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 18 of 18 for “"ECOPATH"”.
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Observer effects on pelagic fleet operations and Bayesian-based explorations of the mass balance model ECOPATH
… the ability of constraints associated with the ECOPATH mass-balance equations to improve knowledge on estimates of parameters in the southern Benguela ecosystem. Sardine and anchovy are the most valued and carefully managed species of small pelagic fish in South Africa. The problem of dumping in …
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Modelling South African cold-water coral habitats
… is tested in this study using a customised Ecopath with Ecosim model. The model is applied to Childs Bank, a region on the west coast of South Africa located in the southern Benguela eastern boundary ecosystem. A previously constructed Ecopath model of the southern Benguela was modified to …
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Reconstructing the Benguela ecosystem for a time before man's intervention
… and function. This will be investigated using Ecopath with Ecosim (EwE) There are currently available, models of the Benguela ecosystem based on modern catch and biomass data that cover the period from the 1970, or '80s, until the 2000s (Shannon et at., 2003; Heymans et al., 2004, Roux & …
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An ecosystem-based approach to study two dolphin populations around the island of Kalamos, Ionian Sea, Greece
… rates. I constructed an ecosystem model using Ecopath with Ecosim for the northeastern Ionian Sea to explain the two different abundance trends of these species of dolphins, and the trophic interactions with their prey and with the fisheries. The Ecopath model was built for the year 1964, …
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Modelización ecológica del Golfo de Cádiz: Relaciones Tróficas, Análisis de la Estructura de la Comunidad e Impacto de la Pesca en el ecosistema
… el mundo, es la modelización mediante el enfoque Ecopath with Ecosim (EwE). Su aplicación, proporciona información sobre la estructura de la red trófica, el funcionamiento y las propiedades emergentes de un ecosistema explotado, basada en las interacciones tróficas que tienen lugar entre todos los …
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The influence of spatiotemporal variation in food web models
… in each of Lake Erie’s three basins using Ecopath modelling. Unique environmental characteristics of each basin in Lake Erie influenced stable isotopes in lower trophic levels, and food web structure and function. Strong temporal variation in stable isotopes of δ13C, δ15N, and δ34S in …
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Spatialised ecosystem modelling to evaluate the influences of marine protected areas and provisioning ecotourism on the foraging and distributional response of top predators from Mossel Bay to Algoa Bay, South Africa
… response of top predators in the system. The Ecopath with Ecosim (EwE) and Ecospace modelling framework was utilised to investigate the distributional response of sharks and top predators on the South-East coast to the introduction of two new MPAs (in 2019) and seasonal provisioning for shark …
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Addressing the impact of the EU CFP landing obligation on the northern North Sea ecosystem and Shetland fisheries in a changing climate.
… Obligation (LO) and climate change. Building an Ecopath with Ecosim (EwE) model of northern North Sea (International Council for the Exploration of the Sea ICES division IVa) allowed for secondary consequences of how the LO may affect ecosystem dynamics and fisheries in the area; and how impacts …
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Modelling the food web in the Irish Sea in the context of a depleted commercial fish community
… This thesis describes the development of an Ecopath with Ecosim (EwE) food web model for the Irish Sea as part of WKIrish. The EwE model follows the best practices for model construction, like many of the more recently developed models, yet it stands apart from others due to its creation at …
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Changes in food web structure and energy flow in kelp forest ecosystems on the south-west coast of South Africa following the invasion of Jasus lalandii
… algae. Using the trophic modelling software Ecopath with Ecosim, baseline models of the pre- and Post-invasion systems were created to better understand trophic pathways between the two different states and assess how fishing pressure may have driven the shift in ecosystem state. Using the …
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Using seasonal mass-balanced models of the Algoa Bay ecosystem to investigate African penguin and small pelagic fish interactions
Ecopath with Ecosim is a modeling software that allows the creation of mass-balanced models of the trophic flows of an ecosystem to explore the past and present impacts of fishing and environmental change on the trophic flows of a given food web. Currently, Algoa Bay supports the world’s largest …
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Assessing the effects of internal (trophic structure) and external (fishing and environment) forcing factors on fisheries off central Chile : basis for an ecosystem approach to management
… models are constructed and analyzed using the Ecopath with Ecosim software version 5.1 and routines therein. The observed trends in indicators and model results are in accordance with what is theoretically expected in stressed ecosystems (shift towards a food web dominated by short-lived, low …
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Investigating the trophic ecologies of early life stages of small pelagic fishes in the Benguela upwelling ecosystem
… for variances seen in their trophic ecology. The Ecopath model that included a finer life history of anchovy, sardine and round herring exhibited substantially more small pelagic fish-centred trophic pathways that were previously grouped into plankton groups than the model that did not. As a …
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Trophic role of small cetaceans and seals in Irish waters
… obtained from the four coastal species, an ECOPATH food web model was established for the Irish Sea, based on data from 2004. Five trophic levels were found, with bottlenose dolphins and grey and harbour seals occurring at the highest trophic level. A comparison with a previous model based …
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Walking the bridge from single- to multi-species approaches in Southern African fisheries management
… multi-species/ecosystem approach (ECOPATH with ECOSIM or EwE) as well as a scenario in which there is an urgent need (from management) for scientific evaluations to quantify indirect interactions between marine mammals and fisheries. A critical review of EwE highlights some …
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Addressing the land loss-fish production paradox
Saltmarsh loss is occurring at high rates in Louisiana (LA), but understanding the impacts that marsh degradation has had on historical abundance of estuarine nekton in Barataria Bay, LA is lacking. I first examined the differences between fishery independent and fishery dependent data as indices …