Researchers at Lancaster University have found a way to detect subtle early warning signs that reveal a frog population is at risk from pollution.
Worldwide, amphibian populations are declining due to habitat loss, disease and pollution which is cited as a major threat to their survival.
Scientists publishing in Scientific Report, have found evidence of stress in tadpoles taken from ponds most impacted by pollution caused by nutrients and pesticides. They say the technique they used to spot these changes could offer an early warning system for populations at risk.
Working over a three-year period they looked at common frog populations in urban and rural ponds subject to varying degrees of pollution. Using a special kind of biochemical 'fingerprinting' detected via infrared spectroscopy, the team looked at tissues taken from tadpoles as well as frogspawn to examine their biochemical makeup - searching for markers such as glycogen which can vary as the organism responds to stress. The team found strong evidence of higher levels of stress in tadpoles living in those ponds most impacted by pollution, more so than frogspawn embryos, which are protected to some degree by their jelly coat.
These subtle detrimental effects are otherwise very hard to detect using conventional biological toxicity tests and analytical chemistry but the new technique of biospectroscopy can act as an early warning before a local population becomes extinct. The test could potentially help scientists carrying out environmental monitoring on frog and amphibian populations to indicate which freshwater systems are at risk from pollution, before it's too late.
Dr Crispin Halsall, an environmental chemist at Lancaster University, said: "Amphibians are particularly vulnerable to contamination due to their sensitive life-stages, particularly tadpoles. Agricultural pesticides and nutrients from fertilisers are a threat to frogs during their breeding season.
"This is the first time we have been able to show that infrared spectroscopy of this kind can pick up on the differences between tadpole populations which have been exposed to low but varying levels of pollution."
Prof Frank Martin of the University of Central Lancashire who has pioneered biospectroscopy methods in both medical and environmental applications, said: ""What we have is a rapid, cost-effective tool for assessing subtle effects of pollution in a vulnerable species. The next steps would be to establish a database of fingerprint spectra of different tissue types as well as non-affected 'control' organisms to compare to pollutant-affected organisms."
beth broomby | EurekAlert!
Scientists uncover the role of a protein in production & survival of myelin-forming cells
19.07.2018 | Advanced Science Research Center, GC/CUNY
NYSCF researchers develop novel bioengineering technique for personalized bone grafts
18.07.2018 | New York Stem Cell Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences