Bibliografie tematiche / Mangrove swamps

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Letteratura scientifica selezionata sul tema "Mangrove swamps"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Mangrove swamps"

1

Crowley, GM. "Late quaternary mangrove distribution in northern Australia". Australian Systematic Botany 9, n. 2 (1996): 219. http://dx.doi.org/10.1071/sb9960219.

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Abstract (sommario):
Although mangroves have long graced the north Australian coastline, stable sea levels required for the formation of extensive mangrove swamp forests have occurred only intermittently over the late Quaternary. Most ancestral mangrove swamps are likely to have been formed below present sea level. The only well-preserved deposits that have been described, developed on the present continental surface as sea level reached its present position in the early Holocene. Gradual upstream shifting of mangrove communities from about 8400 BP is recorded in sediments from the wet tropics, followed by the establishment of extensive Rhizophora forests over the newly drowned estuaries. More extensive Rhizophora swamps developed in the monsoon tropics where an earlier transitional phase has not been preserved. These 'big swamps' infilled over the next 1500–4500 years as sediments accumulated above the now stable sea level. The present mangrove estate, though more restricted, is fairly stable, with maintenance of mangrove forests in protected prograding bays and in estuaries kept open by adequate river flow. In the short term, mangroves may be threatened by human influences, but any change in climate leading to a gradual change in sea level should again provide conditions for expansion of mangrove habitats across northern Australia.
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S, Guntar Marolop, e Peppy Herawati. "Analisis Kualitas Air Permukaan Rawa Gambut Rasau Bervegetasi Mangrove Di Desa Rantau Panjang Kabupaten Muaro Jambi". Jurnal Civronlit Unbari 5, n. 2 (16 ottobre 2020): 59. http://dx.doi.org/10.33087/civronlit.v5i2.70.

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Peat soil is a type of soil that is formed from the accumulation of plant debris which undergoes a decomposition process. This is why peat soil contains high organic matter and is acidic. Peat soils will affect the parameters of a surrounding aquatic ecosystem, such as the Rasau peat swamp ecosystem in the village of Rantau Panjang. Peat swamp water parameters are influenced by substances stored in the peat such as having a low pH, high heavy metal content, and having high TSS, TDS, BOD and COD values. The water parameter of peat swamp with mangrove vegetation is better than that of peat swamp that does not have mangrove vegetation. This can be seen if the peat swamp water parameters are laboratory tested. The physical parameters of water, namely temperature, TDS, DHL, color, and turbidity were lower in the Rasau peat swamp with mangrove vegetation compared to the non-vegetated ones. The chemical parameters of the Rasau peat swamp with high density mangrove vegetation such as higher pH, and lower BOD, COD, and iron (Fe) when compared to peat swamps without mangrove vegetation. However, the physical and chemical parameters of vegetated and non-vegetated peat swamps are still above the PPRI No. 82 of 2001.
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Rützler, Klaus, e Ilka C. Feller. "Caribbean Mangrove Swamps". Scientific American 274, n. 3 (marzo 1996): 94–99. http://dx.doi.org/10.1038/scientificamerican0396-94.

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4

Villate Daza, Diego Andrés, Hernando Sánchez Moreno, Luana Portz, Rogério Portantiolo Manzolli, Hernando José Bolívar-Anillo e Giorgio Anfuso. "Mangrove Forests Evolution and Threats in the Caribbean Sea of Colombia". Water 12, n. 4 (15 aprile 2020): 1113. http://dx.doi.org/10.3390/w12041113.

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Abstract (sommario):
Colombia has approximately 379,954 hectares of mangrove forests distributed along the Pacific Ocean and the Caribbean Sea coasts. Such forests are experiencing the highest annual rate of loss recorded in South America and, in the last three decades, approximately 40,000 hectares have been greatly affected by natural and, especially, human impacts. This study determined, by the use of Landsat multispectral satellite images, the evolution of three mangrove forests located in the Colombian Caribbean Sea: Malloquín, Totumo, and La Virgen swamps. Mangrove forest at Mallorquín Swamp recorded a loss of 15 ha in the period of 1985–2018, associated with alterations in forest hydrology, illegal logging, urban growth, and coastal erosion. Totumo Swamp lost 301 ha in the period 1985–2018 associated with changes in hydrological conditions, illegal logging, and increased agricultural and livestock uses. La Virgen Swamp presented a loss of 31 ha in the period of 2013–2018 that was linked to the construction of a roadway, alterations of hydrological conditions, illegal logging, and soil urbanization, mainly for tourist purposes. Although Colombian legislation has made efforts to protect mangrove ecosystems, human activities are the main cause of mangrove degradation, and thus it is mandatory for the local population to understand the value of the ecosystem services provided by mangroves.
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Thomas, Martin L. H. "Mangrove swamps in Bermuda". Atoll Research Bulletin 386 (1993): 1–17. http://dx.doi.org/10.5479/si.00775630.386.1.

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George Shwamyil Dasat e Chundusu Elizabeth Sam. "Carbon sequestration and the enzymic latch mechanism in red, black and white mangrove soils of Florida USA". World Journal of Advanced Research and Reviews 13, n. 3 (30 marzo 2022): 421–30. http://dx.doi.org/10.30574/wjarr.2022.13.3.0235.

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Abstract (sommario):
Mangrove swamps are important habitat types providing vital ecological services, such as protection of coastlines from erosion and extreme weather conditions including hurricanes, recycling of nutrients and sequestration of carbon. Mangrove swamps support a wide range of biodiversity, improve water quality, provide fish for local communities. They are also used as a source of wood fuel, medication as well as for harvesting honey for the local population. Soil samples for laboratory analyses were collected from red (Rhizophora mangle), black (Avicennia germinans) and white (Laguncularia racemose) mangroves in Florida, USA to determine the biogeochemistry processes. Results of analyses indicated that the red mangrove soil is the most efficient for carbon sequestration. It had the lowest phenol oxidase activity (206.15 nmol dicq g-1 h-1), highest phenolic concentration (262.33 µg g-1) and lowest hydrolase enzyme activity (β-glucosidase) (3.04 nmol g-1 min-1) and, as a result, the highest concentration of soil organic matter (SOM) (57.9%). It is believed that the high soil water content (84.2%).) of the red mangrove, due to its proximity to the sea, is a key driver of these observations. The 'enzymic latch' mechanism appears to be prevalent in the red mangrove soil, in particular, allowing these ecosystems to be effective at carbon storage hence, could serve as an important natural tool in mitigating the effect of climate change. Preservation and conservation of mangrove swamps is vital in balancing the effect of global warming.
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Dasat, G. S. "Carbon Sequestration and the Enzymic Latch Mechanism in Red, Black and White Mangrove Soils of Florida USA." Advances in Image and Video Processing 12, n. 3 (25 marzo 2024): 411–23. http://dx.doi.org/10.14738/aivp.123.11327.

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Abstract (sommario):
Mangrove swamps are important habitat types providing vital ecological services, such as protection of coastlines from erosion and extreme weather conditions including hurricanes, recycling of nutrients and sequestration of carbon. Mangrove swamps support a wide range of biodiversity, improve water quality, provide fish for local communities. They are also used as a source of wood fuel, medication as well as for harvesting honey for the local population. Soil samples for laboratory analyses were collected from red (Rhizophora mangle), black (Avicennia germinans) and white (Laguncularia racemose) mangroves in Florida, USA to determine the biogeochemistry processes. Results of analyses indicated that the red mangrove soil is the most efficient for carbon sequestration. It had the lowest phenol oxidase activity (206.15 nmol dicq g-1 h-1), highest phenolic concentration (262.33 µg g-1) and lowest hydrolase enzyme activity (β-glucosidase) (3.04 nmol g-1 min-1) and, as a result, the highest concentration of soil organic matter (SOM) (57.9%). It is believed that the high soil water content (84.2%).) of the red mangrove, due to its proximity to the sea, is a key driver of these observations. The 'enzymic latch' mechanism appears to be prevalent in the red mangrove soil, in particular, allowing these ecosystems to be effective at carbon storage hence, could serve as an important natural tool in mitigating the effect of climate change. Preservation and conservation of mangrove swamps is vital in balancing the effect of global warming.
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NAYLOR, ROSAMOND, e MARK DREW. "Valuing mangrove resources in Kosrae, Micronesia". Environment and Development Economics 3, n. 4 (ottobre 1998): 471–90. http://dx.doi.org/10.1017/s1355770x98000242.

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Mangrove ecosystems provide a wide range of market and non-market benefits to coastal communities in the developing world, yet they remain undervalued and overexploited in most regions where they are found. This paper analyzes the use and value of mangroves in Kosrae, Micronesia, where the population is largely dependent on the swamps for fuelwood and other ecosystem services, such as erosion control, storm protection, and nutrient flows to shoreline fisheries. The results show that mangroves on the island are worth between $666 thousand and $1 million per year (1996 prices) based on the net value of marketable products alone. In addition, household survey data suggest that the local people are willing to pay between $1 million and $1.26 million per year to protect and use mangrove swamps indefinitely. The results thus indicate that the population places some premium on the existence and indirect ecosystem services of mangroves, over and above the direct use values. Moreover, respondents generally favored—and were willing to pay more for—a tax system designed to manage and preserve the mangroves' direct and indirect services over a permit system focused only the allocation of direct use over time. Valuation analyses using revealed preference and contingent valuation methods lead to additional conclusions regarding the distribution of benefits, with poor households deriving more direct benefits from—but willing to pay less to protect—mangrove ecosystems.
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I B, Ekerette, Robert B, Nwachukwu K, Laku C. B e Amuzie C. C. "Influence of Habitat Structure and Ecological Zones on Amphibian Diversity in Rivers State, Nigeria". Journal La Lifesci 2, n. 1 (19 aprile 2021): 37–43. http://dx.doi.org/10.37899/journallalifesci.v2i1.335.

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Research on amphibian diversity in Rivers State, Nigeria, was conducted between 2015 and 2019. The survey covered seven Local Government Areas and three ecological zones (lowland forest, freshwater swamp and short mangrove). The surveyed areas were Ikwerre LGA (Isiokpo), Emohua (Rumuji and Ndele), Okrika (Fiberesima Polo, ATC sandfill, Greame Ama), Khana- Ogoni (Bori, Kaani 1), Ogba-Egbema-Ndoni (Omoku), Ahoada East (Ahoada main town, Ikata) and Obio-Akpor (Agbada, Rumuagholu, Rumuesara). The habitats included farmlands, fallow areas, swamps, streams and inundated areas, bush paths, human settlements and forested areas. Visual encounter and acoustic survey methods were used. Nineteen amphibian species were encountered including members of the Arthroleptidae, Bufonidae, Dicroglossidae, Ranidae, Hyperoliidae, Ptychadenidae and Pipidae. Freshwater swamps and short mangrove ecological zones (characterized by human settlements and farmlands) had the lowest diversity of two and five amphibian species, respectively. The highest diversity comprised of eighteen different amphibian species was recorded in forested habitats of the lowland forest/freshwater swamp ecological zone. 569 individuals were collected from lowland forest/freshwater swamp ecological zone; 215 from lowland forest; 60 from short mangrove; and 28 from freshwater swamp ecological zone. Shannon diversity was highest in the lowland/freshwater swamp ecological zone (H=2.12) and lowest in the freshwater swamp zone (H=0.52). It is concluded that a forested habitat comprised of the combination of lowland forest and freshwater swamp ecosystems hosts a greater diversity of amphibian species.
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Griffiths, Lauren N., Elix Hernandez, Elvira Cuevas e William J. Mitsch. "Above- and Below-Ground Carbon Storage of Hydrologically Altered Mangrove Wetlands in Puerto Rico after a Hurricane". Plants 10, n. 9 (20 settembre 2021): 1965. http://dx.doi.org/10.3390/plants10091965.

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Abstract (sommario):
Mangrove wetlands are important ecosystems, yet human development coupled with climate change threatens mangroves and their large carbon stores. This study seeks to understand the soil carbon dynamics in hydrologically altered mangrove swamps by studying aboveground biomass estimates and belowground soil carbon concentrations in mangrove swamps with high, medium, and low levels of disturbance in Cataño, Jobos Bay, and Vieques, Puerto Rico. All three sites were affected by hurricane María in 2017, one year prior to the study. As a result of being hit by the Saffir-Simpson category 4 hurricane, the low-disturbance site had almost no living mangroves left during sampling. There was no correlation between level of hydrologic alteration and carbon storage, rather different patterns emerged for each of the three sites. At the highly disturbed location, belowground carbon mass averaged 0.048 ± 0.001 g-C cm−3 which increased with increased aboveground biomass. At the moderately disturbed location, belowground carbon mass averaged 0.047 ± 0.003 g-C cm−3 and corresponded to distance from open water. At the low-disturbed location, organic carbon was consistent between all sites and inorganic carbon concentrations controlled total carbon mass which averaged 0.048 ± 0.002 g-C cm−3. These results suggest that mangroves are adaptive and resilient and have the potential to retain their carbon storage capacities despite hydrologic alterations, but mass carbon storage within mangrove forests can be spatially variable in hydrologically altered conditions.
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Più fonti

Tesi sul tema "Mangrove swamps"

1

Begum, Fatema. "Mangrove wetlands in Bangladesh /". Title page, table of contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09ENV/09envb418.pdf.

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2

Warren, Janice H. (Janice Helene). "Behavioural ecology of crabs in temperate mangrove swamps". Thesis, The University of Sydney, 1987. https://hdl.handle.net/2123/26768.

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Patterns of distribution of crabs inhabiting burrows in three temperate mangrove swamps near Sydney, New South Wales, were described. Heloeoius cordiformis (an ocypodid) did not exhibit a consistent pattern of distribution among three tidal zones, but was always associated with well— drained mounds of substratum within zones. Paragrapsus laevis (a grapsid) tended to be most abundant in the lower two zones on the shore and usually inhabited burrows in the moist or submerged flats between mounds. Sesarma erythrodactyla (a grapsid) was distributed fairly evenly among the three tidal zones and also between mounds and flats. H. cordiformis hibernated in burrows from June through August or September. Overall abundances also varied seasonally, but trends were inconsistent among the three swamps sampled.
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Hoguane, Antonio Mubango. "Hydrodynamics, temperature and salinity in mangrove swamps in Mozambique". Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318565.

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4

Soliman, Nabil Zaki Gadalla. "Nutrient dynamics at Matapouri Estuary, Northern New Zealand thesis submitted in (partial) fulfilment of the degree of Master of Applied Science, Auckland University of Technology, June 2004". Full thesis. Abstract, 2004.

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5

Bryan-Brown, Dale N. "Seeds, swamps and satellites, connectivity and fragmentation in mangrove forests". Thesis, Griffith University, 2020. http://hdl.handle.net/10072/395542.

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Abstract (sommario):
The earth is undergoing its sixth mass extinction event. This biodiversity crisis is directly attributable to anthropogenic disruptions of ecosystem processes. These disruptions include extracting and killing organisms, clearing habitat, introducing exotic species and disrupting climate at a global-scale. Connectivity is an attribute of both populations and ecosystems which, when disrupted, leads to fragmentation. Fragmented systems often have lower ecological functioning and resilience than connected systems. The maintenance of natural rates of ecological connectivity is a major challenge. Mangroves are intertidal forests which grow along the subtropical and tropical coasts of the world. These forests are extremely valuable; maintaining coastal water quality, protecting shorelines from severe weather events, providing habitat for fisheries species and iconic megafauna, and sequestering blue carbon. Unfortunately, mangrove forests also remain vulnerable to the many human activities competing for space in the coastal zone, and to the effects of sea-level rise (SLR). One of the keys to ensuring mangrove conservation and functioning into the future is a thorough understanding of the connectivity and fragmentation of these systems. This thesis consists of four studies. The first is a comprehensive review of research on marine population connectivity. This study identified that intertidal wetlands are particularly under-represented in the marine connectivity literature. This chapter led to the remaining three chapters which assess fragmentation and connectivity in mangroves. The first of these is a mark-recapture experiment which considers connectivity at the population level. I modelled intra-forest dispersal of mangrove propagules as the interaction between propagule and habitat attributes. I identified interactions and thresholds that determine the capacity for propagules to disperse efficiently. The other two chapters consider mangrove fragmentation at a landscape level. The first of these is an assessment of mangrove fragmentation at a global-scale. I identified regions where loss and fragmentation occur as well as how the dominant land-use change in a region mediates the relationship between loss and fragmentation. In the final chapter, I projected the gain, loss and changing connectivity of mangrove and saltmarsh habitats in southeast Queensland, Australia, given a range of SLR and development scenarios. In this chapter I identify how geographic attributes of coastal regions mediate wetland resilience and vulnerability to climate change scenarios, and demonstrate the threat of SLR to both mangrove and saltmarsh habitats in southeast Queensland. This thesis uses a collection of related chapters to address fragmentation and connectivity in mangroves. My intention is to promote further research into the previously under-studied topic of ecological impacts of fragmentation in mangroves.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Sc
Science, Environment, Engineering and Technology
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Bornman, Eugin. "An appraisal of warm temperate mangrove estuaries as food patches using zooplankton and RNA: DNA ratios of Gilchristella aestuaria larvae as indicators". Thesis, Nelson Mandela University, 2018. http://hdl.handle.net/10948/17908.

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Mangrove habitats are considered as the ideal fish nursery as they are known to increase the growth and survival of juvenile fishes by providing enhanced food availability and protection. However, most studies have focused on tropical mangroves with a few recent warm temperate studies finding conflicting results. Furthermore, the nursery value of South African mangroves to fishes remain understudied in subtropical areas, while warm temperate mangroves are yet to be evaluated. This study aimed to assess whether mangrove presence leads to any advantage to the larvae of an important estuarine resident fish species, Gilchristella aestuaria, by comparing the food patch quality of South African warm temperate mangrove and non-mangrove estuaries. Results indicate that larvae fed primarily on the dominant prey species, Pseudodiaptomus hessei, Paracrtia longipatella, and Acartiella natalensis. However, postflexion larvae consumed more of the larger species, P. hessei, within the two mangrove estuaries (16.09 %V in Nahoon and 13.79 %V in Xhora) than the two nonmangrove estuaries (12.20 %V in Gonubie and 7.05 %V in Qora), despite other prey species occurring at similar densities. Results indicate that mangrove habitats acted as sediment sinks, slightly reducing the turbidity of these estuaries which resulted in postflexion larvae actively selecting larger, more nutritious prey, which in turn, significantly increased their individual instantaneous growth rates (0.11 ± 0.21 Gi) when compared to postflexion larvae in non-mangrove estuaries (0.09 ± 0.12 Gi). This study found that mangrove presence was significantly related to postflexion larval densities when coupled with abiotic (such as temperature and turbidity) and biotic factors (such as predator-prey interactions). Understanding the spatial and temporal dynamics, predator-prey interactions as well as the growth and survival of G. aestuaria is particularly important as they are key zooplanktivores that are prey to other species in estuarine food webs.
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Yerman, Michelle N., University of Western Sydney, of Science Technology and Environment College e School of Natural Sciences. "Temperate urban mangrove forests : their ecological linkages with adjacent habitats". THESIS_CSTE_NSC_Yerman_M.xml, 2003. http://handle.uws.edu.au:8081/1959.7/652.

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Estuarine habitats along the temperate south-eastern shores of Australia are generally made up of salt marsh, mangrove forests and seagrass beds. In urban areas these habitats have been progressively fragmented as a result of population increase and industrial expansion. Salt marshes in particular have been vulnerable to urban expansion and reclamation because of their close proximity to densely populated areas, while mangrove forests have been less often reclaimed because of frequent tidal inundation. The effect of reclamation of salt marshes on the biotic assemblages and functioning of mangrove forests with an adjacent salt marsh, park or bund wall was examined at nine separate locations on the Parramatta River, Sydney NSW. A mensurative approach was used to describe the patterns of distribution and abundance of macro fauna at several temporal and spatial scales. The implications for management are that salt marshes are an integral part of estuaries, and smaller patches of salt marsh are just as important as larger patches in maintaining the diversity of faunal assemblages and ecosystem functioning in mangrove forests in urban areas
Master of Science (Hons)
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Rogers, Kerrylee. "Mangrove and saltmarsh surface elevation dynamics in relation to environmental variables in Southeastern Australia". Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20050816.145618/index.html.

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Ottoni, Júlia Ronzella 1980. "Prospecção e análise funcional de enzimas provenientes de microbiota de manguezais do Estado de São Paulo". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317330.

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Orientadores: Valéria Maia Merzel, Anete Pereira de Souza
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-27T08:16:52Z (GMT). No. of bitstreams: 1 Ottoni_JuliaRonzella_D.pdf: 14116261 bytes, checksum: f49982ceaff5d9b1dd9c87dcf8c01fcf (MD5) Previous issue date: 2015
Resumo: Os manguezais são ecossistemas peculiares de alta atividade biológica, considerados um dos ambientes mais ricos do mundo. No Brasil, os manguezais ainda são pouco estudados, tornando o conhecimento e exploração de micro-organismos e seus metabólitos nesses ecossistemas um tópico importante. Os manguezais são ambientes adversos, caracterizados, em muitos casos, pela alta salinidade, variações constantes de pH e temperatura, e condições anóxicas. Micro-organismos adaptados à essas condições podem ser fontes de moléculas bioativas ainda desconhecidas e de interesse ambiental e econômico. Neste contexto, o presente trabalho teve como um dos objetivos analisar a diversidade taxonômica e funcional presente em sedimento de manguezal contaminado com petróleo através do sequenciamento de uma biblioteca metagenômica construída em vetor do tipo fosmídio. As análises taxonômicas da biblioteca metagenômica mostraram predominância do filo Proteobacteria, seguido por Actinobacteria, Planctomycetes, Firmicutes, Cloroflexi e Bacteroidetes. Em nível de classe, a mais abundante foi Gamaproteobacteria, seguida de Alfaproteobacteria e Deltaproteobacteria. A diversidade taxonômica se reflete na diversidade metabólica, com espécies capazes de degradar hidrocarbonetos, oxidar enxofre em zonas de transição oxica-anóxica costeiras, transformar metais pesados e outros compostos xenobióticos, dentre outras habilidades. Em adição, foram realizadas triagens funcionais com 4.800 clones da biblioteca e 215 isolados bacterianos para esterase e lipase, 5.184 clones para atividade proteolítica e os genomas de duas bactérias foram analisados in silico na busca de genes que codificam para atividade de catalase. As triagens dos clones resultaram em 17 hits positivos para esterases que posteriormente se revelaram falsos-positivos, e 182 hits positivos para proteases nos ensaios com sondas, sendo 60 hits positivos no pH 4,0, 55 no pH 7,0 e 67 no pH 9,0. Nos ensaios com isolados de bactérias foram detectados 42 com atividade de esterase e 20 com atividade de lipase, sendo que a melhor atividade de esterase foi obtida com um isolado de Gordonia sp. e a melhor atividade de lipase foi obtida para um isolado de Bacillus safensis. Estes dois isolados já possuem seus genomas sequenciados e uma análise in silico foi realizada para busca dos respectivos genes de atividade lipolítica. Na busca in silico por catalases foi selecionada uma sequência completa para ensaios de expressão. Foram desenhados pares de primers para amplificação dos genes das três enzimas e, destes, os genes da lipase e da catalase foram expressos, ambos do Bacillus safensis. A caracterização funcional e estrutural foi realizada com a catalase, cujo gene possui 1500 pb, é um tetrâmero composto por 4 monômeros de 59 kDa cada, ativa em intervalo de pH de 6,0 a 12 e temperaturas de 25 ºC a 55 ºC, com atividade ótima em pH 10 e 30 ºC e estável até 40 ºC. Os resultados mostraram que o mangue impactado é composto por populações microbianas adaptadas ao ambiente, e também responsáveis pela degradação de compostos xenobióticos, auxiliando na sua recuperação. A abordagem metagenômica foi bem sucedida nas triagens funcionais para proteases, indicando um grande potencial proteolítico no ambiente. As triagens funcionais com os isolados mostraram a presença de enzimas lipolíticas ativas, e a catalase expressa exibiu características funcionais interessantes, tais como atividade ótima em pH 10 e estabilidade térmica até 40 ºC, com potencial aplicação industrial
Abstract: Mangroves are unique ecosystems of high biological activity and are considered one of the richest environments in the world. In Brazil, mangroves are still poorly studied, making the knowledge of microorganisms and their metabolites in these ecosystems an important topic. Mangroves are harsh environments characterized, in many cases, by high salinity, high pH and temperature variations, and anoxic conditions. Microorganisms adapted to these conditions may be sources of yet unknown bioactive molecules of environmental and economic interest. In this context, one of the objectives of the present study was to analyze the taxonomic and functional diversity present in mangrove sediment contaminated with oil through the sequencing of a metagenomic library constructed using fosmid vector. The taxonomic analysis of the metagenomic library showed predominance of Proteobacteria phylum, followed by Actinobacteria, Planctomycetes, Firmicutes, Chloroflexi and Bacteroidetes. At class level, the most abundant was Gammaproteobacteria, followed by Alphaproteobacteria and Deltaproteobacteria. The taxonomic diversity is reflected in the metabolic diversity, with species capable of degrading hydrocarbons, oxidizing sulfur in oxic-anoxic coastal transition zones, transforming heavy metals and other xenobiotic compounds, among other skills. In addition, functional screenings were performed with 4,800 fosmid clones and 215 bacterial isolates for esterases and lipases, and with 5,184 clones for proteolytic activity and the genomes of two bacteria were analyzed in silico to search for genes encoding catalase activity. The screening of the clones resulted in 17 positive hits for esterases that later proved to be false-positive, and 182 positive hits for proteases using probe-based assays: 60 positive hits at pH 4.0, 55 at pH 7.0 and 67 at pH 9.0. Tests with bacterial isolates yielded 42 positive hits for esterase activity and 20 for lipase activity. The best esterase activity was obtained with one isolate of Gordonia sp. and the best lipase activity was obtained with one isolate of Bacillus safensis. These two isolates have their genomes already sequenced and in silico analyses were performed in the search for the respective genes of lipolytic activity. In silico analysis for catalase genes was performed and a complete sequence was selected for expression assays. Primer pairs were designed to amplify the genes encoding the three enzymes, and of these, lipase and catalase were expressed, both from Bacillus safensis. The functional and structural characterization was carried out with catalase, which gene has 1500 bp, it is a tetramer composed of four monomers of 59 kDa each, active in the pH range from 6.0 to 12 and temperatures of 25 °C to 55 °C, with optimum activity at pH 10 and 30 °C and stable until 40 ºC. The results showed that oil-impacted mangrove is composed by microbial populations adapted to the environment, responsible for the degradation of xenobiotics and assisting in the recovery of the mangrove. The metagenomics approach was successful in the functional screening for proteases, indicating a great proteolytic potential in the environment. Functional screening with the bacterial isolates showed presence of active lipolytic enzymes, and the expressed catalase exhibited unique functional characteristics, such as optimal activity at pH 10 and thermal stability until 40 ºC, with potential industrial application
Doutorado
Genetica de Microorganismos
Doutora em Genética e Biologia Molecular
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D'Alexis, Christophe. "Mesures expérimentales dans les basses couches de l'atmosphère tropicale insulaire (Guadeloupe) : micro-météorologie et composition chimique des masses d'air nocturnes en zone de mangroves". Thesis, Antilles-Guyane, 2011. http://www.theses.fr/2011AGUY0438.

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La présence d'obstacles rencontrés en milieu naturel par l'écoulement, influence la dispersion des polluants qu'il transporte. Cette thèse, fondée sur des mesures micro-météorologiques spatio-temporelles en région tropicale, vise à étudier la dispersion de composés émis par l'écosystème mangrove en fonction des conditions météorologiques. A l'échelle journalière, l'analyse météorologique révéle, outre la présence des Alizés, l'existence d'écoulements thermiques dont des paramètres thermodynamiques nocturnes ont été définis. L'observation terrain nous a montré que la faible intensité du vent défavorise la dispersion des composés émis durant la nuit. A une échelle plus fine, l'existence d'un trou spectral séparant les phénomènes de grande échelle de ceux liés à la turbulence a été mise en évidence. Ces derniers ont été traités par des approches spectrale et statistique pour quantifier les flux turbulents de quantité de mouvement et de chaleur sensible, pendant la nuit, pour une durée de moyenne de l'ordre de 13 minutes. L'état de stratification de la couche de surface a été pris en compte et déterminé par la théorie de similitude de Monin-Obukhov. Les mesures nocturnes effectuées et l'application de la théorie de Kolmogorov ont permis de déduire les taux de dissipation de l'énergie et la taille des tourbillons à 5,5 m d'altitude. Ce travail a également conduit, par l'analyse chromatographique en phase gazeuse couplée à la spectrométrie de masse, à l'identification, en mangrove, de composés organiques volatils soufrés, des organohalogénés, des BTEX, ... L'ensemble de ces résultats servira ultérieurement à alimenter les modèles de dispersion spécifiques liès aux écosystèmes étudiés
The presence of obstacles met in natural environment by the flow, influences the dispersion of air pollutants which it carries. This thesis, based on spatiotemporal micro-meteorological measurements in tropical region, aims at studying the dispersion of compounds emitted by the ecosystem mangrove according to the weather conditions. At a daily scale, the meteorological analysis reveals, besides the presence of Trade Winds, the existence of thermal flows of which nocturnal thermodynamic parameters have been defined. The field observation has shown that the weak intensity of the wind disadvantages the dispersion of compounds emitted during the night. At a finer scale, the existence of a spectral gap separating large scale phenomena of those related to turbulence has been demonstrated. These last ones were treated by spectral and statistical approaches to quantify the turbulent fluxes of momentum and sensible heat during the night, for an averaged duration of 13 minutes. The stratification of the surface layer has been considered and determined by Monin-Obukhov similarity theory. The measurements acquired a night and the application of Kolmogorov theory allowed us to deduct the dissipation rate of energy and the size of the vortices at 5.5 meters in height. This work has also led us, by gas chromatography coupled to mass spectrometry, to identify, in mangrove, sulphurated volatil organic compounds, organohalogen, BTEX, ... Ali these results will later serve to feed dispersion models related to the studied ecosystem
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Libri sul tema "Mangrove swamps"

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Pryor, Kimberley Jane. Mangrove swamps. North Mankato, MN: Smart Apple Media, 2007.

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Sentā, Nettai Nōgyō Kenkyū, a cura di. Tōnan Ajia no teishitchi. Tōkyō: Nōrin Tōkei Kyōkai, 1986.

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Soemodihardjo, Subagjo. Bibliografi beranotasi sumberdaya mangrove Indonesia = Annotated bibliography on Indonesian mangroves. Jakarta: Lembaga Ilmu Pengetahuan Indonesia, Panitia Nasional Program MAB Indonesia, Proyek Penelitian Lingkungaan Hidup, 1989.

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James, Arlington. Freshwater swamps & mangrove species in Dominica. Dominica: Forestry & Wildlife Division, Ministry of Agriculture, 1990.

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Asia-Pacific Symposium on Mangrove Ecosystems (1993 Hong Kong University of Science & Technology). Asia-Pacific Symposium on Mangrove Ecosystems: Proceedings of the international conference held at the Hong Kong University of Science & Technology, September 1-3, 1993. Dordrecht: Kluwer Academic, 1995.

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Mangrove wilderness: Nature's nursery. New York: Dutton Children's Books, 1994.

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Lavies, Bianca. Mangrove wilderness: Nature's nursery. New York: Dutton Children's Books, 1994.

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Pannier, Federico. Manglares de Venezuela. Caracas: Lagoven, 1989.

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Naskar, Kumudranjan. Mangrove swamps of the Sundarbans: An ecological perspective. Calcutta, India: Naya Prokash, 1987.

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Odum, William E. The ecology of the mangroves of south Florida: A community profile. Washington, D.C: Dept. of the Interior, U.S. Fish and Wildlife Service, 1985.

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Capitoli di libri sul tema "Mangrove swamps"

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Wolanski, Eric. "Transport of sediment in mangrove swamps". In Asia-Pacific Symposium on Mangrove Ecosystems, 31–42. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0289-6_5.

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Brunt, M. A., e F. J. Burton. "Mangrove swamps of the Cayman Islands". In The Cayman Islands, 283–305. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0904-8_15.

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Jones, Brian. "Terra Rossa, Phosphate, and Mangrove Swamps". In Geology of the Cayman Islands, 245–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08230-6_10.

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Wolanski, Eric. "Hydrodynamics of mangrove swamps and their coastal waters". In The Ecology of Mangrove and Related Ecosystems, 141–61. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-3288-8_16.

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Fernandes, Marcus E. B. "Phenological patterns of Rhizophora L., Avicennia L. and Laguncularia Gaertn. f. in Amazonian mangrove swamps". In Diversity and Function in Mangrove Ecosystems, 53–62. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4078-2_6.

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Azariah, Jayapaul, Peter Banth, Hilda Azariah e V. Selvam. "Impact of Urbanization on the Status of Mangrove Swamps of Madras". In The Ecology and Management of Wetlands, 225–33. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-9807-7_25.

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e Souza-Filho, Pedro Walfir Martins, Cesar Guerreiro Diniz, Pedro Walfir Martins e Souza-Neto, João Paulo Nobre Lopes, Wilson Rocha da Nascimento Júnior, Luiz Cortinhas, Nils Edvin Asp, Marcus Emanuel Barroncas Fernandes e José Maria Landim Dominguez. "Mangrove Swamps of Brazil: Current Status and Impact of Sea-Level Changes". In The Latin American Studies Book Series, 45–74. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-21329-8_3.

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Lodge, Thomas E., e Stephen E. Davis. "Mangrove Swamps1". In The Everglades Handbook, 111–21. 5a ed. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003266686-10.

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Jana, T. K., R. Choudhuri e A. Choudhury. "Net primary production, biomass turnover and transpiration efficiency of Porterasai coarctata Takeoka in Sundarbans mangrove swamps, India". In Towards the rational use of high salinity tolerant plants, 145–48. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1858-3_14.

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Das, Gautam Kumar. "Mangroves Swamp and Tidal-Marsh Sedimentation". In Tidal Sedimentation of the Sunderban's Thakuran Basin, 141–51. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44191-7_9.

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Atti di convegni sul tema "Mangrove swamps"

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Neely, Samuel, e Anne Raymond. "LEAF DESTRUCTION BY MELAMPUS COFFEUS IN BASIN AND FRINGE MANGROVE SWAMPS, BARNES SOUND, KEY LARGO, FLORIDA: IMPLICATIONS FOR NUTRIENT-CYCLING WITHIN MANGROVE SWAMPS". In 68th Annual GSA Southeastern Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019se-327525.

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Neely, Samuel H., Anne Raymond e Tabitha Solis. "PEAT PARTICLE SIZE DISTRIBUTION: A PROXY FOR PEAT DEPOSITIONAL ENVIRONMENTS IN MANGROVE SWAMPS OF SOUTH FLORIDA". In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-337984.

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Rocha, E. F. C., e M. I. P. Ferreira. "Conservation Units: A Sustainable Proposal for the Mangrove Swamps of Gargaú, Town of São Francisco do Itabapoana/RJ, Brazil". In Workshop on Environmental Management and Sustainability. Macaé, Rio de Janeiro, Brasil: Instituto Federal de Educação, Ciência e Tecnologia Fluminense, 2016. http://dx.doi.org/10.19180/wems-2014-a03.

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Xiao, Kai, Jiapeng Wu, Hailong Li e Yiguo Hong. "SEAWATER-GROUNDWATER EXCHANGE: POTENTIAL ASSOCIATION WITH NITROGEN CYCLING PROCESSES IN A MANGROVE SWAMP". In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-298175.

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Eze, Joy, Oluwarotimi Onakomaiya, Ademola Ogunrinde, Olusegun Adegboyega, James Wopara, Fred Timibitei e Matthew Ideh. "Practical Experience in Rig Move and Workover Operations in an Amphibious Terrain: A Case Study of Escravos Beach Rig Move and Workover Operations". In SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2582947-ms.

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ABSTRACT The exploration and production of oil and gas mostly occurs in remote locations, so as to minimize human exposure and Health Security Safety and Environment (HSSE) risks. Shell Companies in Nigeria is not any different having operated for over 50 years in Nigeria with the largest footprint of all the international oil and gas companies operating in the country spanning over land, swamp, shallow waters and offshore terrains. Shell Petroleum Development Company, the operator of a joint venture (the SPDC JV) between the government-owned Nigerian National Petroleum Corporation – NNPC (55% share), Shell (30%), Total E&P Nigeria Ltd (10%) and the ENI subsidiary Agip Oil Company Limited (5%) focuses mostly on onshore and shallow water oil and gas production in the Niger Delta with about 60+ producing oil and gas fields and a network of approximately 5,000 kilometers of oil and gas pipelines and flow lines spread across the Niger Delta. Escravos Beach is over 60km from the closest major city, Warri, a major oil and gas zone in the Niger Delta. It is bounded by the Escravos River to the East, Chevron canal to the North and the Atlantic Ocean to the South and is covered with predominantly mangrove forest especially along the creeks and consists of a number of natural and man-made waterways (rivers, creeks and canals). Unlike most other onshore operations, this location can only be accessed via the waterways; thus requiring the rig equipment and every other equipment to be channeled via the waterways and subsequently on land to arrive at the site. The amphibious nature of this operation requires a combination of onshore and swamp requirements with increased HSSE exposure, logistics requirement and cost. This paper aims to highlight the practical experience garnered in the rig move and workover operations of Rig XYZ which operated in the Escravos Beach region.
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"Depositional Environment Based on Palynological and Foraminiferous Analysis of The Klasaman Formation in The Salawati Basin Klayili Area Klayili District Sorong Regency West Papua Province". In Indonesian Petroleum Association - 46th Annual Convention & Exhibition 2022. Indonesian Petroleum Association, 2022. http://dx.doi.org/10.29118/ipa22-sg-114.

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The Salawati Basin, West Papua is a mature basin producing oil. One of these basins was filled by sediments from the Klasaman Formation consisting of shale, claystone, sandstone, especially in the northern part there are conglomerates, rarely coral reef limestone deposited in a deltaic to fluvial environment. An a analysis of the depositional environment in the Klasaman Formation provides knowledge on the facies development and depositional environment in the study area. The study was carried out by using the surface geological data such as measured stratigraphy section (MS) with approaches of palynology, foraminiferous and petrography analysis. The development of palynology studies in Indonesia, especially in Eastern Indonesia is still very minimal and can be improved along with the increasing number of oil and gas exploration moving to transitional environments. The results of the analysis show that the Klasaman Formation is Late Miocene-Pliocene (N18) with stratigraphy sorted from the oldest to the youngest units, namely carbonate sandstone units and conglomerate units. The geological structure that developed in the study area was controlled by a structure Klayili Normal Fault which causes a subsidence in the Northwest–North part of the study area and folding in the Southeast, namely Klayili Syncline. Overall facies development as a delta plain environment that show shallowing upward vertical succession with relatively dominant progradation process. Carbonate sandstone as the older unit was deposited in a lower delta plain environment as a tide dominated delta with mangrove vegetation to a peat swamp with freshwater vegetation. There are three facies associated with this unit which are distributed channel, marsh, and interdistributary bay. Conglomerate as the younger unit was deposited in the upper delta plain environment which is influenced by tide-fluvial dominated delta. Several facies associated with this unit are distributary channel, interdistributary bay, swamp, and crevasse splay.
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Xiao, Kai, e Hailong Li. "HYDROCHEMISTRY CHARACTERISTICS OF INTERTIDAL POREWATER: A CASE STUDY IN A MANGROVE SWAMP IN DAYA BAY, CHINA". In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-296543.

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Lemus, Miguel Angel Gallardo, Juan Carlos Rodriguez Ramos e Rodrigo Oliver Delgado Arcega. "IOT Network Proposal for the Identification, Monitoring and Location of Crocodiles in the Estuary of Puerto Vallarta, Jalisco, Mexico". In 9th International Conference on Artificial Intelligence. Academy and Industry Research Collaboration Center (AIRCC), 2023. http://dx.doi.org/10.5121/csit.2023.130715.

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In the city of Puerto Vallarta, in Mexico, there are crocodiles, distributed in the BahÃa de Banderas area, between the states of Nayarit and Jalisco. Man invaded their habitat, forcing them to look for those spaces they naturally occupied, generating confrontations. This work describes and gives the background of the problem, as well as a possible way to mitigate the situation, the use of IOT technology is proposed to monitor the location of each crocodile and the definition of risk zones to warn of possible dangerous situations. Therefore, the design proposal of a network of wireless sensors for the monitoring of crocodiles that are found in the area of the estuary and the Marina, which is an area surrounded by commercial and residential areas, is carried out. The use of a LORA network is proposed, since the coverage of the Coast, mangrove swamp and Marina is around 8 km. Also, a star topology with a single hub and a gateway node was chosen to send the data to a server. A NoSQL database service such as Firebase and data visualization software using React Native are proposed. The data of interest for the project will only be the latitude and longitude provided by the GPS and that will be decoded through an mkr 1300 development card. With the application of the project it is possible to know the behavior of the reptiles, act quickly in case that the crocodiles are outside their natural area and notify Civil Protection.
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Yeo, Darren. "Discovery of high insect diversity in the mangrove and swamp forest remnants of urban Singapore facilitated by NGS barcodes". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.109066.

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