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
Megalonaias nervosa, Specimen #1655

Megalonaias nervosa, Specimen #1655

Date: June 11, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; moderately thick shell; double looped beak sculpturing; white internal coloring; tan external coloring; external sculpturing in the form of ridges. 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
Megalonaias nervosa, Specimen #1675

Megalonaias nervosa, Specimen #1675

Date: May 13, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including the left valve only. The specimen exhibits a quadrate shape; thick shell; double looped beak sculpturing; white internal coloring; black external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures between 100 - 120 mm in length and was assessed to be recently dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Megalonaias nervosa, Specimen #1645

Megalonaias nervosa, Specimen #1645

Date: June 10, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including the left valve only. The specimen exhibits a rhomboidal shape; thick shell; double looped beak sculpturing; white internal coloring; black external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures over 120 mm in length and was assessed to be relatively-recently dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Arcidens confragosus, Specimen #1642

Arcidens confragosus, Specimen #1642

Date: June 18, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including the right valve only. The specimen exhibits a quadrate shape; moderately thick shell; white internal coloring; dark brown external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures between 0 - 60 mm in length and was assessed to be long dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Arcidens confragosus, Specimen #1641

Arcidens confragosus, Specimen #1641

Date: June 18, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including the right valve only. The specimen exhibits a quadrate shape; moderately thick shell; white internal coloring; dark brown 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
Megalonaias nervosa, Specimen #1647

Megalonaias nervosa, Specimen #1647

Date: May 17, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; double looped beak sculpturing; white internal coloring; dark brown external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures over 120 mm in length and was assessed to be long dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Arcidens confragosus, Specimen #1640

Arcidens confragosus, Specimen #1640

Date: June 18, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including the left valve only. The specimen exhibits a quadrate shape; moderately thick shell; white internal coloring; dark brown 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
Megalonaias nervosa, Specimen #1648

Megalonaias nervosa, Specimen #1648

Date: May 17, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including the right valve only. The specimen exhibits a quadrate shape; thick shell; double looped beak sculpturing; white internal coloring; black external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures over 120 mm in length and was assessed to be very-long dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
Megalonaias nervosa, Specimen #1644

Megalonaias nervosa, Specimen #1644

Date: May 13, 2011
Creator: Hammontree, Sarah
Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; thick shell; double looped beak sculpturing; white internal coloring; dark brown external coloring; external sculpturing in the form of ridges. Collected in the Guadalupe basin. The specimen measures over 120 mm in length and was assessed to be relatively-recently dead when collected.
Contributing Partner: Elm Fork Natural Heritage Museum
FIRST PREV 1 2 3 4 5 NEXT LAST