Download or read book A Study of the Spatial and Temporal Variation of Eelgrass Zostera Marina Its Epiphytes and the Grazer Phyllaplysia Taylori in Arcata Bay California USA written by Aimee Louise Keiser and published by . This book was released on 2004 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal Diel and Vertical Distribution Variation of Epiphyte Grazers in a Temperate Eelgrass Zostera Marina L System written by Travis Shaw and published by . This book was released on 1994 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigating Perennial Annual Eelgrass Zostera Marina L in Padilla Bay as Potential Donor Sources for Seed based Restoration written by Yuki Wilmerding and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper explores recovery of eelgrass (Zostera marina L.) meadows through seed-based restoration to address declines from natural and anthropogenic disturbances. The study focuses on the Joe Leary meadow site in Padilla Bay, Washington, aiming to (1) determine the spatial distribution of perennial and annual Z. marina, (2) understand variation in flowering shoot density and potential seed production, and (3) compare the phenology of flowering shoots. These objectives were investigated using field-based methods to collect presence/absence transect data for delineation, quadrat-based count data, and monitor seed development. Data collection occurred in the summer throughout the flowering life stage of eelgrass in the site. The study found spatial and temporal variation in the distribution, density, and phenology of flowering perennial and annual populations. Delineation methods revealed that annuals have a similar range in the intertidal as perennials, with differences highlighted in response to potential stress indicators such as proximity to the slough, algal mats, or elevation. Quadrat-based monitoring found annual shoots in the transect higher in the intertidal, above the perennial population. Phenology data indicated that perennial shoots flower about a month prior to annual shoots. While the study advises against using perennial flowering shoots for restoration due to low densities, it emphasizes Joe Leary's potential as a donor site for flowering annuals for seed-based restoration. Careful considerations are crucial to avoid unintended introductions of non-native species. The research concludes with recommendations for refining delineation methods, enhancing understanding of eelgrass population dynamics, and optimizing seed collection strategies for genetically diverse and resilient restoration in the face of climate change.
Download or read book Supplementary Bibliography on Eelgrass Zostera Marina written by C. Peter McRoy and published by . This book was released on 1968 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bibliography lists 204 references on eelgrass to supplement an earlier list (Special Scientific Report--Wildlife No. 79) issued in 1964.
Download or read book Status of Eelgrass Zostera Marina on the North Atlantic Coast February 1938 written by Clarence Cottam and published by . This book was released on 1938 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Spatial Model of Eelgrass Zostera Marina Habitat in Humboldt Bay California written by Whelan Gilkerson and published by . This book was released on 2008 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted to model the extent of eelgrass habitat in Humboldt Bay, California through physical surveys of the maximum depths and upper limits of growth in conjunction with recently acquired high-resolution bathymetry data and supplemental imagery. A combination of chronic turbidity, frequent coastal stratus, and wind-waves, make Humboldt Bay a challenging environment to assess subtidal eelgrass (Zostera marina) habitat from remotely-sensed imagery. Additionally, eelgrass and green algae overlap extensively in shallow intertidal areas, confounding efforts to distinguish between habitat types from imagery alone. A relative exposure index (REI) was developed to identify areas of eelgrass habitat that may be prone to disturbance from wind-waves. Approximately 2200 hectares of eelgrass habitat were identified. Accuracy was assessed at 91% for modeled eelgrass habitat in South Humboldt Bay based on a comparison with hyperspectral imagery captured in October, 2004. Modeling the extent of eelgrass habitat represents an important step towards understanding the extent to which future restoration or mitigation may be possible in Humboldt Bay.
Download or read book Interactions and Dynamics of Eelgrass Zostera Marina L Epiphytes and Grazers in Subtidal Meadows of Puget Sound written by Timothy Alan Nelson and published by . This book was released on 1995 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production Ecology of Eelgrass Zostera Marina L and Its Epiphytes in Little Egg Harbor New Jersey written by David Elwyn Vaughan and published by . This book was released on 1982 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Population Genetic Study of the Zostera Marina eelgrass Ecotypes of Barnegat Bay New Jersey and Implications for Grass Bed Restoration written by Stephanie Marie Smith and published by . This book was released on 2007 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Spatial temporal Eelgrass Zostera Marina Habitat Change 1932 2016 in the Salish Sea Using Historic Aerial Photography and Unmanned Aerial Vehicle written by Natasha K. Nahirnick and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Eelgrass (Zostera marina) is a critical nearshore marine habitat for juvenile Pacific salmon (Oncorhynchus spp.) as they depart from their natal streams. Given the poor marine survival of Coho (O. kisutch) and Chinook (O. tshawytscha) salmon juveniles in recent decades, it is hypothesized that deteriorating eelgrass habitats could contribute to their low survival. The primary goal of this research was to investigate the possible long-term spatial-temporal trends in eelgrass habitat in the Salish Sea and was addressed by two main objectives: (1) Define a methodology for mapping eelgrass habitats using UAV imagery to create a baseline for long-term mapping; and (2) Assess changes in eelgrass area coverage and fragmentation over the period of 1932-2016 using historic aerial photographs and Unmanned Aerial Vehicle (UAV) imagery, and assess the relationship between eelgrass and residential housing density and shoreline activities. Three study sites in the Southern Gulf Islands of the Salish Sea were chosen for analysis. The overall accuracies of eelgrass delineation from UAV imagery were 95.3%, 88.9%, and 90.1% for Village Bay, Horton Bay, and Lyall Harbour, respectively. The UAV method was found to be highly effective for this size of study site, however results were impacted by the environmental conditions at the time of acquisition, namely: sun angle, tidal height, cloud cover, water clarity, and wind speed. The results from the first objective were incorporated into a long-term dataset of historic aerial photography and used to evaluate changes in eelgrass area and fragmentation. All three eelgrass meadows showed a deteriorating trend in eelgrass condition. On average, eelgrass area coverage decreases by 41% while meadow complexity as indicated by the shape index increases by 76%. Shoreline activities (boats, docks, log booms, and shoreline armouring) and residential housing density increased markedly at all sites over the study period. By using a linear correlation model, it was revealed that eelgrass areal coverage and fragmentation (Shape Index) were, in general, very strongly correlated to these landscape-level coastal environmental indicators. While this correlation model is not meant to show a direct causative impact on eelgrass at these sites, these results suggest an overall deterioration of coastal environmental health in the Salish Sea due to a dramatic increase in the use of the coastal zone, as well as likely declines in water quality due to urbanization.
Download or read book An Observational and Experimental Analysis of Eelgrass and Its Epifaunal Community in Bodega Harbor California written by Grace Ha and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Seagrass - marine flowering plants that create underwater meadows through-out temperate and tropical coastal waters - are important foundation species, acting as key nursery grounds for many commercial and recreational fisheries, performing ecosystem functions including flow modification and sediment stabilization, and providing habitat to diverse and productive communities of marine life. Given the decline of seagrass globally, there is particular need for documenting and understanding the dynamics of seagrass ecosystems. Focusing on the eelgrass (Zostera marina L.) beds of Bodega Harbor, California, USA, I approached this task through methods that incorporated natural history, field research, statistical analysis, and taxonomy. In Chapter 1, I conducted a 16-month survey of eelgrass and its epifauna and analyzed species abundances in the context of the extreme warm-water event known as "The Blob" that occurred along the Californian coastline in 2014. My research found a diverse invertebrate assemblage comprising mostly native detritivore-grazers, which contrasted sharply with nearby San Francisco Bay, which has been dominated by invasive species. Invertebrate population dynamics correlated closely to that of the eelgrass they inhabited, and in general, both habitat and epifauna declines coincided with increasing seawater temperatures. In Chapter 2, I used eelgrass as a model system to test the role of camouflage in predator-prey interactions. I conducted field experiments, testing whether prey survival was affected by color-matching between prey and habitat, using the green amphipod, Ampithoe lacertosa and artificial habitats made of eelgrass, and clear, red, and green plastic ribbon. With seine nets and underwater video recordings, I also collected data on fish predator abundance and diversity. Although generalized linear regressions in-dicated habitat color significantly affected prey survival, greater color-matching did not predict greater prey survival. Further analysis using structural equation modeling indicated that the effect of habitat on prey survival was significantly mediated by fish density and, to a lesser degree, fish diversity. Even after taking these effects into account, I did not find survival to clearly correspond to increasing color-match between prey and habitat. These results were consistent with the equivocal conclusions of previous studies on the anti-predator hypothesis of camouflage, altogether suggesting further theory development and experimentation is needed to explain the frequency of apparent camouflage in nature. In Chapter 3, I described a new species of porcellidiid copepod - found during the epifaunal surveys I conducted in 2013-2014. This was the first porcellidiid copepod species to be described from North America, although porcellidiid copepods have been previously recorded in Northeast Pacific coastal surveys. Porcellidium species nova n. sp., can be distinguished by a deep cleft in the female genital double somite, a lack of plumulose setae and three coupling denticles (two bulbous denticulate pads and one smooth protrusion) on the male antennule, and clear coloration with purple/maroon bands across the first and last metasomes. I have provided a partial revision to a key to Porcellidium species, along with a discussion of the natural history and distribution of porcellidiid copepods along the Northeastern Pacific coastline.
Download or read book The Effects of Mesograzer Biodiversity and Seagrass Structural Complexity on Eelgrass Ecosystem Function written by and published by . This book was released on 2016 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A central theory of community ecology is that increased biodiversity results in greater ecosystem function and stability. Many experiments have examined biodiversity-ecosystem function (BEF) relationships at the primary producer level, yet BEF relationships are equally pertinent at higher trophic levels. In seagrass ecosystems, mesograzers (small invertebrate herbivores) promote seagrass persistence by consuming competitively superior epiphytic algae that foul seagrass blades. Experiments in seagrass habitat suggest that mesograzer diversity is a primary driver of top-down control of epiphytic algae, but also that the relationship is temporally and spatially variable. The primary hypothesis of my study is that much of this variability may be due to differences in seagrass habitat structure through time and space. I worked in eelgrass (Zostera marina) habitat in San Diego Bay, California, USA, to test whether variability in eelgrass structural complexity (shoot density) affects relationships between mesograzer biodiversity and ecosystem function (grazing impact and secondary production). I also examined the functional roles of numerically dominant eelgrass epifauna, using a laboratory experiment and stable isotope analysis. Contrary to BEF theory, increased grazer diversity in laboratory mesocosms resulted in decreased grazing impact and facilitation of algal growth. Though some species combinations resulted in increased algal grazing, antagonistic relationships among the most influential grazing taxa resulted in reduced ecosystem function. Structural complexity promoted mesograzer top-down control of epiphytes, increased mesograzer secondary production, and altered epifaunal community composition. Effects of biodiversity and structural complexity on grazing corresponded to variability in diet and feeding behavior among dominant epifaunal taxa. My results demonstrate the importance of examining species-specific interactions when considering links between community structure and ecosystem function, and that environmental context, such as habitat structure, may have large effects on BEF relationships.
Download or read book Seasonal and Year to year Variations in the Growth of Zostera Marina L eelgrass in the Lower Chesapeake Bay written by R. J. Orth and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecology and Morphology of Eelgrass Zostera Marina L and Its Associated Macrophyte Community in Relation to Environmental Variables written by Joanne C. Bintz and published by . This book was released on 2002 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Variation of Carbon Uptake and Translocation by Eelgrass Zostera Marina L in Great South Bay New York written by Betty Ann Adamson and published by . This book was released on 1982 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecological Consequences of Genetic Diversity in Eelgrass Zostera Marina written by Anne Randall Hughes and published by . This book was released on 2006 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variability in Biomass and Primary Productivity in an Eelgrass Zostera Marina L Community written by Phillip Alan Sykes and published by . This book was released on 1983 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
