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 32 for “"mesopelagic"”.
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Trophic Ecology of Mesopelagic Fish Larvae and Juveniles in the Northern Gulf of Mexico
<p>The deep-pelagic environment encompasses ocean waters below 200 m depth, and comprises 90% of the volume of the Gulf of Mexico. Deep-pelagic fishes are important prey for many oceanic consumers, but relatively little is known about their early life history, including larval fish trophic ecology. …
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Carbon flow and food web structure in the mesopelagic zone of the North Atlantic Ocean
Mesopelagic ecosystems are vital habitats that link the euphotic zone and the deep ocean through food web interactions and carbon flow pathways. In this dissertation, I use carbon compound-specific stable carbon isotope analysis of amino acids (CSIA-AA) and DNA gut metabarcoding methodologies to …
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Particle export and flux through the Mesopelagic in the high-latitude north and South Atlantic
… within the upper few hundred metres of the mesopelagic, above the permanent thermocline. Gaining more understanding of the factors controlling the BCP is hence important for understanding and predicting the global carbon cycle better. This thesis investigates the BCP in the Iceland Basin, …
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Carbon flow and food web structure in the mesopelagic zone of the North Atlantic Ocean
Mesopelagic ecosystems are vital habitats that link the euphotic zone and the deep ocean through food web interactions and carbon flow pathways. In this dissertation, I use carbon compound-specific stable carbon isotope analysis of amino acids (CSIA-AA) and DNA gut metabarcoding methodologies to …
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Movement and trophic ecology of large pelagic fishes connecting surface waters with the Ocean’s Twilight Zone
… to 1000 meters. Recent work in the twilight (or mesopelagic) zone has revealed unexpected biomass and diversity that may not only challenge scientific understanding of ocean systems but also provide new and largely untapped resources for fisheries harvest. The extent to which commercially …
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Movement and Trophic Ecology of Large Pelagic Fishes Connecting Surface Waters with the Ocean's Twilight Zone
… to 1000 meters. Recent work in the twilight (or mesopelagic) zone has revealed unexpected biomass and diversity that may not only challenge scientific understanding of ocean systems but also provide new and largely untapped resources for fisheries harvest. The extent to which commercially …
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Examining the feeding ecology of two mesopelagic fishes (Lampanyctodes hectoris & Maurolicus walvisensis) off the west coast of South Africa using stable isotope and stomach content analyses
Although mesopelagic fishes are an important component of marine food webs, the adaptive features used to facilitate niche partitioning among co-existing and presumably competing mesopelagic species is unclear. This study examined the trophic ecology of the two principal mesopelagic fishes off the …
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Reproductive patterns of deep-sea invertebrates related to phylogeny and energy availability
… The reproductive biology of five species of mesopelagic shrimp from the NEAtlantic and three species of hydrothermal vent shrimp from the Mid-Atlantic Ridge was examined and compared. The gonad morphology and gametogenic processes of the eight deep-sea species were similar and characteristic …
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Patterns among micronekton communities in relation to environmental conditions at two shallow seamounts in the south-western Indian Ocean
… broad categories: crustaceans, cephalopods and mesopelagic fishes. The vertical and horizontal distributions, assemblages and trophic relationships of micronekton were investigated at two shallow seamounts of the south-western Indian Ocean. La Pérouse is a steep bathymetric feature rising from a …
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Mid- to late Cretaceous Microbiostratigraphy, Palaeo-ecology and Palaeogeography of the Sergipe Basin, northeastern Brazil
… even possibly at intermediate (epi- to mesopelagic) water depths.
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Sources and Biochemical Composition of Detrital Organic Matter In theSea
… remineralization of semi-labile DOM in the upper mesopelagic (110-300 m) zone. Samples were collected at the US Joint Global Ocean Flux Study Program (JGOFS) time-series stations near Bermuda (BATS) and Hawaii (HOT) and analyzed for organic carbon, organic nitrogen, D- and L-amino acids, neutral …
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Carbon export from natural iron fertilisation in the Southern Ocean
… blooms to efficiently sequester carbon to mesopelagic depths is<br/>still an open question. SubAntarctic islands in the HNLC Southern Ocean are a natural<br/>source of iron and thus fuel the annual phytoplankton blooms observed in their<br/>proximity. One such bloom, tied to the Crozet …
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Examining the trophic ecology of five myctophid genera in the southern Benguela using morphological, stomach content and stable isotope analyses
Myctophids, mesopelagic fishes commonly known as lanternfish, are a vital component of the oceanic food web. However, significant uncertainties about the feeding habits of co-occurring and potentially competing myctophid genera still exist. This study examined the trophic ecology of five genera of …
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Acoustic minimization of Ocean Twilight Zone Vehicle, Mesobot
… was designed to mimic the migration patterns of mesopelagic organisms. Unmanned Underwater Vehicles (UUVs) have become a staple of ocean exploration for years, going where man is not able to. Although much quieter than noise from shipping traffic, the noise radiated from Mesobot could present …
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Biology of Albacore tuna (Thunnus alalunga, Bonnaterre 1788) off the South West Coast of South Africa
… Stomach content analysis indicated that the mesopelagic squid Lycoteuthis lorigera is the most important prey item for South African albacore. δ13C and δ15N stable isotope analysis of albacore and yellowfin tuna (T. albacares) muscle tissue showed that they feed on prey that may depend on …
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Acoustic Minimization of Ocean Twilight Zone Vehicle, Mesobot
… was designed to mimic the migration patterns of mesopelagic organisms. Unmanned Underwater Vehicles (UUVs) have become a staple of ocean exploration for years, going where man is not able to. Although much quieter than noise from shipping traffic, the noise radiated from Mesobot could present …
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The exo-proteomic framework for nitrogen acquisition from proteinaceous organic matter in the model marine heterotroph Ruegeria pomeroyi DSS-3
… are a key component of surface and upper mesopelagic particulate organic matter, and their rapid degradation by heterotrophic bacteria is an important process in releasing bioavailable nitrogen when other nitrogen containing substrates are deficient. Heterotrophs encode a wide variety of …
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Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean
… onto particles, generally presents maxima in the mesopelagic zone and minima below. A positive correlation between 𝑘1 and bulk particle concentration is found, consistent with the notion that the specific rate at which a metal in solution attaches to particles increases with the number of surface …
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The impact of metals and other stress factors on microbial ammonia oxidation physiology and isotope effects
… studies of nitrification have focused on the mesopelagic (high oxygen, comparably warmer temperatures, low NH4+, and low metal micronutrient availability). The Northern Guaymas Basin is functionally the opposite. We suggest ultimate limitation by temperature and, surprisingly, potential …
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