Дисертації з теми "Algal Grazing"
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Madikiza, Liwalam Onwabile. "The role of grazers and basal sustrate cover in the control of intertidal algal distribution." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&.
Повний текст джерелаGraham, Sylvia Lynne. "Growth and grazing of microzooplankton in response to the harmful alga Heterosigma akashiwo in prey mixtures /." Online version, 2008. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=305&CISOBOX=1&REC=8.
Повний текст джерелаVENULEO, MARIANNA. "Algal responses to abiotic and biotic environmental changes." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245503.
Повний текст джерелаAlgae exhibit a large variety of physiological responses to the environmental changes. Such heterogeneity of responses, which is a major determinant of species interaction in natural algal assemblages, was the target of my research. My results show that different species are differently prone to change their cell composition in response to environmental changes, depending on the type and duration of the perturbation. When algae are exposed to changes in the N source and in the CO2 availability, for instance, homeostasis appears as a much more common strategy than usually believed. No link between the response modes and the taxonomy of the examined species was found. I paid special attention to Chromera velia, a photosynthetic relative of apicomplexan parasites that is likely involved in symbiotic associations with scleractinian corals. This alga seems perfectly capable of copying with very high CO2. Life at high CO2 stimulates the overall organic C production of C. velia, increases its nutrient use efficiency and changes the stoichiometric relationships among elements within the cell. The high CO2 concentrations that has been reported in the animal tissue surrounding the photosynthetic cells may therefore facilitate C. velia life in symbiosis. Finally, I have demonstrated that the interactions between algae and environment can affect the relationships between algae and their grazers. My experiments show that the copepods are able to discriminate among algae identical in all aspects but in cell composition, while the rotifers are not. Therefore, the nutritional history of algae, which has the potential to affect algal cell composition, appears as a major determinant of the relationships between algae and grazers.
Vost, L. M. "The influence of grazing by the sea urchin Echinus esculentus L. on subtidal algal communities." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372713.
Повний текст джерелаRosser, S. M. Jane Horner. "Phytoplankton ecology in the upper Swan River estuary, Western Australia: with special reference to nitrogen uptake and microheterotroph grazing." Thesis, Curtin University, 2004. http://hdl.handle.net/20.500.11937/1562.
Повний текст джерелаKennedy, Matthew R. "The Role of Microzooplankton and Mesozooplankton Grazing During the Planktothrix-Dominated Cyanobacterial Blooms in Sandusky Bay, Lake Erie." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1589546747826657.
Повний текст джерелаRosser, S. M. Jane Horner. "Phytoplankton ecology in the upper Swan River estuary, Western Australia: with special reference to nitrogen uptake and microheterotroph grazing." Curtin University of Technology, Department of Environmental Biology, 2004. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16266.
Повний текст джерелаSpecific uptake rates (v), normalised to chlorophyll a, for NO;, NH4+ and urea were 0.2 ± 0.04 - 1831.1 ± 779.19, 0.5 ± 0.26 - 1731.6 ± 346.67 and 3.0 ± 0.60 - 2241.2 ± 252.56 ng N μg Chla-1 respectively. Urea concentration (14.8 - 117.7 μg urea-N 1-1) remained relatively constant over the 12 month study period. Measured ambient specific uptake rates for urea represent between 27.5% and 40.4% of total N uptake over the annual period February 1998 -January 1999. Seasonal nitrate uptake over the same period constituted only 11.3% (±10.77%, n=12) to 24.4% (± 13.02%, n=12) with the highest percentage during winter, when nitrate levels are elevated. It is suggested that urea provides a nutrient intermediary over the spring - summer period during transition from autotrophic to heterotrophic dominated communities. Grazing ,and nitrogen recycling are intricately connected by simultaneously providing top-down biomass control and bottom-up nutrient supply. Zooplankton (> 44 μm) grazing has been shown to reduce up to 40% of phytoplankton standing stock at times. Microheterotrophs (<300 pm) can reduce phytoplankton biomass production by up to 100% (potential production grazed, 11.1% day' - 99.6 % day-1) over an annual cycle. This correlated to mean seasonal day-time grazing loss of 80.47 ± 3.5 ngN μg Chla-1 in surface waters and 20.17 ± 9.7 ngN μg Chla-1 at depth (4.5m). Night time grazing for surface and bottom depths resulted in similar nitrogen loss rates (13.03 ± 4.84 ngN μg Chla-1).
Uptake rates for nitrate (r2 0.501) and urea (r2 0.512), doing with temperature (r2 0.605) were shown to have the greatest influence on phytoplankton distribution over depth and time. This research emphasises the need for more detailed investigations into the physiology of nutrient uptake and the effects of nutrient fluxes on phytoplankton biomass and distribution. Further research into the roles of organic nitrogen and pico and nanoplankton in this system is recommended.
Manley, Nicola Louise. "Polyphenolic compounds in intertidal fuciod algae and their effectiveness as grazing deterrents." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333575.
Повний текст джерелаRowcliffe, J. Marcus. "The population ecology of brent geese and their food plants." Thesis, University of East Anglia, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365866.
Повний текст джерелаSchwinnen, Chad Robert. "Impacts of a Herbivorous Fish, Campostoma anomalum (central stoneroller), on Nitrogen Fixation by Benthic Algae." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1284993489.
Повний текст джерелаSteele, Nikita. "Geographical variation in effects of nutrient levels and grazing intensity on community structure between upwelling and non-upwelling regions of South Africa." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013013.
Повний текст джерелаDiaz, Diaz Eliecer Rodrigo. "Hierarchical spatial structure and levels of resolution of intertidal grazing and their consequences on predictability and stability at small scales." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005393.
Повний текст джерелаZhang, Hongyan. "Ecological modeling of the lower trophic levels of Lake Erie." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1163785412.
Повний текст джерелаPiarulli, Stefania. "Divergence patterns in Fucus seaweeds (Phaeophyceae) in the northern Baltic Sea and in the Tjongspollen area." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9544/.
Повний текст джерелаAbitha, R. "Algiculture - A Novel Algae Cultivation Technique for Sustinable Algal Biofuel Production and Capture of Green House Gases." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/4070.
Повний текст джерелаCampbell, Jena Renee. "The role of protozoan grazers in harmful algal bloom dynamics : tools for community and grazing analyses." 2012. http://hdl.handle.net/2152/19574.
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Wang, Hung-Yu, and 汪鴻玉. "Effects of environmental factors, disturbance, and grazing of fish on the succession of algal communities in Hapen Creek." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/36410373671903210222.
Повний текст джерела國立臺灣大學
動物學研究所
91
A study on the interaction between environmental factors and algal communities in Hapen Creek was conducted from March 2002 to March 2003. Six study sites, including lotic and lentic habitats, were chosen. A total of 38 diatom species, 11 of cyanobacteria, and 7 of green algae were identified from these sites. The results of PCA ordination showed that higher correlation coefficients were obtained between the algal communities and those variables such as current velocity, depth, DO, conductivity, and nitrate, suggesting that these variables should have played more important roles than others in determining the structure of the algal communities and the growth of algae in riffles, although pH, turbidity, and orthophosphate were found to have effects on algae in pools. Under undisturbed condition, both of the algal biomass (in terms of chlorophyll a and AFDM) and Shannon species diversity index in lotic habitats were higher than those in lentic habitats. Under disturbed condition, in contrast, there were decreases in the algal biomass and diversity in either habitat, and, as a result, certain changes in community structure. It was found that habit disturbance caused significantly a lowering in the abundance of diatoms, but an enhancement in that of green algae in the riffles as well as cyanobacteria in the pools. This study showed that when algal communities were confronted by frequent disturbance, those of long-lived and more resistant species, such as Cocconeis placentula and Gongrosira sp., would dominate over others and replaced consequently the early invader such as Oedogonium sp. Taiwan shoveljaw carp (Varicorhinus barbatulus), feeding on attached algae, is the most dominant fish in Hapen Creek. The study of the grazing effects of V. barbatulus on algal communities in both of the lotic and lentic habitats in Hapen Creek was done from December 2002 to March 2003. The collected algal assemblages from grazed treatment (viz., grazed by V. barbatulus) would be analyzed with those from undisturbed, disturbed, and exposed treatments (viz., boulders exposed to grazers in streams) to examine the short-term biotic interactions. The results showed that the grazing of V. barbatulus not only reduced the biomass of the algae, but also altered the structure and composition of algal assemblages. The grazing effect of V. barbatulus has given rise to a decrease in the relative abundance of diatoms and an increase in greens in lotic habitats or blue-greens in lentic habitat as well. The composition of algal assemblages of grazed treatment was similar with that of exposed treatments. Hence, it was found that V. barbatulus exerted a density-dependent consumption effect on the attached algae and might thus be considered a keystone herbivore in the study area.
Burt, Alexis Emelia. "Mercury uptake and dynamics in sea ice algae, phytoplankton and grazing copepods from a Beaufort Sea Arctic marine food web." 2012. http://hdl.handle.net/1993/8907.
Повний текст джерелаDiaz, Diaz Eliecer Rodrigo. "Hierarchical spatial structure and levels of resolution of intertidal grazing and their consequences on predictability and stability at small scales /." 2008. http://eprints.ru.ac.za/1558/.
Повний текст джерелаKaehler, S., and Pierre William Froneman. "Temporal variability in the effects of grazing by the territorial limpet Patella longicosta on the productivity of the crustose alga Ralfsia verrucosa." 1999. http://hdl.handle.net/10962/d1011956.
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