Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 589 for “"Invertebrates"”.
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Reproductive success in Antarctic marine invertebrates
… the early stages of species loss.<br/><br/>Some invertebrates are highly abundant in shallow water sites around the Antarctic and form conspicuous members of the Antarctic benthos. Three common echinoderms and one nemertean were sampled from sites adjacent to the British Antarctic Survey’s …
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Paleoecology of some upper Pennsylvanian benthic invertebrates
Digitized by Kansas Correctional Industries
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Biogeographical patterns of southern African marine invertebrates
Biogeography is defined as the study of life, in a spatial and temporal context, with respect to the analysis and explanation of patterns for a given area. The tendency for species richness and diversity to increases towards the equator, where both peak, is a much debated and tested pattern. …
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Early life-history ecology of Arctic benthic invertebrates
… the Arctic Ocean and Woods Hole, MA. Many marine invertebrates have a biphasic life-history, with larvae that disperse in the water column then settle to the seafloor. Extreme population bottlenecks occur at larval and juvenile stages, which fundamentally alter adult communities. Yet, marine early …
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Isolation of novel antibiotic producing microorganisms from invertebrates
… were to investigate terrestrial and aquatic invertebrates as a source of antibiotic producing microorganisms, to isolate the organisms and screen them for activity against Gram-positive and Gram-negative bacteria. Those with activity would be further characterised. Forty-seven antibiotic …
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The Effects of Ultraviolet-B Radiation on Aquatic Invertebrates
… study was to assess the sensitivity of aquatic invertebrates to UV-B radiation. Solar simulators were used to expose five species of aquatic invertebrates to enhance levels of UV-B radiation. The simulators were calibrated to match local ambient solar radiation. UV-B measurements in a eutrophic …
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New cytotoxic natural products from North-Eastern Pacific marine invertebrates
… into the chemistry of four species of marine invertebrates which were found to produce cytotoxic crude extracts (ED50 against the L1210 murine leukemia cell line 5 30 pg/mL) led to the isolation of nine new and eleven previously known secondary metabolites. The structures of the novel …
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Effects of Rodeo Herbicide on Aquatic Invertebrates and Fathead Minnows
… effects on nontarget organisms such as aquatic invertebrates that are important as a food source for waterfowl. The objectives of this study were to evaluate the effects of Rodeo on the survival of aquatic invertebrates in wetlands, and to determine in the laboratory the acute toxicity of Rodeo …
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The echinoid Parechinus angulosus and its association with other invertebrates
Echinoids are recognized as important components of temperate kelp forests because of the impact that they have by grazing. The provision of shelter by some echinoid species for both juvenile conspecifics and for other species of echinoids has been widely documented. The behaviour is thought to be …
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Exploring circadian rhythms, food intake, and their interactions in marine invertebrates
… while there are major knowledge gaps for marine invertebrates. My dissertation focuses on the interactions of circadian rhythms and metabolism in three marine invertebrate systems using a combination of behavioral, molecular, and bioinformatic approaches. In Chapter 2, to understand how sensory …
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The Effects of Three Rodenticides on Nontarget Small Mammals and Invertebrates
Mortality of non-target small mammals and invertebrates using 3 rodenticide treatments (pre-baited zinc phosphide, pre-baited strychnine, and strychnine alone) was evaluated in western South Dakota. Rodenticides were applied September 22-24, 1983 on 15 black-tailed prairie dog (Cynomys …
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Dynamic lighting and its impact on the behaviour of marine invertebrates
… detection and behaviour of three marine invertebrates, the common cuttlefish *Sepia officinalis*, the shore crab *Carcinus maenas*, and the brown shrimp *Crangon crangon*. In Chapter 2, I investigated whether caustics impaired the hunting success of cuttlefish. By exposing cuttlefish to …
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An Evaluation of downland turf re-creation, using invertebrates as indicators.
… fields, by collecting vegetation data, and using invertebrates as indicators of habitat quality. The recreated downland sites were re-seeded 1 to 3 years before the study. The new habitat was influenced by adjacent established downland and calcicolous species were found colonising the: edges of …
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Exploring circadian rhythms, food intake, and their interactions in marine invertebrates
… while there are major knowledge gaps for marine invertebrates. My dissertation focuses on the interactions of circadian rhythms and metabolism in three marine invertebrate systems using a combination of behavioral, molecular, and bioinformatic approaches. In Chapter 2, to understand how sensory …
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Transport and retention of benthic marine invertebrates in the Southern Tauranga Basin
Dispersal is the process in which individuals are transferred between populations, and is essential for population sustainability and longevity. In estuarine soft sediment communities, dispersal often occurs as the interaction between the individual and tidal flows. Many coastal benthic marine …
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