Bog Research

Columbia, LA, United States

Bog Research

Columbia, LA, United States

Time filter

Source Type

Reid C.S.,000 Quail Drive | Faulkner P.L.,000 Quail Drive | MacRoberts M.H.,Bog Research | MacRoberts M.H.,Louisiana State University in Shreveport | And 3 more authors.
Journal of the Botanical Research Institute of Texas | Year: 2010

Saline prairies are unique, small-scale grassland communities found in The south-central United States. These grasslands occur on natric soils, which have high levels of exchangeable sodium, resulting in adverse physical properties including poor internal drainage and aeration. Subsurface name horizons can contribute to harsh droughtiness. Landscape features within our study sues included broad flats, slicks, wet depressions, and pimple mounds. The flora of two study sites totaled 219 species and mfraspecific taxa distributed among 148 genera and 65 families. Largest families were Poaceae, Cyperaceae, and Asteraceae with 39,22, and 20 species, respectively Exotic species totaled 17 (7.8%) and species rare at the stateor global level totaled 20 (9 1%). Gcocarpon minimum, which is federally-listed as threatened, was present at both study sites and was very abundant at one site. Our survey resulted in the discovery of two state records (Lechea san-sabeana and Saxifraga texanri) and rediscovery in Louisiana of three taxa(Carex arkatuana, Cratiolaflava, and Minuartia drum-mondii). Soil pedon descriptions and chemical analyses confirmed the natric soil classification. Particle size analysis indicated that pimple mound soils were sandier than soils of other landscape positions, which were predominantly silty. Concentrations of Ca, Mg, and Na were elevated in broad flat and slick soils versus pimple mound soils. Surface horizons were mostly acidic with low sodium adsorption ratios (SAR) for most soil cores. Natric horizons were characterized by alkaline pH and SAR values often well above 15, and ranged in depth from 0 to 48 cm. We qualitatively relate flora to edaphic characteristics of each landscape position. Saline prairies at our study sites appear to be edaphically maintained as grasslands. We briefly discuss community classification in light of soils evidence.


MacRoberts B.R.,Bog Research | MacRoberts B.R.,Louisiana State University in Shreveport | MacRoberts M.H.,Bog Research | MacRoberts M.H.,Louisiana State University in Shreveport | And 2 more authors.
Journal of the Botanical Research Institute of Texas | Year: 2012

The vascular flora of Caddo Parish, Louisiana, is updated. Field and herbarium research has yielded 18 species new to the parish. The total parish count is now 1441 species, of which 16.8% are non-natives.


Brown L.E.,Spring Branch Science Center Herbarium | MacRoberts B.R.,Bog Research | MacRoberts B.R.,Louisiana State University in Shreveport | MacRoberts M.H.,Bog Research | And 4 more authors.
Journal of the Botanical Research Institute of Texas | Year: 2010

An annotated, vouchered checklist is provided of the vascular plant taxa of the Jack Gore Baygall and Neches Bottom Units of the Big Thicket National Preserve in Tyler, Jasper, and Hardin counties, Texas. Together they total 5,379 hectares. Documented for the units are 739 taxa (but only 734 species due to multiple varieties in some native species), of which 89 taxa (12.1%) are exotics.


MacRoberts B.R.,Bog Research | MacRoberts B.R.,Louisiana State University in Shreveport | MacRoberts M.H.,Bog Research | MacRoberts M.H.,Louisiana State University in Shreveport | Witsell C.T.,Arkansas Natural Heritage Commission
Journal of the Botanical Research Institute of Texas | Year: 2011

We describe the small-scale (0.0001,0.001,0.1 ha.) species richness and soils of blackland prairies in southwestern Arkansas. Areas sampled were Saratoga Blackland Prairie Natural Area, Rick Evans Grandview Prairie Wildlife Management Area, and Terre Noire Natural Area. Four 0.1 ha plots had 134 species and averaged 64.8 species, eight 0.001 ha plots averaged 22.1 species, and eight 0.0001 ha plots averaged 14.5 species. The most diverse families were Asteraceae (37 species), Poaceae (23 species), and Fabaceae (11 species). The soils are predominantly alkaline high-calcium silty clay loams. The soils are similar to those of other blackland/isolated prairies in the southeast except for their higher calcium levels. Ninety-eight percent of the species were native. The occurrence of only three exotic species in the plots indicates that these sites are in very good condition.


MacRoberts M.H.,Louisiana State University in Shreveport | MacRoberts M.H.,Bog Research | MacRoberts B.R.,Louisiana State University in Shreveport | MacRoberts B.R.,Bog Research
Journal of the American Society for Information Science and Technology | Year: 2010

To determine influences on the production of a scientific article, the content of the article must be studied. We examined articles in biogeography and found that most of the influence is not cited, specific types of articles that are influential are cited while other types of that also are influential are not cited, and work that is "uncited" and "seldom cited" is used extensively. As a result, evaluative citation analysis should take uncited work into account.

Loading Bog Research collaborators
Loading Bog Research collaborators