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Showing 1 to 20 of 35 for “"rotifers"”.
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Functional characterisation of LEA proteins from bdelloid rotifers
… microscopist Antony van Leewenhoek in bdelloid rotifers in 1702. Despite being studied for over three hundred years, our understanding of its molecular basis remains largely elusive. Recently, two group 3 LEA (late embryogenesis abundant) proteins, ArLEA1A and ArLEA1B, have been identified in …
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The vertical distribution and migration of planktonic rotifers in a hypereutrophic tarn
The planktonic rotifers of Priest Pot were studied from January 1983 to September 1984. Routine weekly samples from January 1983 to March 1984 provided a uniquely detailed data set giving information on the vertical distribution of the rotifer community in relation to the environmental conditions. …
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The relationship between rotifers, vitamin B12, and selected environmental parameters in Pandapas Pond, Virginia
… qualitatively analyzed during the same period. Rotifers were the most abundant zooplankton, Keratella cochlearis and Polyarthra vulgaris were the predominant rotifers. Seasonal densities of K. cochlearis and P. vulgaris followed uncombined vitamin Bl2 concentrations directly for the former and …
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SEASONAL VARIATION IN ROTIFER OCCUPANCY WITHIN FRULLANIA EBORACENSIS LOBULES: ILLUMINATING A SYMBIOTIC RELATIONSHIP BETWEEN TWO OVERLOOKED SPECIES
<p>Bdelloid rotifers are well documented as inhabitants within lobules of the widely distributed epiphytic liverwort, <em>Frullania eboracensis</em>. This research provides a detailed description of rotifer occupancy within lobules of <em>F. eboracensis</em> and tests the hypothesis that rotifer …
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Enrichment of rotifers (Branchionus plicatilis), Artemia nauplii and artificial dry feed with live yeast (Debaryomyces hansenii) for the growth of cultured dusky kob (Argyrosomus japonicus) larvae
… administered to larvae using live feeds, such as rotifers and Artemia, and formulated feeds. The dusky kob, Argryosomus japonicus, is emerging as a commercially viable marine aquaculture species in South Africa. However, commercial production of this species is being hindered by parasitic disease. …
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Food Habits and the Utilization of Drift Organisms by Larval Fishes in the Middle Fork of Drake's Creek, Kentucky
… were identified in the stomach analysis. Eggs, rotifers, hydracarina, and diptera represented the greatest component of the drift comprising 34%, 32%, 8%, and 6%, respectively. The major organisms observed in the gut analysis included eggs (fish, rotifer, and copepod species), rotifers …
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Microzooplankton Dynamics in Lower Chesapeake Bay and Its Major Tributaries
… study were mainly composed of copepod nauplii, rotifers, and ciliates. Ciliates were the most abundant microzooplankton, comprising more than 90% of the total density, with copepod nauplii representing approximately 50% of the total microzooplankton biomass (carbon content). Rotifers contributed …
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A STUDY OF THE MICROORGANISMS INHABITING ROTATING BIOLOGICAL CONTACTOR BIOFILMS DURING VARIOUS OPERATING CONDITIONS
… amoebae, ciliates, nematodes, and rotifers is complex and depends on the organic loading rate. Filaments found in initial biofilm studies were identical as Sphaerotilus in both morphological and ultrastructural characteristics. At high loading rates Gram-positive and Gram-negative …
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Effects of an herbicide on a planktonic food web
… ciliates, copepod nauplii, cladocerans and rotifers. Simazine decreased dissolved oxygen and pH, but increased nitrate and ammonia concentrations compared to control microcosms. A temporary decrease in temperature occurred at Week 1. Phytoplankton were differentially affected by simazine. …
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Zooplankton Dynamics in Wastewater Treatment High Rate Algal Ponds and development of effective control methods
… of zooplankton taxa including cladocerans and rotifers. The control of these zooplankton species is essential for the effective operation of HRAPs. This thesis research was aimed at designing cost-effective treatments to control zooplankton population densities applicable to full-scale HRAPs. …
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OVERLOOKED AND UNDERSTUDIED: A SURVEY OF THE SMALL AND HIDDEN FRESHWATER INVERTEBRATE TAXA (PHYLUM ROTIFERA AND SUBPHYLUM CRUSTACEA)
… dispersal, and fish parasites are no exception. Rotifers are among the most abundant zooplankters in lakes yet are often overlooked, and limited information is available on their seasonal and spatial distribution within the Laurentian Great Lakes. Herein, we present data on the seasonal …
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Reproductive Manipulation and Larval Rearing Techniques of Yellow Perch (Perca flavescens)
… reared in a recirculating system fed only live rotifers (T1), in a recirculating system fed live rotifers and an artificial diet (T2) and in a greenwater system (T3). Survival was low in all treatments. The specific growth rate did not differ among treatments over the first 6 days. The …
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Food Habits of Young-of-the-Year Fishes in Abbey Pond, South Dakota
… fed almost exclusively on chlamydomonads and rotifers. Larval bluegill utilized cladocerans, copepods, rotifers, and chlamydomonads as food. Analysis of species food habits did not indicate niche segregation. The degree of overlapping food habits existing in Abbey Pond may be an important …
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Preventive Measures in Aquaculture: Isolation, Application and Effects of Probiotics on Atlantic cod (Gadus morhua L.) Rearing at Early Stages
… probionts either applied to ova and larvae or to rotifers as the delivery vector to larvae. Further, virulence-related phenotypic traits, including haemolysin, siderophores and AHLs, were studied among bacterial isolates and related to larval survival. The results clearly demonstrate the influence …
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Distribution of Rotifera and Cladocera in a regulated river system
… During the period of peak rotifer abundance, rotifers were sampled along a longitudinal transect of Winfield pool and lower Marmet pool to determine longitudinal distribution. Cladocera were sampled with funnel traps at Marmet and Winfield Locks and Dams from lock wall, mid channel, and near …
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Controls over the distribution of soil micro-invertebrates in the McMurdo Dry Valleys, Antarctica
… indicate that Plectus spp., Eudorylaimus spp., rotifers, and tardigrades are positively associated with higher soil moisture and organic carbon, while Scottnema lindsayae prefers dry, nutrient-poor soils consistent with previous literature. Projected increases in soil moisture favor habitat …
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Molecular phylogenetics of the Metazoan clade Lophotrochozoa
… also suggest that the clade Platyzoa, including rotifers and platyhelminthes, may have arisen within the Lophotrochozoa, rather than as a sister group to lophotrochozoans. Chapter 4 investigates the Hox gene complement of the bryozoan Bugula turrita. Six Hox genes were recovered, including an …
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Factors influencing zooplankton communities in small freshwater lochs
… 26 were analysed for community composition; 675 Rotifers, Cladocerans and Copepods, of 68 species were identified. Zooplankton community structure and diversity were examined to determine relationships with nutrient status and to establish baseline data from which future monitoring may derive. …
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Incorporación de vitamina C en dietas larvarias y su implicación en el desarrollo de Solea senegalensis
… culture system used, allowed the replacement of rotifers during the first feeding stage of sole and enabled a nutritional study to be conducted. Ascorbyl palmitate is a source of vitamin C available for the first larval stages of sole. The nutritional study performed as part of this thesis …
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