Academic literature on the topic 'Microphytobentho'
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Journal articles on the topic "Microphytobentho"
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Sylwestrzak, Zuzanna, Aleksandra Zgrundo, and Filip Pniewski. "Ecotoxicological Studies on the Effect of Roundup® (Glyphosate Formulation) on Marine Benthic Microalgae." International Journal of Environmental Research and Public Health 18, no. 3 (January 20, 2021): 884. http://dx.doi.org/10.3390/ijerph18030884.
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Glyphosate is a very effective herbicide and the main active ingredient in Roundup®—the most extensively used herbicide in the world. Since glyphosate is highly water soluble it reaches water bodies easily in surface water runoff. This prompted us to undertake an experiment to evaluate the effects of glyphosate in Roundup® on natural communities of marine microphytobenthos. Microphytobenthos communities were obtained from the environment, and after transporting them to the laboratory and acclimatizing them, they were tested under controlled conditions. Changes in microphytobenthos composition and structure and the deteriorating condition of the cells of community-forming organisms (assessed by analyzing changes in chloroplast shape) were used to assess the impact of Roundup® on endpoints. The tests indicated that microphytobenthic communities were relatively resistant to herbicide. The species richness of the communities probably enabled them to rebuild effectively. Sensitive species were replaced by those more tolerant of glyphosate. Only at the highest glyphosate concentration (8.5 g·dm−3) tested was a strong negative effect noted that limited community abundance and eliminated some of the organisms. The dominant diatoms in the communities were replaced by intensively developing cyanobacteria, which ultimately comprised nearly 60% of all the cells observed in the communities.
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Böer, S. I., C. Arnosti, J. E. E. van Beusekom, and A. Boetius. "Temporal variations in microbial activities and carbon turnover in subtidal sandy sediments." Biogeosciences Discussions 5, no. 6 (November 6, 2008): 4271–313. http://dx.doi.org/10.5194/bgd-5-4271-2008.
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Abstract. Temporal dynamics and vertical patterns in bacterial abundances and activities were studied in a shallow subtidal sand flat in the Sylt-Rømø Basin (North Frisian Wadden Sea, Germany.) Extracellular enzymatic activities, bacterial carbon production and community respiration showed strong (factor of 4–5) temporal variations that were mostly related to seasonal temperature change, but also to changes in substrate availability. These temporal patterns in activity were barely reflected in bacterial (200–400 mmol C m−2) and microphytobenthic biomass (800–1500 mmol C m−2) or the sedimentary carbohydrate inventory (1300–2900 mmol C m−2), suggesting that grazing controls the standing stocks of the microphytobenthic and bacterial assemblages. Despite their exposure to strong hydrodynamic forces such as tidal currents and wind-induced wave surge, the subtidal sandy sediments showed persistent vertical gradients in bacterial abundances, bacterial carbon production and extracellular enzymatic activities at all times. The vertical distribution of these parameters was tightly coupled to that of the microphytobenthos, dominated by diatoms. Despite the low organic carbon content typical for surge-exposed sandy sediments, high extracellular enzymatic activities and bacterial carbon production rates indicate a very active heterotrophic bacterial community, with a gross secondary productivity of 30–180 mmol C m−2, and a biomass turnover time of 2–18 days. Our data suggest that this high activity is supported by the rapid flux of carbohydrates from microphytobenthic primary productivity. Accordingly, the potential activities of enzymes hydrolyzing carbohydrates cover most of the total bacterial carbon demand during all seasons.
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Böer, S. I., C. Arnosti, J. E. E. van Beusekom, and A. Boetius. "Temporal variations in microbial activities and carbon turnover in subtidal sandy sediments." Biogeosciences 6, no. 7 (July 10, 2009): 1149–65. http://dx.doi.org/10.5194/bg-6-1149-2009.
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Abstract. Temporal dynamics and vertical patterns in bacterial abundances and activities were studied in a shallow subtidal sand flat in the Sylt-Rømø Basin (North Frisian Wadden Sea, Germany). Extracellular enzymatic activities, bacterial carbon production and community respiration showed strong (factor of 4–5) temporal variations that were mostly related to seasonal temperature change and to changes in substrate availability. These temporal patterns in enzymatic activity were barely reflected in bacterial (200–400 mmol C m−2) and microphytobenthic biomass (800–1500 mmol C m−2) or the sedimentary carbohydrate inventory (1300–2900 mmol C m−2), suggesting that grazing controls the standing stocks of the microphytobenthic and bacterial assemblages. Despite their exposure to strong hydrodynamic forces such as tidal currents and wind-induced wave surge, the subtidal sandy sediments showed persistent vertical gradients in bacterial abundances, carbon production and extracellular enzymatic activities at all times. The vertical distribution of these parameters was tightly coupled to that of the microphytobenthos, dominated by diatoms. Despite the low organic carbon content typical for surge-exposed sandy sediments, high extracellular enzymatic activities and bacterial carbon production rates indicate a very active heterotrophic bacterial community, with a gross secondary productivity of 30–180 mmol C m−2, and a biomass turnover time of 2–18 days. Our data suggest that this high activity is supported by the rapid flux of carbohydrates from microphytobenthic primary productivity. Accordingly, the potential activities of enzymes hydrolyzing carbohydrates cover most of the total bacterial carbon demand during all seasons.
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Defew, E. C., T. J. Tolhurst, and D. M. Paterson. "Site-specific features influence sediment stability of intertidal flats." Hydrology and Earth System Sciences 6, no. 6 (December 31, 2002): 971–82. http://dx.doi.org/10.5194/hess-6-971-2002.
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Abstract. The factors that influence the sediment stability and the transport of estuarine mudflats are not yet fully understood but knowledge of them is essential in coastal engineering applications and pollution ecology studies. The suggestion that variation in predictive models of sediment stability might be due to site-specific characteristics is investigated using data from four estuarine mudflats (Eden Estuary, Scotland, the Biezelingsche Ham, Zandkreek, and Molenplaat mudflats in The Netherlands). These estuaries differ in their environmental conditions, macrofaunal species composition and local features (e.g. Enteromorpha mats, migratory biofilms). Stable and unstable sediments were compared, and mean chlorophyll-a concentrations and granulometry of the sediments were significantly different between the two groups. Step-wise multiple linear regressions were applied to the sediment stability data of all sites to establish the influences on erosion threshold of microphytobenthic biomass, water content, granulometry, organic carbon content and the abundance of dominant macrofaunal species. The stability of each site was influenced by different factors. Sediment stability of the Eden Estuary was affected by the Enteromorpha bloom; Biezelingsche Ham was influenced by the highly migratory nature of the diatom biofilms and the abundance of Corophium volutator; the polychaete worm Arenicola marina had a net negative effect on sediment stability of the Zandkreek; and the Molenplaat was influenced by microphytobenthic biomass. This research highlights the need for site-specific calibration of models and suggests that a universal proxy parameter for sediment stability is unlikely to be obtained. Keywords: sediment stability; erosion threshold; cohesive strength meter; microphytobenthos; Enteromorpha spp.
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Sylwestrzak, Zuzanna, Aleksandra Zgrundo, and Filip Pniewski. "Effects of the Ionic Liquid [BMIM]Cl on the Baltic Microphytobenthic Communities." Journal of Marine Science and Engineering 10, no. 9 (September 1, 2022): 1223. http://dx.doi.org/10.3390/jmse10091223.
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Ionic liquids (IL) are regarded as the solution to the modern world’s need to create and use compounds that exhibit a range of desirable properties while having a low environmental impact. However, recent reports are shattering the image of ionic liquids as environmentally friendly substances, especially in relation to the aquatic environment, revealing their potentially toxic effects. To assess the potential environmental impact of ILs, we conducted an experiment involving 1-butyl-3-methylimidazolium chloride ([BMIM]Cl), a substance considered to be the least hazardous among the imidazolium chloride ILs, on Baltic microphytobenthic communities. Microphytobenthos collected from the environment was tested under controlled laboratory conditions, and both the cell counts and the chloroplast condition were used as endpoints. It was shown that [BMIM]Cl at concentrations of 10−3 and 10−2, considered safe based on a cumulative impact assessment, has a negative effect on the condition of the microalgal cells and causes a reduction in population size. Although, under the influence of [BMIM]Cl, only a small proportion of the species was eliminated from the communities, only two species among those important to the communities showed resistance to this compound and eventually began to dominate the communities.
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SANILKUMAR, M. G., A. V. SARAMMA, K. J. JOSEPH, and L. B. CAHOON. "Monsoon Effects on Biomass and Composition of Microphytobenthic Diatoms in the Cochin Estuary, Southwest India." Journal of North Carolina Academy of Science 127, no. 1 (March 1, 2011): 1–12. http://dx.doi.org/10.7572/2167-5880-127.1.1.
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Abstract Microphytobenthos are important primary producers in shallow aquatic ecosystems, but processes regulating this group are poorly understood in comparison to phytoplankton. We examined microphytobenthos at a station in Cochin Estuary for 13 months (February 2005–February 2006) to evaluate effects of the annual southwest monsoon on total biomass, depth distribution and species composition of the microphytobenthos. Significant declines in microphytobenthos and phytoplankton biomass occurred with onset of the southwest monsoon in June 2005. Phytoplankton biomass began to recover before the monsoon rains ended in September 2005, but microphytobenthos biomass recovered only after the rains ended. Microphytobenthos biomass declined throughout the top 5 cm of the sediment column concurrently with declines in abundance of most pennate diatom taxa, particularly larger forms, as well as some macrobenthos taxa. Changes in the microphytobenthos were not consistent with direct effects of the monsoon (changes in salinity, temperature, pH, physical disturbance, and turbidity), but were consistent with the effects of mud deposition by land runoff caused by heavy monsoon rains. These results suggest the hypothesis that sediment loading into estuaries from storm water runoff may have significant negative effects on microphytobenthos and the communities they support.
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Kelly, Julie A., Claire Honeywill, and David M. Paterson. "Microscale analysis of chlorophyll-a in cohesive, intertidal sediments: the implications of microphytobenthos distribution." Journal of the Marine Biological Association of the United Kingdom 81, no. 1 (February 2001): 151–62. http://dx.doi.org/10.1017/s0025315401003496.
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Microphytobenthos are significant primary producers in many coastal systems. It is therefore important to quantify their biomass and productivity. Chlorophyll-a is often used as an index for microphytobenthic biomass. However, complications arise as most studies of sediment properties have been on a millimetre scale, whilst chemical and biological gradients in the surface layers of sediment occur over a microscale. The development of a new technique, the Cryolander (Wiltshire et al., 1997; Wiltshire, 2000), now allows microscale analysis of the sediment surface. Areas of high and low diatom biomass were compared using two coring techniques of different vertical resolution; the Cryolander method, with a vertical resolution of 0·2 mm and plastic core tubes (coarse coring), with a vertical resolution of 5 mm. Results indicated that, except at extreme biomass levels, coarse coring does not detect statistically significant differences in chlorophyll-a between obviously diverse sample sites. This may lead to misinterpretation of seasonal and spatial data when coarse coring is used. Furthermore microscale sectioning allows distinctions to be made between chlorophyll-a measured in the photic zone (photosynthetically active biomass (PAB)) and chlorophyll-a measured below the photic zone (photosynthetically inactive biomass (PIB)), allowing accurate determination of biomass specific primary production.
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Davydov, O. A., and O. V. Kravtsova. "ЕКОЛОГО-МОРФОЛОГІЧНА СТРУКТУРА МІКРОФІТОБЕНТОСУ ОЗЕРА ТЕЛЬБІН." Scientific Issue Ternopil Volodymyr Hnatiuk National Pedagogical University. Series: Biology 80, no. 3-4 (December 1, 2020): 79–84. http://dx.doi.org/10.25128/2078-2357.20.3-4.10.
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The paper considers the findings of studies on ecological-morphological structure of microphytobenthos in Telbin Lake located in the residential community of Kyiv city.
The research study aimed to distinguish ecological-morphological groups of algae in microphytobenthos of the human-impacted waterbody within the urban area and to evaluate the role of microphytobenthos structural components in forming a certain type of algal community.
Microphytobenthos was sampled with the MB-TE microbenthometer within the littoral area at aquatic-vegetation-free sites and within the deep-water area of the lake.
Algae sampling and laboratory processing of samples were performed in accordance with the methods generally accepted in hydrobiology. For diatoms identification permanent slides were made with special high-resolution mounting media. Ecological-morphological groups of benthic algae were distinguished considering the habitats of algae. The relative share in the microphytobenthos species richness was calculated for each group.
The degree of human impact on the lake ecosystem was evaluated according to the proven method, consisting in distinguishing the total number of factors, which most frequently affect the lake ecosystem.
The findings of studies on the ecological-morphological structure of microphytobenthos in Telbin Lake have made it possible to distinguish 7 ecological-morphological groups of algae. The species richness is mainly formed by periphytont and plankton, and benthonts are for the most part represented by the ecological-morphological group of eurytopic littoral diatoms. In the high-degree human impact waterbody (8 points) the share of benthonts’ major ecological-morphological groups in the species richness decreases in 1.6–2 times, and the shares of periphyton and plankton increase 1.3–2-fold respectively, as compared with low-degree human impact waterbody (3 points).
The resulting unstable algal community consisting mainly of species getting to the lake bottom from other habitats is defined as algal aggregation, which is indicative of unfavorable conditions for residential algal flora development.
Various waterbodies of Ukraine can differ significantly in the environmental variables playing a determining role in microphytobenthos structure and abundance.
Microphytobenthos may act as a reliable biological indicator of aquatic ecosystem’s disturbance caused by human pressure upon waterbodies, responding to such pressure with the transformation of its structural elements.
For several waterbodies of Ukraine detailed analysis of microphytobenthos ecological-morphological structure made it possible to characterize bottom algal communities and to distinguish algal cenoses, which allowed to assess ecological state deterioration in different areas of the waterbodies under study.
The information on the microphytobenthos structural components of urban lakes is scarce.
Therefore, studying the ecological-morphological structure of microphytobenthos in various waterbodies within Kyiv city is of high importance.
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Davydov, O. A., and D. P. Larionova. "САНІТАРНО-ГІДРОБІОЛОГІЧНА ХАРАКТЕРИСТИКА ОЗЕРА ВЕРБНЕ ЗА МІКРОФІТОБЕНТОСОМ." Scientific Issue Ternopil Volodymyr Hnatiuk National Pedagogical University. Series: Biology 77, no. 3 (September 24, 2019): 46–51. http://dx.doi.org/10.25128/2078-2357.19.3.6.
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Assessing ecological and sanitary state of aquatic ecosystems, including their trophic and saprobiological status and impact of human factors, is among key objectives in modern hydrobiology.
Apart from common hydrobiological methods (identifying species compositions, calculating algae number and biomass etc), there are specific methods for the assessment of aquatic ecosystems. Bioindication, which is based on aquatic organisms’ response to environmental factors, including human factors, is the most important.
Microphytobenthos is highly sensitive to changes in natural and human factors. Its bioindication capabilities are widely known, therefore studying them as part of sanitary and hydrobiological characteristics of various water bodies is of great interest.
Water basins across the City of Kyiv are under diversified human impact including various factors and effects, which differ in pressure degree. Thus, using microphytobenthos for sanitary and hydrobiological assessment, even within one type of water basins, has certain aspects, which depend on the bottom algal communities’ stability or degree of transformation. It is often caused by trophic and topic competition between microphytobenthos, phytoplankton and higher aquatic plants, as the latter two can inhibit growth of bottom algae.
In the view of the above, special attention should be paid to quantitative characteristics of benthonts, which may act as cenose-forming organisms. The paper examines the findings of the studies on microphytobenthos in Verbne Lake, which is affected by negative human factor – contamination by surface and ground flow from Kyiv City area and is intensively used for recreation.
The objective is to study the sanitary and hydrobiological characteristics and ecological quality of Verbne Lake according to microphytobenthos’ biondication indices.
Benthic algae were sampled with the MB-TE microbenthometer within the littoral zone in triplicate from the total area of 40 cm2. Algae number was calculated on a counting plate in a 0.1 cm3 drop, their biomass was calculated according to geometric similarity method. Trophic and saprobiological values were assessed in accordance with the scale, proven for microphytobenthos. Saprobity index was calculated according to the Pantle-Buck method in Sladecek modification on the grounds of traditional and modern data on saprobity indicator algae.
Benthonts, planktonts and periphytonts were distinguished with consideration taken of their association with particular habitats. Ecological classification of water quality was performed on the grounds of saprobity bioindication (saprobity indices) according to microphytobenthos. For microphytobenthos’ structural components their role in species richness, number and biomass were analyzed.
Proceeding from the obtained findings, sanitary and hydrobiological characteristics of Verbne Lake were presented according to microphytobenthos. On the whole, the lake can be classified as mesotrophic, β-mesosaprobic water body. Benthonts proved to play an essential part in forming microphytobenthos’ indicatory characteristics. Intensive phytoplankton growth in the water column and its sedimentation upon the lake bottom inhibit development of benthic algal forms. In accordance with the ecological water quality classification based on microphytobenthos saprobity bioindication results (saprobity indices), the water of Verbne Lake relates to Water Quality Class II, Water Quality Category 3. The most unfavorable situation within the lake’s littoral area was registered in summer, which signals that self-purification processes are becoming less intensive and the aquatic ecosystem state is getting worse.
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Polsenaere, P., E. Lamaud, V. Lafon, J. M. Bonnefond, P. Bretel, B. Delille, J. Deborde, D. Loustau, and G. Abril. "Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Correlation over a temperate intertidal flat and their relationships to net ecosystem production." Biogeosciences Discussions 8, no. 3 (June 6, 2011): 5451–503. http://dx.doi.org/10.5194/bgd-8-5451-2011.
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Abstract. Measurements of carbon dioxide fluxes were performed over a temperate intertidal mudflat in southwestern France using the micrometeorological Eddy Correlation (EC) technique. EC measurements were carried out in two contrasting sites of the Arcachon lagoon during four periods and in three different seasons (autumn 2007, summer 2008, autumn 2008 and spring 2009). In this paper, spatial and temporal variations in vertical CO2 exchanges at the diurnal, tidal and seasonal scales are presented and discussed. In addition, satellite images of the tidal flat at low tide were used to link the net ecosystem exchange (NEE) with the occupation of the mudflat by primary producers, particularly by Zostera noltii meadows. CO2 fluxes during the four deployments showed important spatial and temporal variations, with the lagoon rapidly shifting from a sink to a source of CO2. CO2 fluxes showed generally low negative (influx) and positive (efflux) values and ranged from −13 to 19 μmol m−2 s−1 at maximum. Low tide and daytime conditions were always characterised by an uptake of atmospheric CO2. In contrast, during immersion and during low tide at night, CO2 fluxes where positive, negative or close to zero, depending on the season and the site. During the autumn of 2007, at the innermost station with a patchy Zostera noltii bed (cover of 22 ± 14 % in the wind direction of measurements), CO2 influx was −1.7 ± 1.7 μmol m−2 s−1 at low tide during the day, and the efflux was 2.7 ± 3.7 μmol m−2 s−1 at low tide during the night. A gross primary production (GPP) of 4.4 μmol m−2 s−1 during emersion could be attributed mostly to microphytobenthic communities. During immersion, the water was a source of CO2 to the atmosphere, suggesting strong heterotrophy or resuspension of microphytobenthic cells. During the summer and autumn of 2008, at the central station with a dense eelgrass bed (92 ± 10 %), CO2 uptakes at low tide during the day were −1.5 ± 1.2 and −0.9 ± 1.7 μmol m−2 s−1, respectively. Nighttime effluxes of CO2 were 1.0 ± 0.9 and 0.2 ± 1.1 μmol m−2 s−1 in summer and autumn, respectively, resulting in a GPP during emersion of 2.5 and 1.1 μmol m−2 s−1, respectively, attributed primarily to the seagrass community. At the same station in April 2009, before Zostera noltii started to grow, the CO2 uptake at low tide during the day was the highest (−2.7 ± 2.0 μmol m−2 s−1) and could be attributed to microphytobenthos dominance on NEP in this case. NEE versus PAR relationships for data ranked by wind directions were generally negative where and when Zostera noltii was dominant and positive when this community was minor. The latter relationship suggests important processes of photo-acclimatisation by the microphytobenthos, such as migration through the sediment. Influxes of CO2 were also observed during immersion at the central station in spring and early autumn and were apparently related to phytoplankton blooms occurring at the mouth of the lagoon, followed by the advection of CO2-depleted water with the tide. Although winter data would be necessary to determine a precise CO2 budget for the lagoon, our results suggest that tidal flat ecosystems are a modest contributor to the CO2 budget of the coastal ocean.
Dissertations / Theses on the topic "Microphytobentho"
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Coelho, Helena Isabel Soares Dinis. "Microphytobenthos vs Hydrobia: trophic coupling in estuarine environment." Doctoral thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/3632.
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Doutoramento em BiologiaOs estuários são ambientes complexos, biologicamente diversos e muito importantes no que respeita à produtividade primária. As zonas intertidais destes ecossistemas são ocupadas por organismos que possuem uma elevada capacidade de sobrevivência e adaptação face às variadas e rápidas alterações nos factores ambientais (tais como temperatura, salinidade, conteúdo hídrico, etc.). As cadeias tróficas com origem no ecossistema estuarino bentónico são essencialmente herbívoras, regulando o fluxo de energia desde o fundo sedimentar e através do ecossistema. Nas áreas estuarinas intertidais a produção primária é essencialmente suportada pelo microfitobentos (MPB). Estas comunidades de microalgas bênticas constituem uma importante fonte de matéria orgânica e são por si só a principal fonte alimentar para as populações de Hydrobia. Neste contexto, a interacção MPB - Hydrobia é um modelo-chave na investigação da cadeia trófica estuarina de origem bentónica, actuando como um importante canal de transporte de energia para os níveis tróficos superiores, especialmente se considerarmos que Hydrobia é uma importante presa para peixes, aves e caranguejos. O presente estudo tem por objectivos gerais: i) a investigação do controlo ambiental (particularmente da luz e do teor em água do sedimento) e endógeno na migração vertical do MPB e ii) a identificação e potencial utilização de marcadores tróficos (pigmentos e ácidos gordos) úteis à investigação da interacção MPB – Hydrobia em laboratório e em condições naturais, considerando a existência de uma elevada plasticidade trófica por parte da Hydrobia e a elevada densidade populacional que estes organismos podem apresentar. A primeira fase de investigação resultou na comparação do papel dos estímulos ambientais e do controlo endógeno nos padrões de comportamento migratório vertical do microfitobentos, demonstrando a existência de um controlo essencialmente endógeno na formação e desintegração do biofilme superficial. A regulação e manutenção da biomassa à superfície do sedimento são claramente controladas pela variação dos factores ambientais, em especial da luz, cuja presença é essencial à formação total do biofilme microalgal à superfície do sedimento intertidal. Foi proposta uma nova abordagem metodológica com vista à estimativa nãodestrutiva do teor de água de sedimentos intertidais vasosos , possibilitando o estudo da influência da acção do vento no conteúdo hídrico dos sedimentos e o consequente impacto da dessecação na comunidade microfitobêntica. Observou-se que a dessecação provoca efeitos limitantes não só na biomassa superficial mas também na actividade fotossintética dos biofilmes microfitobênticos, conduzindo à diminuição da produtividade primária. No que respeita à dinâmica trófica da interacção MPB - Hydrobia foi estabelecido o uso do pigmento feoforbide a, quantificado nas partículas fecais da fauna, como marcador trófico que permite estimar a quantidade de biomassa de microalgas (clorofila a) incorporada pelos organismos animais.Para tal foi investigada e comprovada a existência de uma relação significativa entre a concentração de feopigmentos excretados e a concentração de clorofila a ingerida. Estes estudos foram desenvolvidos numa primeira fase à escala diária, considerando os efeitos dos ciclos sazonais, dia-noite e maré, e depois com a validação em condições naturais, numa escala mensal. A taxa de ingestão média de indivíduos de H. ulvae varia ao longo do dia, com o máximo em torno dos períodos diurnos de maré baixa, o que pode estar relacionado com a disponibilidade de MPB. As taxas de ingestão (TI) de H. ulvae variam ainda em função da estação do ano (TI verão > TI primavera) e em função da densidade de indivíduos (> densidade, < ingestão). Verificou-se um efeito negativo na concentração de clorofila disponível após herbívoria independentemente da densidade de indivíduos. Finalmente, a comparação dos perfis de ácidos gordos de H. ulvae provenientes de diferentes habitats com os perfis de potenciais fontes alimentares permitiu demonstrar que os ácidos gordos são ferramentas úteis na identificação do habitat ocupado por estes organismos. No entanto, apesar da ocupação de diferentes habitats e da integração de múltiplas fontes de produção primária na sua dieta foram sempre observados significativos níveis de ácidos gordos específicos de microalgas (em particular diatomáceas), reforçando o papel importante das comunidades de microalgas bênticas na dieta das populações de H. ulvae.
Estuaries are biologically diverse and form complex environments, which play an important role on the global primary productivity of aquatic environments. Intertidal areas of estuaries are inhabited by organisms with a strikingly capability to survive and to be adapted to frequent and fast changes in several environmental factors (such as temperature, salinity, water content, etc.). Grazing food chains are common in intertidal mudflats regulating the flow of nutrients and energy from the bottom throughout the estuarine ecosystem. Within intertidal estuarine areas the primary production was predominantly supported by microphytobenthos (MPB). These benthic microalgae assemblages are an important source of organic matter and are a main food source for Hydrobia populations. The MPB - Hydrobia interaction is a key model for the estuarine grazing food chain, acting as a significantly channel of energy to higher trophic levels, since Hydrobia is an important prey item for fish, birds and crabs. The present work addressed: i) the environmental (namely light and sediment water content) and the endogenous control of the vertical migration by microphytobenthos, and ii) the identification and the potential use of trophic markers (pigments and fatty acids) to establish this relationship under laboratory and natural conditions, considering that H. ulvae showed significant trophic plasticity and that mud snails could reach extremely high densities. The role of exogenous cues and endogenous control of the patterns of vertical migratory behavior of intertidal MPB biofilms were compared, showing that the formation and disintegration of the biofilm is endogenously-controlled. The regulation and maintenance of the microalgal biomass at the sediment surface is dependent on the variation of environmental factors, namely light, which is essential for the full formation of the MPB biofilm. A new methodological approach was proposed to estimate the water content of muddy intertidal sediments, enabling the study of the influence of wind on the hydric level of the sediment and the consequent impact of desiccation on the MPB biomass. This investigation showed that desiccation might be responsible to cause important limiting effects on biomass and photosynthetic activity of intertidal MPB biofilms, reducing the primary productivity. Regarding the trophic dynamics of the interaction MPB - Hydrobia, it was established the use of the pigment pheophorbide a, present on Hydrobia ulvae faecal pellets, as a trophic marker to estimate the amount of microalgal biomass incorporated, as chlorophyll a, by benthic macrofauna. A significant relationship between egested pheopigments and ingested chlorophyll a was investigated and validated. These studies were firstly developed on a daily scale, considering the effects of seasonal, tidal and day-night cycles, followed by a validation under natural conditions, on a monthly scale. The mean ingestion rate of H. ulvae individuals varied along the day, with the maximum around the diurnal low tide periods, which may be related with MPB availability. H. ulvae mean ingestion rate (IR) also varies seasonally (IR summer > IR spring) and depending on mud snails density (> density, < ingestion). There was a negative effect on chlorophyll concentration available after grazing, independently of H. ulvae density. Finally, the comparison of fatty acid profiles of mud snails from different habitats with the ones from potential food sources allowed identifying fatty acids as a useful tool to indicate H. ulvae habitat. Although the occupation of different habitats and the integration of multiple primary food sources on mud snails diet, significant inputs of fatty acids specific of microalgae (namely diatoms) were always found, which reinforce the important role of MPB on the diet of H. ulvae populations.
FCT; FSE - SFRH/BD/23720/2005
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Consalvey, Mireille. "The structure and function of microphytobenthic biofilms." Thesis, University of St Andrews, 2002. http://hdl.handle.net/10023/2682.
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Microphytobenthos are the dominant primary producers on estuarine mudflats playing a key role in the functioning of the ecosystem. Studies into microphytobenthic ecology have previously been limited by scale but the advent of fine scale analysis techniques (gm) as well as non-destructive sampling has enabled the system to be examined at a level not previously possible. This study examined the formation, structure and function of microphytobenthic biofilms using non-destructive (remote sensing by PAM fluorescence; fibreoptic light microprofiling) and destructive (cryo-freezing and Low temperature scanning electron microscopy) sampling. Many microphytobenthic organisms are motile and have evolved complex migratory strategies. Microphytobenthic migratory patterns are widely described but much remains to be elucidated about the controlling factors. The fluorescence parameter F015 (minimum fluorescence yield after 15 minutes dark adaptation) was used to monitor short-term changes in biomass at the sediment surface. Light, tidal state, endogeny and combinations thereof were all shown to control migration, demonstrating that predictable migratory rhythms cannot be assumed. Microscale sectioning showed that chlorophyll a was always concentrated in the top 400 gm (the photosynthetically active biomass). Clear migratory patterns were not detected using microscale sectioning therefore indicating that migration occurs over a scale < 400gm. Despite no changes in the chlorophyll a content in the surface layers, LTSEM analysis demonstrated diurnal taxonomic shifts providing circumstantial evidence that microphytobenthic cells sub-cycle at the sediment surface to optimise fitness. The light extinction co-efficient (k) of microphytobenthic biofilms significantly vaned with site, assemblage and also over time. 90% of the surface PPFD had always been attenuated by 400, and in many cases before 200. Traditional microphytobenthic primary productivity models do not account for changes in the spatial and temporal distribution of biomass or light attenuation and therefore their applicability to the real situation may be limited.
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Ginnever, Naomi Elizabeth. "The photophysiology of rocky intertidal microphytobenthic biofilms." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/59459/.
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Rocky shore microphytobenthic biofilms are areas of high biodiversity, and are protected under UK and European Union legislation. Despite this, little is known about the photophysiology of these biofilms. This study aimed to provide a new contribution to microphytobenthic research with the addition of photophysiological knowledge focussing on the rocky intertidal to add to the extensive photophysiological research which has focussed on mudflats. More specifically the photoregulatory mechanisms of rocky shore biofilms had not been studied prior to this work. This study aimed to determine the effects of ambient environmental conditions, community structure and grazing on the photophysiology of the biofilms and elucidate the complex relationships between the abiotic and biotic factors which influence the biofilm. The community structure of the biofilm changed seasonally, with larger species (> 40 μm valve length and > 25 μm diameter) such as Parlibellus delognei being dominant during the winter months (December, January and February) and smaller ones (<40 μm valve length and < 25 μm diameter) such as Navicula bottnica during the spring months (March, April and May) indicating an environmental influence on the community structure of the biofilm. The biofilms were found to die-off (biomass below detection levels) in April and May and grow back in the November and December during a ‘reproductive phase’. An observed photophysiological ‘seasonality’ was primarily the result of the timing of the‘reproductive phase’ of the biofilm, with higher maximum relative electron transport rates (rETRmax) being recorded during November and December (on average 85 compared to 60 relative units), when these biofilms were growing after the spring die-off. High temperature and light dose had a negative effect on the rETRmax, particularly for biofilms on the upper shore sites. It was concluded that the combination of increased temperature and light dose, reducing rETRmax, and so productivity, and increased grazing contributed significantly to the spring dieoff with cells unable to replicate rapidly enough to compensate for increased grazing. By exposing biofilms to different temperatures ex-situ it was found that the lower shore biofilms ii were more resilient to high (> 25 °C) and low (< 10 °C) temperature with a smaller reduction in rETRmax, and ΔF/Fm’ observed in comparison to upper shore. Temperature was found to induce movement in the tube-forming upper shore species Navicula bottnica. This was likely to act as a secondary photoregulation strategy as it was found that high temperatures resulted in a reduced ability to induce non-photochemical quenching (NPQ). Biofilms were also treated with Latrunculin A (LAT-A) and DL- Dithiothreitol (DTT) in situ, and by comparing the photosynthetic patterns of response over an exposure period it was found that the upper shore biofilms utilised NPQ as the primary means of photoregulation whereas the lower shore biofilms utilised cell movement as the primary photoregulatory mechanisms. The upper and lower shore biofilms also utilised secondary mechanisms, migration in the upper shore samples, and NPQ in the lower shore samples, of downregulation, which allowed the cells to persist on the rocky shore where the rapid changes in environmental conditions result in a high stress environment. The overarching conclusion from this study is that rocky shore biofilms utilise a combination of photoregulatory mechanisms dependent upon life form in order to survive in an environment where many rapidly changing biotic and abiotic factors affect the community structure and photosynthesis of the biofilms.
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Larson, Fredrik R. M. "The role of marine microphytobenthos with emphasis of resilience /." Göteborg : Göteborg University, Department of Marine Ecology, 2005. http://www.gbv.de/dms/goettingen/505476940.pdf.
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Weinmann, Birgit Ellen. "Microphytobenthic diversity and function in estuarine soft sediment." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3664.
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Corophium volutator (Pallas) fit the criteria of ‘ecosystem engineers' as defined by Jones and colleagues (1994, 1997): they are widely distributed within and across North Atlantic estuaries, are often present in intertidal soft sediment in vast numbers, and build semi-permanent burrows in the sediment matrix, which they irrigate continuously. Previous studies have demonstrated that C. volutator burrowing and feeding not only modifies the sediment biogeochemistry but can also modify the overlying water biogeochemistry (during immersion). C. volutator activities have also been shown to be detrimental to microphytobenthic (MPB) biofilms in the immediate vicinity of the burrows. As MPB are the stabilizing force in the estuary, the decimation of biofilm destabilizes the habitat for all the organisms colonising it. However, several aspects of C. volutator ecology remain unclear. First, previous studies on the effect of C. volutator on local (within burrow proximity) MPB diversity have not presented a clear signal as to whether they increase or decrease biodiversity or established whether there is preferential survival amongst MPB taxa with certain cell shapes and sizes or lifestyles. Second, as it has been established that C. volutator have the potential to change the water column, it is possible for them to effect MPB populations remotely (outwith burrow proximity). It is therefore of interest to determine the effects they have, whether such an effect can be achieved within a tidal period, and whether these effects can change MPB biomass, behaviour or diversity over time. A series of controlled mesocosm experiments were carried out to quantify those effects of C. volutator on the water column which were likely to impact MPB survival, to determine whether those effects were specific to C. volutator or common to deposit‐feeding bioturbators, to determine to what degree they could be achieved within a single immersion period, and to separate the effects of C. volutator on MPB bulk (chlorophyll-a in top 5 mm) and photosynthesizing (fluorescing) biomass and diversity both ‘locally' and ‘remotely'. The results of the first 3 experiments consistently showed that C. volutator substantially increased the resuspension of sediment to the overlying water column and that the resulting turbidity could reduce lightpenetration to the sediment by as much as 50% within one immersion period. Results of nutrient fluxes were less consistent and clear within and between experiments but there was some suggestion that increased bioirrigation increased inorganic nitrogen flux to the overlying water column in accordance with previous studies. The effects of C. volutator on local and remote MPB biomass (bulk and surface) and diversity varied between experiments but, broadly speaking: (1) bulk biomass was unaffected, reduced locally, or increased remotely; (2) surface biomass was reduced both locally and remotely; and (3) community diversity (Simpson's diversity index) was consistently unaffected, both locally and remotely. Because increased water column turbidity is the most distinctive calling card of C. volutator but is only likely to affect the photosynthetically active (surface) MPB biomass during immersion, a controlled laboratory experiment was designed to examine the extent to which turbidity could influence MPB migratory behaviour and photosynthetic activity. MPB bulk migration was shown to be driven by sitespecific, entrained rhythms of light availability and spatial variation in light availability only drove micro‐cycling in the photic zone during the immersion period. So, in the absence of C. volutator, or any other turbidity producing phenomenon (deep water columns, high flow rates, physical disturbance, etc.), MPB will remain at the surface to photosynthesize during immersion and the productivity during this period is determined by total light intensity and exposure hours (or ‘light dose'). Therefore, the proximity and size of C. volutator populations to a site is likely to be influential in determining local productivity patterns of MPB. In addition, differences in MPB assemblage composition were shown to influence the biofilm productivity but what drives changes in MPB assemblage composition is still unclear and requires further investigation.
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Allison, Jeffrey Garner. "Dynamics of estuarine microphytobenthos in a shallow water sand bottom habitat." [Pensacola, Fla.] : University of West Florida, 2006. http://purl.fcla.edu/fcla/etd/WFE0000004.
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Facca, Chiara. "Phytoplancton et microphytobenthos comme indicateurs de l'état trophique en milieu côtier." Montpellier 2, 2003. http://www.theses.fr/2003MON20148.
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Boulcott, Mat. "The dynamics of carbohydrate production, storage and excretion in epipelic diatoms." Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343503.
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Morelle, Jerome. "Dynamique spatiale et temporelle de la production primaire de l'estuaire de la Seine." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC252/document.
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Les estuaires, de par leur position stratégique à l'interface entre les eaux continentales et les eaux marines jouent un rôle écologique de première importance et sont le siège de nombreuses activités humaines. L’estuaire de Seine est caractéristique des grands estuaires anthropisés. Le management à long terme de ces écosystèmes soumis à des pressions croissantes réside notamment en une meilleure connaissance de la dynamique spatiale et temporelle des réseaux trophiques estuariens. Le phytoplancton et le microphytobenthos sont les principaux contributeurs de la production primaire (PP) dans ces écosystèmes et sont à la base des réseaux trophiques. Ces compartiments sont souvent réduits à la teneur en chlorophylle du milieu et leur productivité n’a jamais été mesurée à l’échelle de l’estuaire de Seine. L’objectif de ces travaux a été d’estimer la PP de ces compartiments le long du gradient halin. Afin d’accéder à des mesures à une haute résolution spatiale, des mesures de fluorescence modulée (PAM) à haute fréquence ont été couplées à des mesures d’incorporation de carbone (13C) à basse fréquence. Les mesures de production primaire ont été mises en perspective avec la dynamique des paramètres physico-chimiques du milieu et la structure communautés phytoplanctoniques déterminés par différentes techniques (microscopie, cytométrie, biologie moléculaire). La dynamique du carbone excrété sous forme de TEP (Transparent Exopolymeric Particules) et EPS (Exopolymeric substances) a également été étudiée pour chacun des compartiments. Au-delà des méthodologies innovantes mises en place qui montre l’intérêt des mesures à haute fréquence dans ces écosystèmes très dynamiques, ce travail apporte une nouvelle vision de la dynamique du phytoplancton et de la richesse spécifique du microbiome estuarien et apporte une estimation fiable de la production primaireThe estuaries play an important ecological role and are the site of many human activities because of their strategic position at the interface between continental and marine waters. Seine estuary is characteristic of large anthropized estuaries. Long-term management requires better knowledge of the spatial and temporal dynamics of the estuarine food webs. Phytoplankton and microphytobenthos are the main contributor of primary production (PP) in these ecosystems and are at the basis of trophic food webs. These compartments are often reduced to the chlorophyll concentration and their productivity has never been measured along the Seine estuary. The objective of this study was to estimate the PP of these compartments along the salinity gradient. In order to access to measurements at high spatial resolution, high-frequency measurements of modulated fluorescence (PAM) were coupled to low-frequency carbon (13C) incorporation measurements. The primary production measurements have been put into perspective with the dynamics of the physical and chemical parameters and the structure of phytoplankton communities determined by different techniques (microscopy, cytometry, molecular biology). The dynamics of carbon excreted as TEP (Transparent Exopolymeric Particles) and EPS (Exopolymeric substances) were also studied for each compartment. Beyond the innovative methodologies which demonstrate the interest of high-frequency measurements in these highly dynamic ecosystems, this work provides a new insight into the phytoplankton dynamics and the specific richness of the estuarine microbiome and provides a reliable estimate of primary production
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Molesky, Thomas J. "Interactions between oyster reefs and adjacent sandflats : effects on microphytobenthos and sediment characteristics /." Electronic version (Microsoft Word), 2003. http://dl.uncw.edu/etd/2003/moleskyt/tommolesky.doc.
Full textBooks on the topic "Microphytobentho"
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Jacco, Kromkamp, ed. Functioning of microphytobenthos in estuaries. Amsterdam: Royal Netherlands Academy of Arts and Sciences, 2006.
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(Editor), Jacco C. Kromkamp, Jody F. C. de de Brouwer (Editor), Gerard F. Blanchard (Editor), Rodney M. Forster (Editor), and Veronique Creach (Editor), eds. Functioning of Microphytobenthos in Estuaries. Edita-the Publishing House of the Royal, 2007.
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Cahoon, Lawrence B. Microphytobenthos in Aquatic Ecosystems: Diverse Habitats, Methodologies, and Research Needs. Elsevier, 2023.
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Serôdio, João, David M. Paterson, Vona Meleder, and Wim Vyverman, eds. Advances and Challenges in Microphytobenthos Research: From Cell Biology to Coastal Ecosystem Function. Frontiers Media SA, 2020. http://dx.doi.org/10.3389/978-2-88966-296-8.
Full textBook chapters on the topic "Microphytobentho"
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Cahoon, Lawrence. "Microphytobenthos." In Encyclopedia of Estuaries, 438. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_291.
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Hubas, Cédric, Claire Passarelli, and David M. Paterson. "Microphytobenthic Biofilms: Composition and Interactions." In Mudflat Ecology, 63–90. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99194-8_4.
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Traunspurger, Walter, and Nabil Majdi. "Species composition and distribution of free-living nematodes in lakes and streams." In Ecology of freshwater nematodes, 58–108. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789243635.0003.
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Abstract This chapter provides an overview of the distributional patterns of nematodes in lakes, rivers, and streams worldwide and of the factors that affect the structuring of nematode communities in the field. Drivers of variability in species composition such as habitat texture, flow rate, temperature, water chemistry, oxygen, vertical distribution of nematodes in the sediment, water depth in lakes, microphytobenthos, macrophytes, heterotrophic microbes, interspecific competition, and predation, are discussed.
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Paterson, D. M., and S. E. Hagerthey. "Microphytobenthos in Constrasting Coastal Ecosystems: Biology and Dynamics." In Ecological Studies, 105–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56557-1_6.
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Perkins, R. G., J. C. Kromkamp, J. Serôdio, J. Lavaud, B. Jesus, J. L. Mouget, S. Lefebvre, and R. M. Forster. "The Application of Variable Chlorophyll Fluorescence to Microphytobenthic Biofilms." In Chlorophyll a Fluorescence in Aquatic Sciences: Methods and Applications, 237–75. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9268-7_12.
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Serôdio, João, and David M. Paterson. "Role of Microphytobenthos in the Functioning of Estuarine and Coastal Ecosystems." In Encyclopedia of the UN Sustainable Development Goals, 894–906. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-319-98536-7_11.
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Serôdio, João, and David M. Paterson. "Role of Microphytobenthos in the Functioning of Estuarine and Coastal Ecosystems." In Encyclopedia of the UN Sustainable Development Goals, 1–13. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-71064-8_11-1.
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Sinha, Swagata, Arnab Banerjee, Nabyendu Rakshit, and Santanu Ray. "Modelling Studies Focusing on Microphytobenthos and Its Role in Benthic-Pelagic Coupling." In Mathematical Analysis and Applications in Modeling, 209–24. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0422-8_19.
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Stal, Lucas J., Simone B. Behrens, Marlies Villbrandt, Stef van Bergeijk, and Finn Kruyning. "The biogeochemistry of two eutrophic marine lagoons and its effect on microphytobenthic communities." In Coastal Lagoon Eutrophication and ANaerobic Processes (C.L.E.AN.), 185–98. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1744-6_15.
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de Jong, D. J., P. H. Nienhuis, and B. J. Kater. "Microphytobenthos in the Oosterschelde estuary (The Netherlands), 1981–1990; consequences of a changed tidal regime." In The Oosterschelde Estuary (The Netherlands): a Case-Study of a Changing Ecosystem, 183–95. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1174-4_15.
Full textConference papers on the topic "Microphytobentho"
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Otani, Sosuke, Sosuke Otani, Akira Umehara, Akira Umehara, Haruka Miyagawa, Haruka Miyagawa, Satoshi Asaoka, et al. "TRANSFER EFFICIENCY FROM PRIMARY PRODUCERS TO RUDITAPES PHILIPPINARUM ON AN INTERTIDAL FLAT IN HIROSHIMA BAY, JAPAN." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93b4af8c32.73166623.
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Fish yields of Ruditapes philippinarum have been decreased and the resources have not yet recovered. It needs to clarify food sources of R. philippinarum, and relationship between primary and secondary production of it. The purpose on this study is to reveal transfer efficiency from primary producers to R. philippinarum and food sources of R. philippinarum. The field investigation was carried out to quantify biomass of R. philippinarum and primary producers on intertidal sand flat at Zigozen beach in Hiroshima Bay, Japan. In particular, photosynthetic rates of primary producers such as Zostera marina, Ulva sp. and microphytobenthos were determined in laboratory experiments. The carbon and nitrogen stable isotope ratios for R. philippinarum and 8 potential food sources (microphytobenthos, MPOM etc) growing in the tidal flat were also measured. In summer 2015, the primary productions of Z. marina, Ulva sp. and microphytobenthos were estimated to be 70.4 kgC/day, 43.4 kgC/day and 2.2 kgC/day, respectively. Secondary production of R. philippinarum was 0.4 kgC/day. Contribution of microphytobenthos to R. philippinarum as food source was 56-76% on the basis of those carbon and nitrogen stable isotope ratios. Transfer efficiency from microphytobenthos to R. philippinarum was estimated to be 10-14%. It was suggested that microphytobenthos might sustain the high secondary production of R. philippinarum, though the primary production of microphytobenthos was about 1/10 compared to other algae.
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Otani, Sosuke, Sosuke Otani, Akira Umehara, Akira Umehara, Haruka Miyagawa, Haruka Miyagawa, Satoshi Asaoka, et al. "TRANSFER EFFICIENCY FROM PRIMARY PRODUCERS TO RUDITAPES PHILIPPINARUM ON AN INTERTIDAL FLAT IN HIROSHIMA BAY, JAPAN." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b431714495f.
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Fish yields of Ruditapes philippinarum have been decreased and the resources have not yet recovered. It needs to clarify food sources of R. philippinarum, and relationship between primary and secondary production of it. The purpose on this study is to reveal transfer efficiency from primary producers to R. philippinarum and food sources of R. philippinarum. The field investigation was carried out to quantify biomass of R. philippinarum and primary producers on intertidal sand flat at Zigozen beach in Hiroshima Bay, Japan. In particular, photosynthetic rates of primary producers such as Zostera marina, Ulva sp. and microphytobenthos were determined in laboratory experiments. The carbon and nitrogen stable isotope ratios for R. philippinarum and 8 potential food sources (microphytobenthos, MPOM etc) growing in the tidal flat were also measured. In summer 2015, the primary productions of Z. marina, Ulva sp. and microphytobenthos were estimated to be 70.4 kgC/day, 43.4 kgC/day and 2.2 kgC/day, respectively. Secondary production of R. philippinarum was 0.4 kgC/day. Contribution of microphytobenthos to R. philippinarum as food source was 56-76% on the basis of those carbon and nitrogen stable isotope ratios. Transfer efficiency from microphytobenthos to R. philippinarum was estimated to be 10-14%. It was suggested that microphytobenthos might sustain the high secondary production of R. philippinarum, though the primary production of microphytobenthos was about 1/10 compared to other algae.
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Kazemipour, F., P. Launeau, and V. Meleder. "Hyperspectral characterization of microphytobenthic biofilms." In 2009 First Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS). IEEE, 2009. http://dx.doi.org/10.1109/whispers.2009.5289006.
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Isaifan, Dina Jamal, and Yousra Suleiman. "Quantifying Biomass of Microphytobenthos in sediments of Mangroves in the east coast of Qatar." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0061.
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Mangroves, Avicennia marina, are highly productive coastal ecosystems with capacity to store carbon within plants and in sediments. Micropytobenthos (MPB) in the sediments also fix carbon and play a significant role in carbon burial. However, there is paucity of information on the role of MPB in coastal carbon budget. We quantified the biomass of MPB as an important carbon pool in the mangrove of Al Thakhira, located at the east coast of Qatar. Sediments at different tidal levels namely, supratidal, intertidal, and subtidal were collected and analyzed for grain size, chlorophyll (a), total carbon, and inorganic carbon contents. Results indicated that sand was the dominant species (60%), followed by silt (39%) and clay (1%) at all tidal levels. While the supratidal level had significantly higher silty sand content, silt dominated the intertidal levels. Moreover, chlorophyll (a) was significantly influenced by tidal levels with highest levels in the subtidal level sediments, where mangroves grow extensively. Results also demonstrated that as we move towards the intertidal zone, the total carbon content in sediments gets higher. Finally, chlorophyll (a) and TOC% were positively associated (r=0.643) in all tidal zones. As we move towards the mangrove subtidal growth area, the total carbon content in sediments gets higher. This work recommends that mangrove forests in Qatar be protected by special sanctuaries and law-enforcement to maintain this natural and dynamic blue carbon ecosystem.
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Merz, Elisa, Judith Klatt, Gregory Dick, Gaute Lavik, Dirk de Beer, and Hannah Marchant. "The dark side of Microphytobenthos: diel dynamics of nitrate respiration in microbial mats and sediments." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6879.
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Richard, Anaïs, Francis Orvain, Jérôme Morelle, Xavier de Montaudouin, and Olivier Maire. "Contrasting influence of bioturbating infauna on biogeochemical sediment dynamics and microphytobenthic primary producers." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5790.
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Choi, Jong-Kuk, Joo-Hyung Ryu, JinAh Eom, and Jae Hoon Noh. "Analysis on the seasonal variations of microphytobenthos distribution in a tidal flat using remotely sensed data." In SPIE Asia-Pacific Remote Sensing, edited by Robert J. Frouin, Hong Rhyong Yoo, Joong-Sun Won, and Aiping Feng. SPIE, 2010. http://dx.doi.org/10.1117/12.873044.
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Kazemipour, Farzaneh, Patrick Launeau, and Vona Meleder. "A new approach for microphytobenthos biomass mapping by inversion of simple radiative transfer model: application to Hyspex images of Bourgneuf Bay." In IGARSS 2010 - 2010 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2010. http://dx.doi.org/10.1109/igarss.2010.5651056.
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