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Title: Habitat development field investigations, Bolivar Peninsula marsh and upland habitat development site, Galveston Bay, Texas. Appendix B, Baseline inventory of terrestrial flora, fauna, and sediment chemistry
Authors: Dodd, J. D. (Jimmie Dale), 1931-
Herlocker, Dennis J.
Cain, Brian W.
Lee, B. J.
Hossner, L. R.
Lindau, C.
Keywords: Wildlife habitat improvement--Texas--Bolivar Peninsula
Bolivar Peninsula (Tex.)
Salt marshes--Texas--Galveston Bay
Galveston Bay (Tex.)
Coastal sediments--Evaluation
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (Dredged Material Research Program (U.S.)) ; no. D-78-15; Appendix B
Abstract: This study involved collection of flora, fauna, and sediment chemistry baseline data prior to habitat development with dredged material. The specific purposes were to (a) survey and evaluate pertinent historical data and literature; (b) inventory vegetation and prepare a vegetation map; (c) inventory avian, mammal, and macroinvertebrate populations; and (d) determine specific soil chemical properties. A total of 74 plant species representing 61 genera and 20 families were present at the study site. The dominant grasses were Spartina patens (marshay) and Andropogon spp. (bluestem). Forb density was over 435,000 plants/acre with Heterotheca subaxillaris (camphorweed) the most common. The Compositae contributed the greatest number of species. A woody plant density of over 3,250 plants/acre occurred. The dominant was Sesbania drummondii (drumond sesbania). The only other woody species that occurred was Croton punctatus (gulf croton). Standing crop biomass production on the study site exceeded 3,000 pounds/acre. The following six major plant communities were mapped, in order area occupied: (a) Andropogon peranguscatus, (b) Spartina patens, (c) Sesbania-mixed grass, (d) Sporobolus virginicus-Distichlis spicata, (e) Monarda citriodora, and (f) Spartina alterniflora. A total of 98 bird species were identified, with red-winged blackbirds the most numerous species. Thirteen mammal species were recorded, 3 of them domestic. The most common were hispid cotton rat, raccoon, and domestic goat. A total of 31 individuals representing 11 species of reptiles and amphibians were observed. Eighteen orders of macroinvertebrates were collected and identified. Soil and sediment samples were sandy in texture to a depth of 107 cm. Total organic carbon was generally less than 0.2 percent. Extractable ammonium and extractable orthophosphate varied but were present in low quantities. Values of Eh varied from +500 mv for oxidized horizons to near -240 mv in the intertidal area. The pH values of the sediments ranged from 7.00 to 8.50. Interstitial water did not contain excessive concentrations of ammonium-, nitrite- or nitrate-nitrogen. Total inorganic nitrogen never exceeded 6.14 mg/ℓ. Total phosphorus and orthophosphate concentrations were less than 3.25 and 0.625 mg/ℓ, respectively. Total dissolved carbon ranged between 2.0 and 9.55 mg/ℓ. Excessive nutrient concentrations were not found in this series of core samples. Metal concentrations of lowland interstitial water were similar to those interstitial water values from the profiles located in the intermediate areas. Magnesium, potassium, sodium, and calcium concentrations for interstitial water from the lowland areas were high compared to those for the intermediate sites. Heavy metal concentrations (iron, manganese, zinc, copper, lead, cadmium, and mercury) were low.
Description: Technical Report
Gov't Doc #: Technical Report D-78-15; Appendix B
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Technical Report

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