water relations of seagrasses: stationary volumetric elastic modulus and osmotic pressure of the leaf cells of halophila ovalis, zostera capricorni, and posidonia australis.the stationary volumetric elastic modulus (epsilon(s)) of the leaf cells of three seagrasses (halophila ovalis ( hook, zostera capricorni aschers, and posidonia australis hook f.) was evaluated from estimates of epsilon(s) plus intracellular osmotic pressure (epsilon(s) + ii(i)) and ii(i). the estimates of (epsilon(s) + ii(i)) were made using a linear displacement transducer to measure very small changes in thickness of leaf tissue produced by changes in external osmotic pressure (ii(o)). ...198216662326
microsatellite primers for halophila ovalis and cross-amplification in h. minor (hydrocharitaceae).•premise of the study: polymorphic microsatellite primers were developed in the seagrass halophila ovalis to investigate genetic variation. •methods and results: ten polymorphic microsatellite loci were developed in halophila ovalis. the number of alleles per locus ranged from 2 to 12 across 80 h. ovalis individuals. these loci were successfully amplified in h. minor, and four were monomorphic across 30 individuals. •conclusions: these results from four h. ovalis populations and one h. minor pop ...201021622460
rhizobacterial population density and nitrogen fixation in seagrass community of gulf of mannar, india.seagrass rhizosphere generally supports high bacterial population density which plays a major role in determining the nutrient cycles of the sea. higher densities of total heterotrphic bacteria (26.3 x 10(6) cfu g(-1)), nitrogen fixing (27.3 x 10(3) cfug(-1), ammonifying (44.66 x 10(6) mpn g(-1)) and nitrifying bacteria (42.33 x 10(6) mpn g(-1)) have been registered in the seagrass areas than the non seagrass area. in particular, all these rhizosphere microbial population was higher in thalassia ...201223741797
dugong grazing and turtle cropping: grazing optimization in tropical seagrass systems?grazing by dugongs and cropping by green turtles have the capacity to alter the subsequent nutritional quality of seagrass regrowth. we examined the effects of simulated light and intensive grazing by dugongs and cropping by turtles on eight nutritionally relevant measures of seagrass chemical composition over two regrowth periods (short-term, 1-4 months; long-term, 11-13 months) at two seagrass communities (a mixed species community with zostera capricorni, halophila ovalis, halodule uninervis, ...200616821013
variation in biogeochemical parameters across intertidal seagrass meadows in the central great barrier reef region.this survey provides baseline information on sediment characteristics, porewater, adsorbed and plant tissue nutrients from intertidal coastal seagrass meadows in the central region of the great barrier reef world heritage area. data collected from 11 locations, representative of intertidal coastal seagrass beds across the region, indicated that the chemical environment was typical of other tropical intertidal areas. results using two different extraction methods highlight the need for caution wh ...200415757732
identification of the natural product 2,3,4,5-tetrabromo-1-methylpyrrole in pacific biota, passive samplers and seagrass from queensland, australia.halogenated natural products (hnps) are frequently detected in marine organisms. high hnp concentrations have previously been found in marine mammals from the great barrier reef, australia, including in the blubber of herbivorous dugongs (dugong dugon). to identify the source of hnps we initially focused on the analysis of australian seagrass (halophila ovalis) which serves as the principal food source for dugongs. gc/ms analysis of the seagrass indicated the presence of several organobromine co ...201121925687
Seagrass as a potential source of natural antioxidant and anti-inflammatory agents.Context: Halophila spp. is a strong medicine against malaria and skin diseases and is found to be very effective in early stages of leprosy. Seagrasses are nutraceutical in nature and therefore of importance as food supplements. Objective: The antibacterial, antioxidant, and anti-inflammatory activities of Halophila ovalis R. Br. Hooke (Hydrocharitaceae) methanol extract were investigated and the chemical constituents of purified fractions were analyzed. Materials and methods: Plant material ...201122129224
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