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 114 for “"Larval development"”.
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Post-larval development in deep-sea echinoderms
The post-larval phase is an essential period in the life history of marine invertebrates; vulnerable to high mortality, it ultimately influences the distribution and abundance of adult populations. The post metamorphic ontogenesis of thirty species of deep-sea echinoderms, belonging to three …
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The Effects of Neuroendocrine Stress on Larval Development
… on life history traits, such as reproduction and development. Furthermore, these phenotypic changes can affect larger-scale ecosystem dynamics, like nutrient cycling and disease epizootics. Animals are not equally susceptible to stressors across all stages of their life cycles. Critical windows of …
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The larval development of northern California Porcellanidae (Decapoda, Anomura)
… Of the five species only one has had its larval development described (Pachycheleas rudis). The purpose of the present study is to describe the remaining four species and to provide a key to the species level for the larvae of northern California Porcellanidae.
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Larval development and life history of Phyllaplysia taylori dall (Opistobranchiata: anaspidea)
… taxa. The taxonomic importance of embryonic or larval morphology has been limited only by the lack of detailed comparative morphological work on development. Fretter (1967) has shown that larval shell characteristics are reliable for taxonomic identification of some British prosobranchs. …
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LARVAL DEVELOPMENT AND MORPHOLOGY OF NORTH AMERICAN BURBOT (LOTA LOTA MACULOSA)
… setting. Throughout the first ten weeks of development larvae were sampled and photographed in order to measure various morphological features. Geometric and linear morphometrics were used to quantify body shape changes through development. Comparable samples were acquired from the Kootenai …
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Nutritional control of gene expression, larval development and physiology in fish
… This led to nutritional investigations with larval and juvenile fish highlighting the impacts of dietary ingredients on animal performance. Indeed, nutrition can be viewed as a central lever of action through which many aspects of the physiology and the environmental (water) quality of the …
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Larval development and feeding ecology of Hermissenda crassicornis (Eschscholtz) and Aeolidia papillosa (Linnaeus)
<p>Thompson (1967) defines three developmental types for Opisthobranchia with representative nudibranchs in each category. The types are: 1.) planktotrophic larvae which are obligatory plankton feeders prior to progressive metamorphosis, 2.) lecithotrophic larvae which may feed on the plankton, but …
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The larval development of Pinnixa Longpipes (Lockington, 1877) (Brachyura: Pinnotheridae), reared in the laboratory
… present paper reports in detail on the larval development of P. longpies as reared under laboratory conditions. These results are compared with previous descriptions of Pinnotherid larvae.</p>
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The plasticity of life histories during larval development and metamorphosis, using amphibians as study organisms.
The ability of animals to vary growth, development rate and behaviour in response to environmental conditions has been well documented, particularly during the larval phase in animals with complex life cycles. The evolution and maintenance of plasticity in response to environmental conditions is …
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Biochemical changes associated with embryonic and larval development in the American lobster Homarus americanus Milne Edwards
… and lipid varied in association with the larval molt cycle. Scant metabolic reserves were accumulated in premetamorphic larvae while large triacylglycerol reserves were stored in postmetamorphic (fourth stage) animals. Absolute levels of metabolic reserves limited the extent of their …
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Physiological IRE-1-XBP-1 and PEK-1 signaling in Caenorhabditis elegans larval development and immunity
… XBP-1 is sufficient to overcome PMK-1 dependent larval lethality on a lawn of pathogenic Pseudomonas aeruginosa. Further, we demonstrate that XBP-1 deficiency results in constitutive ER stress even in the absence of pathogenic infection. This elevated ER stress is reflected by increased …
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Biochemical changes associated with embryonic and larval development in the American lobster Homarus americanus Milne Edwards
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Biology, 1984.
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Alternative Processing of SREBP in Site 2 Protease and Scap Mutants During Larval Development in Drosophila Melanogaster
… acids which are required for rapid growth during larval development. I have demonstrated that processing of SREBP in Drosophila does not require the S2P or Scap, in contrast to the mammalian system. Flies lacking dS2P are viable and still process dSREBP. dS2P homozygotes were subviable, only …
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Alternative Processing of SREBP in Site 2 Protease and Scap Mutants During Larval Development in Drosophila Melanogaster
… acids which are required for rapid growth during larval development. I have demonstrated that processing of SREBP in Drosophila does not require the S2P or Scap, in contrast to the mammalian system. Flies lacking dS2P are viable and still process dSREBP. dS2P homozygotes were subviable, only …
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Xenobiotic monooxygenase activity and the response to inducers of cytochrome P-450 during embryonic and larval development in fish
… were measurable at all stages assayed. The developmental patterns of these two reductases were distinct from each other and did not closely correlate with that of BPM activity. However, the functional involvement of the NADPH-cytochrome c reductase in monooxygenase activity was indicated by …
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Effects of exposure to 17α-ethynylestradiol during larval development on the African clawed frog (Xenopus laevis) and the wood frog (Rana sylvatica)
… utilized in oral contraceptives, during the larval period on the sexual development, growth, metamorphosis, and transcriptional profiles of the African clawed frog (Xenopus laevis) and the wood frog (Rana sylvatica). To do so, X. laevis were exposed to 0.09, 0.84, or 8.81 µg EE2/L throughout …
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Studies on the reproduction and larval biology of Polydora Giardi Mesnil (Polychaeta: Spionidae)
There are no published accounts of larval development for P. giardi, although Mesnil (1896) determined his populations to be simultaneous hermaphrodites. The present paper describes aspects of the reproductive biology and larval development of P. girardi and presents descriptions and illustrations …
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Development of an embryo-larval chronic toxicity test using the sea urchins Tripneustes gratilla and Echinometra mathaei
… this aim, the influence of temperature on larval development to the 4-arm pluteus stage was first evaluated, to determine the duration of the toxicity test. Embryos of the sea urchins were exposed to three temperatures, namely 20, 23 and 26 °C, and development was documented at 24 h …
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