THE NASHVILLE CRAYFISH
MAY 1, 1996
CUMBERLAND RIVER TRIBUTARIES
ISSUES, MEETINGS AND PUBLIC HEARINGS
Sutton Center Eagle Cam
This one is so good you catch yourself being still not to disturb the eagle. It's in real time!!
Shows front and back views 10 sec apart so you can see the movements without missing anything.
Tennessee <<<click here to see The Southeast Freshwater Extinction Crisis.
From the Center for Biological Diversity
NatureServe Explorer: An
Online Encyclopedia of Life.
Species According To Watersheds in Tennessee
A Guide To
Rare Animals In Tennessee 2009
Tennessee endangered species by county
A rare salamander recently found on the Cumberland Plateau in Tennessee??
Nashville Crayfish Orconectes shoupi USFWS
Commercial Mussel Regs. TWRA>>> This ought to be outlawed!!!!
Endangered US Forest Service
Division of Endangered Species, Species Information on everything from lichens to clams
Endangered species by state and territory
The Declining Amphibious Populations Task Force DAPTF Home Pages
Links to info on southeastern endangered species (GO TO LINK ABOVE FOR DETAIL LISTINGS)
Tennessee has 90 endangered wildlife
North Carolina 61
South Carolina 41
USFWS American Indian Tribal Rights, Federal-Tribal Trust Responsibilities, and the Endangered Species Act
USFWS ENDANGERED SPECIE PROGRAM
The Cumberland region long has been recognized as a center of molluscan endemism in North America (Binney 1885; Ortmann 1918, 1924a, 1925). Among the geographic faunal zones delimited for mussels by van der Schalie and van der Schalie (1950), the Cumberlandian fauna is the most speciose and possesses the greatest number of localized endemics. This area principally comprises the highland portions of the Cumberland and Tennessee river drainage basins.
The shell of the Cumberland monkeyface pearly-mussel (Quadrula intermedia) is medium in size (2.8 in [7.1 cm]), triangular to quadrangular in outline, and marked with numerous tubercles or knobs. The valves are flat and display a deep beak cavity. The outer shell surface is greenish-yellow with green spots, chevrons, zigzags, and sometimes broken green rays. The inner shell surface is white, straw-colored, or salmon.
The life of mussels is complex, and reproduction often depends upon a stable habitat—unaltered stream conditions, clean water, and an undisturbed stream bottom. The cycle also depends upon the abundance of suitable fish hosts to complete the mussel's larval development.
To reproduce, males discharge sperm, which are dispersed by stream currents. In the process of feeding, females nearby or downstream take in sperm,which fertilizes eggs stored in their gills. The gills serve as brood pouches (marsupia), where the glochidia hatch and begin to develop. After a time, these glochidia are released into the stream. A few mussels have inner parts that resemble a tiny minnow and can be manipulated to lure host fish. When a fish gets close to the shell, the mussel expels its glochidia. The fish hosts for this particular pearly-mussel are unknown.
Glochidia have tiny bean-or spoon-shaped valves that attach to the gill filaments of host fish. Glochidia can only progress to the juvenile stage while attached to the fish's gills. Those that do not fortuitously encounter a host fish do not survive when released by the female mussel. They sink to the bottom and die.
When the juvenile has developed a shell and is large enough to survive on its own, it detaches from the host fish and falls to the stream bottom, beginning a long association with a single stretch of stream. Maturing mussels bury themselves in riffles and shoals with only the shell margins and feeding siphons exposed to the water. Some mussels live as long as 50 years or more.
A short-term (or tachytictic) breeder, this mussel produces glochidia in the spring and releases them by mid-to late summer of the same year.
Freshwater mussels feed by siphoning phytoplankton and other plant matter from the water. Indigestible particles are expelled from the shell by reverse siphoning. Silt in the water can kill mussels by clogging their feeding siphons.
There are no known interspecific differences in feeding among freshwater mussels. The glochidia are obligate parasites on the gills or fins of fish. Adult mussels are filter-feeders and consume particulate matter in the water column. Identifiable stomach contents almost invariably include desmids, di-atoms, algae, protozoa, and zooplankton.
Most freshwater mussel species display seasonal variations in activity associated with water temperature and reproduction. Metabolic rate is, in part, positively correlated with temperature. Many ectothermic species have the capacity to adjust their metabolic rates in response to long-term changes in temperature. Thus, metabolic rates do not continue to rise as temperatures rise in the summer, and they do not continue to fall during the winter as temperatures decline.
Some freshwater mussels also show diurnal changes in metabolic rates that indicate a tendency toward nocturnal activity patterns. Mussels may move to the surface to feed at night and move deeper into the substrate during the day; this is one way to avoid predators that hunt by visual contact.
Freshwater mussels are nonmigratory.
This mussel is typically found in shallow, fast-flowing water with a stable, clean substrate of sand or coarse gravel. It requires highly oxygenated water and, therefore, does not survive in still pools.
The monkeyface pearlymussel was historically restricted to the headwaters of the Tennessee River and probably the upper Cumberland River. It is a Cumberlandian species—endemic to the southern Appalachian Mountains and the Cumberland Plateau. Of the 90 species of freshwater mussels found in the Tennessee River, 37 are Cumberlandian; of 78 species found in the Cumberland River, 27 are considered Cumberlandian. Together, these mussels represent the largest number of freshwater mussel species found in any of the world's rivers.
This pearlymussel was apparently never abundant, and the reasons for its decline are not fully understood. Impoundments, siltation, and pollution are presumed to be the major causes. The Tennessee Valley Authority (TVA) has constructed 36 dams in the Tennessee River basin. These dams and reservoirs have inundated mussel shoals upstream, disrupted stream flow, and altered downstream habitat with sporadic cold-water discharges. Siltation caused by strip-mining and poor agricultural practices often covers the substrates of gravel and sand and smothers mussel beds. Because mussels must siphon gallons of water each day to feed, the effects of water pollutants such as herbicides and pesticides are intensified.
Conservation and Recovery
Surveys conducted by the TVA in 1988 and 1989 revealed that mussel populations in the Duck River (which flows into the Tennessee River) had stabilized. The status of mussel populations in the Elkand Powell Rivers (which flow into the Tennessee and Clinch Rivers, respectively) has not yet been determined. Sections of the Powell River appear eligible for "scenic river" status under the National Wild and Scenic Rivers Act. Such a designation would provide additional protection for the Cumberland monkeyface and its habitat.
If the Columbia Dam was completed, most of the Cumberland monkeyface's habitat in the Duck River would have been lost. The dam project was stalled by controversy. Whenever the TVA has expressed an opinion that the Columbia Dam should be abandoned, powerful local interests have continued to push for its completion. The dam was never completed. Demolition started in June 1999.
Letter to Congress dated 5-20-2009
COLORING BOOK OF ENDANGERED SPECIES ...you can go to this page and print it out or order from the EPA