Filters: Tags: NortheasternRegion (X) > partyWithName: Pam L Fuller (X)
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Available data for the American Eel (Anguilla rostrata) indicate that, overall, there have been declines in recruitment, population, and escapement during three generations (36 years). A recent report indicated that barriers to migration (dams and weirs), passage through turbines at hydropower dams, habitat degradation or loss, and overharvest were likely the greatest threats by humans across the species’ range. Although eels are able to ascend many smaller barriers, recent studies have documented a tenfold reduction in eel density above each potentially passable barrier. For example, the number of juvenile eels migrating to Lake Ontario passing over hydropower dams fell from 935,000 in 1985 to approximately 8,000...
The Shortnose Sturgeon (Acipenser brevirostrum), the smallest of the three sturgeon species that occur in the eastern United States, requires clean rock or rubble above the head of tide for spawning. It has suffered from the construction of dams in the region. This species migrates upriver from lower reaches of river systems or from upper estuary areas to spawn, but has been blocked from reaching spawning areas by dams. Other spawning habitat has been impaired by water flow changes from water withdrawals and dam operations, particularly peaking power operations. Sturgeon species, in general, are very sensitive to changes from the natural water flow conditions.
Aquatic vegetation is the key to Bridle Shiner (Notropis bifrenatus) survival. The loss of aquatic vegetation makes this species vulnerable to predation, often by piscivorous fishes. Land use practices that increase turbidity also affect this visual predator.
The Connecticut River is the largest river in New England. It flows 410 miles (660 kilometers) from its source to the Long Island Sound. New Hampshire and Vermont share about two-thirds of the river's length, or 275 miles (443 kilometers). The Connecticut River: is named after the Pequot word “quinetucket,” meaning “long tidal river.” The European corruption of that begat “Connecticut.” provides 70 percent of all the freshwater entering Long Island Sound. The Connecticut River has more than 1,000 dams on its tributaries and 16 dams on its main stem, 12 of which are hydropower projects. Many of these dams are more than 100 years old. The first dinosaur tracks in North America were discovered in Triassic rocks...
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