , "As the climate ...
Breaking Biology News(10 mins):Not at home on the range 2Not at home on the range 3Not at home on the range 4Controlling contamination in open algae ponds for biofuels 2Climate change provides good growing conditions for charcoal rot in soybeans 2Climate change provides good growing conditions for charcoal rot in soybeans 3
... of how an abundance of fossils have been marvellously preserved ... of Africa has been solved by a team of geologists ... have established that an ancient wind brought life to the ... the dead. Sarah Gabbott, Jan Zalasiewicz and colleagues investigated ...
... a strategic alliance for catalysis research, "Munich Catalysis." In addition ... aspect of this cooperation will be the development of innovative ... global demand for energy and base chemicals on a long-term ... to two million euros a year. The cooperation is based ...
... The Great Tit is a common garden bird of many ... thought of as fairly inquisitive but it has long been ... surroundings. Some birds known as "fast" or "proactive" ... or "reactive" birds are more cautious. The differences are ...
Cached Biology News:Up to 20 million euros for Munich Catalysis research cooperation 2Up to 20 million euros for Munich Catalysis research cooperation 3Bird-brained? Birds' personalities are correlated with their hormone levels 2
(Date:1/15/2014)... 15, 2014 TaiGen Biotechnology Company, Limited ("TaiGen") today ... R-Pharm, a leading Russian pharmaceutical company, to develop and ... Russian Federation , Turkey ... is a novel antibiotic for the treatment of bacterial ...
(Date:1/14/2014)... 2014  3D Communications, a leading provider of strategic communications services to ... events in the United States and ... Cox , JD, is returning to the firm,s Washington, ... 3D after more than two years of service as Associate Commissioner ...
(Date:1/14/2014)... SAN DIEGO and BETHESDA, Md. ... they are joining together with two institutes from the ... more reliable tools for bringing safer, more effective treatments ... with the National Center for Advancing Translational Sciences (NCATS) ...
(Date:1/14/2014)... Rockville, MD (PRWEB) January 14, 2014 ... dedicated to developing innovative information technology solutions for ... other health care stakeholders, announced today the signing ... the US Food and Drug Administration (FDA). ...
Breaking Biology Technology:TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4Former FDA Associate Commissioner Returns To 3D Communications 2Organovo Announces Collaboration with National Institutes of Health 2Organovo Announces Collaboration with National Institutes of Health 3Global Record Systems Announces Research Collaboration Agreement with FDA to Create a Novel “Big Data” Paradigm for Collection of Patient Safety and Outcomes Information 2
... previously reported, communicated in late 2007 ... ... Biotech Products, L.P.,today modified prescribing information for PROCRIT(R) (Epoetin alfa),following guidance from ... within the erythropoiesis-stimulating agent,(ESA) class., Modifications to the label were based ...
... by the Environmental Protection Agency (EPA) to fine California ... nano-pesticides is being applauded by David Rejeski, the director ... should receive a big pat on the back for ... federal pesticide law that has been on the books ...
... FRANKLIN LAKES, N.J., March 7 BD (Becton,Dickinson and Company) ... that it would present at the following investor healthcare,conferences:, ... 13, 2008 8:45 a.m. Greenwich Mean Time (4:45 a.m. ... Company 28th Annual Healthcare Conference March 20, 2008 ...
Cached Biology Technology:Ortho Biotech Modifies Prescribing Information for PROCRIT(R) (Epoetin alfa) 2Ortho Biotech Modifies Prescribing Information for PROCRIT(R) (Epoetin alfa) 3Ortho Biotech Modifies Prescribing Information for PROCRIT(R) (Epoetin alfa) 4Ortho Biotech Modifies Prescribing Information for PROCRIT(R) (Epoetin alfa) 5Ortho Biotech Modifies Prescribing Information for PROCRIT(R) (Epoetin alfa) 6Ortho Biotech Modifies Prescribing Information for PROCRIT(R) (Epoetin alfa) 7
...
... An entire pressurized perfusion system ... in physiology, biophysics, electrochemistry, or general ... as little as 100 microliters of ... eight solutions in milliseconds from a ...
...
Request Info...
Biology Products: