“Forecasting how an invader will affect the growth and production of a specific native fish species is very relevant to conservation groups and government agencies hoping to conserve those fish,” says Biology graduate student Mike Yuille.
Mr. Yuille is the lead author of a study that suggests for the first time that several native fish species have incorporated the bloody red shrimp into their diet over a multi-seasonal period.
In addition to using traditional stomach content analyses, researchers measured the carbon and nitrogen signatures of muscle tissues of three potential Hemimysis predators (round goby, yellow perch, and alewife) to get a long-term picture of eating habits.
All three predators exhibited increased nitrogen or carbon signatures, suggesting they had been feeding on prey with signatures very similar to Hemimysis. The team found these signatures in sites with dense populations of bloody red shrimp.
Like zebra mussels, Hemimysis anomala is native to the Black Sea and Caspian Sea. It probably arrived in the Great Lakes through the ballast water of transoceanic ship. In 2006 it was discovered in Lake Michigan and has now been found in all of the Great Lakes except Lake Superior.
Mr. Yuille co-authored the research with Queen’s associate professor Shelley Arnott, Linda Campbell, and Timothy Johnson at the Ontario Ministry of Natural Resources’ Glenora Fisheries Station in Picton.
These findings will be published in the Journal of Great Lakes Research.
Anne Craig | EurekAlert!
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Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
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Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
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