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Appalachian elktoe

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existing populations, is to have at least four stable populations of Appalachian elktoe surviving in sites that are thought to be in their historic range. Ideally there will be one population in each of the Little Tennessee, French Broad, and Nolichucky River systems. The second step, which can only be accomplished after the first step is deemed a success, is to create different age groups of the mussels in these river systems. Three age groups must be surviving in order for a population to keep reproducing: juveniles, adults, and developing larvae (glochidia). The third step in the recovery plan is to keep all the new populations of mussels in stabilized and unthreatened habitat. This will be done by monitoring the streams frequently and protecting them from threatening factors of the past, as well as possible threats that might occur in future instances. The fourth and final step to recovering the Appalachian elktoe is to maintain stability in all four populations, and possibly have them increasing by the next ten or fifteen years.
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Appalachian elktoe, but also for the survival of other similar endangered mussels in the area. Another very important action to take is constant monitoring of the existing populations as well as searching and controlling developing populations. Monitoring the species is crucial in recovery, but unfortunately not a lot of information has been collected on the Appalachian elktoe. In order to fully benefit from all the steps of the recovery more information must be found. This is one of the most important actions needed to be taken. Ideally, the species' historical records, habitat requirements, and threats will all be found over the course of the recovery plan. By determining important factors such as previous distribution and exact diet, it will enable the use of the most valuable information on how to save the Appalachian elktoe. Discovering this information also will permit implementation of valuable and informative management plans.
36: 148: 584:(Ellis). Juveniles and reproduction are also seriously affected by even small amounts of sedimentation. When the clean, well-oxygenated water of the mussels' habitat gets a certain amount of sedimentation, the juveniles are not able to develop properly, because the silt clogs the gills of the host fish that they parasitize themselves on. Most mussels are sensitive to many pollutants, and some of the most harmful pollutants are different forms of 621:
Little Tennessee, French Broad, and Nolichucky River systems. The next requirement is to have at least three age classes in each of the six populations. This includes a whole age class of juveniles and gravid females, in order to make sure reproduction is occurring, and occurring steadily. Once this goal is met, the next requirement for de-listing is to make sure that the habitats of these populations are not in danger or susceptible to
104: 123: 600:. Critical habitat is an area that the government has reserved for monitoring and protecting, in an effort to save species currently inhabiting that area. By declaring the Appalachian elktoe's habitat critical, it allows for management plans to be fully implemented and for penalties or fines to be created for partaking in activities that may lead to the species' decline. 398:) have matured and are fully developed. After the larvae are ready, they are then released from the female's gills into the water. Shortly thereafter, the baby mussels will find a host fish to live off for a period of time. When the mussels have grown into juveniles, they will then detach themselves from the host fish, and continue maturation on their own. 637:
so because as more research is found, hopefully more species will have been established more species which will require more funds. The costs of this recovery are difficult to establish also because it normally takes mussels until age five to start reproducing, therefore a full ten years is needed to study reproduction rates and what affects them.
523:. Later studies at that site proved that a similar species of mussel was found in the area, but not the Appalachian elktoe itself. It is still somewhat of a mystery as to whether the species actually did at one time live in the North Fork Holston River, but even so, the species will not be found in that area today. 552:
species' habitat, such as dredging, damming, and other forms of channel manipulation, also have been considered responsible for declining populations. Changing aquatic environments without proper sedimentation control does not only negatively affect river mussels, but most other freshwater species as well.
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The costs of the recovery plan were originally unknown. Because of the lack of information on the species, it is not known exactly what funding needs to be spent on, and also how much needs to be spent. It is estimated that the costs will increase annually over the ten to fifteen-year period. This is
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of the United States in the early 1990s. Although the landscape was changed due to the high winds and heavy rain of the hurricanes, naturally occurring storms do not threaten the Appalachian elktoe. When humans tamper with the naturally occurring state of the streams however, it is very difficult for
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Siltation in the rivers is one of the biggest threats to freshwater mussels. Naturally occurring siltation usually does not bother the species, because it is on a much smaller scale. Siltation caused by human interaction both directly and indirectly affects mussels: it causes the natural patterns of
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Mussels are somewhat stationary; they are unable to move long distances, which is why they live in very specific, stable habitats that fulfill all of their needs. Their immobility hinders their survival, because they are unable to adapt to constantly changing aquatic environments. When their habitat
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This stage of the mussels' life-cycle is one that not all mussels go through. In order for the mussels to survive the separation from the host fish, they need to detach themselves in a suitable area. Only one species of fish has been identified as a host fish for the Appalachian Elktoe: the Banded
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is found mostly in shallow to medium-sized creeks or rivers. They prefer cooler temperature water with fast-flowing to moderately-flowing currents. They are found near sections of the water where there is more rock or gravel at the bottom, as opposed to water that flows over areas with clay or silt
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In order for the species to be completely de-listed, more criteria must be met. Instead of only four viable, reproducing populations of Appalachian elktoe, there must be a least six that are surviving on their own. Like the initial recovery plan, ideally there will be at least one population in the
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Siltation also degrades the quality of the water and exposes mussels to many more pollutants than they would naturally be exposed to. A study done in 1936 found that even one inch of unnatural sedimentation in the habitat causes high mortality rates in most mussels, including the Appalachian ekltoe
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The reproductive cycle of the Appalachian elktoe is also similar to other native freshwater mussels. First, the male releases a trail of sperm into the water column. Then, when females come in contact with the sperm, they take it in through their siphons. Normally this process occurs during either
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Features on the outer shell of the mussel, whether juvenile or adult, are often fine or hard to distinguish. In some cases streaks or waves are apparent, which are most easily noticeable on the dorsal region of the outer shell. Most individuals however have green waves, which are a similar hue as
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Many aspects of the life cycle of the Appalachian Elktoe are still unknown. The species is hard to find, and populations are decreasing. Currently, it is not known what the Appalachian Elktoe feed on, what fish they use as host fish, or how long their life span is. It is however a very sensitive
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Like other mollusks, the Appalachian elktoe feeds itself by picking out particles of food that are in the water. The specifics of their diet has yet to be determined, but it has been assumed that the Appalachian Elktoe survives off the same things as other freshwater mussels: detritus, diatoms,
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into the river systems can seriously affect the species' survival, since the mussels only live in clean, well-oxygenated streams. The runoff and discharge of pollutants from industrial, agricultural, and municipal sources can cause major damage to the sensitive species. Human alterations of the
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The populations in each of these rivers are very small, ranging from two live mussels to fifteen. Normally however, averages of only two to four mussels are found together at the same site of these river systems. The species continues to be very spread out wherever it survives. This can make it
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Originally when the recovery plan was made, the species was supposed to be down-listed from endangered to threatened. There are four main steps to the recovery plan that promote the de-listing of the Appalachian elktoe. The first step, whether by establishing new populations or by protecting
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and keep the species protected at all times. Along with informing local and federal legislation about the endangered species, the public needs to be informed as well. Education programs on mussels in the Southeastern region of the United States are crucial, not only for the survival of the
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has a sheen which is white, blue, and silver. The center of the inner shell changes from a light, almost translucent shine, to a more pink or tan color. Some species have irregular spots or blotches in the center of the nacre that are much darker than the rest of the lining of the shell.
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the rivers to change. It can also create mounds on the bottom of the streams, which not only cover the rocks that mussels prefer to live next to, but also creates areas in the water that are difficult for the mussels' host fish to swim in, causing serious species
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The ultimate goal of the recovery plan is, of course, to upgrade the species off the Endangered Species List. Presently the Appalachian elktoe is considered critically endangered, and it is unknown if they are still in fact actively reproducing.
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In August 1996, a recovery plan was published in order to save the endangered mussels. It is a regional plan that includes all the areas where the species currently lives, and also areas where the species was thought to live in the past.
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As of 1996, only two populations of Appalachian elktoe were known to be surviving. One of the populations was found in the main stem of the Little Tennessee River, and the other was found scattered about in the main stem of the
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Because of the irregularity of the habitat of the Appalachian elktoe and similar mussel species, on September 27, 2002, over 144 miles (232 km) of river area in western North Carolina and eastern Tennessee were deemed
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Neves, R. J., A. E. Bogan, J. D. Williams, S. A. Ahlstedt, and P. W. Hartfield. 1997. Status of Aquatic Mollusks in the Southeastern United States: A Downward Spiral of Diversity. in G. W. Benz and D. E. Collins, editors.
625:. Finally, like the fourth requirement in the first recovery plan, the last criteria for delisting is that all six populations remain stable and hopefully increasing steadily within a period of ten to fifteen years. 363:
Despite the rarity of the species, and the lack of information about the Appalachian elktoe, their habitat is very easily described because of the similarity to that of other species of freshwater mussels.
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Hoggarth, M. A., D. A. Kimberly, and Van Allen, Benjamin G. 2007. A study of the mussels (mollusca: Bivalvia: Unionidae) of Symmes Creek and tributaries in Jackson, Gallia and Lawrence counties, Ohio.
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Hoggarth, M. A., D. A. Kimberly, and Van Allen, Benjamin G. 2007. A study of the mussels (Mollusca: Bivalvia: Unionidae) of Symmes Creek and tributaries in Jackson, Gallia and Lawrence counties, Ohio.
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Strayer, D. L., J. A. Downing, W. R. Haag, T. L. King, J. B. Layzer, T. J. Newton, and S. J. Nichols. 2004. Changing perspectives on pearly mussels, North America's most imperiled animals.
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In order to take all the necessary steps in these recovery plans, some actions need to be taken. The first and most important action to saving the Appalachian elktoe is to utilize
493:(M. Cantrell, Service, pers. comm. 1996; Fridell, pers. observation 1996, 1997; McGrath 1998; T. Savidge, North Carolina Department of Transportation (NCDOT), pers. comm. 2001). 377:
Appalachian elktoe need stability in order to survive, so they are not found in any areas where there is shifting gravel or rocks which can threaten the survival of the mussels.
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Department of Interior. U.S. Fish and Wildlife Service. 1994. Endangered and Threatened Wildlife and Plants; Appalachian Elktoe Determined to be an Endangered Species.
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Department of Interior. U.S. Fish and Wildlife Service. 1994. Endangered and Threatened Wildlife and Plants; Appalachian Elktoe Determined to be an Endangered Species.
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Shaw, K. M., T. L. King, W. A. Lellis, and M. S. Eachles. 2006. Isolation and characterization of microsatellite loci in alasmidonta heterodon (bivalvia: Unionidae).
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The species has been found in areas with varying sizes of rock such as sand, gravel, and boulders, and ideally prefers an area that has a combination of all three.
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Although historical information is unavailable, it is believed that the species once lived in a much larger area in the bigger creeks and streams of the upper
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In the Little Tennessee River system in North Carolina, populations survive in the reach of the main stem of the Little Tennessee River, between the city of
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effective December 23, 1994. The exact cause for the decline of the species is unknown. Many factors have been blamed for the endangerment, including
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on the bottom. (Appalachian elktoe mussels do not survive well in areas of streams where there are clay or silt particles moving in the water current.)
512:, but the Appalachian elktoe have not been spotted in these bodies of water recently, and it has been assumed that they no longer inhabit the areas. 1031: 438:
Currently, the Appalachian elktoe has very fragmented populations: the mussels survive in scattered sections of suitable habitat in portions of the
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Bauer, G., Hochwald, S. and Wilkenat, W. 1991. Spatial distribution of freshwater mussels: The role of host fish and metabolic rate.
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counties (Service 1994, 1996; McGrath 1999; Fridell, pers. observation, 2002), and in scattered reaches of the main stem of the
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Vaughn, C. C., C. M. Taylor. 1999. Impoundments and the Decline of Freshwater Mussels: A Case Study of an Extinction Gradient.
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Vaughn, C. C., C. M. Taylor. 1999. Impoundments and the Decline of Freshwater Mussels: A Case Study of an Extinction Gradient.
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Shaw, K. M., T. L. King, W. A. Lellis, and M. S. Eachles. 2006. Isolation and characterization of microsatellite loci in
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Howard, J.K., K. M. Cuffey. 2006. The functional role of native freshwater mussels in the fluvial benthic environment -
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difficult to find Appalachian elktoe in their habitat, especially when there are only two or three mussels per site.
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respiration or feeding. Once the females have taken the sperm in, they retain it in their gills until the larvae (
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2002. Endangered and threatened wildlife and plants; designating critical habitat for the Appalachian elktoe.
585: 470: 343:(outer shell layer), while more mature mussels generally have a dark brown to greenish-brown periostracum. 922: 540: 439: 336:
The Appalachian elktoe has a "thin, kidney-shaped shell, reaching up to about 10 centimeters (4 inches)."
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from logging, mining, common agricultural practices, and also area construction work.
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is constantly being tampered with, they are unable to fully develop and reproduce.
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Historically, the geographic range of the species was broader and ranged from
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The species was first noticed to be declining in populations some time after
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the Appalachian elktoe, as well as other mussel species, to remain healthy.
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The Appalachian elktoe was listed "endangered" under the authority of the
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It has also been documented that the species used to live in the
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phytoplankton, and zooplankton (Churchill and Lewis, 1921).
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Fridell, J. A. 1999. Appalachian elktoe in North Carolina.
850:) Lea. U.S. Fish and Wildlife Service, Atlanta, Ga. 31 pp. 733:
Fridell, J. A. 1999. Appalachian elktoe in North Carolina.
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Aquatic Fauna in Peril: The Southeastern Perspective
929: 1171:Critically endangered fauna of the United States 846:1996. Recovery plan for the Appalachian elktoe ( 339:Younger mussels normally have a yellowish-brown 386:species, and this makes it difficult to study. 8: 347:the rest of the shell and are often minute. 1151:IUCN Red List critically endangered species 917: 816: 814: 121: 102: 93: 729: 727: 725: 679:10.2305/IUCN.UK.2012.RLTS.T776A3142501.en 677: 80:Learn how and when to remove this message 793: 791: 454:system in North Carolina and Tennessee. 43:This article includes a list of general 709:Integrated Taxonomic Information System 646: 531:in various counties of North Carolina. 420:to mountain river streams in western 7: 1166:Ecology of the Appalachian Mountains 665:IUCN Red List of Threatened Species 654:Cummings, K.; Cordeiro, J. (2012). 49:it lacks sufficient corresponding 25: 485:counties, from below the town of 784:10.1111/j.1471-8286.2005.01235.x 146: 34: 1: 1161:Molluscs of the United States 1202: 1176:Bivalves described in 1834 450:in North Carolina and the 416:The Appalachian elktoe is 755:59(225):60324-60334. 59 504:to the main stems of the 274: 267: 248: 241: 143:Scientific classification 141: 119: 110: 101: 96: 517:North Fork Holston River 1181:Taxa named by Isaac Lea 975:alasmidonta-raveneliana 961:Alasmidonta raveneliana 931:Alasmidonta raveneliana 897:Molecular Ecology Notes 875:Ohio Journal of Science 848:Alasmidonta raveneliana 822:Ohio Journal of Science 776:Molecular Ecology Notes 774:(Bivalvia: Unionidae). 703:Alasmidonta raveneliana 658:Alasmidonta raveneliana 368:Alasmidonta raveneliana 305:Alasmidonta raveneliana 278:Margaritana raveneliana 252:Alasmidonta raveneliana 64:more precise citations. 18:Alasmidonta raveneliana 1186:ESA endangered species 541:Endangered Species Act 440:Little Tennessee River 350:Inside the shell, the 772:Alasmidonta heterodon 128:Critically Endangered 911:Conservation Biology 867:59(225):60324-60334. 799:Conservation Biology 623:habitat destruction 569:Southeastern region 234:A. raveneliana 113:Conservation status 97:Appalachian elktoe 672:: e.T776A3142501. 506:French Broad River 300:Appalachian elktoe 27:Species of bivalve 1138: 1137: 1110:Open Tree of Life 923:Taxon identifiers 801:13(4): 912–920. 561:Hurricane Frances 463:Fontana Reservoir 314:freshwater mussel 296: 295: 290: 286:Unio swananoensis 282: 136: 90: 89: 82: 16:(Redirected from 1193: 1131: 1130: 1118: 1117: 1105: 1104: 1092: 1091: 1079: 1078: 1066: 1065: 1053: 1052: 1040: 1039: 1027: 1026: 1014: 1013: 1004: 1003: 991: 990: 978: 977: 965: 964: 963: 950: 949: 948: 918: 865:Federal Register 834: 833: 818: 809: 795: 786: 768: 762: 753:Federal Register 749: 734: 731: 720: 719: 717: 715: 697: 691: 690: 688: 686: 681: 651: 598:critical habitat 529:Nolichucky River 475:Tuckasegee 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Index

Alasmidonta raveneliana
references
inline citations
improve
introducing
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Conservation status
Critically Endangered
IUCN 3.1
Scientific classification
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Eukaryota
Animalia
Mollusca
Bivalvia
Unionida
Unionidae
Alasmidonta
Binomial name
I. Lea
Synonyms
species
freshwater mussel
Unionidae
North Carolina
Tennessee
periostracum
nacre
glochidia

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