Characterizing short-term light dynamics in forested headwater streams
| Autor: | Dana R. Warren, Emily D. Heaston, Matthew J. Kaylor |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Canopy geography geography.geographical_feature_category Ecology 010604 marine biology & hydrobiology STREAMS Understory Aquatic Science Atmospheric sciences 010603 evolutionary biology 01 natural sciences Forest age Riparian forest Environmental science Terrestrial ecosystem Ecology Evolution Behavior and Systematics Light exposure |
| Zdroj: | Freshwater Science. 36:259-271 |
| ISSN: | 2161-9565 2161-9549 |
| Popis: | Light controls local- and reach-scale primary production in forested headwater streams. In terrestrial ecosystems, short periods of elevated light beneath canopies (sunflecks) are instrumental in maintaining understory autotrophic production, but sunflecks are unexplored and uncharacterized in stream systems. We described short-term light dynamics in 4 forested headwater streams in the western Cascade Mountains of Oregon. We quantified the prevalence and characteristics of sunflecks, compared the timing of light exposure at stream sites to a sensor in full sun, and evaluated whether sunfleck characteristics differed between stream sections in old-growth vs second-growth forest. Sunflecks were common in streams. A minimum of 3 individual sunflecks/d occurred at each of 47 sensor locations. Short sunflecks were more common than long sunflecks, a result consistent with findings in terrestrial studies. However, streams had longer sunflecks than upland forests in this region, probably because canopy ga... |
| Databáze: | OpenAIRE |
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