Showing papers in "Aquatic Botany in 1987"

TL;DR: The relationship between light regime, photosynthesis, growth and depth distribution of a temperate seagrass, Zostera marina L. (eelgrass), was investigated in a subtidal eelgrass meadow near Woods Hole, MA as discussed by the authors.

TL;DR: Experimental mesocosms used to grow Eelgrass in substrata of varied nitrogen composition showed the dramatic effect of insufficient nitrogen on eelgrass growth, abundance and leaf morphology, demonstrating the supposition that nitrogen is limiting in terrigenous environments.

TL;DR: Preliminary laboratory studies suggest that currents between 2 and 50 cm s−1 affect leaf production of Zostera marina L. under light-saturated conditions and canopy modification of flow structure and light capture efficiency by the deflected canopy should be examined.

TL;DR: The effect of temperature on the photosynthesis and growth of seagrasses may be summarized by considering the ways in which temperature alters the characteristics of the photosynthetic-irradiance (P-I) curve of segerasses.

TL;DR: The composition and productivity of two mangrove sites surrounding the Laguna de Terminos, Mexico, were studied from March 1979 to January 1984, and measurements were made of the tree composition, above-ground woody biomass changes, and litterfall production at a high-salinity fringing site and a low-saliency riverine site.

TL;DR: Flowering and seed-bank development of annual Zostera marina L. and perennial Z. noltii hornem were studied in the Zandkreek and actual seed densities of Z.noltii were much lower than predicted on the basis of the amount of inflorescences.

TL;DR: The greatest decline of seagrass beds that is known is certainly the almost simultaneous breakdown of the North Atlantic populations of Zostera marina L, due to the "wasting disease" as discussed by the authors.

TL;DR: Differences in epiphyton composition were larger between the closely related species Chara tomentosa L. and C. globularis Thuill than between Charatomentosa and Nitellopsis obtusa (Desv.) J. Groves.

TL;DR: Different types of nutrient limitation between two frondose and one calcareous macroalga suggest that algal community structure in tropical marine systems may be mediated by different resource limitations that are imposed on different populations within the community.

TL;DR: From May to October 1983, seasonal dynamics and leaf growth of Zostera noltii Hornem, were studied in three permanent quadrats in the Zandkreek (SW Netherlands) and it was hypothesized that mutuality is the cause of this difference in timing.

TL;DR: The resource allocation of Potamogeton pectinatus seems to be strongly influenced by environmental factors, which is discussed in relation to current reproductive strategy concepts.

TL;DR: A schematic model describing the diffusive transport of oxygen in the Egeria lacunar system is developed and it is shown that simple gas-phase diffusion down a gradient of 5.49 × 10 −2 cm 3 O 2 cm −3 m −1 is sufficient to account for the oxygen transport rates in the experimental material.

TL;DR: In this paper, seven identical small-scale ecosystems, simulating hydrologically isolated lentic soft waters, were exposed to different artificial rain solutions during a 2-year period.

TL;DR: Evidence is given that this seagrass can tolerate high light intensities without damage to its pigment pool and the special adaptive photosynthetic performance of Z. noltii can be supported by a C 4 -type metabolism.

TL;DR: The upper distribution limit of annual eelgrass is likely determined by desiccation while the lower limit is probably determined by a combination of light availability (to some extent affected by perennial eel Grass) and exposure to spring rains which would significantly enhance seed germination.

TL;DR: In this paper, 14 species of seagrass have been found on the northwest Australian coast from 24°S to 12°S, from Papua New Guinea and the Torres Straits.

TL;DR: Morpho-anatomical studies of short-shoots of Thalassia testudinum Banks ex Konig collected in Tampa Bay, Florida from February 1979 to October 1980 demonstrated the presence of sexually reproductive short-shoot during all months, except August and September, which suggests possible genetic diversity and aseasonality for floral induction.

TL;DR: All species reached the maximum production during February and March, when the water temperatures were highest and water was retained above all sites, at all times.

TL;DR: Higher photosynthetic responses in plantscollected from both sites in December support the suggestion of continued growth, and photoinhibition occurred at higher photon flux densities than in the estuarine population.

TL;DR: Results indicate that damselfish feed primarily on their algal lawns and graze the algae present in proportion to abundance, and non-selective feeding by Stegastes planifrons within their territorial lawns appears to result in an “intermediate disturbance” which maintains a greater algal species richness than is found in their absence.

TL;DR: The plastochrone interval of the rhizomes (PIR) was determined in the monopodially branching seagrasses and the pattern of proliferative and reiterative branching in the Cymodoceoideae is illustrated by an image of 123 days of growth in the fastest growing specimen.

TL;DR: In this paper, the evapotranspiration of Eichhornia crassipes (Mart.) Solms and Typha latifolia L. growing in 5.77m 2 tanks and evaporation (E 0 ) from control tanks were measured over a 6-month period at Auburn, Alabama (32.5° N latitude).

TL;DR: In this paper, the authors examined differences in macrophyte community composition in a chronosequence of spatially separated dune ponds near the south shore of Lake Michigan and related to environmental variables.

TL;DR: A new method for estimating the rate of photosynthetic fixation of carbon in seagrasses is described, which is sensitive and simple to apply and based on the close relationship between photosynthesis rate and the volume of gas discharged through the lacunae.

TL;DR: The changes in chlorophyll a : b and carotenoid:ratio chlorophyLL a suggest that synthesis/degradation of these pigments is tightly coupled and that short photoperiods may initiate senescence in P. pectinatus.

TL;DR: A regulatory role for endogenous ABA content, possibly mediated by emergence-induced water stress, in the control of aerial leaf development in Hippuris is suggested.

TL;DR: Both populations showed distinct seasonal variations in biomass and growth rates, with maxima in late summer-early autumn and minima in winter, and the main differences were a more compact growth form and higher growth rates and turnover rates of primary laterals in the intertidal population.

TL;DR: In this article, changes in macrophyte species composition and biomass dynamics were monitored in four marsh plant communities within the Okefenokee Swamp, located in southeastern Georgia and northeastern Florida, U.S.A.

TL;DR: In this paper, the authors showed that the first 12 hours after transplanting the moss rhynchostegium riparioides (Herw.) C. Jens showed that Zn uptake over the first twelve hours was twice as fast as loss and reached an asymptotic value sooner.

TL;DR: Thalassia hemprichii was the most productive seagrass, whereas the lowest mean relative production was observed for Syringodium isoetifolium, and the plastochrone interval of the leaves was constant in all species and the mean ranged from 10.1 to 11.1 days.