Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Salamanders Are a More Abundant Food Source in Forest Ecosystems Than Previously Thought

19.11.2014

Advanced statistical methods used in study increase previous population estimates

In the 1970s, ecologists published results from one of the first whole-forest ecosystem studies ever conducted in Hubbard Brook, New Hampshire. In the paper, scientists reported that salamanders represent one of the largest sources of biomass, or food, of all vertebrates in the forest landscape.


Southern Redback Salamander

Semlitsch’s study measured the population density and biomass of the Southern Redback Salamander in the Ozark Highlands in Missouri. Credit: Katie O’Donnell

Now, using new sampling and statistical techniques not available during the past study, researchers at the University of Missouri have estimated that the population of salamanders in forested regions of the Missouri Ozarks are 2-4 times higher than originally thought, and in other regions of the eastern U.S. may be on average 10 times higher. Scientists believe that acknowledging salamanders as one of the main food sources in forest ecosystems could help drive conservation efforts and forest management.

“Our lab works to identify salamanders as an influential part of the forest ecosystem and food chain,” said Ray Semlitsch, Curators Professor of Biological Sciences in the College of Arts and Science at MU.

“Using the latest research methods, we calculated the population size of Southern Redback Salamanders in Ozark Forests and their value as a food source. We found that 1.88 billion salamanders inhabit one district of the Mark Twain National Forest alone, which is roughly 1,400 metric tons of biomass. For comparison, that’s equivalent to the biomass found in most whitetail deer in that region!”

There are two methods for estimating abundance. One is to simply count salamanders and plot the numbers on a grid representing the forest landscape. That is how the estimates were calculated in the 1970s.

However, Semlitsch’s group, armed with the knowledge that the majority of salamanders are underground at any given time, captured animals on the surface during intensive repeated surveys over two years and used statistical modeling to produce a more thorough accounting of variation in salamander population density.

“Our abundance models also take into account environmental factors,” Semlitsch said. “Factors such as date of collection, time since last rainfall, slope of the terrain and forest canopy cover are plugged into the model to help predict variation in the surface population over time; that’s what makes our model so powerful. The hidden biodiversity of amphibians is something we don’t generally consider; we forget that salamanders are nocturnal and mostly unobserved. Therefore, I think most will be amazed at the quantities of food out there that we just don’t see.”

Semlitsch believes that future research should consider the importance of amphibians to ecosystem processes such as soil enrichment. Future forest management techniques and protection of salamanders are important to healthy forest ecosystems and should be considered in all forest management decisions, Semlitsch said.

The study, “Abundance, biomass production, nutrient content, and the possible role of terrestrial salamanders in Missouri Ozark forest ecosystems,” was published in the Canadian Journal of Zoology, and was funded in part by the U.S. Forest Service cooperative Agreement with support from the Missouri Department of Conservation. Katie O’Donnell, a doctoral student in the Division of Biological Sciences at MU, and Frank Thompson, director of the Forest Service Experimental Station at MU, co-authored the paper.

-30-

Editor’s Note: To read an extended interview with Semlitsch about this study, please visit: “Semlitsch talks about his study on salamander abundance.”

Jeff Sossamon | EurekAlert!
Further information:
http://munews.missouri.edu/news-releases/2014/1118-salamanders-are-a-more-abundant-food-source-in-forest-ecosystems-than-previously-thought/

More articles from Ecology, The Environment and Conservation:

nachricht Upcycling of PET Bottles: New Ideas for Resource Cycles in Germany
25.06.2018 | Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF

nachricht Dry landscapes can increase disease transmission
20.06.2018 | Forschungsverbund Berlin e.V.

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: Future electronic components to be printed like newspapers

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...

Im Focus: First evidence on the source of extragalactic particles

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...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

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...

Im Focus: Breaking the bond: To take part or not?

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...

Im Focus: New 2D Spectroscopy Methods

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....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

A smart safe rechargeable zinc ion battery based on sol-gel transition electrolytes

20.07.2018 | Power and Electrical Engineering

Reversing cause and effect is no trouble for quantum computers

20.07.2018 | Information Technology

Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern

20.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>