A dramatic increase in deformed frogs and other amphibians is being caused by a range of environmental factors, all of which ultimately can be linked to human impacts on habitat, but the primary cause of many of the deformities is an epidemic of a key parasite.
These findings are the results of eight years of research by scientists around the world, and are presented in the February issue of Scientific American by researchers from Oregon State University and the University of Wisconsin.
The cause of a disturbing increase in amphibians with deformities are explored in a new article in Scientific American by researchers from Oregon State University and the University of Wisconsin. Extra legs, such as those found on the frogs in these images, are one of the most common deformities.
Click on image to go to downloadable photo
According to the researchers, the story of the parasitic trematode reveals just how complicated natural ecological processes can be, and how difficult it is to trace problems to their underlying cause. In its life cycle, the parasite at times depends on snails for survival and birds for reproduction and transportation. The amphibians, themselves, are actually just an intermediary host.
"We need to understand the complex relationships among human activity, the parasite and its hosts, and the environment in which they interact," Johnson said.
There are many interrelationships among various factors. Snails, for instance, are necessary to the life cycle of the trematode that can cause frog deformities. But snail populations may be surging at some sites due to fertilizer runoff and cattle manure that cause algal blooms and more food for the snails. A survey of the western U.S. in 2000 found that 44 of the 59 wetlands in which amphibians were infected by this parasitic trematode were reservoirs, farm ponds or other artificial bodies of water.
And water pollutants or UVB radiation, while not directly causing the majority of deformities, may set the stage by weakening an amphibians immune system and making it more vulnerable to a parasitic infection.
"The challenge to scientists becomes teasing apart these agents to understand their interactions," the researchers said in this article. "Humans and other animals may be affected by the same environmental insults harming amphibians. We should heed their warning."
Andrew Blaustein | EurekAlert!
Global threat to primates concerns us all
19.01.2017 | Deutsches Primatenzentrum GmbH - Leibniz-Institut für Primatenforschung
Reducing household waste with less energy
18.01.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
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...
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...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
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...
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...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
24.01.2017 | Earth Sciences
24.01.2017 | Life Sciences
24.01.2017 | Physics and Astronomy