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Bibliografias temáticas / Marine ecosystem functioning / Teses / dissertações

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Teses / dissertações sobre o tema "Marine ecosystem functioning"

Autor: Grafiati

Publicado: 8 de fevereiro de 2025

Última modificação: 31 de julho de 2025

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1

Barausse, Alberto. "The integrated functioning of marine ecosystems." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3421989.

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An ecosystem-based approach to the management of marine ecosystems is the goal of the recent European Integrated Maritime Policy, known as the Blue Book (2007), shortly followed by the new Marine Strategy Framework Directive (2008/56/EC). It is recognized that management should take into account the processes taking place within, and the interactions between ecological, social and economic systems to be effective and sustainable. Yet a quantitative knowledge about such processes and the interactions between marine ecosystems and socio-economic systems is often weak or lacking. The goal of th

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2

Raccagni, Monica. "Organic nitrogen uptake by marine algae : consequences for marine ecosystem functioning and biodiversity." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/12816.

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Dissolved organic nitrogen (DON) represents a major pool of fixed, reactive nitrogen in marine systems. It is now recognized that this pool can support primary production and the ability of some algal species to exploit DON compounds as sources of Nitrogen (N) may indicate that specific DON components can exert selective pressure on the composition of the phytoplankton community. In this study the ability of monocultures of ecologically-relevant algal species from the English Channel (Emiliania huxleyi, Micromonas pusilla, Alexandrium minutum and Chaetoceros peruvianus) to grow with DON as the

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3

Libralato, Simone <1973&gt. "Marine ecosystem functioning analysed by means of indicators and models." Doctoral thesis, Università Ca' Foscari Venezia, 2004. http://hdl.handle.net/10579/647.

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4

Thiere, Geraldine. "Biodiversity and ecosystem functioning in created agricultural wetlands." Doctoral thesis, Högskolan i Halmstad, Våtmarkscentrum, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2968.

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This doctoral dissertation was produced in a cooperation between Halmstad University (Wetland Research Centre, School of Business and Engineering) and Lund University (Limnology & Marine Biology, Department of Ecology). Abstract . Wetland creation at large, regional scales is implemented as a measure to abate the biodiversity loss in agricultural landscapes and the eutrophication of watersheds and coastal areas by non-point source nutrient pollution (mainly nitrogen). The consequences of creating many new wetlands for biodiversity conservation and nutrient reten- tion (ecosystem functionin

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5

Townsend, Michael. "Biodiversity and ecosystem functioning : exploring the relationship for subtidal marine benthic fauna." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495912.

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6

Vye, Siobhan R. "Disentangling the effects of multiple anthropogenic stressors on marine biodiversity and ecosystem functioning." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676606.

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7

Spivak, Amanda C. "Bottom-up and top-down controls on sedimentary ecosystem functioning in a seagrass habitat." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539616861.

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Coastal seagrass ecosystems are complex habitats that are increasingly influenced by human perturbations. Disturbances that affect the strength of bottom-up (i.e. resource availability) and top-down (i.e. consumer) controls may also influence biomass distribution between trophic levels, sediment biogeochemistry, and seagrass ecosystem metabolism. Here, I experimentally tested how top-down and bottom-up perturbations interact with community structure (diversity, food chain length of epibenthic consumers) to alter sediment biogeochemistry and ecosystem metabolism in an experimental eelgrass (Zos

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8

Davies, Thomas Wynter. "Biodiversity and ecosystem funtioning in coastal marine communities towards predicting the consequences of extinction for ecosystem functioning in natural assemblages." Thesis, Bangor University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540410.

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9

Petani, Bruna. "Global change impacts on marine biodiversity and ecosystem functioning: a comparison between mesocosm and in situ studies." Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/243064.

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I cambiamenti climtici minacciano la biodiversità, il funzionamento degli ecosistemi e la vita umana su scala globale. Gli oceani mitigano l'impatto dei cambiamenti globali dovuti alle attività umane, ma diversi fattori di stress, come variazioni di temperatura, acidificazione, scioglimento dei ghiacci e deossigenazione, minacciano i sistemi marini. Studi recenti hanno svelato impatti negativi dovuti a singoli fattori di stress, ma gli effetti sinergici di più fattori di stress concomitanti sono largamente sconosciuti, soprattutto per i sistemi bentonici marini. Inoltre, le attuali evidenze si

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10

Colla, Silvia <1987&gt. "Structure and functioning of the Northern Adriatic coastal ecosystem, within the context of the Marine Strategy Framework implementation." Doctoral thesis, Università Ca' Foscari Venezia, 2016. http://hdl.handle.net/10579/10338.

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The Northern Adriatic Sea summarizes all different critical elements of a ‘typical’ coastal area, such: important trawling activity in the inshore area, presence of aquaculture activities (mussels farms), widely distributed along the coast, presence of small scale fisheries activities, seaside touristic pressures, extended seaport activities. Among these pressures the project aims to investigate acquaculture and small scale fisheries activities within three miles from the coast. This would provide a better understanding of major impact sources and an identification of the processes that need t

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11

Mensens, Christoph. "Biodiversity and ecosystem functioning in stressed environments : primary producers and consumers at the basis of marine food webs." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066736/document.

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La biodiversité est de plus en plus modifiée par les activités humaines, ce qui a conduit à des recherches considérables sur l'effet de la biodiversité sur le fonctionnement des écosystèmes. Ces recherches ont cependant rarement inclu le stress anthropogénique qui cause la perte de biodiversité. Cette thèse analyse l'impact du stress (pesticides et métaux lourds) sur la relation entre la biodiversité et le fonctionnement des écosystèmes à la base de la chaîne alimentaire marine, avec des producteurs marins primaires (diatomées) et leurs principaux consommateurs (copépodes). Le premier résultat

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12

Mensens, Christoph. "Biodiversity and ecosystem functioning in stressed environments : primary producers and consumers at the basis of marine food webs." Electronic Thesis or Diss., Paris 6, 2016. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2016PA066736.pdf.

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La biodiversité est de plus en plus modifiée par les activités humaines, ce qui a conduit à des recherches considérables sur l'effet de la biodiversité sur le fonctionnement des écosystèmes. Ces recherches ont cependant rarement inclu le stress anthropogénique qui cause la perte de biodiversité. Cette thèse analyse l'impact du stress (pesticides et métaux lourds) sur la relation entre la biodiversité et le fonctionnement des écosystèmes à la base de la chaîne alimentaire marine, avec des producteurs marins primaires (diatomées) et leurs principaux consommateurs (copépodes). Le premier résultat

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13

Jonsson, Micael. "Investigations of species richness effects on ecosystem functioning using stream-living macroinvertebrates as model organisms." Doctoral thesis, Umeå : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-164.

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14

Arias, del Real Rebeca. "Effects of frequency and duration of flow intermittence on biodiversity and ecosystem functioning: insights form Mediterranean streams." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/672714.

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Intermittent rivers and ephemeral streams (IRES) are watercourses that naturally and periodically cease to flow. They represent more than half of the global river network and are expanding due to global change. In this thesis, I investigate the mechanisms linking flow intermittence with biodiversity and ecosystem functioning, which sustain biogeochemical cycles and energy transfer in the system. Chapter 1 analyzes the effects of hydrology, micro-habitat (surface and subsurface zones) and biotic features on organic matter decomposition and fungal biomass, in 20 streams. In Chapter 2, I assess t

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15

Beltrand, Maeva Mereana Marion. "The effects of the macroalga Gracilaria gracilis and increasing temperatures on the performance of the endemic Cape eelgrass Zostera capensis." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27537.

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Rising temperature caused by global warming alters physiology, phenology and/or distribution in a wide array of plant and animal species, which has dramatic knock-on effects at different levels of organisation. This study investigates the individual and interactive effects of temperature (18ᵒC, 22ᵒC and 30ᵒC) and additions of the macroalga Gracilaria gracilis (high and low) on the performance of the seagrass Zostera capensis, which occurs in Langebaan Lagoon, South Africa over a seven-week period. Results from the laboratory experiment revealed that G. gracilis did not significantly affect the

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16

Neven, Carolin Julie. "Different perspectives on zooplankton functioning in the Southern North Sea and the English Channel in relation to lower and higher trophic levels." Electronic Thesis or Diss., Littoral, 2024. http://www.theses.fr/2024DUNK0721.

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La compréhension du fonctionnement des écosystèmes est important pour prédire, gérer et protéger les écosystèmes dans lesquels nous vivons et dont nous dépendons. Cette thèse y apporte une contribution en scrutant le compartiment zooplanctonique, qui joue un rôle crucial - quoiqu'encore largement méconnu - dans le fonctionnement des écosystèmes marins, et plus particulièrement les cycles biogéochimiques et le transfert trophique. La présente thèse propose trois perspectives différentes sur le fonctionnement du zooplancton, centrées sur la composition taxonomique (chapitre 1), la structuration

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17

Guibourd, de Luzinais Vianney. "L'impact des vagues de chaleurs marines sur le fonctionnement des écosystèmes de l'océan à l'échelle mondiale." Electronic Thesis or Diss., Rennes, Agrocampus Ouest, 2024. http://www.theses.fr/2024NSARH121.

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Le changement climatique affecte de plus en plus la vie marine. Les vagues de chaleur marines (MHWs), liées au réchauffement, devraient augmenter en durée, intensité et fréquence, amplifiant leurs impacts sur les écosystèmes marins au 21e siècle. Cette thèse explore les effets du changement climatique et des MHWs sur les flux de biomasse dans les réseaux trophiques marins et leurs conséquences sur la structure et le fonctionnement des écosystèmes. J’ai développé EcoTroph-Dyn, une version dynamique du modèle EcoTroph, représentant le fonctionnement des écosystèmes marins comme un flux de biomas

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18

Langenheder, Silke. "Links Between Structure and Function of Heterotrophic Aquatic Bacterial Communities." Doctoral thesis, Uppsala : Department of Ecology and Evolution : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4809.

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19

Sorman, Melanie Grace. "Food Web Restructuring During the Mesozoic Marine Revolution: Did Predators Get Better and Badder or Just Bigger?" Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1556817143491278.

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20

Colléter, Mathieu. "Fishing impacts on the trophic functioning of marine ecosystems, a comparative approach using trophodynamic models." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/51941.

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Faced with the global overexploitation of marine resources and the rapid degradation of ecosystems’ integrity, many states agreed to the principle of an ecosystem approach to fisheries (EAF). In fact, overfishing induces strong decrease of targeted species biomass, which impact predators, their competitors, prey, and ultimately the ecosystems’ trophic networks. Thus, it is an important challenge to understand the trophic functioning of marine ecosystems and the related impacts of fisheries. In this spirit, my thesis was developed to address concerns about the potential impacts of fisheries on

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21

Treviño, Jessica Marie. "Effects of Macrophyte Functional Diversity on Taxonomic and Functional Diversity and Stability of Tropical Floodplain Fish Assemblages." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804900/.

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Multiple dimensions of biodiversity within and across producer and consumer guilds in the food web affect an ecosystem’s functionality and stability. Tropical and subtropical aquatic ecosystems, which are extremely diverse, have received much less attention than terrestrial ecosystems in regards to the effects of biodiversity on ecosystem functioning. We conducted a field experiment that tested for effects of macrophyte functional diversity on diversity and stability of associated fish assemblages in floodplain lakes of the Upper Paraná River floodplain, Brazil. Three levels of macrophyte fun

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22

Karasiewicz, Stéphane. "The phytoplankton community response(s) to global changes and their effect(s) on ecosystem functioning with a special focus on Phaeocystis spp, a harmful algae." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10191/document.

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Les écosystèmes côtiers, interface entre terre et mer, sont soumis au changement climatique ainsi qu’à de fortes pressions anthropiques. Par conséquent, les eaux côtières sont sujettes à eutrophisation. Le phytoplancton demande une attention particulière dû à son rôle de producteur primaire des écosystèmes marins. Récemment, l’efflorescence des algues nuisibles est devenue mondialement, une inquiétude croissante. Le but de la thèse a été de décrire et de mesurer les réponses temporelles et les causalités de la structure de communauté phytoplanctonique sous impact des changements globaux, en pr

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23

DE, LA FUENTE MANCEBO GINA. "Structure and functioning of Cystoseira (Fucales) populations. An applicative study to assess their relevance for marine coastal ecosystems and for human well-being, in a conservation and restoration perspective." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/930629.

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Structure and functioning of Cystoseira (Fucales) populations. An applicative study to assess their relevance for marine coastal ecosystems and for human well-being, in a conservation and restoration perspective

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24

Houitte, de La Chesnais T. "Role of cephalopods in the structure and functioning of marine ecosystems." Thesis, 2019. https://eprints.utas.edu.au/31942/1/Houitte_de_la_Chesnais_whole_thesis.pdf.

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An increase in cephalopod abundance worldwide has been observed over recent decades, possibly a function of cephalopods’ response to the effects of climate change and the reduction in predation by human exploitation on predators of marine systems. Additionally, there has been a renewal of fisheries interest due to the development of markets for cephalopod products and the reduction of finfish stocks. Assessing their role in food webs is thus essential for understanding and anticipating upcoming changes in ecosystem functioning and services. From this perspective, ecosystem models can be used a

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25

Cisneros, Kelly Ortega. "Ecosystem functioning of selected estuaries on the east coast of South Africa." Thesis, 2013. http://hdl.handle.net/10413/11207.

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River inflow is one of the most important factors influencing the density and biomass of estuarine biotic communities. The aim of this study was to obtain an understanding of the ecosystem functioning of selected estuaries on the east coast of South Africa and to represent their dynamics through ecosystem models. The responses of water column nutrients, plankton density and biomass to inlet phase changes for 16 temporarily open/closed estuaries (TOCEs) in South Africa were first determined. This analysis demonstrated that inlet phase and the duration of mouth closure were the most important fa

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26

Pinto, Fátima de Carvalho Vaz. "Invasive marine macroalgae - community invasibility, invasion process, and their ecological role in the ecosystem functioning." Doctoral thesis, 2013. https://repositorio-aberto.up.pt/handle/10216/73448.

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27

Pinto, Fátima de Carvalho Vaz. "Invasive marine macroalgae - community invasibility, invasion process, and their ecological role in the ecosystem functioning." Tese, 2012. https://repositorio-aberto.up.pt/handle/10216/73448.

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28

Maas, Bea. "Birds, bats and arthropods in tropical agroforestry landscapes: Functional diversity, multitrophic interactions and crop yield." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E77-5.

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