Impacts of Minnow Species Composition on Marsh Feeding Ecology: A Look at Minnow Composition in Heron Marsh
Mon, 11/30/2020 - 16:07
Abstract: Minnows play an important role in marsh ecosystems as both predator and prey. The abundance of minnows in water systems makes them important tools for studying the feeding ecology of small prey fish. Minnow traps were set within specific regions and plots located in the Heron Marsh in the Adirondack Park, New York. These traps were baited and checked the next day, and minnows were identified by species then released. Trophic guilds were assigned to each minnow species based on literature and feeding habits. ANOVA tests were conducted to compare minnow species composition from the fall of 2020 in all regions of the marsh. Histograms were used to compare length-frequency over time and sites where minnows frequent. The composition of trophic guilds showed that carnivores were scarce, as creek chub only over 100mm were considered predatory, and they were not as frequent as smaller creek chub. Omnivorous generalist feeders were common but no specific site in the marsh had more omnivorous feeders than other sites. Finally, the abundance of insectivores was high in most sites, and highest in the forest ecology trail site. Length frequency of the two most caught fish, creek chub and finescale dace, were represented with histograms. Creek chub under 100mm were more abundant in every site than individuals larger than 100mm. Similarly, finescale dace 70mm and smaller were more common in every site.
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File Attachments: Capstone Final Draft - Emily Schmeltz.docx
An Ecological History of the Albany Pine Bush, Albany NY
Mon, 11/30/2020 - 15:45
Abstract: Paleoecology allows us to look backward in time thousands of years to see the long-term ecological history of an area. The main focus was to conduct the first exploratory investigations of the wetland located in the Albany Pine Bush Preserve (APBP) and Stump Pond deposits and the first directly dated ecological history of the pine bush. Irregular fire regimes and land development have caused a massive loss to the pine bush. Between 1940 and 1990 the pine bush has experienced an 81% change in land cover. Despite this, the APBP is home to many rare and endangered species in need of habitat restoration. Three samples (APB1-A, APB1-C, & APB2) were collected from a wetland within the boundaries of the APBP and one sample (Stump-1) was collected from a nearby pond. Cores were analyzed for pollen assemblages to reconstruct the tree community. APB cores revealed that Pinus and Quercus pollen grains made up the majority of all pollen found from Present – 6600 years ago Stump-1 pollen assemblages were dominated by Pinus and Picea indicating that between 6600 and 10,600 years ago the ecosystem transformed into the pitch pine- scrub oak ecosystem we see today. This information can help the APBP justify future preservation and restoration work.
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File Attachments: Capstone Paper Full.docx
Cultural eutrophication of Lower Saint Regis Lake using diatoms and organic content as indicators of eutrophication.
Tue, 04/28/2020 - 12:06
Abstract: Cultural eutrophication can greatly affect water quality, leading to algae blooms and can affect fish communities. Throughout the history of Paul Smith’s Hotel and College, development along Lower St. Regis lake has led to increases in eutrophic conditions, which has detrimental effects on water quality. In this study, a sediment core from Lower St. Regis Lake was analyzed to determine when past eutrophication events occurred. This was accomplished using species counts of diatoms from every 1.0 cm of sediment. The relative abundance of diatom species such as Tabellaria flocculosa, Asterionella formosa, and Fragilaria crotonensis were used as indicators of more eutrophic conditions. Loss on ignition (LOI) was also used to measure the organic content in the sediment at increments of 0.5 cm. The higher percent lost on ignition indicates higher productivity in the lake and more eutrophic conditions. Some samples from the sediment core were also dated using lead-210 to create a timeline that could be compared to known dates of events occurring along the lake that could have affected the trophic status of Lower St. Regis Lake. There was a sudden spike in the relative abundance of F. crotonensis and an increase in organic content at a depth of 20 cm in the core, indicating that conditions became more eutrophic. Based on the lead-210 dates, this spike in F. crotonensis and organic content occurred between 1898 and 1908, when development around the lake was increasing and Paul Smith’s Hotel added indoor plumbing with poor wastewater treatment practices.
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File Attachments: Capstone_0.docx