An international team has now found that these ecosystems appear to keep the energy exchanges in balance -- a finding that the scientists called surprising.
Scientists around the world who have conducted research on the exchange of energy, materials and organisms between these connected ecosystems have come to call the phenomenon"allochthony" -- meaning the consumption of resources by organisms residing in one ecosystem, when that energy was produced in another ecosystem.
The researchers also found that consumer allochthony varies with feeding traits for aquatic invertebrates, fish and terrestrial arthropods -- such as insects, beetles and spiders -- but not for terrestrial vertebrates such as birds and rodents. Finally, they reported that allochthony is nearly twice as great in arid climates than tropical ones for aquatic invertebrates, but remains steady for fish across varied climates.
Contributing to the research at Penn State were postdoctoral scholar Veronica Saenz, graduate student Kierstyn Higgins and recently graduated master's degree student Alice Belskis, all in ecosystem science and management. Also contributing to the research were: James Larson, U.S. Geological Survey, Upper Midwest Environmental Sciences Center; Christina Murphy, U.S.
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