Дисертації з теми "Seagrasse"
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Mvungi, Esther Francis. "Seagrasses and Eutrophication : Interactions between seagrass photosynthesis, epiphytes, macroalgae and mussels." Doctoral thesis, Stockholms universitet, Botaniska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-55808.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Papers 1, 3 and 4: Submitted. Paper 2: Manuscript.
Swedish Agency for Research Cooperation (Sida/SAREC) marine bilateral programme
Uku, Jacqueline. "Seagrasses and their epiphytes : Characterization of abundance and productivity in tropical seagrass beds." Doctoral thesis, Stockholm University, Department of Botany, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-527.
Повний текст джерелаSeagrass beds cover large intertidal and subtidal areas in coastal zones around the world and they are subjected to a wide variety of anthropogenic influences, such as nutrient enrichment due to sewage seepage. This study was undertaken to address specific questions focusing on whether near shore tropical seagrasses that receive a constant influx of groundwater nutrient inputs, would exhibit a higher productivity and to what extent epiphytic algae reflect the impacts of nutrient inputs. An additional aspect of study was to determine the prevalence of “acid zones” in tropical seagrasses. The productivity of the seagrasses Cymodocea rotundata, Thalassia hemprichii and Thalassodendron ciliatum was compared in two sites along the Kenyan coast; Nyali (a high nutrient site) and Vipingo (a low nutrient site). Of the three seagrasses T. hemprichii showed the most distinct differences with higher growth and biomass in the nutrient rich site whereas the growth of C. rotundata was similar in the two sites. A high epiphytic cover was found on the shoots of T. ciliatum found in the high nutrient site Nyali.
Morphological and genetic characterization of bacterial and cyanobacterial epiphytes showed specific associations of nitrogen fixing cyanobacteria on the seagrass C. rotundata in the low nutrient site (Vipingo). At this site, shoots of C. rotundata had a higher C:N ratio compared to shoots in the high nutrient site (Nyali) indicating that the association with nitrogen fixing cyanobacteria is a strategy, for this species, to meet its nutrient needs. Bacterial epiphytes belonging to the group Cytophaga-Flavobacteria-Bacteroides (CFB) were found on T. ciliatum and T. hemprichii from the two sites. CFB bacteria are characteristic of waste water, particularly from livestock farming areas, thereby confirming seepage of groundwater from surrounding catchment areas. These prokaryotic associations were specific for the different seagrasses and it appears that the establishment of epiphytic associations may not be a random encounter but a specific association that meets specific needs.
The seagrass T. ciliatum in the high nutrient site had an abundance of macroalgal epiphytes and the impact of the epiphytic coverage was assessed using Pulse Amplitude Modulated (PAM) fluorometry. The photosynthetic activity of seagrass parts that were covered by epiphytes was suppressed but the productivity of the whole shoot was not significantly reduced. In the nutrient rich site, epiphytes were found to contribute up to 45% of the total estimated gross productivity, during the SE monsoon season, while epiphytic contribution in the nutrient poor site, was 8%. Epiphytic abundance and contribution to productivity decreased during the NE monsoon. The photosynthetic activity of T. ciliatum shoots was similar in the two study sites with shoots in the nutrient rich site growing faster. T. ciliatum, in the low nutrient site, invested in the development of below ground root tissue which may indicate the development of a strategy to gain access to pore water nutrient pools.
Carbon uptake strategies of eight tropical seagrasses were re-evaluated to determine how common the “acid zone” mechanism is among tropical seagrasses. Six of the eight species studied showed photosynthetic inorganic carbon (Ci) acquisition based on carbonic anhydrase catalysed HCO3- to CO2 conversions within an acidified diffusion boundary layer (“acid zone”). Cymodocea serrulata appeared to maintain its carbon uptake by extracellular carbonic anhydrase catalysed CO2 formation from HCO3- without the need for acidic zones, whereas, Halophila ovalis appeared to have a system in which H+ extrusion may be followed by HCO3--H+ co-transport into the cells. These findings indicate that competition for carbon, between the host seagrass species and epiphytes, could determine seagrass-epiphyte associations.
Uku, Jacqueline Nduku. "Seagrasses and their epiphytes : characterization of abundance and productivity in tropical seagrass beds /." Stockholm : Dept. of Botany, Stockholm university, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-527.
Повний текст джерелаWicks, Elinor Caroline. "The effect of sea level rise on seagrasses is sediment adjacent to retreating marshes suitable for seagrass growth? /." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/3277.
Повний текст джерелаThesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Horn, Lotte E. "The measurement of seagrass photosynthesis using pulse amplitude modulated (PAM) fluorometry and its practical applications, specifically in regard to transplantation /." Access via Murdoch University Digital Theses Project, 2006. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061123.150231.
Повний текст джерелаMoore, Althea F. P. "The Effects of Seagrass Species and Trophic Interactions in Experimental Seagrass Communities." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539617911.
Повний текст джерелаKilminster, Kieryn Lee. "Biogeochemical constraints on the growth and nutrition of the seagrass Halophila ovalis in the Swan River Estuary." University of Western Australia. School of Plant Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0016.
Повний текст джерелаMcMahon, Kathryn. "Recovery of subtropical seagrasses from natural disturbances /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19102.pdf.
Повний текст джерелаTadkaew, Nichanan. "Monitoring of seagrasses in Lake Illawarra, NSW." Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070821.142240/index.html.
Повний текст джерелаPaxson, Jill C. "Branching frequency of Thalassia testudinum (Banks ex König) as an ecological indicator in Florida Bay /." Electronic version (PDF), 2003. http://dl.uncw.edu/etd/2003/paxsonj/jillpaxson.pdf.
Повний текст джерелаArpayoglou, Irene. "Cultivation of Wrack Collected Seagrasses." NSUWorks, 2004. http://nsuworks.nova.edu/occ_stuetd/285.
Повний текст джерелаau, keulen@murdoch edu, and Michael van Keulen. "Water Flow in Seagrass Ecosystems." Murdoch University, 1998. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040518.91242.
Повний текст джерелаvan, Keulen Michael. "Water flow in seagrass ecosystems." Thesis, van Keulen, Michael ORCID: 0000-0001-6235-5788 (1998) Water flow in seagrass ecosystems. PhD thesis, Murdoch University, 1998. https://researchrepository.murdoch.edu.au/id/eprint/377/.
Повний текст джерелаvan, Keulen Michael. "Water flow in seagrass ecosystems." van Keulen, Michael (1998) Water flow in seagrass ecosystems. PhD thesis, Murdoch University, 1998. http://researchrepository.murdoch.edu.au/377/.
Повний текст джерелаMoniruzzaman, Md. "Seagrass detection using deep learning." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2019. https://ro.ecu.edu.au/theses/2261.
Повний текст джерелаKahn, Amanda E. "Physiological ecology of the seagrass Halophila Johnosnii Eiseman in marine and riverine influenced environments." View electronic thesis, 2008. http://dl.uncw.edu/etd/2008-3/r1/kahna/amandakahn.pdf.
Повний текст джерелаHernán, Martínez Gema. "Defense strategies against herbivory in seagrasses." Doctoral thesis, Universitat de les Illes Balears, 2017. http://hdl.handle.net/10803/565412.
Повний текст джерела[spa]Introducción: El herbivorismo es un proceso ecológico clave que regula la composición y estructura de las comunidades de plantas y determina la transferencia de energía de productores primarios al resto de la cadena trófica. Las plantas han desarrollado diversos mecanismos de defensa para evitar o resistir el herbivorismo. Entre ellos están las estrategias tolerancia, que disminuyen el efecto del herbivorismo en la vitalidad de la planta (ej. acumulación de reservas en tejidos subterráneos) y las estrategias de resistencia cuyo objetivo es evitar el consumo (ej. aumento del contenido en fibra). Estas estrategias se basan en características morfológicas (ej. dureza) y químicas de las plantas (ej. defensas químicas) y pueden expresarse de forma continua (constitutivas) o en respuesta al daño por herbívoros (inducidas). El herbivorismo en el medio marino puede ser mayor que en sistemas terrestres y puede tener importantes consecuenc ias cuando afecta a especies formadoras de hábitat Las fanerógamas marinas son especies fundadoras dominantes en zonas someras costeras que nos proporcionan múltiples e importantes servicios. Debido a su relevancia ecológica y socioeconómica, profundizar en el conocimiento de las interacciones planta-herbívoro en estos ecosistemas es crucial pues existen cada vez más ejemplos que indican que cambios en las poblaciones de herbívoros han supuesto importantes perturbaciones en dichos ecosistemas. El propósito principal de esta tesis es entender cómo cambios en factores ambientales determinan la variación de las estrategias de defensa y palatabilidad de la planta, y por tanto el comportamiento de los herbívoros. Contenido La disponibilidad de nutrientes destaca por sus efectos sobre las características químicas y morfológicas de las plantas ya que aumenta el valor nutritivo y disminuye el contenido en fibras de las hojas tanto en experimentos de fertilización como en regiones con mayor disponibilidad de nutrientes, lo cual las puede hacer más vulnerables al consumo por herbívoros. La simulación del daño por herbívoros afecta a las estrategias de defensa de las plantas de forma diferente en las dos especies estudiadas. Mientras que en Posidonia oceanica se induce la producción de compuestos de resistencia, en Zostera marina no hay inducción disminuyendo además su resistencia y tolerancia. Esto se traduce en que los herbívoros prefieren las hojas más nutritivas repetidamente recortadas de Z. marina y las hojas sin recortar con menos fibras y más nutrientes de P. oceanica. Los cambios ambientales relacionados con el cambio global analizados en esta tesis (aumento del CO2 y de la temperatura), tienen importantes efectos en las plántulas de P. oceanica. El aumento del CO2 disuelto aumenta la actividad fotosintética de la planta y con esto las reservas de carbohidratos de las semillas. A pesar de que el aumento de CO2 disminuye la calidad nutricional de las hojas, éstas fueron las preferidas por los herbívoros, posiblemente debido al aumento de sacarosa o por otras características no analizadas en las plántulas. Al contrario que el aumento de CO2, el incremento de la temperatura produce efectos claramente negativos aumentando la mortalidad, la respiración y uso de las reservas de la semilla en estas plántulas. Además, disminuye el contenido en fibras de las hojas reduciéndose la resistencia frente al herbivorismo y aumentando por tanto la preferencia por herbívoros. Estos resultados muestran los potenciales efectos aditivos que el herbivorismo puede suponer en los impactos de los cambios ambientales en las poblaciones de plantas marinas. Conclusión La investigación presentada en esta tesis contribuye a entender los mecanismos que influyen en los cambios de las estrategias de defensa frente al herbivorismo. Principalmente, en cómo estos mecanismos cambian bajo diferentes condiciones ambientales y como los cambios en las características asociadas a resistencia frente a herbívoros determinan la vulnerabilidad de la planta frente al herbivorismo. Además, destaca la importancia de evaluar los efectos de los cambios ambientales sobre las interacciones entre especies.
[eng]Introduction Herbivory is a key ecological process that regulates the composition and structure of plant communities and determines the energy transferred from primary producers to upper trophic levels. Plants have evolved a suite of defense strategies to avoid or resist herbivory. Tolerance strategies reduce the impact of herbivory in plant fitness (e.g., increased belowground reserves), and resistance strategies reduce preference or performance of the herbivore (e.g., low nutritional quality, high fiber content). These strategies are based on morphological (e.g., toughness) and chemical traits (e.g., phenolic compounds) and can be expressed regardless of the risk of herbivory (constitutively) or in response to herbivore damage (induced). In addition, defense strategies may shift under different environmental scenarios (e.g. higher resource availability often drives a lower investment in resistance). Herbivory in marine systems can be greater than in terrestrial ecosystems, and it can have particularly important consequences when it is exerted upon habitat-forming plants. Seagrasses are key foundation species dominating shallow coastal areas and providing numerous and critical ecosystem services to humans. Given their ecological and socioeconomic relevance, understanding plant-herbivore interactions in these systems is crucial since changes in herbivore populations can result in important disturbances in these ecosystems. The main purpose of this thesis is to understand the effect of changes in environmental factors in plant defense strategies against herbivory and how these changes affect the palatability of the plant, and thus herbivore behavior. Content Nutrient availability stands out for its effects on chemical and morphological plant defense traits. Plants under high nutrient environments in fertilization experiments and regions of higher nutrient availability (i.e. latitudinal comparison) exhibited higher nutritional quality and lower fiber content, both of which can increase their vulnerability to consumption. Interestingly, effects of nutrients on secondary compounds were absent or inconsistent. Simulated herbivory had clear effects on both morphological and chemical plant defense traits, however the two species studied differed in their responses. While in Posidonia oceanica, herbivory induced the production of resistance traits (e.g. fiber, secondary metabolites), in Zostera marina there was no induction of resistance traits, and on the contrary, simulated herbivory reduced their tolerance and resistance. As a result of the changes in traits exhibited by the plants, herbivores preferred the more nutritious repeatedly clipped leaves of Z. marina and the less chemically defended and more nutritious unclipped leaves of P. oceanica. The environmental changes related to global climate change that I analyzed in this thesis (i.e. increased CO2 and temperature), had important effects on defense strategies and susceptibility to grazers of P. oceanica seedlings. The increased pCO2 of seawater enhanced plant photosynthetic activity, leading to higher carbohydrate reserves in the seeds, which are the main storage tissue of the seedling. Although the increase in CO2 decreased leaf nutritional quality (i.e. leaf nitrogen), plants growing under high CO2 were preferred by the herbivores, possibly due to their increase in sucrose content or perhaps other chemical or structural characteristics that were not analyzed. In contrast to CO2, the increase in temperature produced clear negative effects on seedlings; increasing mortality and respiration resulting in greater use of seed reserves. Furthermore, warming reduced leaf fiber, which increased herbivore preference for warmed plants, and thus resulted in a decreased resistance to herbivory. These results illustrate the potential additive or counteractive effects that herbivory could have on determining the effects of environmental changes in seagrass ecosystems. Conclusion The research presented in this thesis contributes to identify the mechanisms that drive the changes in defense strategies against herbivory due to changes in environmental factors. Particularly, how these mechanisms change under different environmental conditions and how changes in traits associated with resistance to herbivores determine the vulnerability of plants to herbivory, highlighting the importance of assessing the effects of environmental factors on species interactions.
DeAmicis, Stacey Lynn. "The long-term effects of Sargassum muticum (Yendo) Fensholt invasion on Zostera marina L. and its associated epibiota." Thesis, University of Plymouth, 2012. http://hdl.handle.net/10026.1/1007.
Повний текст джерелаBridgwood, Samantha. "Seagrass landscapes along a wave gradient." Thesis, Bridgwood, Samantha (2006) Seagrass landscapes along a wave gradient. PhD thesis, Murdoch University, 2006. https://researchrepository.murdoch.edu.au/id/eprint/5118/.
Повний текст джерелаMishra, Amrit Kumar. "Global change effects on seagrass ecosystem." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11296.
Повний текст джерелаWilson, Wendolyn Louise. "Isolation of endophytes from seagrasses from Bermuda." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ35540.pdf.
Повний текст джерелаWaspe, Christopher Themba. "Interactive effects of temperature and grazing by seagrass limpets (Siphonaria compressa and Fissurella mutabilis) on seagrass (Zostera capensis)." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20010.
Повний текст джерелаTarquinio, Flavia. "The role of the seagrass leaf microbiome in assisting nitrogen uptake by the Western Australian seagrass, Posidonia sinuosa." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2017. https://ro.ecu.edu.au/theses/2046.
Повний текст джерелаVivoni-Gallart, Enrique Rafael 1975. "Turbulence structure of a model seagrass meadow." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/35483.
Повний текст джерелаIncludes bibliographical references (p. 235-239).
A laboratory study of the hydrodynamics of a seagrass meadow was conducted to investigate the effect of water depth and velocity variations during a tidal cycle on the mean and turbulent velocity fields in and above the vegetation layer. The principal goal was to characterize the turbulence structure of a depth-limited canopy, a gap that presently exists in the knowledge concerning the interaction of a unidirectional flow with an assemblage of plants. The experiments were carried out in an open channel flume with a model seagrass canopy. Proper modeling of the system for both the geometric and dynamic behavior of natural Zostera marina communities allows the results to be extrapolated to the conditions in a coastal, tidal meadow. The results also serve as an important comparative case to the characterization of turbulence within atmospheric plant canopies. The laboratory study included the measurement of the mean and turbulent velocity fields with the use of an acoustic Doppler velocimeter and a laser Doppler velocimeter. Standard turbulence parameters were evaluated including the velocity moments, the turbulence spectra. the turbulent kinetic energy budget and the quadrant distribution of the Reynolds stress. Each of these provided a means of describing the effect of submergence depth and the degree of canopy waving (monami) on the transport of momentum and mass between the canopy and its surrounding fluid environment. In addition. surface slope measurements were made with surface displacement gauges. the plant motion was quantified using video and camera images. and the canopy morphology was recorded from measurements taken from a random sampling of the model plants. The investigation showed a clear link between the shear generated eddies arising at the interface of the canopy and the surface layer and the vertical exchange of momentum. the plant motion characteristics and the turbulence time and length scales. The turbulence field within the seagrass meadow was composed of a shear-generated turbulence zone near the canopy height and a wake-generated zone near the bed In addition. a mean flow due to the pressure gradient from the water surface slope created a region of secondary maxima in the mean velocity profile near the bed. The parameter determining the seagrass turbulence structure was found to be the characteristic depth (H' h). defined such that the effective canopy height. reflects the plant deflection. Across the range of values considered for H/h. the flow characteristics showed a clear transition from a confined to an unbounded canopy flow. This transition was observed in all the principal turbulence parameters. From this analysis. a critical surface layer depth governing the transition between the two extreme canopy flow conditions was identified as half the effective canopy height. H'h = 1.50.
by Ernique Rafael Vivoni Gallart.
S.M.
Sanmartí, Boixeda Neus. "Biological interactions and resilience of seagrass ecosystems." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/672259.
Повний текст джерелаEl nostre món està sotmès a un ampli ventall de forces que tendeixen a provocar canvis. En aquest context, entendre com la biosfera resisteix, absorbeix o és alterada per aquestes forces resulta una qüestió candent, especialment per l'ecologia. Al respecte, dos conceptes ecològics esdevenen essencials: la resiliència i les interaccions biològiques. La resiliència és la capacitat de persistència o recuperació que tenen els ecosistemes sotmesos a estrès o pertorbacions. Les interaccions entre espècies (efectes de l'existència d'una espècie sobre la fitness d'una altra) contribueixen al manteniment de les funcions ecosistèmiques i, en un cert sentit, constitueixen l'arquitectura de la biodiversitat. A més, la resiliència dels ecosistemes depèn , en gran part, d’aquestes interaccions. Aquesta tesi és un intent d’aprofundir en els aspectes esmentats a través d'una sèrie de casos d’estudi en ecosistemes d’angiospermes marines. Concretament, el que fem és estudiar com els ecosistemes d’angiospermes marines responen a les forces causants de canvis, com aquestes respostes vénen mitjançades per canvis en la interacció entre espècies, i provar d'esbrinar els mecanismes que permeten la coexistència d’espècies que es troben vinculades per interaccions positives i negatives. La nostra aproximació es basa tant en observacions com en experiments en el camp. El Capítol 1 mostra com un increment de matèria orgànica en el sediment debilita el mutualisme entre el bivalve Loripes lucinalis i l’angiosperma marina Cymodocea nodosa. El mecanisme implicat que es proposa per explicar-ho està relacionat amb la plasticitat morfològica de la planta. Així, un increment en la matèria orgànica del sediment (i, probablement, l’anòxia que se'n segueix), fa que la planta modifiqui la morfologia de les seves arrels, que esdevenen molt menys ramificades i fan disminuir per tant la disponibilitat d'hàbitat per als bivalves. Una debilitació del mutualisme pot, potencialment, disminuir la resiliència d’aquests ecosistemes a l’eutrofització i, per tant, comprometre la seva persistència. El Capítol 2 descriu una cascada de facilitació en la qual l’angiosperma marina C. nodosa afavoreix l’abundància del gran bivalve Pinna nobilis, que ajuda a incrementar l'abundància de la garota Paracentrotus lividus, que al seu torn consumeix l’angiosperma. Suggerim que la persistència d’aquest sistema de tres espècies, aparentment inestable (tres interaccions concatenades circularment, dues de positives i una de negativa) es basa en què la interacció negativa (l’efecte de les garotes sobre l’angiosperma) té un abast molt limitat, probablement degut tant al seu comportament alimentari com a les defenses de la planta enfront de l'herbivorisme. Els Capítols 3 i 4 mostren que les espècies de creixement ràpid, com ara C. nodosa, són altament resilients a l'estrès o a les pertorbacions quan aquestes afecten només les parts aèries de les plantes (defoliació parcial o total), recuperant-se ràpidament (dues setmanes) després d'una pertorbació puntual en el temps. C. nodosa mostra diversos mecanismes de tolerància a la defoliació, com ara el creixement compensatori, la reassignació de recursos interns i l’increment en la taxa de formació de nous mòduls. Tanmateix, quan les pertorbacions provoquen la pèrdua de les parts subterrànies (rizomes i arrels), la recuperació és molt més lenta, i triga fins a dos anys. A més, aquesta recuperació depèn de les característiques de la pertorbació com ara la mida de l'àrea afectada i l’època de l'any en què es produeix. En general, aquesta tesi ha contribuït a comprendre millor les respostes dels ecosistemes als canvis. Hem pogut documentar alguns processos que permeten la coexistència entre espècies, així com mecanismes de resiliència específics que esdevenen ecosistèmics quan es manifesten en espècies fundadores d'hàbitat. També hem demostrat com els canvis, més enllà d'afectar espècies individuals més o menys emblemàtiques, poden provocar alteracions de formes més subtils, com ara erosionant la seva resiliència mitjançant la modificació d’interaccions biològiques. Els avenços en totes aquestes direccions complementàries i interrelacionades són crucials per a gestionar i preservar els ecosistemes i evitar el seu possible col·lapse.
Jamaludin, Mohammad Rozaimi. "Carbon storage and preservation in seagrass meadows." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2015. https://ro.ecu.edu.au/theses/1683.
Повний текст джерелаGaus, Caroline, and n/a. "Dioxins in the Marine Environment: Sources, Pathways and Fate of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Queensland, Australia." Griffith University. School of Public Health, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030624.144111.
Повний текст джерелаGaus, Caroline. "Dioxins in the Marine Environment: Sources, Pathways and Fate of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Queensland, Australia." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/367537.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Public Health
Faculty of Health Sciences
Full Text
Nowicki, Robert J. "Effects of Catastrophic Seagrass Loss and Predation Risk on the Ecological Structure and Resilience of a Model Seagrass Ecosystem." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2994.
Повний текст джерелаSamsonova, Maria. "Tropicalisation of temperate seagrass meadows in Western Australia: Predicting the impact of tropical herbivorous fishes on temperate seagrass meadows." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2294.
Повний текст джерелаSmith, Erin. "Heavy Metal Accumulation in Seagrasses in Southeastern Florida." Thesis, NSUWorks, 2018. https://nsuworks.nova.edu/occ_stuetd/474.
Повний текст джерелаWilson, Julia. "In vitro propagation of some Western Australian seagrasses." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2004. https://ro.ecu.edu.au/theses/838.
Повний текст джерелаBridges, Allison. "The effect of model seagrass on wave runup: A laboratory investigation." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 73 p, 2008. http://proquest.umi.com/pqdweb?did=1597632681&sid=8&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаEklöf, Johan S. "Anthropogenic Disturbances and Shifts in Tropical Seagrass Ecosystems." Doctoral thesis, Stockholm University, Department of Systems Ecology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7285.
Повний текст джерелаSeagrasses constitute the basis for diverse and productive ecosystems worldwide. In East Africa, they provide important ecosystem services (e.g. fisheries) but are potentially threatened by increasing resource use and lack of enforced management regulations. The major aim of this PhD thesis was to investigate effects of anthropogenic distur-bances, primarily seaweed farming and coastal fishery, in East African seagrass beds. Seaweed farming, often depicted as a sustainable form of aquaculture, had short- and long-term effects on seagrass growth and abundance that cascaded up through the food web to the level of fishery catches. The coastal fishery, a major subsistence activity in the region, can by removing urchin predators indirectly increase densities of the sea urchin Tripneustes gratilla, which has overgrazed seagrasses in several areas. A study using simulated grazing showed that high magnitude leaf removal – typical of grazing urchins – affected seagrasses more than low magnitude removal, typical of fish grazing. Different responses in two co-occurring seagrass species furthermore indicate that high seagrass diversity in tropical seagrass beds could buffer overgrazing effects in the long run. Finally, a literature synthesis suggests that anthropogenic disturbances could drive shifts in seagrass ecosystems to an array of alternative regimes dominated by other or-ganisms (macroalgae, bivalves, burrowing shrimp, polychaetes, etc.). The formation of novel feedback mechanisms makes these regimes resilient to disturbances like seagrass recovery and transplantation projects. Overall, this suggests that resource use activities linked to seagrasses can have large-scale implications if the scale exceeds critical levels. This emphasizes the need for holistic and adaptive management at the seascape level, specifically involving improved techniques for seaweed farming and fisheries, protection of keystone species, and ecosystem-based management approaches.
Sweatman, Jennifer L. "Gammaridean Amphipods as Bioindicators in Subtropical Seagrass Ecosystems." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2603.
Повний текст джерелаDewsbury, Bryan. "The Ecology and Economics of Seagrass Community Structure." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1237.
Повний текст джерелаEklöf, Johan S. "Anthropogenic disturbances and shifts in tropical seagrass ecosystems /." Stockholm : Department of Systems Ecology, Stockholm University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7285.
Повний текст джерелаRyer, Clifford H. "Studies of pipefish foraging in simulated seagrass habitats." W&M ScholarWorks, 1987. https://scholarworks.wm.edu/etd/1539616836.
Повний текст джерелаNielsen, Michele Erin. "Seed and seedling dynamics of the seagrass, Zostera japonica Aschers. and Graebn. and the influence of Zostera marina L." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30172.
Повний текст джерелаScience, Faculty of
Botany, Department of
Graduate
Hossain, Md Mustafa Kamal, and res cand@acu edu au. "An Examination of Seagrass Monitoring Protocols as Applied to Two New South Wales Estuarine Settings." Australian Catholic University. School of Arts and Sciences (NSW), 2005. http://dlibrary.acu.edu.au/digitaltheses/public/adt-acuvp81.25092005.
Повний текст джерелаLafratta, Anna. "Role of seagrasses as biogeochemical sinks and environmental archives." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2381.
Повний текст джерелаScapin, Luca <1989>. "Habitat use of fish in seagrass meadows of the Venice lagoon: implications for seagrass restoration and for conservation of the lagoon seascape." Doctoral thesis, Università Ca' Foscari Venezia, 2017. http://hdl.handle.net/10579/12910.
Повний текст джерелаLongstaff, Benjamin J. "Investigations into the light requirements of seagrasses in Northeast Australia /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17246.pdf.
Повний текст джерелаBuchan, Olivia Claire Lewis Ronald D. "Relationships between large benthic foraminifera and their seagrass habitats, San Salvador, Bahamas." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/BUCHAN_OLIVIA_31.pdf.
Повний текст джерелаLee, Kun-seop. "Nitrogen budget of the seagrass Thalassia testudinum in the western Gulf of Mexico /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерелаBourque, Amanda. "Ecosystem structure in disturbed and restored subtropical seagrass meadows." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/792.
Повний текст джерелаUnsworth, R. K. F. "Aspects of the ecology of Indo-Pacific seagrass systems." Thesis, University of Essex, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442526.
Повний текст джерелаBurkholder, Derek A. "Top Down Control in a Relatively Pristine Seagrass Ecosystem." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/799.
Повний текст джерелаMaxwell, Paul Stuart. "Ecological Resilience Theory : Application and Testing in Seagrass Ecosystems." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/365921.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Haig, Jodie. "A Phylogeographic Study of Seagrass-Associated Shrimp in Queensland." Thesis, Griffith University, 2010. http://hdl.handle.net/10072/366639.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text