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 22 for “"Isopod"”.
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Lead tolerance in the freshwater isopod asellus aquaticus
After a survey of the occurrence of Asellus aguaticus in South Lancashire rivers, one site on the polluted river Calder and another on the unpolluted Woodplumpton Brook were selected for further investigation. Calder Asellus were shown to be more tolerant to lead than Woodplumpton Asellus but there …
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Biology and ecological energetics of the supralittoral isopod Ligia dilatata
… of the supralittoral rocky shore kelp-eating isopod Ligia dilatata Brandt.
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A study of the littoral marine isopod Crustacea of the Dillon Beach area
… accurate diagnoses of the littoral marine isopod crustacea in the Dillon Beach area. Such a purpose involved a much more complete study of the anatomy of the species represented in the fauna than was heretofore performed. Certain anatomical structures deemed by earlier writers as …
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Understanding the evolution of cymothoid isopod parasites using comparative genomics and geometric morphometrics
… of host-parasite co-evolution is shownby the isopod family Cymothoidae, of which all species are obligate parasites of fishes,including many commercially important fish species. Cymothoids are one of the mostdiverse isopod groups, with 400 species across 43 genera, and they exhibit …
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Factors influencing parasite-related supression of mating behavior in the isopod caecidotea intermedius
… dirus, infects the stream-dwelling isopod Caecidotea intermedius as an intermediate host and one of several freshwater fishes as a definitive host. Inside the isopod, A. dirus develops from the early non-infective acanthor and acanthella (immature) stages to the late infective …
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Factors influencing parasite-related suppression of mating behavior in the isopod Caecidotea intermedius
… dirus, infects the stream-dwelling isopod Caecidotea intermedius as an intermediate host and one of several freshwater fishes as a definitive host. Inside the isopod, A. dirus develops from the early non-infective acanthor and acanthella (immature) stages to the late infective …
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Comparative analysis of aquatic insect, amphipod, and isopod community composition along environmental gradients in rheocrene spring systems of Missouri
… In this study, aquatic insect, amphipod, and isopod communities were examined in 16 spring systems in Missouri, in some of which associated environmental gradients were also measured. The goal of this study was to create a comprehensive list of species present in all studied systems, as well …
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Response of a cave aquatic community to groundwater pollution
… decreases in concentration of dissolved oxygen. Isopod (Caecidotea recurvata) and amphipod (Stygobromus mackini) density and isopod size-class distributions were measured seasonally with short-term mark-recapture techniques. Isopods were absent only in highly disturbed sites. Highest isopod …
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Interactions between Portunion Conformis (Epicaridea: Entoniscidae) and two host species
… In the present study, interactions between this isopod and populations of both hosts in Tomales Bay, California, are described, including the influence of host species, sex and size on parasitic infestation and the effects of the parasites on secondary sexual characteristics of the hosts, as well …
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The Biology of Spaeroma Terebrans in Lake Pontchartrain, Louisiana with Emphasis on Burrowing
… important cosmopolitan species because this isopod is found burrowed in wood and marine structures of fresh to saline water. Existing literature on S. terebrans focuses on the destruction of red mangrove (Rhizophora mangle) in India, Pakistan, and Florida. This study concentrates on S. …
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The Developmental and Genetic Basis of Differences in Cave and Surface-dwelling Forms of the Crustacean, Asellus aquaticus
… an invertebrate model system the freshwater isopod crustacean <em>Asellus aquaticus</em>, which contains both surface-dwelling and blind cave-dwelling forms. Our goal was to investigate how and when during embryonic development all of these morphologically differences came about. In addition, …
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Adaptations of Terrestrial Isopods to Varying Wavelengths of Light
… was to determine the response of terrestrial isopods that were subjected to prolonged periods of varying wavelengths of light, and to measure this adaptability by locomotor activity. Procedure. Terrestrial isopods were randomly collected from their natural environments, placed in study …
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Trophic transfer of nearshore basal resources: interpreting fatty acid and stable isotope biomarkers
… In Chapter 4 I used a fast-growing herbivorous isopod in a laboratory feeding trial to test the hypothesis that the FAMSI signatures of diets are assimilated predictably into consumer tissue. This experimental work took advantage of the earlier discovered patterns from Chapter 2 and evaluated …
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Impacts of ocean acidification and other (global change) stressors on marine invertebrates
… and estuarine invertebrates: the anthuroid isopod Cyathura carinata (Krøyer, 1847), the benthic ragworm Hediste diversicolor (O.F. Müller, 1776), the sea snail Tritia neritea (Linnaeus, 1758), the most versatile amphipod Ampelisca brevicornis (Costa, 1853), and the pseudodiaptomid copepod …
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The physiological ecology of the specialist lagoon amphipod, Gammarus insensibilis
… on the reproductive investment of the lagoonal isopod Idotea chelipes (Pallas). <br/><br/>Gilkicker lagoon on the south coast of England, UK, from which the majority of samples were taken, demonstrated environmental variability characteristic of coastal lagoons. Annually, temperature varied …
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Fish parasites as bio-indicators of heavy metals in two South African embayments
… and Callorhinchicola multitesticulatus) and an isopod (Anilocra sp.). The cestode was the most prevalent at 68.4 % and the monogenean, C. callorhynchi was the most abundant (1.68 ±0.78) and had the highest infection intensity (4.00 ±1.45). The SAC and biodiversity measures indicate a uniform …
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The biology and macroparasites of the sixgill sawshark Pliotrema warreni
… in the stomachs. Three specimens of a cymothoid isopod was found externally. Two specimens of Ascaris sp. nematode were found in the visceral cavity. The remaining 18 parasites consisted of three Neoechinorhynchidae sp. of acanthocephalan and 15 Proleptus obtusus nematodes all of which were found …
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Invertebrate plankton assemblages in the surf zones of St. Lucia and Mhlathuze Estuaries, KwaZulu-Natal, South Africa
… zone/beach mysids of the genus Gastrosaccus, the isopod Grolana spp. and amphipods. Classification and ordination analyses revealed distinct day and night communities, with less seasonal and spatial (site) differences. Nine and eight fauna! assemblages separated on basis of season were identified …
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Ecological studies of isopoda and diplopoda in dune grassland
… vulgare, Porcellio scaber, Philoscia muscorum (Isopoda) and Cylindroiulus latestriatus (Diplopoda). Population data were available for the species from 1968 to 1975. Preliminary investigations indicated little difference in the diet of each species and in their interactions with predators; …
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Assessment of water pollution arising from copper mining in Zambia: a case study of Munkulungwe stream in Ndola, Copperbelt province
… and S3 was dominated by species tolerant (leech, Isopod and Snail: Pouch) and semi tolerant (Blackfly larvae and Amphipod or Scud) to pollution. The change in season influenced the composition of macroinvertebrates, with the number of species increased post rainy season. The average biotic index …
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