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

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

Date: May 2013
Creator: Hammontree, Sarah
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 ...
Contributing Partner: UNT Libraries
Quadrula aurea, Specimen #1671

Quadrula aurea, Specimen #1671

Date: June 11, 2011
Creator: Hammontree, Sarah; Mabe, Jeffery; Perry, Heather & Pulliam, Lauren
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; moderately thick shell; white internal coloring; orange 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.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1657

Quadrula aurea, Specimen #1657

Date: June 8, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Mabe, Jeffery & Perry, Heather
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; orange 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.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1658

Quadrula aurea, Specimen #1658

Date: June 8, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Mabe, Jeffery & Perry, Heather
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; orange external coloring; external sculpturing in the form of pustules. Collected in the Guadalupe basin. The specimen measures between 0 - 60 mm in length and was assessed to be relatively-recently dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1659

Quadrula aurea, Specimen #1659

Date: June 8, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Mabe, Jeffery & Perry, Heather
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; tan external coloring; external sculpturing in the form of pustules. Collected in the Guadalupe basin. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1656

Quadrula aurea, Specimen #1656

Date: June 8, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Mabe, Jeffery & Perry, Heather
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; white internal coloring; tan external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1625

Quadrula aurea, Specimen #1625

Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
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.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1622

Quadrula aurea, Specimen #1622

Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
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.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1617

Quadrula aurea, Specimen #1617

Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
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.
Contributing Partner: Elm Fork Natural Heritage Museum
Quadrula aurea, Specimen #1627

Quadrula aurea, Specimen #1627

Date: June 18, 2011
Creator: Hammontree, Sarah; Pulliam, Lauren; Perry, Heather & Mabe, Jeffery
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.
Contributing Partner: Elm Fork Natural Heritage Museum
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