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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Effects Of Experimentally Added Salmon Subsidies On Resident Fishes Via Direct And Indirect Pathways, Scott F. Collins, Colden V. Baxter, Amy Marcarelli, Mark S. Wipfli
Effects Of Experimentally Added Salmon Subsidies On Resident Fishes Via Direct And Indirect Pathways, Scott F. Collins, Colden V. Baxter, Amy Marcarelli, Mark S. Wipfli
Amy Marcarelli
Artificial additions of nutrients of differing forms such as salmon carcasses and analog pellets (i.e. pasteurized fishmeal) have been proposed as a means of stimulating aquatic productivity and enhancing populations of anadromous and resident fishes. Nutrient mitigation to enhance fish production in stream ecosystems assumes that the central pathway by which effects occur is bottom-up, through aquatic primary and secondary production, with little consideration of reciprocal aquatic-terrestrial pathways. The net outcome (i.e. bottom-up vs. top-down) of adding salmon-derived materials to streams depend on whether or not these subsidies indirectly intensify predation on in situ prey via increases in a shared …
Ionic Liquid Extraction Unveils Previously Occluded Humic-Bound Iron In Peat Soil Pore Water, Timothy J. Veverica, Evan S. Kane, Amy Marcarelli, Sarah A. Green
Ionic Liquid Extraction Unveils Previously Occluded Humic-Bound Iron In Peat Soil Pore Water, Timothy J. Veverica, Evan S. Kane, Amy Marcarelli, Sarah A. Green
Amy Marcarelli
Globally, peatland ecosystems store tremendous amounts of C relative to their extent on the landscape, largely owing to saturated soils which limit decomposition. While there is still considerable uncertainty regarding CO2 production potential below the water table in peatland ecosystems, extracellular Fe reduction has been suggested as a dominant pathway for anaerobic metabolism. However, colorimetric methods commonly used to quantitate Fe and partition between redox species are known to be unreliable in the presence of complex humic substances, which are common in peatland pore water. We evaluated both the standard o-phenanthroline (o-P) Method and an ionic liquid extraction (ILE) Method …
Nutrient Additions To Mitigate For Loss Of Pacific Salmon: Consequences For Stream Biofilm And Nutrient Dynamics, Amy Marcarelli, Colden V. Baxter, Mark S. Wipfli
Nutrient Additions To Mitigate For Loss Of Pacific Salmon: Consequences For Stream Biofilm And Nutrient Dynamics, Amy Marcarelli, Colden V. Baxter, Mark S. Wipfli
Amy Marcarelli
Mitigation activities designed to supplement nutrient and organic matter inputs to streams experiencing decline or loss of Pacific salmon typically presuppose that an important pathway by which salmon nutrients are moved to fish (anadromous and/or resident) is via nutrient incorporation by biofilms and subsequent bottom-up stimulation of biofilm production, which is nutrient-limited in many ecosystems where salmon returns have declined. Our objective was to quantify the magnitude of nutrient incorporation and biofilm dynamics that underpin this indirect pathway in response to experimental additions of salmon carcasses and pelletized fish meal (a.k.a., salmon carcass analogs) to 500-m reaches of central Idaho …
An Invasive Riparian Tree Reduces Stream Ecosystem Efficiency Via A Recalcitrant Organic Matter Subsidy, Madeline M. Mineau, Colden V. Baxter, Amy Marcarelli, G. Wayne Minshall
An Invasive Riparian Tree Reduces Stream Ecosystem Efficiency Via A Recalcitrant Organic Matter Subsidy, Madeline M. Mineau, Colden V. Baxter, Amy Marcarelli, G. Wayne Minshall
Amy Marcarelli
A disturbance, such as species invasion, can alter the exchange of materials and organisms between ecosystems, with potential consequences for the function of both ecosystems. Russian olive (Elaeagnus angustifolia) is an exotic tree invading riparian corridors in the western United States, and may alter stream organic matter budgets by increasing allochthonous litter and by reducing light via shading, in turn decreasing in-stream primary production. We used a before-after invasion comparison spanning 35 years to show that Russian olive invasion increased allochthonous litter nearly 25-fold to an invaded vs. a control reach of a stream, and we found that this litter …
Quantity And Quality: Unifying Food Web And Ecosystem Perspectives On The Role Of Resource Subsidies In Freshwaters, Amy Marcarelli, Colden V. Baxter, Madeleine Mineau, Robert O. Hall Jr.
Quantity And Quality: Unifying Food Web And Ecosystem Perspectives On The Role Of Resource Subsidies In Freshwaters, Amy Marcarelli, Colden V. Baxter, Madeleine Mineau, Robert O. Hall Jr.
Amy Marcarelli
Although the study of resource subsidies has emerged as a key topic in both ecosystem and food web ecology, the dialogue over their role has been limited by separate approaches that emphasize either subsidy quantity or quality. Considering quantity and quality together may provide a simple, but previously unexplored, framework for identifying the mechanisms that govern the importance of subsidies for recipient food webs and ecosystems. Using a literature review of >90 studies of open-water metabolism in lakes and streams, we show that high-flux, low-quality subsidies can drive freshwater ecosystem dynamics. Because most of these ecosystems are net heterotrophic, allochthonous …