Showing papers in "Aquatic Botany in 1982"

TL;DR: Kinetin promotd glycolate metabolism in mature leaves of the three submersed plants during induced ageing, while ethrel and abscisic acid (ABA) showed an opposite effect.

TL;DR: In this paper, the authors developed a method for identifying exposure gradients, using wind data and fetch measurements, using Spearman rank correlation coefficients to determine the correlation between calculated exposure values, sediment characteristics and species distributions.

TL;DR: In this paper, the effects of aquatic macrophytes on various aspects of the stream microenvironment were observed and compared to conditions found in unvegetated substrate, including factors of micro-current velocity, substrate surface area, fine particle sediment deposition, detritus deposition and attached diatom availability.

TL;DR: A taxonomic revision of the genus Hydrilla (Hydrocharitaceae) is presented with a full description, diagnosis, synonyms with typifications, distribution maps and illustrations, also including information on ecology, floral biology, anatomy, embryology, chromosomes, genetics, variation and applied aspects with a rather extensive bibliography.

TL;DR: The translocation of nitrogen from the root—rhizome tissues to leaf tissues was more active during day than during night, suggesting involvement of a process(es) which is photosynthetically dependent.

TL;DR: Assessment of carbon flow in Caribbean seagrass meadows and coral reefs indicated that benthic algae and seagRasses together contribute at least 48–76% of the carbon found in fish from the former, shallow-water habitats.

TL;DR: The grazing activities of Bittium varium, which removes periphyton from seagrass blades, could have important implications for the distribution and abundance of Zostera marina in the Chesapeake Bay.

TL;DR: A general seasonal variation pattern of heavy metal concentrations in above and below-ground parts of eelgrass was observed, and maximum concentrations were encountered in late winter—early spring and minium concentrations in the autumn.

TL;DR: The patterns of style morph distribution suggest Amazonia as the centre of origin of E. crassipes, with natural spread from there to other areas of the South American continent and introduction by man to North and Central America and the Caribbean.

TL;DR: In this article, the authors examined the interaction between seagrasses and sediment dynamics on a flood-tidal delta of a coastal lagoon in southern Rhode Island from 1978 to 1980.

TL;DR: In this paper, the authors found that the feeding activities of gammaridean amphipods were responsible for removing surface fouling material in eelgrass leaves, which may lead to enhanced photosynthetic rates of seagrasses in the field.

TL;DR: In this article, the authors evaluated the uptake of hydrilla verticillata (L.f.) Royle from sediment versus overlying water in relation to the K demands incurred by this species during an 8-week period of growth.

TL;DR: Partitioning of Ruppia into plant parts reveals differences between annual and perennial forms as well as seasonal differences within each life cycle.

TL;DR: Results indicate that uptake is an active process with preference for ammonia over nitrate, and the role of duckweed in direct conversion of ammonia into plant protein as an abridgement of the nitrogen cycle is discussed.

TL;DR: The primary production of Enteromorpha compressa (L.) Grev varied between 0.02 and 10.8 mg C g dry wt.−1 h−1, with a total daily production amounting to ca. 47 mg Cg dry Wt−1 day−1.

TL;DR: Taxonomic and ecological investigations of the annual and perennial forms revealed both species differences and phenotypic variation within species, and comparative studies of the reproductive biology, life history and physiological requirements and tolerances emphasized the distinctions between the two life forms.

TL;DR: Photosynthetic responses to light and pressure were measured for two seagrass species abundant in the Gulf of Eilat (Red Sea) and it appears that pressure rather than light is one of the factors limiting the depth penetration of this species.

TL;DR: A survey of the germination capacity of the seeds of these Zannichellia taxa from several European localities is presented, finding that the optimum temperatures for germination were lower under various chlorinity conditions, with the lowest optimum temperature in the dark.

TL;DR: Chance abiotic factors appeared to govern the observed year-to-year variations in the intertidal macrophyte community of Zostera japonica and Ruppia maritima.

TL;DR: Taxonomic decisions presented in this study of Vallisneria are founded on the consistency of comparable staminate and pistillate floral structures considering the geography and dioecious nature of the genus.

TL;DR: It is concluded that in aquatic, particularly submerged macrophyte communities, the processes of detritus production and utilization cannot be considered in isolation from the preceding process of senescence.

TL;DR: The data suggest that the photorespiration-reducing mechanism in Myriophyllum increases the apparent affinity of the photosynthetic process for CO 2 .

TL;DR: Under intertidal conditions in summer but with a high relative humidity in the air, the two species grew at equal rates, confirming the idea that low resistance to desiccation limits the upward penetration of Z. marina into the intert tidal zone.

TL;DR: In this article, a factorial experimental design was used to determine which of several factors influence Myriophyllum spicatum L. vegetative colonization success and the relationship between total nonstructural carbohydrate (TNC) content, a measure of propagule vigor, and propagule success.

TL;DR: It is concluded that Ruppia is best placed in the family Potamogetonaceae, and two species are recognised in Australia, R. maritima L., R. tuberosa Davis and Tomlinson and R. polycarpa R. Mason.

TL;DR: The distribution of three Zannichellia taxa is discussed in relation to environmental factors such as chlorinity, size of the habitat, desiccation, water depth, water circulation and climatic conditions.

TL;DR: The biomass and net productivity of leaves of Zostera capricorni Aschers were measured in an estuary near Sydney, New South Wales, at various times during the period 1976-1979.

TL;DR: Benthic vegetation patterns and sea urchin abundances, feeding and reproductive activities are described along a gradient from shallow lagoons to depths of 8 m, and diversity and community structure appear to be controlled more by light and competition than by grazing.

TL;DR: Photosynthesis in Potamogeton pectinatus L. and Zostera marina L. was inhibited by 650 μg 1 −1 of dissolved atrazine, but was stimulated by 75 μg 1-1, while in Vallisneria americana Michx inhibition was significant at the higher concentration but minor at the lower concentration.

TL;DR: A taxonomic revision of the genus Hydrocharis (Hydrocharitaceae) is presented with full descriptions, diagnoses, synonyms with typifications, distribution maps and illustrations and including information on ecology, floral biology, anatomy, embryology, chromosomes and variation with a rather extensive bibliography.