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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 73 for “"Macrofauna"”.
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Physical and biological factors structuring sandy beaches macrofauna communities
Previous sandy beach research described beach macrofaunal communities according to the swash exclusion hypothesis (SEH). This hypothesis stated that more species are present on fine grained, flat dissipative beaches due to a more benign swash climate. It suggested that, as beach morphodynamics …
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Long-term changes in the benthic macrofauna of Saldanha Bay
… this study were to determine whether the benthic macrofaunal communities in the Bay have been altered over this period and to explore the benthic community patterns within the Bay prior to and after harbour development.
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The influence of macrofauna on intertidal sediment stability and biogeochemical properties.
Macrofauna are known to have a significant effect on intertidal sediment stability and biogeochemical properties. A series of manipulative in situ mudflat studies at Breydon Water, Great Yarmouth, UK investigated the effect of biodiversity on selected biogeochemical sedimentary properties related …
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Contributions to the ecology of the Benthic macrofauna of the Bot River Estuary
This thesis forms part of a multi-disciplinary study of the Bot River estuary, situated between Kleinmond and Hawston on the southwest coast of the Cape Province, and falls within the framework of the investigation of all Cape estuaries, initiated by SANCOR and co-ordinated by the Estuarine and …
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Assessing the rate of recovery of benthic macrofauna after marine mining off the Namibian coast
The primary aim of this study was to assess the rate of recovery of macrobenthic communities after offshore marine mining. Three techniques, namely univariate, distributional and multivariate, were used to make this assessment. Two distinct areas, the northern and southern research areas, were …
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Resposta da macrofauna bêntica estuarina a distúrbios : experimentos de eutrofização e recolonização no Canal de Santa Cruz-PE
… os efeitos do enriquecimento inorgânico sobre a macrofauna bêntica e (2) os padrões de recolonização do macrobentos e o tempo requerido para sua recuperação após defaunação por hipoxia/anoxia. Os estudos foram realizados em uma planície de maré lamosa no Canal de Santa Cruz (Itamaracá-PE), no …
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Comunidades de macrofauna asociadas a zonas de rompiente de playas arenosas en el golfo de cádiz (so península ibérica)
Among the great diversity of coastal ecosystems throughout the world, sandy beaches are one of the most important due to their size, occupying a third of the world's coastline, and their dynamism as an interface between land and ocean. Within beaches, the surf zone is of great biological importance …
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Produção secundária das espécies mais abundantes da macrofauna bentônica da zona entre-marés da Prainha, estado do Rio de Janeiro
With the aim of estimating the secondary production of Emerita brasiliensis and Exciro lanabrailiensis, at Prainha Beach(R), monthly samplings were performed in the period fom June 1 993 to May 1 995. Three transects were established in the intertidal zone, perpendicular to the waterline, each …
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Multivariate analyses of the impact of offshore marine mining on the benthic macrofauna off the west coast of Southern Africa
The strategy for analysing multivariate data presented by Field et. al. (1982) was tested for its sensitivity in detecting the effects of offshore marine mining on macrobenthic communities. The technique has proven to be particularly sensitive and robust in elucidating changes in the structure of …
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Function and diversity of the Ship, Trinity, and Tiger Shoal Complex, with emphasis on macrofauna and spawning blue crabs (Callinectes sapidus)
… off-shoal areas, prone to hypoxia. Benthic macrofaunal assemblages of shoals included endemic species, and shoal communities were significantly different from each other and the muddier offshoal habitat, contributing to northern Gulf of Mexico (GoM) regional biodiversity. Sand percentage was …
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The application of univariate and distributional analyses to assess the impacts of diamond mining on marine macrofauna off the Namibian Coast
This study is one of three based on grab samples of macrobenthos obtained before and at different times after mining for diamonds off the coast of Namibia. The first study dealt with multivariate clustering analysis of the first samples before and after mining. The second study focused on recovery …
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Variação temporal da macrofauna bentônica sublitoral da praia da Urca (RJ) após a ocorrência de ressacas, com ênfase na fauna de anelídeos poliquetas
… situated at Rio de Janeiro state. Density of the macrofauna was monitored along a year, after the beginning of a great storm at that region in 2th July, 1997, being considered the most strong event at the last thirty years. During the period studied, three more storms were registered, although …
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Composição da fauna bêntica rasa em duas estações (12 e 25 metros de profundidade) ao longo de um ciclo anual na Baía do Almirantado, Ilha Rei George, Antártica
The megafauna, macrofauna and Polychaeta communities at 12 and 25 meters depth in Admiralty Bay (King George Island, Antarctica) were studied along the Antarctic winter (March to December 1999) and summer (December 2000 to March 2001 ), through an entire seazonal cycle. Samplings were carried out …
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NAKED GOBIES (GOBIOSOMA BOSC) AS INDICATORS OF OYSTER REEF RESTORATION SUCCESS
… substrate. Naked gobies and other resident macrofauna were collected from experimental oyster reefs, constructed using adult oysters of various densities, loose oyster shell, and ambient sediment. Naked goby abundance, length, dry weight, and biomass increased with the availability of oyster …
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Diversity of meiofauna at deep-sea hydrothermal vents and cold seeps with particular reference to nematodes
… are remarkable for their spectacular megaand<br/>macrofauna, many of which appear to have a high level of endemism to these chemosynthetic<br/>environments. It is not clear whether the patterns of biodiversity, faunal zonation<br/>and biogeography documented in these size categories, are also …
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The ecological effects of collecting Callianassa kraussi Stebbing and Upogebia africana (Ortmann) for bait : impacts on the biota of an intertidal sandflat
… It is estimated that approximately 543 g of macrofauna are disturbed with each bag limit of prawns (50) removed, amounting to approximately 10 000 kg of macrofauna being disturbed annually. While the fate of this macrofauna is not completely determined, approximately 80 is subsequently preyed …
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The Effects of Benthic Organisms on Intertidal Sediment Erodibility
… sediment characteristics. Small bioturbating macrofauna, predominantly freely motile species < 5 mm in size, destabilized surface sediments (-Ʈc and +ER), whereas microbes and organic matter were resuspended during surface erosion. In contrast, increasing mud and mean grain size stabilized …
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Improving the applicability of metabarcoding to monitor salmon farming impacts on benthic environments
… through morphological identification of macrofauna, is time-consuming and expensive. These limitations can be overcome with environmental DNA (eDNA) metabarcoding. To utilise metabarcoding for regulatory monitoring, an understanding is needed of the sources of variability in …
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