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 13 of 13 for “"parasite abundance"”.
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Parasite abundance in Atlantic cod (Gadus morhua) in shallow and deep waters around Iceland
… by molecular sequencing but here I show that parasites as biological tags might be a useful method in cod ecotype identification since results indicate that there is variation in parasite infection between the coastal and frontal types. I found that certain groups of parasites like copepods, …
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Temporal and spatial variability in 'Tetracotyle' type and metacercariae infection in the South African sardine, Sardinops sagax
… examined to elucidate the potential use of this parasite as a biological tag, and to test the hypothesis that the sardine population is divided into discrete western and southern subpopulations or stocks. Adult S. sagax specimens of 15 to 22 cm caudal length were collected monthly from five …
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The influence of an umbelliferous understory on the parasites of organic apple orchards in Canterbury
… (Pastinaca sativa L.) ground cover on the parasites of organic apple orchards was examined. The indirect influences on the major pest species, codling moth (Cydia pomonella L.) and lightbrown apple moth (Epiphyas postvittana (Walker)) were also investigated. Sampling was carried out in the …
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Habitat variation effects on cavity-nesting bee fitness, community assemblages, and parasite interactions in the Colorado Front Range
… ability, reproduction and brood development, parasite abundance, and community network metrics. This was done by deploying artificial nesting boxes in the ponderosa pine forest of Boulder County, CO that either burned at higher severity, thinned by hand, or were unburned and untreated control. …
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Temporal variation in infection of male sardine (Sardinops sagax) by a coccidian testicular parasite (Eimeria sardinae)
… (Sardinops sagax) by a testicular coccidian parasite Eimeria sardinae was examined between putative western and southern stocks of this fish species. Samples were collected by commercial vessels from five localities; Gansbaai, St Helena Bay, Mosselbay, Port Alfred and Port Elizabeth (west and …
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The ecology of a host-parasite relationship: haemogregarines and the eastern water skink, Eulamprus quoyii
… and ecology. However, knowledge of how hosts and parasites interact in natural systems remains limited, and there is a critical need for further research. Therefore, this thesis examines the ecology and interactions between wild populations of hosts, the eastern water skink, Eulamprus quoyii, and …
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DISEASE IMPACTS ON MOOSE (ALCES ALCES) HEALTH AND ECOLOGY ALONG THEIR SOUTHERN RANGE LIMITS: PARASITES AS A LIMITING FACTOR IN NEW YORK
… and disease. Moose are hosts for numerous parasite species, some of which cause severe pathology and impact survival and population trajectories. Two parasites, meningeal worm (Parelaphostrongylus tenuis) and giant liver fluke (Fascioloides magna), incidentally infect and sometimes kill …
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Parasite assemblages of Cape horse mackerel (Trachurus capensis Castelnau, 1861) from the northern and southern Benguela
A survey of parasites infecting Cape horse mackerel, Trachurus capensis Castelnau, 1861, from both the southern and northern Benguela ecosystems was conducted to test the hypothesis of discrete stocks in each subsystem. One hundred and twenty five T. capensis of two size classes were collected off …
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Trematode Communities of the Appalachian Stream Snail, Elimia proxima: the Importance of Scale in Parasite Ecology Research
… the ecological processes that impact parasite abundance and distribution is critically important for epidemiology and predicting how infectious disease dynamics may respond to future disturbance. Digenean trematodes (Platyhelminthes: Trematoda) are parasitic flatworms with complex, …
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<i>Plasmodium</i>-Induced Nitrosative Stress in <i>Anopheles stephensi</i>: The Cost of Host Defense
… inhibit <i>Plasmodium</i> spp. (malaria parasite) development via induction of nitric oxide (·NO) synthase. Expression of <i>Anopheles stephensi</i> ·NO synthase (<i>AsNOS</i>) is induced in the midgut epithelium beginning at 6 h following a <i>Plasmodium berghei</i>-infected blood meal. …
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Parasite-host interactions in an arctic goose colony
… alterations in range, virulence, prevalence, and abundance, and the effect these may have on their host populations. Parasites influence the reproductive success of their hosts in some cases. Studies on impacts of ectoparasites on avian reproductive success have generally been focused on species …
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Assessment of the population structure of the South African sardine Sardinops sagax using a multi-method approach and the morphological and molecular characterization of a stock-discriminating digenean parasite biotag of the genus Cardiocephaloides
… body shape, otolith shape, vertebral count, parasite loads), but the application of multiple stock identification methods to the same individual fish has been recommended in order to maximize the likelihood of correctly inferring and identifying fish stocks. This study seeks to assess the …
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The stability of model ecosystems
… ecosystem can increase with complexity when the abundance distribution is characterized by a skew towards many rare species. This work adds to the growing number of conditions under which the negative stability - complexity relationship can been inverted in theoretical studies. While there is …