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 312 for “"pelagic"”.
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Pelagic
… chapters from the beginning of the fantasy novel Pelagic, the first book in a trilogy set in a secondary world. The rough draft of the book was completed January 2023, and the following chapters are either rewrites or new content produced for the second draft. Pelagic follows Maeve Brontide as she …
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Breeding Jackass Penguins as pelagic predators
The foraging of breeding Jackass Penguins Spheniscus demersus was studied in and around southwestern Cape Province, Saldanha Bay (33⁰ S, 18⁰ E), South Africa. Penguins are difficult to observe at sea. Hence, I devised a number of new techniques for studying the foraging behaviour of Jackass …
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Ecology of the pelagic fish resources of Lake Tanganyika
Most of the scientific knowledge on the pelagic fish (the clupeids Stolothrissa tanganicae and Limnothrissa miodon and the centropomid Lates stappersii) of Lake Tanganyika is from research carried out in localised areas. This makes it difficult to extend the results to the whole lake. Consequently, …
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Forecasting pelagic fish in Malaysia using ets state space approach
Modelling and forecasting fish catch has been undertaken for a long time over the world. However, From time to time, researchers are always looking for a new model that can predict more accurately the number of fish catch. The objective of this study is to propose the Error Trend and Seasonal (ETS) …
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Drivers of variation in the migration and foraging strategies of pelagic seabirds
… of minimum sample sizes needed to track pelagic seabird migrations, using data from 10 species. In Chapter 3, I examine between- and within-population differences in the habitat preferences and distributions of albatrosses, including the relative roles of habitat specialization and …
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Multidisciplinary investigation into stock structure of small pelagic fishes in southern Africa
Three abundant small pelagic fish species co-occur in the Benguela upwelling ecosystem off southern Africa: sardine (Sardinops sagax), anchovy (Engraulis encrasicolus) and round herring (Etrumeus whiteheadi). It is hypothesised that populations of these species have a complex structure that …
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On the calculation of pelagic fish shoal tonnage by nighttime aerial observation
Contains published articles.
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Understanding and mitigating seabird bycatch in the South African pelagic longline fishery
… two types of longline fisheries (demersal and pelagic), pelagic longlining is considered the most harmful to seabirds as lines remain closer to the surface for longer periods than demersal longlining, and it is harder to weight lines to ensure rapid sinking beyond the depth they are accessible …
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Quantifying pelagic primary production and respiration via an automated in-situ incubation system
Pelagic photosynthesis and respiration serve critical roles in controlling the dissolved oxygen concentration (DO) in seawater. The consumption and production via pelagic primary production are of particular importance in surface ocean and in shallow aquatic ecosystems where photosynthetically …
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Movements and oceanographic associations of large pelagic fishes in the North Atlantic Ocean
… of knowledge on oceanographic associations of pelagic fishes and hinders management efforts. With ever-improving oceanographic datasets and modeling outputs, we can leverage these tools both to derive better estimates of animal movements and to quantify fish-environment interactions. In this …
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Benthic-pelagic coupling : rocky intertidal communities and nearshore oceanographic conditions across multiple scales
In Chapter 1, I characterize geographic patterns in rocky intertidal communities across 6° of latitude along the west coast of South Africa and examine the spatial structure of functional group biomass in relation to wave action and upwelling intensity. Despite between-habitat differences in …
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Movements and oceanographic associations of large pelagic fishes in the North Atlantic Ocean
… of knowledge on oceanographic associations of pelagic fishes and hinders management efforts. With ever-improving oceanographic datasets and modeling outputs, we can leverage these tools both to derive better estimates of animal movements and to quantify fish-environment interactions. In this …
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Form, function and flow in the plankton : jet propulsion and filtration by pelagic tunicates
Trade-offs between filtration rate and swimming performance among several salp species with distinct morphologies and swimming styles were compared. Small-scale particle encounter at the salp filtering apparatus was also explored. Observations and experiments were conducted at the Liquid Jungle …
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A study of the pelagic gastropods of the Dillon Beach area pteropods and heteropods
… the material for the present study.</p><p>Pelagic gastropods were present in every tow in varying numbers and species. Two groups, pteropods and heteropods, were found in the samples. One species of pteropod, Limacina helicina, was the dominant member in all of the tows and occurred during …
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The structure of pelagic seabird assemblages in the African sector of the Southern Ocean
This study investigated the potential usefulness of aerial seabirds as indicators of the distribution of peculiar oceanic biotopes and prey populations in the African sector of the Southern ocean. The hypothesis examined was that the distribution and abundance of seabirds are non-random and …
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Impacts of burrowing sandprawns (Kraussillichirus kraussi) on water quality, phytoplankton and pelagic bacterial assemblages
… effects of sandprawns are consistent across pelagic bacterial and phytoplankton assemblages or whether there are any discriminatory responses. Findings demonstrated that increasing sandprawn density did not significantly reduce the abundance of bacterial water quality indicators (Escherichia …
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Developing dynamic energy budget (DEB) models for small pelagic fishes in the Southern Benguela
… ecosystems. Differential responses of small pelagic fish species to environmental factors help in understanding the variable population dynamics of these species and can help predict the impacts of climate change.
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Form, function and flow in the plankton : jet propulsion and filtration by pelagic tunicates
Trade-offs between filtration rate and swimming performance among several salp species with distinct morphologies and swimming styles were compared. Small-scale particle encounter at the salp filtering apparatus was also explored. Observations and experiments were conducted at the Liquid Jungle …
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A qualitative and quantitative study of the distribution of pelagic sediment in the Atlantic Basin
Pelagic sedimentation is the primary modifier of topography generated by ridge-associated volcanic and tectonic processes. This thesis represents an effort to understand the processes of, and the general distribution of, pelagic sedimentation on rough topography, particularly in the Atlantic Basin …
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Stable isotopic insight into pelagic carbon cycling in Loch Lomond: a large, temperate latitude lake.
… utilising allochthonous carbon is to overall pelagic production in Loch Lomond, Scotland. Stable isotopic composition of dissolved inorganic carbon (DIC), dissolved oxygen (DO), dissolved organic carbon (DOC) and total dissolved nitrogen (TDN), along with their respective concentrations, were …
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