Forest-stream linkages: effects of terrestrial invertebrate input and light on diet and growth of brown trout (Salmo trutta) in a boreal forest stream.

PloS One
Tibor ErősE Bergman

Abstract

Subsidies of energy and material from the riparian zone have large impacts on recipient stream habitats. Human-induced changes, such as deforestation, may profoundly affect these pathways. However, the strength of individual factors on stream ecosystems is poorly understood since the factors involved often interact in complex ways. We isolated two of these factors, manipulating the flux of terrestrial input and the intensity of light in a 2×2 factorial design, where we followed the growth and diet of two size-classes of brown trout (Salmo trutta) and the development of periphyton, grazer macroinvertebrates, terrestrial invertebrate inputs, and drift in twelve 20 m long enclosed stream reaches in a five-month-long experiment in a boreal coniferous forest stream. We found that light intensity, which was artificially increased 2.5 times above ambient levels, had an effect on grazer density, but no detectable effect on chlorophyll a biomass. We also found a seasonal effect on the amount of drift and that the reduction of terrestrial prey input, accomplished by covering enclosures with transparent plastic, had a negative impact on the amount of terrestrial invertebrates in the drift. Further, trout growth was strongly seasonal and f...Continue Reading

References

Jan 3, 2001·Proceedings of the National Academy of Sciences of the United States of America·S Nakano, M Murakami
Apr 28, 2006·The Journal of Animal Ecology·Kristian Meissner, Timo Muotka
Oct 1, 2001·Oecologia·Pierre Legendre, Eugene D Gallagher

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Citations

Jun 20, 2013·The American Naturalist·Njal Rollinson, Jeffrey A Hutchings
Jan 12, 2013·PloS One·Arjan P PalstraJosep V Planas
Dec 10, 2015·Global Change Biology·Stefano LarsenEugenia Marti
May 26, 2021·Biological Reviews of the Cambridge Philosophical Society·Carla Gómez-CreutzbergJason M Tylianakis

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