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Submerged wood inhabiting macoinvertebrates of the Elm Fork of the Trinity River, Texas: Assemblage analyses, comparisons to the benthic fauna, and a study of Cyrnellus fraternus (Trichoptera: Polycentropodidae)

Description: Taxonomic composition and spatio-temporal variability of macroinvertebrates inhabiting snags were examined from an 8-km segment of the Elm Fork of the Trinity River. Seventy-seven macroinvertebrate taxa were collected from submerged wood during the study. Assemblages were highly variable spatially and temporally, especially among seasons. An ordination of species and environment did not find snag taxa to have striking correlations with many of the selected environmental variables, although there were some trends in flow-mediated species distributions. There were significant seasonal differences in the abundances of some taxa, particularly among the Chironomidae (Diptera). The Tribe Orthocladiini was numerically abundant during the winter, while the Tribes Chironomini and Tanytarsini dominated the summer and autumn. Additionally, this study included a secondary production and microdistribution analysis of a population of the caddisfly Cyrnellus fraternus. Distributions of C. fraternus were restricted to snags, the most stable substratum for retreat building and for resisting periodic high waters. Larvae were not found in the soft sand and mud benthic habitats near submerged wood. The insects were multivoltine with a minimum of three generations per year. Pupae were collected July through September and adults emerged from May through October. The population overwintered as larvae. Estimated annual production was 1,015.4 mg/m2/yr. Mean standing stock biomass was 61.24 mg/m2, the cohort production/biomass ratio was 4.59, and the annual production/biomass rate was 16.58/yr for this population. Standing stock biomass ranged from 1.6 to 349.1 mg/m2 during the year and was significantly higher in autumn and summer than winter. Larvae were more abundant in the lower portions of the study area where flow was reduced for much of the year, than in the upper reaches, characterized by higher current velocities. C. fraternus larvae were found in their highest numbers on snags with dense deposits of silt and sand.
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: August 2001
Creator: Johnson, Zane B.
Partner: UNT Libraries
open access

Remote Sensing and GIS for Nonpoint Source Pollution Analysis in the City of Dallas' Western Watersheds

Description: This report describes the findings of a study conducted on the watersheds of "Lake Lewisville, Lake Ray Roberts, Lake Grapevine and the Elm Fork of the Trinity River between Lake Lewisville and Frazier Dam," which are all part of the upper Trinity drainage basin (p. 31). The study examines the potential benefit of "remote sensing and geographic information systems (GIS) for watershed management" in and around Dallas, Texas (p. i).
Date: August 1988
Creator: University of North Texas. Department of Biological Sciences.
Partner: UNT College of Arts and Sciences
open access

Remote Sensing and GIS for Nonpoint Source Pollution Analysis in the City of Dallas' Eastern Watersheds

Description: This report describes the findings of a study conducted on the Eastern Watersheds of Lake Lavon, Lake Ray Hubbard, Lake Tawakoni, Lake Palestine and Lake Fork, which are located within the Blackland Prairie, Post Oak Savannah and Pineywoods provinces. These watersheds are among nine that provide drinking water to Dallas, Texas. The study examines the potential benefit of "remote sensing and geographic information systems (GIS) for watershed management" in these five watersheds (p. iii).
Date: June 1989
Creator: University of North Texas. Department of Biological Sciences.
Partner: UNT College of Arts and Sciences

Fusconaia lananensis, Specimen #1531

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: Askew, H. G.
Partner: Elm Fork Natural Heritage Museum

Fusconaia lananensis, Specimen #1530

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 recently dead when collected.
Date: unknown
Creator: Askew, H. G.
Partner: Elm Fork Natural Heritage Museum

Quincuncina mitchelli, Specimen #1532

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits an elliptical 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

Quincuncina mitchelli, Specimen #1533

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; bluish-white internal coloring; brown 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: Mitchell, J. D.
Partner: Elm Fork Natural Heritage Museum

Quadrula petrina, Specimen #1534

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; 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 petrina, Specimen #1535

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: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula petrina, Specimen #1536

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 relatively-recently dead when collected.
Date: unknown
Creator: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Quadrula petrina, Specimen #1537

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 100 - 120 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 petrina, Specimen #1401

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; 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 petrina, Specimen #1402

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; green 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 petrina, Specimen #1403

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; 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
Partner: Elm Fork Natural Heritage Museum

Quadrula petrina, Specimen #1404

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; 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
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

Truncilla macrodon, Specimen #1513

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits an elliptical 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: Cummings, W. F.
Partner: Elm Fork Natural Heritage Museum

Quadrula houstonensis, Specimen #1529

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: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Lampsilis hydiana, Specimen #1538

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 100 - 120 mm in length and was assessed to be relatively-recently dead when collected.
Date: unknown
Partner: Elm Fork Natural Heritage Museum

Quadrula houstonensis, Specimen #1435

Description: One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; white internal coloring; tan external coloring; external sculpturing in the form of pustules. The specimen measures between 0 - 60 mm in length and was assessed to be recently dead when collected.
Date: unknown
Creator: Kennedy, W. M.
Partner: Elm Fork Natural Heritage Museum

Popenaias popei, Specimen #1545

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

Lampsilis bracteata, Specimen #1539

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: Singley, J. A.
Partner: Elm Fork Natural Heritage Museum

Lampsilis bracteata, Specimen #1540

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 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
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