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 12 of 12 for “"Soft-bottom"”.
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Spatial distribution and diversity of soft-bottom benthic invertebrates from demersal trawl surveys off the coast of Namibia
… the spatial distribution and diversity of soft-bottom benthic invertebrates collected during the Ministry of Fisheries and Marine Resources' annual monkfish, hake, and deep-sea red crab demersal surveys for the years 2018-2020, along the northern, central, and southern coast of Namibia. The …
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Use of demersal bycatch data to determine the distribution of soft-bottom assemblages off the West and South coasts of South Africa.
This project aims to analyse information on invertebrate biodiversity patterns of the offshore benthos around South Africa. Samples were collected as bycatch from demersal trawl surveys conducted along the South (one cruise) and West Coasts (two cruises).
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The relationship of sexual dimorphism and differential predation to sex ratio in Leptochelia dubia (Crustacea: Tanaidacea)
… may attain densities of 30,000/m<sup>2</sup> in soft bottom communities.
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A genetic and morphologic comparison of Macoma balthica from the eastern and western North Atlantic
… that is common to both marine and estuarine soft-bottom habitats of the northern hemisphere. to determine if populations on the eastern and western North Atlantic are conspecific, the labial palp morphology, shell shape and genetic composition of these populations were examined. Previously …
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Natural patterns and anthropogenic disturbance in north Adriatic marine benthic assemblages: descriptive and methodological studies
Marine soft bottom systems show a high variability across multiple spatial and temporal scales. Both natural and anthropogenic sources of disturbance act together in affecting benthic sedimentary characteristics and species distribution. The description of such spatial variability is required to …
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Foraging Ecology and Demography of Sternotherus Odoratus in a Southwestern Missouri Population
… crepuscular turtle that inhabits a variety of soft-bottom aquatic ecosystems from stream and rivers to lakes, ponds, and ditches. Previous studies have examined its diet, but few have addressed other aspects of its feeding ecology. The objectives of this study were three-fold: 1) to collect …
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Epifaunal assemblage of a newly established oyster reef with two substrates
… converting the trays from hard substrate to soft bottom habitats. Any influence the different substrates might have had on community development was overwhelmed by sediment burial. Monthly field observations revealed positive oyster community development on both substrates. Live oyster …
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Reef fish demographics on Louisiana artificial reefs : the effects of reef size on biomass distribution and foraging dynamics
… sourced from the surrounding water column and soft bottom sediments. Additionally, no evidence of an area of prey depletion (feeding halo) was found around the two habitats, further indicating that prey is derived opportunistically from areas surrounding the reef structures.
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Fish Vocalisation: Understanding its biological role from temporal and spatial characteristics
… to the ambient sound of their off-shore soft bottom habitat and that field recordings in these areas may be a useful means of investigating gurnard biology and monitoring populations. The present study has also described for the first time the bioacoustic environment of a fish aggregation …
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The role of abiotic and biotic interactions in deep-sea benthic habitats of the northeastern Gulf of Cadiz
… massive and fluid extrusive, biogenic, and bottom current-related processes (both depositional and erosive) determines the distribution of substrate types and benthic communities, which have been classified as belonging to different benthic habitats. In a second phase, based on the same …
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Very low frequency seismo-acoustic noise below the sea floor (0.2-10 Hz)
… a one week period is compared between an Ocean Bottom Seismometer (OBS) and SEABASS at sub-bottom depths of 10, 40, 70 and 100 meters below the sea floor. The 0.3 H z microseism peak is found to be nearly invariant with depth and has a power level of 65 and 75 dB rel 1 (nm/ s2)2)/ H z for the …