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Temporal Variations of the Chemical Composition of Three Seaweeds in Two Tropical coastal environments

Open Journal of Marine Science 2014年第2期4卷 118-139页

作者： Andyara Nascimento Carina Coelho-Gomes Elisabete Barbarino Sergio Oliveira Lourenco Department of Marine Biology Fluminense Federal UniversityNiteroiBrazil Maria Thereza College NiteroiBrazil Post-Graduate Programme in Chemistry Fluminense Federal UniversityNiteroiBrazil

The seaweeds Chaetomorpha antennina, Gymnogongrus griffithsiae and Ulva fasciata were studied regarding tissue concentrations of total nitrogen, total phosphorus, total protein, hydrosoluble protein, total carbohydrate, chlorophyll a and total carotenoid throughout a 39-month survey in two coastal environments of Rio de Janeiro State, Brazil. One of the sites (Itapuca Stone) has high concentrations of dissolved nutrients and an intense long-term process of cultural eutrophication;the second site (Bananal Inlet) is thought to have lower concentrations of dissolved nutrients and no relevant anthropic impact. Seaweeds experienced changes in the concentrations of the substances in the thalli;however they did not show any cyclic seasonal pattern, except for pigments, with lower values in summer in both sites. The differences found for each species in each sampling at the sites were small (e.g. U. fasciata, more total nitrogen at Itapuca Stone) or absent (e.g. C. antennina, no significant differences for hydrosoluble protein in the sites). Differences in the concentrations of dissolved nutrients in the sites did not generate contrasting chemical profiles in the seaweeds. There is no evidence of nitrogen- or phosphorus-limitation in any season. It is presumable that the concentrations of dissolved nutrients at the nutrient-poorer site are sufficient to generate high concentrations of the substances in the thalli of the species tested, similar to the concentrations measured in the eutrophic site. Experimental data are needed to elucidate the factors that promote the success of the species tested under contrasting nutrient availability and environmental disturbance.

关键词： Chemical Composition coastal environments Dissolved Nutrients Seaweeds Temporal Variations

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Phytoliths of common grasses in the coastal environments of southeastern USA

Phytoliths of common grasses in the coastal environments of ...

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中国科学院地质与地球物理研究所2003学术年会

作者： Kam-biu Liu Department of Geography and Anthropology Louisiana State UniversityBaton RougeLA 70803USA

Thirty-four grass species were collected for phytolith analysis from a variety of coastal environments in the southeastern USA (***,and Louisiana),including salt marshes,freshwater/brackish marshes,pine/oak forests,maritime hardwood forests,and sand *** produced by these modern grasses include a large diversity of shapes and *** propose a preliminary relationship between modern coastal plant communities and their predominant phytolith *** dominant grasses of coastal sand dunes,such as Uniola *** primarily flat tower and two-horned tower *** saddle ellipsoid phytoliths are mainly produced by Spartina *** most common plant in coastal salt *** and spool horned tower phytoliths are common in brackish marsh *** from interdune meadow produce primarily dumbbell *** well as small cross and Cyperaceae-type *** results provide a basis for the interpretation of fossil phytolith assemblages and the reconstruction of coastal environmental changes. (?)2003 Elsevier *** rights reserved.

关键词： phytoliths silica bodies grasses microfossils coastal environments Quaternary southeastern USA

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Knowledge and Opportunities from the Plastisphere:A Prelude for the Search of Plastic Degrading Bacteria on coastal environments

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Sustainable Marine Structures 2021年第2期3卷 15-25页

作者： Luis Felipe Aviles-Ramirez Joanna M.Ortiz-Alcantara Ma.Leticia Arena-Ortiz Faculty of Sciences National Autonomous University of Mexico(UNAM)YucatanMexico Laboratory of Ecogenomic Studies Faculty of SciencesNational Autonomous University of Mexico(UNAM)YucatanMexico

Plastic pollution has become an urgent issue,since its invasion to everyecosystem has led to multiple impacts on the environment and human *** microbial strains and genera had shown the ability to bio-degrade plastic sources under laboratory *** this minireview,wecallect and analyze scientific papers and reports of this microbial activity aswe contextualize this information on the global plastic pollution problem,toprovide an updated state of the art of plastiq/biodegradation with *** with a broad understanding of the general process of plasticbiadegraclation hosted by *** contributions of this mini-revicw came from the identification of rescarch gaps,as well as proposalsfor new *** of the main proposals focuses on coastal environ-nents and in particular coastal wetlands as a great microbiome source withpatential for plastic biodegradation,whether reported or *** proposal consists of the application of this knowledge into technologictools and strategies that have a remarkable impact on the battle against theplastic pollution problem.

关键词： Plastic biodegradation Bacteria Plastisphere Bioremediation coastal environments

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