02165nas a2200217 4500008004100000245008800041210006900129300001200198490000700210520153500217653001601752653001401768653001001782653001401792653001401806653001801820653001801838100001701856700002201873856005201895 1998 eng d00aTributary Water Quality Feedback from the Spread of Zebra Mussels: Oswego River, NY0 aTributary Water Quality Feedback from the Spread of Zebra Mussel a453-4630 v243 a

Dramatic changes in the water quality of the Oswego River system, including Oswego Harbor, since the early 1990s brought about by zebra mussel (Dreissena polymorpha) infestation are documented. The analysis is based on summertime (June to September) water quality monitoring of the Oswego Harbor (1981 and 1993), the mouth of the Oswego River (1983 to 1993), and three upstream sites in the Oswego River system (1990, 1991, and 1994), and two benthic surveys conducted along a 70 km reach of the system to the mouth of the Oswego River in 1994. It is estimated that water in the Oswego River was filtered more than twice over this length by the mussels in 1994 (at median flow) before it reached Oswego Harbor. The zebra mussel infestation converted the Oswego River and the harbor from a turbid (low clarity), phytoplankton-rich, nutrient-depleted system, to a system with distinctly greater clarity, reduced phytoplankton concentrations, enriched in soluble reactive phosphorus. Most of this impact was attributable to dense zebra mussel populations (e.g., ∼ 30,000 indiv/m2) in a 5 km river section, located > 60 km upstream of Oswego Harbor. These changes in tributary water quality represent a form of feedback associated with the spread of the zebra mussel from the Laurentain Great Lakes. Increased attached algae growth in the Great Lakes proximate to the inflow of infested tributaries is a reasonable expectation in response to the more available form of the phosphorous load.

10achlorophyll10anutrients10ariver10atributary10aturbidity10awater quality10aZebra mussels1 aEffler, S.W.1 aSiegfried, C., A. uhttp://dx.doi.org/10.1016/S0380-1330(98)70835-402131nas a2200229 4500008004100000245005900041210005900100300001200159490000700171520148600178653002601664653002101690653001801711653001801729100001901747700001901766700001801785700002201803700001601825700001901841856004101860 1996 eng d00aImpact of Zebra Mussel Invasion on River Water Quality0 aImpact of Zebra Mussel Invasion on River Water Quality a205-2140 v683 a

The biology of the zebra mussel is reviewed as it relates to water-quality problems in rivers. A relationship between population densities of the zebra mussel and their respiration demands for oxygen is developed, which can be used to support the analysis of the impact of zebra mussel infestation on the oxygen resources of streams and rivers. Dramatic changes in the water quality of the Seneca River, N.Y., a major tributary to Lake Ontario, have been brought about by zebra mussel infestation. These changes are documented from 3 years of monitoring data. The infestation converted the Seneca River from a turbid, phytoplankton-rich, nutrient-depleted system, with nearly saturated oxygen concentrations, to a river with high clarity, low-phytoplankton concentrations, enriched in dissolved nutrients, with greatly undersaturated oxygen concentrations. The degradation of oxygen resources was severe enough to cause violations of New York State standards for daily minimum and daily average concentrations for a number of days in the late summer of 1993. The associated loss in the waste assimilative capacity of the river is confounding waste discharge management and planning efforts in the river basin. This form of degradation is expected for other systems as the zebra mussel infestation spreads. The impact is expected to be greatest in rivers and streams with high concentrations of phytoplankton, large areas of rock substrate, and limited reaeration capacity.

10aassimilative capacity10adissolved oxygen10awater quality10aZebra mussels1 aEffler, S., W.1 aBrooks, C., M.1 aWhitehead, K.1 aSiegfried, C., A.1 aWalrath, L.1 aCanale, R., P. uhttp://www.jstor.org/stable/25044708