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Evaluating the Habitat Requirements of the Golden Orb Mussel (Quadrula Aurea) for Conservation Purposes

Description: Many freshwater mussels are imperiled, due to a number of interrelated factors such as habitat alteration, degradation of water quality, and impoundments. The Golden Orb mussel (Quadrula aurea, I. Lea, 1859) is endemic to the state of Texas and is currently a candidate for the endangered species list, as the number of known populations has been declining in recent years. Little is currently known about Q. aurea aside from basic distribution data. This study is focused on evaluating a combination of macro-habitat and micro-habitat variables to determine their influence on the distribution and density of this species. Macro-habitat variables, including dominant land cover, surface geology, and soil erodibility factor, did not have a significant relationship with mussel distributions. The best model of micro-habitat variables that impacts the Q. aurea distributions is comprised of relative substrate stability (RSS) at moderate flows and current velocity at low flows. For all mussel species in this study, current velocity at low flows is the primary variable that influences distribution. Q. aurea are associated with habitats where larger sediment particles (large gravel and cobble) help to stabilize the substrate in areas with higher current velocities. An understanding of the preferred habitats for Q. aurea can be used to help focus conservation efforts and practices.
Date: May 2013
Creator: Hammontree, Sarah
Partner: UNT Libraries

Quadrula aurea, Specimen #1502

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; bluish-white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1503

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; bluish-white internal coloring; olive external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1511

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; white internal coloring; yellow external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1510

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; white internal coloring; yellow external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1497

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; white internal coloring; brown external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1498

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; white internal coloring; brown external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1499

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1500

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; bluish-white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1502

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; bluish-white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1515

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Askew, H. G.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1516

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Askew, H. G.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1517

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Creator: Askew, H. G.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1448

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; white internal coloring; brown external coloring; no external sculpturing. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Creator: Askew, H. G.
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1396

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; white internal coloring; tan external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1086

Description: One preserved mussel specimen including the right valve only. The specimen exhibits a round shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Nueces basin. The specimen measures between 0 - 60 mm in length and was assessed to be long dead when collected.
Date: August 10, 1979
Creator: Britton, Joseph & Britton, Mark
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1087

Description: One preserved mussel specimen including the right valve only. The specimen exhibits a round shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Nueces basin. The specimen measures between 0 - 60 mm in length and was assessed to be long dead when collected.
Date: August 11, 1979
Creator: Britton, Joseph & Britton, Mark
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1617

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; moderately thick shell; white internal coloring; tan external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 0 - 60 mm in length and was assessed to be relatively-recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1622

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1623

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; reddish-brown external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1624

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1625

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 60 - 100 mm in length and was assessed to be recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1626

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum

Quadrula aurea, Specimen #1627

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; brown external coloring; no external sculpturing. Collected in the Guadalupe basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
Partner: Elm Fork Natural Heritage Museum