Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sex reversal in frogs ­ an effect of drugs in the environment

23.02.2007
Frogs are more sensitive to hormone-disturbing environmental pollutants than was previously thought. Male tadpoles that swim in water with relevant levels of such substances become females, according to a new study from Uppsala University that will be published in the scientific journal Environmental Toxicology and Chemistry (ET&C) in May.

A great number of medicines that humans take are released through waste waters and end up in nature. The contraceptive pill estrogen ethynylestradiol has been found in waters in many countries, and this has been linked to disturbances in reproduction in wild fish.

Researcher Cecilia Berg and doctoral candidate Irina Pettersson at the Department of Environmental Toxicology, Uppsala University, have shown that low, environmentally relevant concentrations of this substance cause sex reversal in frogs.

“This is the first clear evidence that estrogen in nature really can have a detrimental effect on frogs. Previous studies have used considerably higher concentrations than are normally found in nature,” says Cecilia Berg.

When tadpoles swim in water with low concentrations of ethynylestradiol, all of them develop ovaries instead of what is the normal process, namely, that half of the frogs develop ovaries and the other half testicles. The research team has shown this in two species of frogs, the common frog (Rana temporaria) and the African clawed frog (Xenopus tropicalis). It is during the tadpole stage that reproductive organs begin to develop in frogs, a process that is regulated by the hormone system.

“Our findings show that frogs are more sensitive to hormone-disrupting environmental pollutants than we previously thought,” says Cecilia Berg.

Anneli Waara | alfa
Further information:
http://www.uu.se

More articles from Ecology, The Environment and Conservation:

nachricht Global threat to primates concerns us all
19.01.2017 | Deutsches Primatenzentrum GmbH - Leibniz-Institut für Primatenforschung

nachricht Reducing household waste with less energy
18.01.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH

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: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Arctic melt ponds form when meltwater clogs ice pores

24.01.2017 | Earth Sciences

Synthetic nanoparticles achieve the complexity of protein molecules

24.01.2017 | Life Sciences

PPPL physicist uncovers clues to mechanism behind magnetic reconnection

24.01.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>