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2,503 Matching Results
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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)
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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 …
Date:
August 2001
Creator:
Johnson, Zane B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Remote Sensing and GIS for Nonpoint Source Pollution Analysis in the City of Dallas' Western Watersheds
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.
Object Type:
Book
System:
The UNT Digital Library
Remote Sensing and GIS for Nonpoint Source Pollution Analysis in the City of Dallas' Eastern Watersheds
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.
Object Type:
Book
System:
The UNT Digital Library
Quincuncina mitchelli, Specimen #1454
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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Popenaias popei, Specimen #1455
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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Popenaias popei, Specimen #1456
One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate 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 relatively-recently dead when collected.
Date:
unknown
Creator:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Truncilla macrodon, Specimen #1457
One preserved mussel specimen including both the left and right valves. The specimen exhibits an elliptical shape; white internal coloring; green 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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Truncilla macrodon, Specimen #1463
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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Lampsilis bracteata, Specimen #1464
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:
Askew, H. G.
Object Type:
Specimen
System:
The UNT Digital Library
Lampsilis bracteata, Specimen #1465
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 recently dead when collected.
Date:
unknown
Creator:
Askew, H. G.
Object Type:
Specimen
System:
The UNT Digital Library
Lampsilis bracteata, Specimen #1466
One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval 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:
Askew, H. G.
Object Type:
Specimen
System:
The UNT Digital Library
Fusconaia askewi, Specimen #1468
One preserved mussel specimen including both the left and right valves. The specimen exhibits a round shape; white internal coloring; reddish-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.
Object Type:
Specimen
System:
The UNT Digital Library
Fusconaia askewi, Specimen #1469
One preserved mussel specimen including both the left and right valves. The specimen exhibits a round 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.
Object Type:
Specimen
System:
The UNT Digital Library
Truncilla macrodon, Specimen #1474
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 long dead when collected.
Date:
unknown
Creator:
Drake, N. F.
Object Type:
Specimen
System:
The UNT Digital Library
Megalonaias nervosa, Specimen #1475
One preserved mussel specimen including both the left and right valves. The specimen exhibits a rhomboidal shape; white internal coloring; brown external coloring; external sculpturing in the form of pustules. The specimen measures between 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date:
unknown
Creator:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Quadrula petrina, Specimen #1477
One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; 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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Quadrula petrina, Specimen #1478
One preserved mussel specimen including both the left and right valves. The specimen exhibits a quadrate shape; 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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Pleurobema riddellii, Specimen #1479
One preserved mussel specimen including both the left and right valves. The specimen exhibits a triangular shape; white internal coloring; reddish-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:
Frierson, L. L.
Object Type:
Specimen
System:
The UNT Digital Library
Pleurobema riddellii, Specimen #1480
One preserved mussel specimen including both the left and right valves. The specimen exhibits a triangular 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:
Frierson, L. L.
Object Type:
Specimen
System:
The UNT Digital Library
Pleurobema riddellii, Specimen #1481
One preserved mussel specimen including both the left and right valves. The specimen exhibits a triangular shape; bluish-white internal coloring; dark brown external coloring; no external sculpturing. The specimen measures between 0 - 60 mm in length and was assessed to be long dead when collected.
Date:
unknown
Creator:
Frierson, L. L.
Object Type:
Specimen
System:
The UNT Digital Library
Quadrula houstonensis, Specimen #1483
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 60 - 100 mm in length and was assessed to be relatively-recently dead when collected.
Date:
unknown
Creator:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Quadrula houstonensis, Specimen #1484
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 relatively-recently dead when collected.
Date:
unknown
Creator:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Obovaria jacksoniana, Specimen #1485
One preserved mussel specimen including both the left and right valves. The specimen exhibits an oval shape; white internal coloring; green 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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library
Quincuncina mitchelli, Specimen #1487
One preserved mussel specimen including both the left and right valves. The specimen exhibits an elliptical 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:
unknown
Object Type:
Specimen
System:
The UNT Digital Library