Дисертації з теми "Macroalgae communities"
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Hyslop, Brian T. "The effects of colliery waste on littoral species and communities." Thesis, University of Sunderland, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320539.
Повний текст джерелаBoller, Michael Louis. "Hydrodynamics of marine macroalgae : biotic and physical determinants of drag /." View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3188836.
Повний текст джерелаAlbakosh, Mouna Abdalhamed. "Identification and characterization of microorganisms associated with marine macroalgae Splachnidium rugosum." University of the Western Cape, 2014. http://hdl.handle.net/11394/4711.
Повний текст джерелаMarine macroalgae are known to carry diverse bacterial communities which interact with their hosts in both harmful and beneficial ways. Algae hosts provide the bacteria with a rich source of carbon in the form of carbohydrate polysaccharides such as fucoidan, agar and alginate, which the bacteria enzymatically degrade. Splachnidium rugosum is a brown alga (Phylum: Phaeophyta) that grows exclusively in the Southern Hemisphere along the temperate shores of South Africa, New Zealand and Australia. While several studies have investigated S. rugosum distribution and fucoidan production, the microbiome of S. rugosum remains largely uncharacterized. Thus, the major objective of the present study was to isolate, identify and characterize epiphytic bacterial communities associated with S. rugosum. Algae were sourced from Rooi Els (Western Cape, South Africa) during winter 2012. Culture based methods relied on a range of selective marine media including marine agar, nutrient sea water agar, nutrient agar and thiosulfate-citrate-bile-salts-sucrose agar to determine the composition and uniqueness of bacterial communities associated with S. rugosum. Epiphytic isolates were identified to species level by 16S rRNA gene sequence analysis and encompassed 39 Gram-negative and 2 Grampositive bacterial taxa. Isolates were classified into four phylogenetic groups, Gamma - Proteobacteria, Alpha-Proteobacteria, Firmicutes and Bacteriodetes. Bacteria belonging to the phylum Gamma-Proteobacteria were the most abundant, with Vibrio and Pseudoalteromonas being the dominant genera. Three isolates with low sequence identity (˂97%) to their closest relatives could possibly represent novel species. These isolates were grouped into the genera Shewanella, Sphingomonas and Sulfitobacter. All bacterial isolates (41) were screened for antimicrobial activity against the following test strains: Escherichia coli, Bacillus cereus, Staphylococcus epidermidis, Mycobacterium smegmatis Micrococcus luteus and Pseudomonas putida. Fifteen isolates (36%) displayed antimicrobial activity against one or more of the test strains, while one isolate (Pseudomonas species) showed broad spectrum antimicrobial activity against all the test strains except for E. coli. This study provides the first account of the diversity and composition of bacterial populations on the surface of S. rugosum, and demonstrates the ability of these bacteria to produce antimicrobial compounds. Despite recent advances in metagenomics, this study highlights the fact that traditional culturing technologies remain a valuable tool for the discovery of novel bioactive compounds of bacterial origin.
Baggini, Cecilia. "Assessing the effects of long-term ocean acidification on benthic communities at CO2 seeps." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3321.
Повний текст джерелаGilby, Ben L. "Variability in Marginal Coral Reef Communities: Implications for Marine Protected Area Management." Thesis, Griffith University, 2015. http://hdl.handle.net/10072/367997.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Young, John J. "Experimental harvests of macroalgae along the Oregon coast with an analysis of associated epiphytic diatom communities." Thesis, Thesis (M.S.)--University of Oregon, 2003, 2003. http://hdl.handle.net/1794/10076.
Повний текст джерелаQvarfordt, Susanne. "Phytobenthic communities in the Baltic Sea - seasonal patterns in settlement and succession." Doctoral thesis, Stockholm : Department of Systems Ecology, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1153.
Повний текст джерелаDuran, Alain. "Effects of Multiple Ecological Drivers on Recruitment and Succession of Coral Reef Macroalgal Communities." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/905.
Повний текст джерелаWallenstein, Faria e. Maia de Macedo Francisco Luis. "Rocky shore macroalgae communities of the Azores (Portugal) and the British Isles : a comparison for the development of ecological quality assessment tools." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2437.
Повний текст джерелаAzcona, Alexandra. "The Use of Stable Isotopes to Assess Potential Effects of Algal Blooms on Seagrass and Macroalgae Communities in the Indian River Lagoon, Florida." Honors in the Major Thesis, University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1573.
Повний текст джерелаB.S.
Bachelors
Biology
Sciences
Prinsloo, Shireen. "The distribution and diversity of macroalgae in selected estuaries along the Eastern Cape coast of South Africa." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1012314.
Повний текст джерелаBurel, Thomas. "Effet de l'hydrodynamisme sur la structure des communautés macroalgales et sur les interactions macroflore / macrofaune en zone intertidale." Thesis, Brest, 2020. http://www.theses.fr/2020BRES0019.
Повний текст джерелаThis thesis aims at quantifying and explaining the effects of hydrodynamics on the communities of the North-East Atlantic rocky shores. In that prospect, several studies were carried out in 14 sites at the western head of Brittany, at different spatial scales, from a few metres to a hundred kilometres. Two biological sampling methods were used for macroflora and macrofauna to study variations in the structure of macroalgal communities and seaweed dominated assemblages. A new proxy for small-scale hydrodynamics has been developed, in situ wave height.In situ wave height appears to be the most important physical factor in the internal structuring of macroalgal communities. By studying the differentiation of six macroalgal communities vertically distributed on the shore, the role of hydrodynamics seems to be minor compared to the elevation and the average duration of emersion.The shift in intertidal dominance from macroflora to macrofauna is mainly explained by in situ wave height. Sessile organisms respond differently to hydrodynamics. Interestingly, the existence of tolerance thresholds for hydrodynamics was highlighted. Within the communities dominated by macroalgae, the in situ wave height significantly modulates both the fauna-flora interactions, strong at the top and middle of the shore, and the flora-flora interactions, more important at the bottom of the intertidal zone.Studying the effect of hydrodynamics on a midintertidal macroalgal community using seven proxies revealed different community responses. The wave heights measured in situ and calculated using theSWAN model appear to be complementary in assessing the role of hydrodynamics in the structuring of macroalgal-dominated rocky intertidal ecosystems
Collings, Greg. "Spatiotemporal variation of macroalgal communities of southern Fleurieu Peninsula, South Australia /." Title page, table of contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phc711.pdf.
Повний текст джерелаTurner, David John. "Effects of sedimentation on the structure of a phaeophycean dominated macroalgal community." Connect to this title online, 2004. http://hdl.handle.net/2440/37702.
Повний текст джерелаThesis (Ph.D.)--School of Earth and Environmental Sciences, 2004.
Monserrat, Barcelo Margalida. "Régression des forêts marines : causes et effets dans le cadre de leur conservation et restauration." Electronic Thesis or Diss., Université Côte d'Azur, 2023. http://www.theses.fr/2023COAZ4011.
Повний текст джерелаLarge brown forest-forming macroalgae are dominant foundation species, ecosystem engineers of marine macroalgal forests. In the Mediterranean Sea, they are mainly represented by Cystoseira sensu lato spp. most of wich are endemic. They are also characterized for being long-lived species with short dispersal of the zygotes. Marine forests are one of the most productive and diverse ecosystems on earth. However, anthropogenic impacts are pushing them to the edge, causing regime shifts towards less complex communities such as shrubs, turfs, or even barren grounds. Marine forest loss affects the whole ecosystem, eventually making it more vulnerable to emergent phenomena such as benthic harmful algal blooms (BHAB). BHAB of the genus Ostreopsis spp. have been expanding in recent decades through temperate regions such as the Mediterranean Sea, where they have important public health, ecological and economic consequences. Major blooms are generally observed on macroalgal turfs and shrubs, suggesting that less structurally complex macroalgal communities could have an active role in promoting the proliferation of blooms.The main objectives of this thesis are (i) to assess some abiotic (climate change) and biotic (herbivory) causes of marine forests loss in the Mediterranean Sea and (ii) the potential consequences this loss can have in the context of BHABs proliferation. In the first two chapters, the causes of Cystoseira s.l. spp. loss were assessed. In Chapter 1, the effects of climate change and species facilitation on the recruitment of Cystoseira compressa were studied in controlled laboratory experiments. The major results from this chapter show that the interactive effects of ocean warming and acidification negatively affect C. compressa recruits, which are also negatively affected by the presence of crustose coralline algae. In Chapter 2 the grazing pressure and the effects of different invertebrates on recruits of C. compressa were assessed through field surveys and both field and laboratory-based experiments. The results obtained show a high grazing rate of several common invertebrate species (molluscs, decapods et isopods) on recruits of C. compressa, representing a threat to natural populations in the long term, but also affecting the success of restoration actions. In chapters 3 and 4 the consequences of forest loss and in particular, the facilitation of Ostreopsis spp. blooms was approached by a literature review and field experiments. The review, reported in Chapter 3, focussed on the role of habitat in the facilitation of Ostreopsis spp. blooms. Despite an evident lack of information at the global scale on the meso- and macro-habitat fostering Ostreopsis spp. blooms, the present knowledge suggests a relationship between the abundance of Ostreopsis spp. and the complexity of the macroalgal communities. In Chapter 4 Ostreopsis spp. blooms have been studied in relation to macroalgal communities in field experiments in Italy and in France. A high variability on Ostreopsis spp. abundances was observed in the different macroalgal species and communities sampled, in some cases likely hiding other potential patterns of Ostreopsis spp. preferences. Larger scale studies would be needed to confirm these results.These findings provide important insights into the causes and effects of Cystoseira s.l. spp. loss and are of major interest for the conservation of Mediterranean marine forests, contributing to the development of effective management measures. The results presented support the importance of marine forests restoration in the Mediterranean Sea, as recommended by the 2030 European Biodiversity Strategy, the United Nations Decade on Ecosystem Restoration and the 2030 Agenda for Sustainable Development objectives. Such restoration actions will not only increase the productivity and biodiversity of coastal ecosystems but could potentially mitigate the public health, ecological and economic consequences of Ostreopsis spp. blooms
Catania, Daniela. "L'influence des macroalgues sur la prolifération et la régulation des efflorescences du dinoflagellé benthique Ostreopsis cf. ovata." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4083/document.
Повний текст джерелаAlgal blooms can be harmful. The global management and forecasting of benthic harmful algal blooms (BHABs) will be of increasing importance in the years ahead and that is what this study sets out to address. The increase over recent decades, in both frequency and geographical range, of the potentially harmful benthic dinoflagellate Ostreopsis cf. ovata can pose real problems for human health. The French Côte d’Azur, the location for this study, is just one of many Mediterranean areas where harmful algal blooms pose a potential economic threat to a tourist-based economy. A review of the existing literature on Ostreopsis spp. blooms shows a severe lack of information about the ecology of O. cf. ovata in relation to biotic substrates, communities and habitats and thus any possible roles these may play in fostering major Ostreopsis spp. blooms. Through a series of in situ experiments on temperate reefs on the Côte d’Azur over the summers of 2015 and 2016 with follow-up experiments in the laboratory, this study establishes that four distinct macroalgal communities harbour different O. cf. ovata abundances. The results indicated that higher abundances were recorded in sites which were dominated by less complex community structures; Turf and Dicyotales, while sites with Cystoseira spp. communities present did not harbour significant microalgal blooms. These results imply that coastal regions with a dominance of Cystoseira-composed-communities could potentially be less prone to blooms or even inhibit Ostreopsis spp. proliferation. Although, no clear relationship was found between inorganic nutrient concentrations and O. cf. ovata abundances, it was observed that in the bloom onset period, nitrogen compounds were higher than in the rest of the study period (both in 2015 and 2016). Multiple human stressors will continue to impact marine vegetation, understanding these impacts and how they then influence bloom dynamics is imperative for the global management and mitigation of BHABs
Churchill, Helen Ruth. "The role of macroalgal morphology and community structure on the accumulation of sediment and the subsequent effects on the dynamics of marine intertidal communities." Thesis, University of Hull, 2009. http://hydra.hull.ac.uk/resources/hull:5760.
Повний текст джерелаMucciarelli, Valerie. "Community assembly in subtidal macroalgal communities: The importance of environmental gradients." Thesis, 2014. http://hdl.handle.net/1828/5302.
Повний текст джерелаGraduate
0329
vmucciar@uvic.ca
Santos, Marisa Alexandra Monteiro Batista dos. "Effects of macroalgae invasive species and temperature on estuarine sediments microbial communities and nitrogen biogeochemistry." Master's thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/77820.
Повний текст джерелаSantos, Marisa Alexandra Monteiro Batista dos. "Effects of macroalgae invasive species and temperature on estuarine sediments microbial communities and nitrogen biogeochemistry." Dissertação, 2014. https://repositorio-aberto.up.pt/handle/10216/77820.
Повний текст джерелаFowles, AE. "Assessing anthropogenic impacts on reef communities: patterns, indicators and processes." Thesis, 2017. https://eprints.utas.edu.au/23842/1/Fowles_whole_thesis.pdf.
Повний текст джерелаMacedo, Francisco Luís Wallenstein Faria e. Maia de. "Rocky shore macroalgae communities of the Azores (Portugal) and the British Isles : a comparison for the development of ecological quality assessment tools." Doctoral thesis, 2011. http://hdl.handle.net/10400.3/1317.
Повний текст джерелаThis thesis focuses on intertidal seaweed communities on rocky shores and was planned to provide solid scientific background for the application of the EU Water Framework Directive (WFD) to the Azores based on the tool developed for British shores. The main structuring factors for rocky shore intertidal communities are briefly described and characterized for each of the two regions. Rocky shore intertidal seaweed communities of the British Isles and the Azores are compared based on presence/absence data recorded in single occasion visits to individual stretches of shore. The existing numerical indices used for the assessment of ecological quality for the WFD in the British Isles and in northern Spain have been tested for Azorean shores and adaptations proposed in order to incorporate differences between regions. A new alternative index is proposed for the Azores and possibly for remaining Macaronesian archipelagos that combines features used in the British Isles and in northern Spain. A first account is given of seaweed communities and their ecological quality classification at two rocky shores affected by shallow water hydrothermal activity. In the Azores, this is the closest to polluted shores, with which to test quality assessment tools. The accumulation of heavy metals in different seaweeds has been quantified and compared between the vicinity of shallow water hydrothermal activity and of urban development in the Azores. The concentration of heavy metals in Fucus spiralis has been compared between samples affected by hydrothermal seeps in the Azores and by acid mine drainage in the British Isles. Preliminary culture experiments provide an insight on the influence of temperature and acidity on the growth and photosynthesis of F. spiralis, as measures of metal accumulation capacity of this species.
FCT - Fundação para a Ciência e Tecnologia (SFRH/BD/27466/2006)
Short, George. "Variations in reef-associated fish communities in response to different benthic states in the east central Red Sea." Thesis, 2019. http://hdl.handle.net/10754/656295.
Повний текст джерелаFulton, Stella Elaine. "Effects of macroalgal removal on inshore coral reef communities and sedimentation dynamics." Thesis, 2022. https://researchonline.jcu.edu.au/77023/1/JCU_77023_Fulton_2022_thesis.pdf.
Повний текст джерелаNicholls, David John. "Eutrophication and excessive macroalgal growth in Lake Macquarie, New South Wales." 1999. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20001003.155914/index.html.
Повний текст джерелаCollings, Gregory James. "Spatiotemporal variation of macroalgal communities of southern Fleurieu Peninsula, South Australia / by Gregory James Collings." Thesis, 1996. http://hdl.handle.net/2440/18910.
Повний текст джерела2 v. : ill. (some col.), maps ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
The temporal dynamics of eight subtidal mixed macroalgal communities were quantified. The results were discussed in terms of the implications for sampling programs in the future and the reliability of previous work.
Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1997?
Collings, Gregory James. "Spatiotemporal variation of macroalgal communities of southern Fleurieu Peninsula, South Australia / by Gregory James Collings." 1996. http://hdl.handle.net/2440/18910.
Повний текст джерела2 v. : ill. (some col.), maps ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
The temporal dynamics of eight subtidal mixed macroalgal communities were quantified. The results were discussed in terms of the implications for sampling programs in the future and the reliability of previous work.
Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1997?
Azevedo, Jonas de. "What has changed in the macroalgal communities of the Portuguese coast over a 6-year period?" Master's thesis, 2019. https://hdl.handle.net/10216/125820.
Повний текст джерелаAzevedo, Jonas de. "What has changed in the macroalgal communities of the Portuguese coast over a 6-year period?" Dissertação, 2019. https://hdl.handle.net/10216/125820.
Повний текст джерела