Showing papers in "Aquatic Botany in 1997"

TL;DR: It was concluded that in stagnant water bodies the present water table management enforces the effects of eutrophication on the reed die-back, and local disturbances, such as the mechanical mowing, of reeds may enhance reedDie-back.

TL;DR: In this paper, a review of the algorithms used to describe these relationships are reviewed, with emphasis placed on aquatic plants in freshwater ecosystems, and the robustness of macrophyte simulation models is largely dependent on the rigour with which they are calibrated and verified against natural data representing a broad range of environmental conditions.

TL;DR: The field salinity tolerance of Phragmites australis was evaluated by investigating 27 natural reed habitats along the eastern and western coasts of Jutland, Denmark, finding that it adapted to saline conditions by adjusting the level of osmotically active solutes in its leaves.

TL;DR: The data suggest that macrophyte species composition can alter sediment biogeochemistry resulting in varying porewater phosphate and solid-phase phosphorus and metal levels.

TL;DR: In this article, the relationship between the NDVI and leaf area index (LAI) was modelled for mangroves growing on the Caicos Bank, Turks and Cayes Islands, and a thematic map of LAI was produced from satellite data for the whole Bank.

TL;DR: The structural categories of typical flowering plants are transcended in the Podostemaceae due to developmental changes and saltational evolution.

TL;DR: The horizontal rhizome method is a successful, minimum-impact technique for large scale eelgrass transplanting efforts in a northern New England cold water environment.

TL;DR: The effects of pH changes on photosynthesis in three Mediterranean seagrass species were assessed by combining laboratory experiments with field records of pH, and the response of photosynthesis to increasing pH was examined under laboratory conditions.

TL;DR: The hypothesis that epiphyte biomass is primarily controlled by seasonal changes in seagrass shoot size and hence ultimately by the solar cycle and secondarily by local environmental changes, among which herbivory seems the most important, is supported.

TL;DR: The hypothesis that actively-growing macroalgal mats efficiently sequester benthic nutrient inputs to the overlying water and reduce nutrient availability to a level that may limit pelagic production is supported.

TL;DR: The lack of changes in shoot productivity and limited production of rhizome meristems in T. testudinum result in slow regrowth in propeller cuts, and the management implication is that turtle grass meadows will show long-term damage from propeller scars if not protected.

TL;DR: Because amphipods are highly mobile with rapid production rates their impact on epiphytes may be important, particularly in affecting species composition rather than biomass, however, spatial and temporal patchiness in abundance may also play a role in determining the relative effectiveness of these two types of grazers.

TL;DR: It was found that HCO 3 − was used as a major source of inorganic carbon at the normal seawater-pH of 8.2, and that bulk CO 2 contributed only marginally to photosynthesis at the pH, but an inhibitor of extracellular carbonic anhydrase affected photosynthetic rates more than did the less specific ATPase inhibitors.

TL;DR: In this paper, the authors used three Landsat TM images of coastal North Carolina for the detection of seagrass meadows and reported agreement of the Landsat classification with reference data was as high as 72.6% for a June 1992 image.

TL;DR: In this paper, the authors assume that the knowledge of the historical trends in vegetation mapping concepts may provide useful insights for improving the Remote Sensing (RS) and Geographic Information System (GIS) approach of vegetation.

TL;DR: Comparison of the concentrations in healthy leaves and leaves infected with Labyrinthula zosterae Porter and Muehlstein showed a sharp increase of especially caffeic acid in infected leaves, suggesting that caffeic Acid influences the growth of Labyrinthula.

TL;DR: In this article, the suitability of using aerial photographs interpreted at a resolution of 1:24 000 when examining temporal change in seagrass cover in Tampa Bay, FL, a subtropical estuary was examined.

TL;DR: In this article, a cost-effective method of estimating basal area coverage of submersed vegetation that uses differential global positioning system data linked to underwater video images of the bottom is presented.

TL;DR: In this article, vegetation and soil phosphorus concentrations along four transects in areas representative of varying environmental conditions within the Everglades region were found to be correlated with nutrient input sources associated with agricultural runoff.

TL;DR: In this paper, the authors developed and analyzed buffer zones for a portion of the Iowa River basin using Landsat Thematic Mapper (TM) data to characterize the land cover for the study area and integrated the buffer zones with the remotely sensed classification data to identify critical areas for the establishment of riparian vegetation strips.

TL;DR: In this article, the authors measured monthly for two years in a subtidal meadow subjected to moderate tidal amplitude in the San Juan Islands, WA, USA, and measured major physical and chemical factors (e.g., nutrient concentrations, light, and temperature) concurrently.

TL;DR: Re-mobilization and subsequent allocation of nitrogen from old plant tissues seem to be an important way to reduce the demand for external nitrogen in Amphibolis and, therefore, this seagrass seems well adapted to sustain rapid growth in nutrient-poor environments.

TL;DR: In this article, spatial change in eelgrass meadows, Zostera marina L, was assessed between 1978 and 1987 and between 1987 and 1995 at Izembek Lagoon, Alaska.

TL;DR: Comparisons of the metabolic rates and critical light requirements of P. sinuosa between summer and winter suggest that ambient environmental conditions rather than seasonal changes in physiology are primarily responsible for the seasonal differences in growth rates that occur in the field.

TL;DR: Interspecific competition between Purple loosestrife and broad-leaved cattail was examined using a replacement series design, and an input/output ratio analysis of biomass production suggests local extinction of T. latifolia during competition with L. salicaria.

TL;DR: A mathematical model incorporating a thermal inactivation equilibrium of an essential enzyme as a controlling factor of the modelled rates successfully fitted all large data sets, showing that thermal in activation is a mechanistic description consistent with the observed patterns in irradiance-saturated photosynthesis and dark respiration.

TL;DR: Primary production of Posidonia oceanica meadows was estimated at two sites in the Mediterranean basin (Marseilles, France and Ischia, Italy), in the 10 to 20 metre depth range, and the fate of stocks and the flux of elements resulting from primary production were determined.

TL;DR: Phosphorus rather than nitrogen was the important macro-nutrient limiting R. mangle leaf area, and root and leaf biomass development in the mesocosm experiment, without hypersalinity stress.