Analysis of common water sampling techniques used to assess lake trophic state
Sat, 12/05/2015 - 00:21
Abstract: Volunteer lake management programs (VLMPs) across the country employ different surface water sampling techniques to establish long-term trends in nutrient availability and trophic state. The three most common techniques are a surface grab (SG), 2m integrated tube sampler (IT), and a discrete sampler, such as a Van Dorn or Kemmerer bottle deployed to a depth of 1.5m (DD). These various sampling techniques vary not only in depth, but also in cost and ease of use. The objectives of my study are to 1) determine if there is a statistical difference in chlorophyll-a (chl-a) and total phosphorus (TP) concentration obtained between the three different sampling techniques, 2) determine if the treatment effect (sampling device) varies over time, 3) determine which method has the least amount of variability, and 4) determine if sampling technique ultimately influences trophic state classification. The study was conducted on Upper St. Regis Lake, Paul Smiths, New York. I collected 10 samples from the lake using the three different techniques during the months of June – August, 2015. I found a significant difference in chlorophyll-a concentration between sampling techniques during June and July, and during the month of July for TP. The three sampling techniques yielded similar variability for chlorophyll-a but significantly different variability for TP. Ultimately, the trophic status rating for Upper St. Regis was not effected by sampling technique. My study suggests that VLMP should utilize a SG or IT rather than a costly DD sampler.
Literary Rights: On
Major: Environmental Sciences
Food Plots for White-tailed Deer: Effects on the Browse Intensity of Commercial Tree Species in Western New York
Mon, 12/05/2011 - 10:09
Abstract: Throughout North America high densities of white-tailed deer (Odocoileus virginianus) are creating problems that affect humans as well as the natural environment; such as property damage (ex. deer/car accidents), crop damage due to browse, changes in forest species composition, as well as the creation of alternate stable states throughout the northeastern forests of the U.S. This study examined whether food plots for white-tailed deer are increasing, decreasing or having no effect on the browse intensity of commercial tree species in the northern hardwood/coniferous forests of western New York. Spring and summer browse intensity was determined at six sites throughout Wyoming, Cattaraugus, and Erie counties; three forested sites with food plots and three forested sites without food plots that were similar in species composition. The study found that food plots were causing an increase in browse intensity on commercial tree species to areas immediately adjacent (0-2 meters) to the food plots. However, further analysis that excluded measurements taken for subplots one at both food plot and non-food plot sites showed that non-food plot sites had a significantly greater proportion browsed. The findings suggest that if food plots are used as a management option for white-tails in western New York a buffer zone of at least 2 meters outside the food plot should be incorporated to account for the overflow of deer browse.
Literary Rights: On
Major: Natural Resources Management and Policy
File Attachments: Complete_Capstone_Project.docx