Topic
Uniola
About: Uniola is a research topic. Over the lifetime, 12 publications have been published within this topic receiving 110 citations.
Papers
TL;DR: Geographic and fine-scale population genetic structures of Uniola paniculata, the dominant coastal dune grass in the southeastern USA, were examined in this article, showing that the linear, naturally fragmented distribution of this native perennial was hypothesized to lead to high genetic structure and lower genetic diversity at the margin of the species range.
Abstract: Geographic and fine-scale population genetic structures of Uniola paniculata, the dominant coastal dune grass in the southeastern USA, were examined. The linear, naturally fragmented distribution of this native perennial was hypothesized to lead to high genetic structure and lower genetic diversity at the margin of the species range. The extensive ramet production and low seed germination of this species were also expected to cause populations to be dominated by a few large clones. At 20 sites throughout the range of the species, leaf tissue was collected from 48 individuals. Clonal structure was examined using leaf tissue collected from an additional 60 individuals, each in four patches at two sites. Starch gel electrophoresis was used to resolve 27 allozyme loci. The results indicated that Uniola had greater genetic structure (G(ST) = 0.304) than most other outcrossing species, indicating moderate barriers to gene flow. There was a weak but significant positive relationship between genetic distance and geographic distance, supporting an isolation-by-distance model of gene flow. There were no obvious disjunctions between regions. Genetic diversity (H(e)) was relatively uniform throughout most of the range of the species but was lower in all western Gulf of Mexico populations. Clonal diversity varied both within and among sites, but clones were often small, suggesting that sexual reproduction and recruitment from seeds are important factors maintaining genetic diversity.
55 citations
14 citations
Journal Article•
TL;DR: The only sizeable populations of Uniola paniculata (sea oats) on the Louisiana coast west of the Mississippi River delta were studied to determine if these populations were in a state of expansion or deterioration as mentioned in this paper.
Abstract: The only three sizeable populations of Uniola paniculata (sea oats) on the Louisiana coast west of the Mississippi River delta were studied to determine if these populations were in a state of expansion or deterioration. The populations have become established in areas with a mean water-table depth of 129 cm, which although shallow is sufficiently deep to alleviate any signs of water-logging stress. Soil nutrient concentrations and pH were generally lower inside the populations compared to adjacent unvegetated areas. Despite very low sand accretion within the populations (<0.1 m yr -1 ), vegetative lateral expansion (lateral spread) exceeded 1 m yr -1 during years with mild weather conditions, whereas years with severe overwash events resulted in a net loss of population area. The mean rate of lateral expansion of the populations over three years was 0.58 m yr -1 with the greatest mean migration being to the northwest (away from the eroding coast) at a rate of 0.85 m yr -1 . Since seed production rates in these populations are very low, colonization of new sites is extremely improbable and any population expansion is believed to be solely the result of vegetative lateral expansion. The extremely limited distribution of this species along the Louisiana coast is best explained by its reliance on vegetative reproduction, which although at rates comparable to areas where Uniola is dominant, is often not sufficient to keep pace with the rate of coastline retreat along the highly erosional, low elevation Louisiana coast.
14 citations
13 citations
TL;DR: A study was made to determine how artificial shade of several intensities affected establishment, growth, and chemical composition of the two grasses.
Abstract: Because of their ability to grow under tree canopies and to provide green herbage in winter, longleaf uniola (Uniola sessiliflora) and spike uniola (U. laxa) are important forage plants in the extensive loblolly-shortleaf pine-hardwood forest type of the South. As a matter of observation, the two grass species grow even under the densest tree cover and are rare or absent on well-lighted sites. In an effort to provide more specific information, a study was made to determine how artificial shade of several intensities affected establishment, growth, and chemical composition of the two grasses. Since measurements were made throughout the year, the research also provided data on seasonal aspects of the plants' growth.
10 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2017 | 1 |
| 2004 | 1 |
| 1991 | 1 |
| 1990 | 2 |
| 1982 | 1 |
| 1974 | 2 |