The role of terrestrial leaf litter inputs on drift of aquatic invertebrate shredders
Mon, 12/02/2013 - 13:34
Abstract: This study examined the effect of food availability on active drift entry of aquatic invertebrates by comparing drift density at low and high levels of terrestrial leaf litter input in Alder Brook. An emphasis was placed on the proportion of shredders collected during each sampling, who rely most on coarse particulate organic matter as a food source. In order to quantify food available in the stream channel, leaf packs were collected along three transects and weighed to determine dry biomass per stream area. Invertebrate drift samples were collected at high (leaf abscission) and low levels (late summer) of food abundance using three surber nets spaced evenly across the stream channel. Samples were taken at 3-hr intervals over a 24-hr sampling period. Out of eight sampling periods, drift density at low litter input was found to be greatest just after sunset and through the evening hours. Drift densities were significantly higher during 2 sampling periods and numerically higher for an additional 4 sampling periods. Shredders did not comprise the greatest proportion of the drift at low litter input, only accounting for 0.4% of total drifting invertebrates. The proportion of shredders increased to 36.2% at high litter input.
Literary Rights: On
Major: Natural Resources Management and Policy
File Attachments: Final_Manuscript_Simek.docx
Where in the Unite States Can Dual-Flush Toilets Flush Out Savings?
Mon, 12/02/2013 - 13:06
Abstract: Potable water is becoming increasingly scarce in water poor regions of the United States. Reducing the volume of potable water consumed residentially and commercially is vital to ensure a stable water dependent future. Converting a traditional single-flush toilet into a dual-flush toilet is arguably the most effective means for reducing wastewater production in both residential and commercial settings. The objective of this study was to determine where within the United States dual-flush retrofits are cost effective. A cost-benefit analysis illustrating the price of the dual-flush retrofits & the monetary value of the water conserved post installation will be created using Paul Smith’s College campus of northern New York State as a testing site. The study will utilize a total of 145 toilets for both commercial and residential settings. Costs of the installation and purchasing of the product will be used to determine pay-back period and thus, the economic benefit of installing dual-flush toilets. Secondary data from previously completed dual-flush studies determined where within the 50 states dual-flush retrofits are cost effective. The resulting data illustrated relatively long payback periods for the greater United States with the most dramatic differences being seen in Hawaii and the least in Nebraska.
Literary Rights: On
Major: Natural Resources Sustainability
File Attachments: FinalC.docx