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 16 of 16 for “"bathyal"”.
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Assemblage Comparisons of Living Benthic Foraminifera at Bathyal Sites Oiled and Un-Oiled by the Deepwater Horizon Blowout in the Northeastern Gulf of Mexico
… were studied at contaminated and uncontaminated bathyal sites around the wellhead of the Deepwater Horizon oil spill. Samples collected in October of 2010 and 2011 and summer of 2012 were divided into uncontaminated (GIP 12, 21, K, and 25 and Obs0), moderately oiled (GIP 16 and 17) and heavily …
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Benthic protozoan community attributes in relation to environmental gradients in the Arabian Sea
… and an organic test that is abundant in the bathyal Arabian Sea. Deep-water Gromia-like morphospecies were discovered in the 1990’s but their relation to shallow-water species was not established. Little is known about gromiid diversity, reflecting the fact that these relatively featureless …
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From brain development to reproductive axis: an integrated study of the nervous system in cartilaginous fish
… G. melastomus, some traits were consistent with bathyal cerebrotypes, extending current knowledge of deep-sea shark neuroecology. Second, a comparative analysis of brain organization across 14 central-western Mediterranean species revealed clear habitat-related patterns. Bathyal taxa showed a …
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Phylogenetics, systematics and biogeography of deep-sea Pennatulacea (Anthozoa: Octocorallia): evidence from molecules and morphology
… from deep-water ancestors.<br/>Conversely, the bathyal Anthoptilidae was the most primitive of families, and although<br/>more evidence is required, pennatulids as a group may have originated in deep water.<br/>The systematics of the exclusively deep-sea genus Umbellula, which contains …
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The role of abiotic and biotic interactions in deep-sea benthic habitats of the northeastern Gulf of Cadiz
… 100 videos and 50 samples, benthic habitats in a bathyal area of more than 1000 km2 in the shallow part of the Site of Community Importance (SCI) denominated Volcanes de fango del golfo de Cádiz(Mud volcanoes of the Gulf of Cádiz) have been mapped and characterised. A total of 11 types of benthic …
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Distribution of epifauna in offshore benthic environments along the west and south coast of South Africa
… type on the south coast and South Atlantic Upper Bathyal and Namaqua Muddy Inner Shelf ecosystem types on the west coast. This thesis contributes to the mapping and description of offshore ecosystem types to inform marine environmental impact assessments, marine spatial planning and marine …
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Assessing the impact of multiple environmental stressors on Atlantic Ocean deep-sea sediment ecosystems functioning.
… cues for feeding (chapter 4). Finally, upper bathyal sediment community oxygen consumption was sensitive to warmer temperatures, almost doubling with +2oC, with a significantly lower processing rate of degraded phytodetritus, both likely caused by the response of the bacterial community …
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Cenozoic deep-water agglutinated foraminifera in the North Atlantic
… occurs at the Paleocene/Eocene boundary in all bathyal sections studied, and agglutinated forminifera disappear entirely from abyssal low-latitude DSDP sites. In the Gibraltar Arch, the Labrador Sea and the Norwegian-Greenland Sea, the Ypresian/Lutetian boundary is characterized by a …
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Reproduction and larval biology of North Atlantic asteroids related to the invasion of the deep sea
… This can be clearly observed in the upper bathyal zone between 700 and 1100 m, where the environmental conditions have selected for small species with low fecundity and large eggs, plus habits related directly or indirectly with suspension feeding. These species exhibit reproductive …
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The feeding ecology of deposit-feeding holothurians
… the tropics (Pawson, 1970; Bakus, 1973) and at bathyal depths (Hansen, 1975). The occurrence of suspension feeding dendrochirotids is related to the availability of suspended material (Lawrence, 1982); they are most prominent in temperate and sub-tropical regions but not in clear tropical waters …
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Geology of Mangapanian (late pliocene) strata, Wanganui Basin: lithostratigraphy, paleontology and sequence stratigraphy
… and each displays an inner-shelf to upper bathyal depositional profile. Molluscan water-depth estimates for each of these units indicate that they are transgressive deposits, and together with their overlying siltstone and sandstone units comprise a 41 k.y. sequence. Similarities in the …
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Enviromental influences on the spatio-temporal distribution of Aristeus Antennatus (Risso, 1816) and Aristaeomorpha Foliacea (Risso, 1827) in the Central-Western Mediterranean
… species occur almost exclusively on the “meso-bathyal” stratum (500-800 m). The distribution pattern appears quite different for the two species, and the abundance indexes as well the spatial maps, evidenced local higher abundances (hotspots) where the blue and red shrimp and the giant red …
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Analysis of the central Hawke's Bay sector of the Late Neogene forearc basin, Hikurangi margin, New Zealand
… This group comprises four deepening-upward bathyal-dominated packages with shelfal beds at their base. This succession is overlain by a thick sandstone (Mokonui Sandstone). Mokonui Sandstone is unconformably overlain by the Mangaheia Group (Upper Kapitean-Upper Nukumaruan), characterised by …
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Characteristics and evolution of a dynamic prograding continental margin: the late Neogene Giant Foresets Formation, northern Taranaki Basin, New Zealand
… Depositional environments changed from mid/lower bathyal during the Late Pliocene, to upper bathyal during the Waipipian and Mangapanian. However, the most rapid aggradation and progradation of the continental margin occurred during the Mangapanian to Late Nukumaruan, with progradational rates as …
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Post-larval development in deep-sea echinoderms
… status is proposed. Ophiocten gracilis is a bathyal brittle star occurring on both sides of the North Atlantic and its life history is studied in the eastern side of the North Atlantic. In this area, O. gracilis spawns in February/March of each year producing a large number of eggs. Fecundity …
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INTEGRATING SEDIMENTOLOGY, STRATIGRAPHY, GEOCHEMISTRY AND 3D GEOLOGICAL MODELLING: CONTRIBUTION TO GEOLOGICAL MAPPING FOR LAND KNOWLEDGE (CARG SHEET 081 ¿ROVERETO¿)
… transition of the wave-cut carbonate platform to bathyal settings outside the carbonate productivity window, resulting in the deposition of the red, condensed pelagic sediments directly above the unconformity. The role of extensional tectonics is manifested with the occurrence of neptunian dykes …