Showing papers in "Aquatic Botany in 2007"

TL;DR: The predictable behavior of the three diatom ecological guilds along nutrient and disturbance gradients, and across major benthic habitats elucidates the functional value of different diatom growth morphologies in species–environment interactions and suggests a potential use in ecological assessments of human-impacted ecosystems.

TL;DR: It is concluded that hypersalinity probably does not solely cause seagrass dieoff events in Florida Bay, and high salinity can modify carbon and O2 balance in the plant, potentially affecting the long-term health of the seagRass community.

TL;DR: The influence of the amplitude of cyclic water level fluctuations on the growth of four species of emergent macrophyte, including Cyperus vaginatus, Phragmites australis, Triglochin procerum and Typha domingensis was studied in a controlled, pond-based experiment, indicating that a factor other than access to atmospheric carbon was restricting the growth.

TL;DR: The results suggest that despite the similar ecology, H. verticillata may outcompete E. densa in many situations, probably due to its higher plasticity.

TL;DR: Overall, the largest differences between clones were found in ontogeny, shoot morphology and leaf anatomy, and it was concluded that P.australisisa species with very high genetic variability is augmented by its cosmopolitan distribution, clonalgrowth form and the large variation in chromosome numbers.

TL;DR: In this paper, the authors argue that the reductions in water hyacinth on Lake Victoria were ultimately caused by the widespread and significant damage to plants by Neochetina spp., although this process was increased by the stormy weather associated with the El Nino event.

TL;DR: Results from an outdoor experiment demonstrate that introduced P. australis can have explosive growth over a single growing season, even when established from seed, and implies that management of young, newly established populations may be prudent where introducing P. Australis is considered undesirable.

TL;DR: In this article, the role of vegetation in the dissolution of dissolved Si from R australis stems has been quantified, showing that vegetation contributes to and enhances dissolved Si recycling capacity of tidal marshes: in a reeddominated small freshwater tidal marsh, more than 40% of DSi export was attributable to reed decomposition.

TL;DR: The results suggest that the fastest and most significant reduction in water hyacinth proliferation would be reached by lowering the water nutrient concentrations, and herbivory by E. catarinensis alone is not sufficient to reduce all aspects of water Hyacinth vigour, especially at very high nutrient concentrations.

TL;DR: In this paper, the authors used eddy covariance to measure the CO2 exchange and E-t by a California Tule marsh in 2003, and found that the mulch layer acted in a way analogous to an electrical diode that allowed the upward loss of heat from the water to the atmosphere at night, and shut off the flux from the atmosphere to the water during daytime.

TL;DR: Large-scale mesocosm experiment was conducted to investigate the effects of hypersalinity, porewater sulfide and nighttime water column hypoxia on the tropical seagrass Thalassia testudinum Banks ex Konig, finding stressor effects on growth, shoot survival, tissue sulfur and leaf quantum efficiencies.

TL;DR: In this paper, photosynthetic responses to desiccation at the level of individual leaf are insufficient to explain observed patterns of intertidal seagrass zonation.

TL;DR: Allelopathy was the most possible reason leading to the negative effect of U. pertusa on P. donghaiense, and the combined roles of allelopathy and nutrient competition were essential for the effect of G. lemaneiformis in the co-cultured dinoflagellate.

TL;DR: Carex species grouped by their seed viability, dormancy, and germination with a Seed Regeneration Index (SRI) had high seed viability (>60%) and required little to no stratification to germinate readily over a broad range of temperatures.

TL;DR: It is demonstrated that salinity may restrict the range of water regimes tolerated by aquatic plants and that at low salinities M. ericifolia seedlings are highly tolerant of sediment waterlogging, but are unlikely to tolerate prolonged submergence.

TL;DR: In this paper, the dependence of macrophyte parameters (distribution depth, width of the reed belt, density and length of shoots) on a number of abiotic factors (wind patterns, nutrient loading, slope of the littoral, granulometric sediment composition) in a large, shallow, and eutrophic Lake Vortsjarv (270 km 2, average depth 2.8 m) in Estonia in 1997 was investigated.

TL;DR: It is reported about successful winter survival of a tropical plant Pistia stratiotes in a natural thermal stream Topla in Slovenia in temperate climate zone in central Europe.

TL;DR: The study shows that eutrophication-related community shifts on rocky shores may occur very rapidly, regardless of the level of wave-energetic stress and the abundance of grazers, if the nutrient concentrations are high and the colonisation and growth of opportunistic algae are facilitated by disturbance such as (naturally or anthropogenically driven) canopy gap forming processes.

TL;DR: It is recommended that any future conservation plans for this species should be specifically designed to include those representative populations with the highest genetic variation for both in situ conservation and germplasm collection expeditions.

TL;DR: Results indicated that the total length of the roots can be regarded as a sensitive endpoint for the response of a macrophyte to 2,4-D, and stimulation of some of the endpoints (hormesis) was found for several of the species.

TL;DR: It is concluded that measurement of the drag experienced by plants is useful and may prove helpful in explaining the distribution of macrophytes in rivers.

TL;DR: Compared photosynthetic parameters derived from RLCs of Ulva sp.

TL;DR: Interviews with aquatic plant dealers indicate Malaysia is a major source of aquatic species for the trade in South Africa and major clusters of worldwide hydrilla almost identical to earlier RAPD studies with superior definition of the relationships between clusters.

TL;DR: It is reported that there is an apparent decline in sexual propagule production rates with increasing water depth, further highlighting the different morphological and reproductive acclimations of charophytes in shallow and deep water.

TL;DR: Of the 20 plant species of hydrophytes screened for Arbuscular Mycorrhizal (AM) fungal root colonization, 10 aquatic plants and five marshy plants were found to be mycorrhIZal, while the remaining species were non mycor rhizal.

TL;DR: Testing experimentally how seed buoyancy and seed submergence affect germination in four varzea tree species of the low-lying flood-levels concluded that contact with the river water did not disturb but on the contrary enhanced germinationIn the four studied species.

TL;DR: The seasonal dynamics of seagrass and epiphytic algal primary production were measured in an eelgrass bed in the Akkeshi-ko estuary, Hokkaido, Japan, and it is suggested that the change ofEpiphyte density and biomass was due to change of its loss rate, possibly due to herbivorous grazing rate.

TL;DR: This study was supported by the Consejeria de Industria y Medio Ambiente of Regional Gouvernment of Murcia.

TL;DR: It is concluded that Chara beds could be acting as nitrogen sinks in this ecosystem by extrapolating laboratory data to field situations and determining that approximately 38% of the N taken up by charophytes in Colgada Lake during the growth period is retained.

TL;DR: The common hydrological classification for mangroves developed by Watson [Watson, J.G., 1928] is not sufficient in mangrove areas with an irregular tidal regime and elevation, such as Can Gio in Vietnam as mentioned in this paper.