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 46 for “"Seagrasses"”.
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Unraveling the mystery of leaf reddening in seagrasses
… stressors so that researchers can better manage seagrasses for resilience to environmental change. Leaf reddening, the expression of red coloration in leaves, is a well-documented response in terrestrial plants that has been shown to increase resilience to stress, but has been poorly understood …
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Interactions between dugongs and seagrasses in a subtropical environment
… considered the ways in which dugongs affect the seagrasses and the significance of the dugongs' role in the seagrass system. Seagrasses were quantitatively mapped in two study areas, encompassing 133 krn2 of seagrass. Seven species of seagrass formed 15 recognised communities, which collapsed …
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Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors
… marine macrophytic communities (macroalgae and seagrasses) under in situ approaches to determine their overall contribution in the whole system and their subsequent exchange with adjacent communities. Moreover, coastal vegetated communities, especially those dominated by seagrasses, are …
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Interactive effects of temperature and grazing by seagrass limpets (Siphonaria compressa and Fissurella mutabilis) on seagrass (Zostera capensis)
… limiting light and nutrient availability to seagrasses. Key grazers, however, can potentially limit microalgal growth on seagrasses, but this function is dependant on how they respond to temperature change. Therefore, understanding the effects of temperature on seagrasses and their grazing …
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Potential Impacts of Climate Change on Photochemistry of <i>Zostera Marina</i> L.
<p>Seagrasses account for approximately 10% of the ocean’s total carbon storage, although photosynthesis of seagrasses is carbon limited at today’s oceanic pH. Therefore, increasing atmospheric CO<sub>2</sub> concentration, which results in ocean acidification/carbonation, is predicted to have a …
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Causes and ecological consequences of the Spencer Gulf seagrass dieback / Stephanie Seddon.
… dieback of intertidal and shallow subtidal seagrasses along 95 km of the eastern coast of Spencer Gulf, South Australia. Concludes with a conceptual model specific to shallow waters of Spencer Gulf where climatological extremes and geological processes are the main environmental factors …
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Plant-Pathogen Interactions Associated with Wasting Disease in the Tropical Seagrass Thalassia testudinum.
… events preceding ROS emission revealed that seagrasses contain ROS-generating machinery and signal transduction components that appear to be evolutionarily conserved with the defense response systems of terrestrial plants. It is undetermined whether or not the increased ROS associated with …
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Recruitment of Blue Crab, <i>Callinectes sapidus,</i> Postlarvae to the Back-Barrier Lagoons of Virginia's Eastern Shore
… residence time of water in the system.</p> <p>Seagrasses are largely absent from the lagoons and megalopae use benthic macroalgae as a settlement habitat. Laboratory experiments demonstrate that macroalgae is an effective refuge from predation for newly settled megalopae. Megalopae appear to …
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Exploring the role of reactive oxygen species (ROS) in marine ecosystem health and function
… of coastal ecosystems such as coral reefs and seagrasses, it is crucial to better understand the health of these ecosystem to prevent future loss. Reactive oxygen speices (ROS), such as superoxide and hydrogen peroxide, play an underappreciated role in both organism health and ecosystem …
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Respuestas ecofisiológicas al enriquecimiento de amonio en angiospermas marinas
… caused by high ammonium (NH4+) concentrations on seagrasses has received little attention, in spite of some pioneer works. Adverse effects of NH4+ enrichment have been traditionally explained by internal accumulation of NH4+. To prevent toxic effects, plants must assimilate this nutrient into …
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Effects of temperature and location on the photosynthesis-irradiance relationship of the seagrass Halophila ovalis
Seagrasses are among the most threatened ecosystems globally, despite their ecological importance. The global area is declining at a median rate of 5-7% y-1 which can be attributed to two major anthropogenic causes: direct impacts from coastal development and dredging, often associated with ports; …
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Molecular and physiological investigation of trace metal stress in seagrass, Zostera muelleri
… little is known about the toxicity responses of seagrasses to such perturbations. Understanding seagrass responses at the molecular level will ensure adequate conservation strategies to mitigate the increasing decline rate of seagrasses as a result of climate change and anthropogenic driven …
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Evaluation of coastal protection services provided by nearshore habitats in Cox Bay, Vancouver Island, British Columbia, Canada
… greatest amount of coastal protection, whereas seagrasses were found to have a negligible effect. These outcomes can inform policy and decision makers about trade-offs regarding habitat protection, coastal development and climate change adaptation.
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Blue carbon sequestration potential in Zostera marina eelgrass beds of the K'omoks Estuary, British Columbia
… amounts of blue carbon. Disconcertingly, seagrasses are experiencing global extent loss. Using dated sediment cores, the potential for carbon sequestration was assessed in Zostera marina eelgrass bed sediments of the K’ómoks Estuary. Some of the assessed areas are found to be …
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Assessing Feeding Preferences and Spatial Patterns of Lagodon rhomboides Linnaeus
… preferences have the potential to greatly impact seagrasses in this system. Twenty-four hour feeding trials were conducted to determine pinfish preference between seagrass (<em>Thalassia testudinum</em>) and algal epiphytes. St. Joseph Bay, FL was also surveyed to determine areas within this …
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Evaluating the Role of Habitat Complexity in Structuring Seagrass Communities
Biogenic coastal habitats such as salt marshes, seagrasses, and oyster reefs, support diverse faunal communities and can serve as nursery areas by enhancing the abundance, growth, and survival of juvenile fish and crustaceans. The structure and complexity of these biogenic habitats can strongly …
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Evaluating in situ Grazing Patterns of Lytechinus variegatus and their Effects on Seagrass Beds of Thalassia testudinum
… to understand how sea urchins are affecting seagrasses <em>in situ</em>. Results indicate that urchins were found in the offshore portion of the seagrass bed at densities up to 4 urchins/m<sup>2</sup>. Changes in temperature and sediment size in the bay indicate that there is a greater …
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Microbial carbon sources on the shelf and slope of the northwestern Gulf of Mexico
… coastal lagoon dominated by a single OM source, seagrasses; shelf stations, a eutrophic coastal region receiving multiple sources of OM, hypoxic regions that occur seasonally and deep slope and abyssal plain sediments of the Gulf of Mexico (GOM). Previous reports using the Laguna Madre data as …
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CHANGES IN THE MORPHOLOGY OF WIDGEON GRASS (RUPPIA MARITIMA) WITH THE ONSET OF REPRODUCTION AND IMPACTS ON FISH ASSEMBLAGES AT THE CHANDELEUR ISLANDS, LA
<p>Seagrasses are important submerged coastal habitats that support nearshore communities. <em>Ruppia maritima</em> (widgeon grass) is a widespread species whose leaves branch extensively when reproductive. The goal of this study was to understand use of reproductive and non-reproductive <em>R. …
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Assessing biofilm and epiphytes on seagrass leaves as bioindicators of environmental change
Seagrasses are highly valued for their productivity and ecosystem services. Despite their importance, seagrasses are declining globally, with losses comparable to tropical rainforests and coral reef ecosystems. Eutrophication and light reduction are two major environmental pressures contributing to …
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