Browsing by Author "Calnan, T.R."
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Item Correlation of live mollusks with sediment and bathymetry on the Texas inner shelf.(1989) Calnan, T.R.; Littleton, T.G.; VeligerAn extensive survey of the macroinvertebrate populations of the Gulf of Mexico on the inner shelf of the Texas coast was initiated in 1976. The focus of this inventory was (1) the identification and enumeration of the macrofauna, (2) description of faunal communities, and (3) correlation of distribution and abundances, including sediment and faunal relationships. This report summarizes the mulluscan data from that survey. Although other inventories of mollusks on the inner shelf have been undertaken, this is the most extensive regional survey conducted on the Texas Gulf Coast. One hundred forty-one species of mollusks ( 82 Gastropods, 56 bivalves, and 3 scaphopods) were found in 554 benthic samples from stations located 1-11 miles (1.6-17.6 km) offshore from Sabine Pass to Brownsville, Texas. Both numbers of species and numbers of individuals of gastropods, bivalves, and scaphopods are greater on the South Texas inner shelf (Brownsville to Corpus Christi) than in areas northeast of Corpus Christi. Cluster analysis separated the fauna into three assemblages - a nearshore assemblage, characterized by sandy substrates, a transitional assemblage characterized by substrates of sandy mud, and an outer assemblage characterized by substrates of less sandy mud. All three are found on the inner shelf except in the Port Lavaca and Beaumont-Port Arthur areas. Faunal-sediment associations indicate that more molluscan species occur in sand than in mud, and the most abundant species are found where the sand fraction is high (80-100% sand). Analysis of the bathymetric distribution of mollusks shows that the mean number of species is highest in a depth range of 18-60 feet (6-18m). Many species are most abundant at either shallower-water stations (stations from 18.0-36.1 ft or 5.5-11.0 m deep) or deeper-water stations (stations from 47.9-60.0 ft or 14.6-18.3 m deep).Item Distribution of wetlands and benthic macroinvertebrates, submerged lands of Texas, Corpus Christi area(University of Texas at Austin, Bureau of Economic Geology, 1983) White, W.A.; Schmedes, K.E.; Calnan, T.R.; Kimble, R.S.; Littleton, T.G.; Hartmann, B.M.; Scranton, D.F.Item Distribution of wetlands and benthic macroinvertebrates, submerged lands of Texas, Galveston-Houston area(University of Texas at Austin, Bureau of Economic Geology, 1985) White, W.A.; Schmedes, K.E.; Calnan, T.R.; Kimble, R.S.; Littleton, T.G.; Hartmann, B.M.; Dillon, R.L.Item Distribution of wetlands and benthic macroinvertebrates, submerged lands of Texas, Port Lavaca area(University of Texas at Austin, Bureau of Economic Geology, 1989) White, W.A.; Kimble, R.S.; Calnan, T.R.; Littleton, T.G.; Hartmann, B.M.; Dillon, R.L.Item Evaluation of marsh creation and restoration projects and their potential for large-scale application, Galveston-Trinity Bay system(Bureau of Economic Geology, University of Texas at Austin: Texas: General Land Office, Coastal Division, 1998) White, W.A.; Calnan, T.R.; Morton, R.A.;This project used detailed field surveys to inventory and evaluate wetland restoration, enhancement, and creation projects in terms of their original design criteria, objectives, physical characteristics, hydrology, geomorphology, site stability, vegetation, and the potential for large-scale application. The objective was to evaluate and synthesize criteria considered important for the successful accomplishment of large-scale restoration and creation projects. Analyses of land surface profiles and vegetation characteristics indicate that the fill, and fill and shape sites had achieved densest foliar coverage with percentages ranging in the 60s. Scrape-down sites had percentages in the 40s. Frequently inundated organically-rich muds seemed to have the most potential for relatively rapid growth and development of vegetation.Item Fluvial-Estuarine Sedimentation, Texas Gulf Coast - Literature Synthesis(Bureau of Economic Geology, University of Texas at Austin, 1988) Calnan, T.R.; White, W.A.This report, which is a synthesis of published and unpublished data that focuses on fluvial-deltaic and estuarine sedimentation, and associated interactive processes, is part of a study funded by the Texas Parks and Wildlife Department and Texas Water Development Board with funds allocated by the Texas Legislature for comprehensive studies of the effects of freshwater inflows on the bays and estuaries of Texas. Another phase of this project involves field studies of the Trinity and Colorado River deltas to investigate, among other processes, current rates of sedimentation (aggradation) in deltaic marshes (White and Calnan, in preparation).Item Slide and poster presentation: Christmas Bay and Armand Bayou(Bureau of Economic Geology, 1990) Calnan, T.R.;Data, maps and photographs were used in compiling information for a poster and slide presentation on Christmas Bay and Armand Bayou. Base maps with drainage-basin boundaries for Christmas Bay and Armand Bayou were constructed from U.S.G.S. 7.5-minute quadrangle maps (table 1). The Texas Natural Resources and Information System (TNRIS) provided current photographs (March 1987 and October 1989) of both areas for supplementary information on current land use. The Armand Bayou Nature Center (ABNC) also provided slides of aerial photos of Armand Bayou. Several agencies, companies, and individuals were contacted in person, by phone, or by letter for data and information on both areas. These groups or individuals are listed in table 2, along with dates or approximate dates of contact, and the purpose of the contact. Naturalists at the ABNC were especially helpful in providing information and slides. Keys to the slides and posters and a list of references are included. The slide key and references provide necessary information for narrators of the slide presentation; the poster key is less crucial than the slide key because most posters are self-explanatory. Some of the slide information was not duplicated on the posters and vice versa. Posters have been mounted on 2' x 2' foam core board, and most posters have been laminated for increased durability. Word posters were computer-generated and could not be laminated, but they can be reproduced rapidly if they become damaged and duplicates are necessary. Hand-drafted posters were photoduplicated with a Canon laser color photoduplicator. The photoduplicated posters can not be laminated. Duplicates of each slide and poster are kept at the Bureau of Economic Geology.Item State submerged lands of Texas--sediments, geochemistry, benthic macroinvertebrates, and associated wetlands.(American Society of Civil Engineers., 1989) White, W.A.; Calnan, T.R.; Morton, R.A.; Kimble, R.S.; Littleton, T.G.; O.T. Magoon, and H. Converse; Coastal Zone '83: Proceedings of the Third Symposium on Coastal and Ocean Management. Volume IV. San Diego, California, June 1-4, 1983.No abstract availableItem Submerged lands of Texas, Beaumont-Port Arthur area: sediments, geochemistry, benthic macroinvertebrates, and associated wetlands. Special publication.(University of Texas at Austin, Bureau of Economic Geology., 1987) White, W.A.; Calnan, T.R.; Morton, R.A.; Kimble, R.S.; Littleton, T.G.; McGowen, J.H.; Nance, H.S.;No abstract availableItem Submerged lands of Texas, Galveston - Houston area: sediments, geochemistry, benthic macroinvertebrates, and associated wetlands(University of Texas at Austin, Bureau of Economic Geology, 1985) White, W.A.; Calnan, T.R.; Morton, R.A.; Kimble, R.S.; Littleton, T.G.; McGowen, J.H.; Nance, H.S.; Schmedes, K.E.;Surface sediment textures, sediment geochemistry, and benthic fauna of the State-owned submerged lands were mapped and described using bottom samples collected at 1-mi (1.6-km) intervals from bays, estuaries, and lagoons and from the inner continental shelf. In addition, the distribution of wetlands in adjacent areas was mapped using color-infrared photographs taken in 1979.