Overton, Ian Clifford.

Thesis (B.A.(Hons.))--University of Adelaide, Dept. of Geography, 1994. / Includes bibliographical references (leaves 90-95).

Kosche, Kristin.

Bremen, University, Diss., 2008.

Goodfriend, Daniel Scott.

Thesis (M.S.)--University of Florida, 2004. / Title from title page of source document. Document formatted into pages; contains 58 pages. Includes vita. Includes bibliographical references.

Ryer, Clifford H.

The purpose of this study is to examine the feeding ecology and trophic role/importance of the northern pipefish, Syngnathus fuscus, in a lower Chesapeake Bay seagrass community. The study incorporates; 1) examination of stomach contents in conjunction with prey abundance data, inorder to arrive at conclusions concerning the food preferences of S· fuscus, 2) determination of daily feeding periodicities and stomach evacuation parameters, thus allowing for the determination of a daily ration for S...

Blake, Rachael E.

Anthropogenic stressors are increasingly changing conditions in coastal areas and impacting important habitats. But, when multiple stressors act simultaneously, their effects on ecosystems become more difficult to predict. In Chesapeake Bay, USA, predictions suggest that anthropogenic stressors from climate change, such as warming temperatures, may increase the frequency and severity of storm events, leading to increased freshwater, nutrient, and sediment inputs. Coastal development, another sou...

Pardieck, Renee A.

No description available.

Murray, Laura

The relative contributions to organic matter production and the interactions between submerged vascular plants and their associated microalgae assemblages were investigated in seagrass communities characteristic of the lower Chesapeake Bay. The studies were conducted in three parts; the first compared production and respiration of the major autotrophic components in adjacent seagrass communities dominated by Zostera marina and Ruppia maritima, respectively. Annual production for the two communit...

Lauritsen, Johanna

This thesis applies the food security concept to assess the significance of seagrass-associated invertebrate gleaning for providing food security in Kaole, Tanzania. It assesses the availability, accessibility, utilisation and stability over time of this food source. To explore this, a multi-strategy research design was used. Structured interviews were held with 30 gleaning women in Kaole, using a self-developed questionnaire designed to address the four components of the food security framework...

Roca Carceller, Guillem

Nearshore marine ecosystems like seagrass meadows face a wide range of anthropogenic influences, impacting the system at different spatial and temporal scales. Managing these systems in the face of these pressures requires detailed knowledge of how seagrass habitats respond to these various threats. A plethora of useful indicators have been developed to help managers and policy makers track seagrass meadow health and status, detect environmental impacts or measure the effectiveness of management...

Nielsen, Michele Erin

The seagrass Zostera japonica Aschers. and Graebn. occurs as pure populations and in mixture with Zostera marina L. along the intertidal regions of southwest British Columbia. At the Roberts Bank study area seed and seedling dynamics were studied in three vegetation zones: a landward monospecific zone of Z. japonica, a zone of co-existing Z. japonica and Z. marina, and a seaward monospecific zone of Z. marina. Many more seeds were produced than were found in the sediment, and even fewer germinat...

Webb, Donald G.

The hypothesis that predation by juvenile chum (Oncorhynchus keta (Walbaum)) and pink (Oncorhynchus gorbuscha (Walbaum)) salmon controls the abundance of harpacticoid copepods inhabiting a shallow subtidal seagrass (Zostera marina L.) bed on Roberts Bank, British Columbia, was tested. Previous studies of the impact of juvenile salmonid predation on harpacticoid communities have yielded contradictory results and have been based on indirect and weak evidence. The hypothesis was tested in two ways:...

Arendse, Brittany

Seagrass meadows have important ecological roles in coastal ecosystems and provide high-value ecosystems services compared to other marine and terrestrial habitats. Despite this, there is growing evidence that this key ecosystems is declining on a global scale. Much of these declines have been attributed to the effects of human alterations of marine habitats. Continued destructive activities, in both South Africa and elsewhere, if not managed properly will result in the demise of seagrass beds f...

Horn, Lotte E.

Thesis (Ph.D.)--Murdoch University, 2006. / Thesis submitted to the Division of Science and Engineering. Bibliography: leaves 110-127.

Bradley, Brian Kevin.

Thesis (M.S.)--University of West Florida, 2007. / Title from title page of source document. Document formatted into pages; contains 69 pages. Includes bibliographical references.

Frankovich, Thomas Anthony.

Thesis (Ph. D.)--University of Virginia, 2006. / Includes bibliographical references (leaves 172-200). Also available online through Digital Dissertations.

Wilson, Sara Susan

Seagrasses are extremely productive coastal plant communities that serve as habitat for various types of marine and estuarine fauna and provide numerous ecosystem services. Seagrass meadows around the world have become threatened by environmental and anthropogenic pressures such as altered hydrologic regimes, physical disturbances, and eutrophication. Monitoring programs that provide high-resolution information and document changes in cover, morphometric characteristics, species composition, and...

Azcona, Alexandra

Algal blooms have caused significant losses in seagrass and macroalgae in the Indian River Lagoon, FL. To gain an understanding of these effects, samples of Gracilaria sp., Halodule wrightii, pinfish, and white mullet were taken throughout October and November of 2013. Samples from 2001 of Gracilaria sp., Halodule wrightii, Syringodium filiforme, Thalassia testudinum, pinfish, spotted seatrout, and white mullet were also obtained. Stable isotope data were obtained from these samples and compared...

Whippo, Ross Douglas Byron

The assembly and persistence of ecological communities is a phenomenon that occurs across large spatial and temporal scales. However, the relative effects of regional versus local processes on community structure are not well understood in marine ecosystems. In order to understand how scale can alter processes that drive variation in community assembly it is necessary to determine patterns of diversity across multiple scales. Here, I used invertebrate epifaunal communities in the foundation spec...

Gera, Alessandro

Overall, this thesis is an attempt at approaching seagrass ecosystems from a landscape perspective, with the aim of increasing knowledge about the processes generating patterns at large spatial scales, and understanding how these patterns interact with other drivers of seagrass function. Specifically, we focus on (i) understanding the dynamics of habitat fragmentation (Chapter 1), (ii) how this fragmentation interact with other seagrass disturbances, such as hydrodynamism, sedimentation and herb...

Wang, Shao-i

Fluctuation of the seagrass ecosystem may be informative to the impacts of environmental changes. This study focuses on a small, inconspicuous triplefin blenny, Enneapterygius minutus, found in a specific tide pool of seagrass meadow on Gui Wan Bi, Green Island, Taiwan. Its high abundance and stable residence make this species a suitable candidate to monitor the condition of the seagrass ecosystem. Monthly collections were made during low tide from April 2007 to July 2008. The otolith microstruc...

Sobocinski, Kathryn L.

The value of habitats in terms of biological production is of interest to ecologists and resource managers. Seagrasses are a commonly occurring habitat type in shallow marine waters and have been shown to support high abundances of fish and invertebrates. In lower Chesapeake Bay, seagrasses grow in a shallow fringe in the subtidal zone. Although, ample evidence exists for the value of these habitats as foraging and rearing areas for a variety of organisms, the connectivity among species and the ...

Bailey, Eva Machelor

No description available.

Spivak, Amanda C.

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 co...

Hovel, Kevin

Habitat fragmentation leads to small, isolated habitat patches in which ecological processes may differ substantially from those in larger, continuous habitats. Seagrass is a structurally complex but fragmented subtidal habitat that serves as a refuge from predation for juveniles of the blue crab, Callinectes sapidus Rathbun. I compared the effects of eelgrass ( Zostera marina L.) patch size and shoot density on juvenile blue crab survival both before (June) and after (September) shoot defoliat...

Toxic effects of pentachlorophenol on polychaete assemblages inhabiting a seagrass meadow were studied and analyzed in various ways. Examination of the effects proceeded from a more general approach (following changes of the structure of the polychaete group) to more specific ones, which included analyses at a functional and species-specific level. The study took place in a Gulf coast seagrass meadow located at Turkey Point Shoal. The shoal is dominated by mixed stands of Thalassia testudinum an...

The distribution patterns of infaunal polychaetes can be influenced by several factors (e.g., predation, competition, and, or disturbance). Adult-larval interactions have been shown to be important in communities where adult densities are high. Manipulative field experiments were used to test the effects of several adult species on the settlement and recruitment of infaunal polychaetes in seagrass beds on Turkey Point Shoal, St. George's Sound in the northern Gulf of Mexico. Interpretation of ob...

Seagrass is a key stone component for the Indian River Lagoon (IRL) ecosystem, and therefore it is an important topic for many studies in the lagoon. This study focuses on the effects of seagrass beds on the hydrodynamics in the IRL. A hydrodynamic model based on the Delft3D modeling system has been developed for the southern IRL including the St. Lucie estuary, Ft. Pierce and St. Lucie Inlets, and adjacent coastal waters. The model is driven by freshwater inputs from the watershed, tides, ...

Indirect effects occur when the interaction between two species is influenced by a third species. Recent empirical and theoretical evidence suggests that indirect effects have important influences on population regulation and community structure. Most studies of indirect effects have examined chains or networks of predation or competition. Indirect effects can also involve other types of interactions, yet their role in structuring communities is rarely considered. One such interaction, biologica...

Connor, Erin Grace

Thesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014. / Cataloged from PDF version of thesis. / Includes bibliographical references (pages 113-117). / Complex interactions between flow conditions, blade posture, and mass transport processes, represent a challenge to fully understanding the influence of hydrodynamic conditions on the flux of nutrients to the blade surface of submerged aquatic vegetation. To isolate the physical mechanisms fr...

Olson, Angeleen

Nearshore marine habitats provide critical nursery grounds for juvenile fishes, but their functional role requires the consideration of the impacts of spatial connectivity. This thesis examines nursery function in seagrass habitats through a marine landscape (“seascape”) lens, focusing on the spatial interactions between habitats, and their effects on population and trophic dynamics associated with nursery function to rockfish (Sebastes spp.). In the temperate Pacific Ocean, rockfish depend...

Dahl, Martin

Seagrasses are considered highly important CO2 sinks, with the capacity to store substantial quantities of organic carbon in the living biomass and sediments, and thereby acting as a buffer against climate change. In this thesis, I have studied carbon storage variability in temperate and tropical seagrass habitats and identified factors influencing this variation. In addition, as seagrass areas are decreasing worldwide, I have assessed effects of different anthropogenic disturbances on carbon se...

Uku, Jacqueline Nduku,

Diss. (sammanfattning) Stockholm : Univ., 2005. / Härtill 5 uppsatser.

Buchan, Olivia Claire, Lewis, Ronald D.

Thesis(M.S.)--Auburn University, 2006. / Abstract. Vita. Includes bibliographic references.

Seddon, Stephanie

Includes bibliographical refe / xiv, 171 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Investigates the causes and consequences of a sudden 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 processe...

Mvungi, Esther Francis

Seagrass meadows are highly productive, ecologically and economically valuable ecosystems. However, increased human activities along the coastal areas leading to processes such as eutrophication have resulted in the rapid loss and deterioration of seagrass ecosystems worldwide. This thesis focuses on the responses of seagrasses to increases in nutrients, subsequent increases in ephemeral algae, and changes in the physical-chemical properties of seawater induced by interaction with other marine b...

Hensgen, Geoffrey Michael

Habitat fragmentation is often regarded as a biodiversity threat associated with habitat degradation; however, research has also revealed beneficial effects on biodiversity as well, depending on the ecosystem and species community. This study examined the biodiversity of small nekton residing in seagrass meadows characterized by three levels of habitat fragmentation, and as a habitat gradient comprised of measures such as habitat amount, connectivity, patch shape, and proximity. Landscapes wer...

Darnell, Kelly Marie

Seagrasses are submerged marine plants that provide essential ecosystem functions, but are declining in abundance worldwide. As angiosperms, seagrasses are capable of sexual reproduction, but also propagate asexually through clonal rhizome growth. Clonal growth was traditionally considered the primary means for seagrass propagation. Recent developments in genetic techniques and an increasing number of studies examining seagrass population genetics, however, indicate that sexual reproduction is i...

Watson, Jeanette Esther, mikewood@deakin.edu.au

An important Athecate genus, Eudendrium, and a group of species of the Thecata, the latter ecologically related by life on a common substrate, are reviewed. Eudendrium, hitherto poorly known in Australia, comprises 17 species, including 10 undescribed species with 71% Australian, and high provincial endemicity. Eudendrium may be a shelf genus avoiding turbulent oceanic waters. Species of Eudendrium are predominantly epizoic and some gregariously settling colonies may live for five years. Identif...

Riordan, Nicholas

The Padthaway Ridge is overlain by a thin veneer (< 20 m) of Oligo-Miocene bioclastic carbonates representing the southern most extent of the Mannum Formation, Murray Supergroup, and Murray Basin limestones. The Mannum Formation is composed of warm-temperate carbonates rich in irregular echinoids, coralline algae, benthic foraminifers, and relict particles. The respective lithology are mostly structureless, burrow-mottled, and cross-cut by Thalassinoides burrows. These sediments are interpret...

Kilminster, Kieryn Lee

[Truncated abstract] Biogeochemical processes in seagrass sediments influence growth and nutrition of seagrasses. This thesis investigates the below-ground interactions between biotic and abiotic factors that influence seagrass nutrition and growth, with focus on a small species of seagrass, Halophila ovalis (R. Br.) Hook ƒ., from the Swan River Estuary, Western Australia. Seagrass showed significantly lower growth and an increase in leaf nitrogen and phosphorus concentrations with increased org...

Land, Frederick Joseph

During the growing seasons of 1999 and 2000 five experiments were performed to test growth of the seagrass Halodule beaudettei (shoal-grass) in nursery pond conditions. Sediment oxidation state, sediment source, container type, flow regime, and light transmittance were tested to improve nursery pond cultivation techniques and to test assumptions about the decline of seagrasses in Galveston Bay, Texas. Oxidized and reduced sediments exhibited no statistical difference as mean percent change in th...

Hebert, Andrew Brian

Seagrass productivity is largely limited by nutrient and light availability. However, increasing evidence suggests that sedimentary geochemical processes may play an essential role in seagrass productivity/health. Much of this work has been largely phenomenalistic and has not clearly identified the spatio-temporal behavior of the major geochemical parameters involved in diagenesis of seagrass sediments. In this study, a much broader range of both dissolved and solid phase chemical parameters ...

Waspe, Christopher Themba

Climate change is a reality. One of the main ecological concerns regarding climate change is the predicted increase in atmospheric and sea temperatures. The latter is expected to rise by roughly 2.5°C by the end of 2050 with dramatic impacts on marine ecosystems predicted around the world. Seagrass ecosystems are a good example of vital ecosystems that are threatened by climate change and other anthropogenic factors. A decline in global seagrass cover of 29% has been estimated over the last cent...

Blackburn, Natalia J.

In terrestrial systems, seed burial is widely recognized as a vital process that influences small- and large-scale plant population patterns. Despite its demonstrated importance in terrestrial literature, very little is known about seed burial in seagrasses. Zostera marina is a perennial seagrass found in northern temperate oceans worldwide, and is the dominant seagrass found in the Chesapeake Bay. In terrestrial systems, seed burial is frequently mediated by soil-dwelling invertebrates. The goa...

Meyer, Cathy Elizabeth

No description available.

Ryer, Clifford H.

Laboratory experiments determined the effects of two levels of habitat complexity upon pipefish (Syngnathus fuscus) foraging for amphipods. Habitats were composed of equal densities of either narrow (low complexity) or wide (high complexity) leafed artificial seagrass. The response to habitat, as measured by rate of encounter with amphipods, probability of attack after encounter, probability of success after attack, and overall rate of amphipod consumption, was determined for combinations of two...

To avoid unfavorable seasonal conditions, some species of calanoid copepods produce resting eggs that do not immediately hatch. When buried in the sediment, these eggs can remain viable from weeks to years, and therefore can represent a potentially important source of recruits to the pelagic population over various time scales. Copepod resting eggs tend to behave similarly to other fine particles in the water column and will accumulate in areas of high deposition and low resuspension. Seagrass b...

Lyimo, Liberatus Dominick

Seagrass meadows may play a substantial role in climate change mitigation as they are capable to sequester and store substantial amounts of anthropogenic carbon in plant biomass and, more importantly, in their underlying sediments. In this PhD thesis, the carbon-burial potential was assessed by quantifying the amount of organic carbon stored in different seagrass meadows, each dominated by one of the four major seagrass species in the Western Indian Ocean region. Impacts of anthropogenic disturb...

Eklöf, Johan S.,

Diss. (sammanfattning) Stockholm : Univ., 2008. / Härtill 6 uppsatser.

Vivoni-Gallart, Enrique Rafael, 1975-

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998. / Includes bibliographical references (p. 235-239). / by Ernique Rafael Vivoni Gallart. / S.M.