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Agenda - 06-19-2012 - 8a
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Agenda - 06-19-2012 - 8a
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BOCC
Date
6/19/2012
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Regular Meeting
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Agenda
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8a
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Minutes 06-19-2012
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4 <br />tributaries of the Eno River is not known, although it has been reported to be <br />present in Sevenmile Creek. It was the consensus of the meeting attendees that <br />the presence of hydrilla in a flowing water (lotic) system is fairly unique. <br />Hydrilla Impacts <br />Given the propensity for this invasive plant to dominate native aquatic plants to the <br />point that these other plants are effectively eliminated, it is safe to say that hydrilla <br />has infested the upper Eno River and is likely to continue to spread. Some <br />meeting attendees think that hydrilla has surpassed the nuisance level in the Eno <br />and now represents a serious threat the ecosystem of the river. Hydrilla infestation <br />is problematic for several reasons: a) public perception, b) water quality impacts, <br />and c) ecosystem impacts. <br />According to the Superintendent of the ERSP, Keith Nealson, "Hydrilla is the <br />number one resource management problem in the Eno; more so than water flow." <br />He reported that during the summer, when hydrilla is widely abundant in the river, <br />he receives many questions and complaints about the presence of the plant. <br />Hydrilla is very unsightly in the river since it spreads widely and is highly visible. <br />The plant also interferes with fishing such that the Eno is virtually "unfishable" from <br />July to October. In general, hydrilla has a very negative impact on the recreational <br />experience of visitors to the state park. <br />Water quality in the Eno can be negatively impacted by the presence of hydrilla. <br />During the summer months, when hydrilla is abundant in the river, the <br />concentration of dissolved oxygen (DO) in the river can be reduced. The naturally <br />occurring DO cycle can also be impacted on a daily and seasonal basis, as much <br />lower DO concentrations than normal can occur at night during the summer <br />months, and when hydrilla plants die in the late summer months, the <br />decomposition of the plants consumes a great deal of DO. These processes <br />negatively impact water quality and can cause fish kills in the river. <br />Hydrilla can also cause ecosystem impacts. The Roanoke Bass (ambloplites <br />cavifrons) is naturally found in only the Tar and Neuse River basins in North <br />Carolina. The extent of these sunfish has been greatly reduced such that it is now <br />listed as Significantly Rare by the NC Natural Heritage Program. NC Wildlife <br />Resources Commission staff report that hydrilla in the Eno seems to be reducing <br />the number of larger sized Roanoke Bass in the river. The longer term impact of <br />hydrilla on the Roanoke Bass in the Eno is not currently known, nor whether or not <br />hydrilla is impacting any other significant or endangered species that exist in the <br />Eno River. <br />In addition, a relatively new disease has been linked to hydrilla. Avian vacuolar <br />myelinopathy (AVM) is a disease that has been found to affect the brain tissue of <br />waterfowl in the southeastern US. Plant- eating waterfowl, including Canada geese <br />and mallard ducks, become sick with AVM and die as a result of ingesting <br />Orange County Department of Environment, Agriculture, Parks & Recreation <br />PO Box 8181, Hillsborough, NC 27278 <br />Phone: (919) 245 -2510 Fax: (919) 644 -3351 <br />
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