Overview

Distribution

endemic to a single nation

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Global Range: (250-1000 square km (about 100-400 square miles)) This species is known from eastern Gulf drainages in Louisiana and Mississipi. In Mississippi, it is found in Lake Pontchartrain, Coastal Rivers, Pearl River, and Pascagoula River drainages (Jones et al., 2005). Vidrine (1993) reports this species from eastern Louisiana in most drainages to the north (Pearl River, Tchefuncte River, Tangipahoa River, Tickfaw River, Amite River).

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Ecology

Habitat

Habitat Type: Freshwater

Comments: This species is known from small to medium coastal rivers in Louisiana and Mississippi (Vidrine, 1993). Other habitat information is lacking.

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Habitat and Ecology

Habitat and Ecology
This species is known from small to medium coastal rivers in Louisiana and Mississippi (Vidrine 1993).

Systems
  • Freshwater
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Migration

Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

This species probably is rather sessile with only limited movement in the substrate. Passive downstream movement may occur when mussels are displaced from the substrate during floods. Major dispersal occurs while glochidia are encysted on their hosts.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 21 - 80

Comments: Vidrine (1993) reports this species from eastern Louisiana in most drainages to the north (Pearl River, Tchefuncte River, Tangipahoa River, Tickfaw River, Amite River). Brown and Banks (2001) list 1990s records for the Amite and Tangipahoa Rivers in Louisiana. In Mississippi, it is found in Lake Pontchartrain, Coastal Rivers, Pearl River, and Pascagoula River drainages (Jones et al., 2005). This species was not recorded during surveys of the Strong River in Mississippi in 2001, despite historical documentation in the basin (Darden et al., 2002). Wieland (2000) documented it in a mussel bed in teh Pearl River in LeFleur's bluff State Park in Jackson, Mississippi.

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Global Abundance

Unknown

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Life History and Behavior

Reproduction

The host fish is not known.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: This species is known from a restricted range in the north section of eastern Louisiana into southern Mississippi. Status and trend information are largely unknown and although range is somewhat limited, lack of adequate threat information precludes a higher ranking.

Intrinsic Vulnerability: Unknown

Environmental Specificity: Narrow to moderate.

Comments: This species is known from small to medium coastal rivers in Louisiana and Mississippi (Vidrine, 1993). Other habitat information is lacking.

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IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2011

Assessor/s
Cummings, K. & Cordeiro, J.

Reviewer/s
Böhm, M. & Collen, B.

Contributor/s
Dyer, E., Soulsby, A.-M., Whitton, F., McGuinness, S., De Silva, R., Milligan, H.T., Kasthala, G., Thorley, J., Herdson, R., McMillan, K. & Collins, A.

Justification
Pleurobema beadleianum has been assessed as Least Concern due to its wide distribution from the north section of eastern Louisiana into southern Mississippi and southwest Alabama. However, specific population information is lacking, therefore, further survey work is needed to assess the population status accurately and and the effects of threats on the population.

History
  • 1996
    Lower Risk/near threatened
    (Baillie and Groombridge 1996)
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Global Short Term Trend: Unknown

Global Long Term Trend: Unknown

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Population

Population
There is no population information available for this species.

Population Trend
Unknown
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Threats

Degree of Threat: Unknown

Comments: Although specific threats to this species have not been addressed in detail, the primary reason for the imperilment of Mississippi's unionid mussels is the destruction and alteration of their habitats. Factors responsible for freshwater mussel habitat destruction in Mississippi include reservoir construction (Coldwater, Pearl, Little Tallahatchie, Tennessee, Tombigbee, Yalobusha, and Yocona Rivers plus many tributaries), channel degradation for navigation and flood control, sand and gravel mining, deterioration of water quality (excessive sediment from agriculture, pollution) (Jones et al., 2005).

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Major Threats
There is no specific threat information available for this species; it is likely that this species is being impacted upon by general freshwater threats within this region, however, these are not thought to constitute major threats at present.
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Management

Global Protection: Few (1-3) occurrences appropriately protected and managed

Comments: The species was recently found in lower section of the Pearl River in the south end of the LeFleur's Bluff State Park in Jackson, Mississippi (Wieland, 2000).

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Conservation Actions

Conservation Actions
Williams et al. (2011, from K. Cummings pers. comm. 2010) lists this species as vulnerable according to the AFS assessment. However, specific population information is lacking, therefore, further survey work is needed.
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Wikipedia

Pleurobema beadleianum

Pleurobema beadleianum is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

This species is endemic to the United States.

References

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