Готові списки джерел за темами / ALGAL BIODIVERSITY

Добірка наукової літератури з теми "ALGAL BIODIVERSITY"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "ALGAL BIODIVERSITY"

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Norton, Trevor A., Michael Melkonian, and Robert A. Andersen. "Algal biodiversity." Phycologia 35, no. 4 (July 1996): 308–26. http://dx.doi.org/10.2216/i0031-8884-35-4-308.1.

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2

Alfaro, Andrea C., W. Lindsey Zemke-White, and Winifereti Nainoca. "Faunal composition within algal mats and adjacent habitats on Likuri Island, Fiji Islands." Journal of the Marine Biological Association of the United Kingdom 89, no. 2 (November 17, 2008): 295–302. http://dx.doi.org/10.1017/s0025315408002774.

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The faunal composition within three mono-specific algal habitats was investigated at Likuri Island, southern Viti Levu, Fiji Islands. Gracilaria maramae was the dominant alga within algal drift mat, seagrass bed, and rocky substrate habitats at the study site. This algal species exhibits two distinctive morphologies depending on whether it is attached or loose-lying. When attached to seagrass blades or rocky substrates, this alga has long straight branches stemming from a single holdfast, while detached individuals develop curled tendrils that re-attach to adjacent substrates. Re-attachment behaviour and high growth rates result in a dense mat of drift algae, which provides a suitable micro-habitat for macro-invertebrates. The sources of algal fragments that contribute to the algal mat appear to be nearby seagrass beds and rocky substrates, where this species may settle directly from spores. Storm events may detach these algae, although pulling experiments showed that the attachment to rocky substrates is 5 times stronger than the attachment to seagrass blades. Results from the macro-faunal samples indicate that the loose-lying algal mat habitat had the highest abundance and biodiversity of organisms, followed by the seagrass bed, and then the rocky substrate habitat. The ability of loose G. maramae fragments to re-attach, along with their high growth rate, may provide a unique micro-habitat for highly abundant and diverse faunal assemblages, which in turn may sustain adjacent near-shore communities. This study highlights the ecological importance of floating algal mats to coastal ecosystems, which should be considered in future management strategies throughout the Fiji Islands.
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Zemke-White, L. W., and E. L. Beatson. "Algal community composition within territories of the damselfish Stegastes nigricans (Pomacentridae, Labroidei) in Fiji and the Cook Islands." South Pacific Journal of Natural and Applied Sciences 23, no. 1 (2005): 43. http://dx.doi.org/10.1071/sp05008.

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The species composition of algal assemblages inside territories of the damselfish Stegastes nigricans was examined from Nananu-i-ra Island, Fiji and Rarotonga, Cook Islands. A total of 32 algal species were identified, the majority of them Rhodophytes (24 species). Seven species were unique to Rarotonga, six were unique to Fiji, with the remaining 19 species recorded at both locations. The biodiversity of territories was similar at both locations. The red alga, Herposiphonia secunda, was the most abundant species found, comprising 40.33% � 3.51SE and 33.94% � 3.58SE from Rarotonga and Fiji respectively. Gelidiopsis intricata, Polysiphonia sp., Aglaothamnion cordatum, and various Cyanophytes were also abundant at both locations. As a group, filamentous algae accounted for 70.35% of the algae found within the territories at all sites. We suggest that if S. nigricans are actively weeding their territories, they are selecting filamentous algae, and particularly Herposiphonia sp. and Polysiphonia sp.
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Barinova, Sophia, Eibi Nevo, and Tatiana Bragina. "Ecological assessment of wetland ecosystems of northern Kazakhstan on the basis of hydrochemistry and algal biodiversity." Acta Botanica Croatica 70, no. 2 (January 1, 2011): 215–44. http://dx.doi.org/10.2478/v10184-010-0020-7.

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Ecological assessment of wetland ecosystems of northern Kazakhstan on the basis of hydrochemistry and algal biodiversity We studied diversity of algae and cyanobacteria in the wetlands of protected natural lakes with salinity ranging from 0.19 up to 32.7 in the arid/semiarid regions of Northern Kazakhstan. In plankton and periphyton of 34 lakes, we found 254 species belonging to 113 genera of 8 algal divisions. The diversity in arid regions is represented by widespread species of diatoms, green algae, and cyanobacteria in similar proportions. Alkaliphiles, among the indicators of acidification, and betamesosaprobionts, among the indicators of saprobity, predominated. The indices of saprobity in lakes varied from 1.47 to 2.7, reflecting low-trophic and low anthropogenically disturbed wetlands. Oligohalobes-indifferents are most common. Highly diverse algal communities were found irrespective of various levels of mineralization. As a consequence of aridization, salinity increase suppressed algal diversity. The mineralization was the most important variable defining the diversity levels, irrespective of the type and location of wetland lakes in the arid regions.
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Fučíková, Karolina, Melissa Taylor, Louise A. Lewis, Brian K. Niece, Aleeza S. Isaac, and Nicole Pietrasiak. "Johansenicoccus eremophilus gen. et sp. nov., a novel evolutionary lineage in Chlorophyceae with unusual genomic features." Plant Ecology and Evolution 156, no. 3 (September 6, 2023): 311–25. http://dx.doi.org/10.5091/plecevo.105762.

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Background – Green algae are a diverse group of photosynthetic eukaryotes, yet are still vastly understudied compared to land plants. For many years, green algae were characterized based on their morphology and life cycles. More recently, phylogenetic and genomic analyses have been added to the phycological toolkit for a better understanding of algal biodiversity and evolutionary history. Material and methods – A desert strain of green algae was isolated from Joshua Tree National Park (JTNP) in southern California as part of a larger biodiversity survey. The alga’s nuclear rRNA genes as well as the chloroplast genome were sequenced, annotated, and analysed in addition to a morphological assessment. Results – Morphologically this strain is especially similar to Pseudomuriella and Rotundella, and its lipid profile resembles that of other soil algae, but phylogenomic analyses demonstrate that it is a distinct evolutionary lineage in Chlorophyceae. The alga exhibits several unusual genomic features, the most remarkable being its highly derived yet apparently functional nuclear rRNA genes, 18S and 28S. Both genes are GC-rich and bear many compensatory base changes to maintain a similar secondary structure to that of other green algae. The chloroplast genome has a distinct gene order and repeat arrangement from other published green algal plastomes, but contains the expected genes and also provides phylogenetically informative data. Conclusion – We conclude that the strain be placed into a new species and genus in the class Chlorophyceae, and propose the name Johansenicoccus eremophilus for this new taxon. Johansenicoccus eremophilus exemplifies science’s insufficient understanding of the range of genomic variations among inconspicuous soil algae.
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Sansone, Clementina, and Christophe Brunet. "Marine Algal Antioxidants." Antioxidants 9, no. 3 (March 2, 2020): 206. http://dx.doi.org/10.3390/antiox9030206.

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Khan, Amna Komal, Humera Kausar, Syyada Samra Jaferi, Samantha Drouet, Christophe Hano, Bilal Haider Abbasi, and Sumaira Anjum. "An Insight into the Algal Evolution and Genomics." Biomolecules 10, no. 11 (November 6, 2020): 1524. http://dx.doi.org/10.3390/biom10111524.

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With the increase in biotechnological, environmental, and nutraceutical importance of algae, about 100 whole genomic sequences of algae have been published, and this figure is expected to double in the coming years. The phenotypic and ecological diversity among algae hints at the range of functional capabilities encoded by algal genomes. In order to explore the biodiversity of algae and fully exploit their commercial potential, understanding their evolutionary, structural, functional, and developmental aspects at genomic level is a pre-requisite. So forth, the algal genomic analysis revealed us that algae evolved through endosymbiotic gene transfer, giving rise to around eight phyla. Amongst the diverse algal species, the unicellular green algae Chlamydomonas reinhardtii has attained the status of model organism as it is an ideal organism to elucidate the biological processes critical to plants and animals, as well as commercialized to produce range of bio-products. For this review, an overview of evolutionary process of algae through endosymbiosis in the light of genomics, as well as the phylogenomic, studies supporting the evolutionary process of algae was reviewed. Algal genomics not only helped us to understand the evolutionary history of algae but also may have an impact on our future by helping to create algae-based products and future biotechnological approaches.
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Kozlova, Ekaterina V., Svetlana E. Mazina, and Vladimir Pešić. "BIODIVERSITY OF PHOTOTROPHS IN ILLUMINATED ENTRANCE ZONES OF SEVEN CAVES IN MONTENEGRO." Ecologica Montenegrina 20 (February 10, 2019): 24–39. http://dx.doi.org/10.37828/em.2019.20.3.

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The biodiversity of the entrance zones of the Montenegro caves is barely studied, therefore the purpose of this study was to assess the biodiversity of several caves in Montenegro. The samples of phototrophs were taken from various substrates of the entrance zone of 7 caves in July 2017. A total of 87 species of phototrophs were identified, including 64 species of algae and Cyanobacteria, and 21 species of Bryophyta. Comparison of biodiversity was carried out using Jacquard and Shorygin indices. The prevalence of cyanobacteria in the algal flora and the dominance of green algae were revealed. The composition of the phototrophic communities was influenced mainly by the morphology of the entrance zones, not by the spatial proximity of the studied caves.
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Andriyani, Nuraina, Arif Mahdiana, Rose Dewi, Yusuf Subagyo, Asrul sahri siregar, Teuku Junaidi, and Taufan harisam. "Biodiversity of algae potentially HABS (Harmfull Algae Blooms) in reservoir Mrica, Banjarnegara." E3S Web of Conferences 47 (2018): 03001. http://dx.doi.org/10.1051/e3sconf/20184703001.

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It has been reported that the waters of the reservoir Mrica-Banjarnegara were mesotropik-hypereutrophic conditions, potential algal bloom is of Division: Cyanophyta is Microcystis; Chlorophyta is pediastrum; Chrysophyceae is Pyrophyta nitzchia and is Ceratium. Research the types of algae that Potentially HABS (harmfull Algae Blooms) has been Carried out as a continuation of the kinds of research that have the potential of algae blooming. Survey methods was used. Sampling was done by purposive sampling, through 5 (five) sampling sites. Data were Analyzed descriptively. The results Showed that the algae are Potentially HABS of the division Cyanophyta are Microcystis, Anabaena, Oscillatoria and phormidium.
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Chou, Jui-Yu, Shao-Lun Liu, Yu-Der Wen, and Wei-Lung Wang. "Phylogenetic analysis of Bangiadulcis atropurpurea (A. Roth) W.A. Nelson and Bangia fuscopurpurea (Dillwyn) Lyngbye (Bangiales, Rhodophyta) in Taiwan." Archives of Biological Sciences 67, no. 2 (2015): 445–54. http://dx.doi.org/10.2298/abs140902009c.

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Samples of the freshwater red algae, Bangiadulcis atropurpurea, collected from the mountain waterfalls and its close species, Bangia fuscopurpurea, collected from coasts, were phylogenetically analyzed. The sequences of the rbcL gene and RuBisCO spacer region of the freshwater Bangiadulcis atropurpurea species were identical or similar to those of B. atropurpurea from Japan, North America and Europe. This result indicated that the freshwater Bangiadulcis species from Taiwan shared a common ancestor with the three above-mentioned populations and formed a distinct clade from the marine Bangia species in the phylogenetic trees. It is suggested that all the previous records on marine Bangia species should be revised and the name B. fuscopurpurea be used for the marine species in Taiwan. In this study, the freshwater alga B. atropurpurea presents a new record in the algal flora of Taiwan. This finding is important for the protection of the biodiversity of red algal flora, and provides useful information on the ecological conservation of the species in Taiwan.
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Більше джерел

Дисертації з теми "ALGAL BIODIVERSITY"

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Nissimov, Jozef I. "Ecological and functional biodiversity in a marine algal-virus system : genotypes, phenotypes and their ecological significance." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13776/.

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Coccolithoviruses are large dsDNA viruses infecting the cosmopolitan calcifying marine phytoplankton Emiliania huxleyi. Therefore they are instrumental components of algal bloom demise and thus agents contributing significantly to biogeochemical cycling in the oceans. Several coccolithovirus strains exist in culture and have been used so far to study the co-evolutionary arms-race between them and their unicellular host in naturally occurring or induced blooms in the North Atlantic Ocean and the fjords of Norway. However, little is known of their distribution in non-bloom conditions, their natural diversity in times of reduced infectivity rates, and the role of functionally important genes found in natural coccolithovirus communities. Even less is known about their genetic differences and the phenotypic consequences of these differences on their infection dynamics. Hence here a three dimensional approach was undertaken, during which the genomes of several coccolithovirus strains were analysed, their diversity in the global ocean characterised, and their phenotypic properties as seen from their infection dynamics with their host established. It was revealed that although coccolithoviruses share a common subset of core genes, they differ in a large proportion of their genomic material, as seen from the presence and/or absence of large sub-clusters of functionally unknown genes. Moreover, a gene that encodes for a phosphate scavenging mechanism (phosphate permease) was truncated from the genome of the Norwegian isolate EhV-99B1 but not from any other strain, while a gene encoding for the virulence factor sialidase was truncated only in the genomes of the English Channel strains isolated in 2001. The discovery of an additional gene that is potentially involved in the regulation of sphingosine and ceramide intermediates during the de novo virus encoded sphingolipid biosynthesis pathway was also intriguing, and the extent of gene homology to host genes (i.e. almost 13% of the analyzed genomes) highlighted the importance of horizontal gene transfer events in the co-evolution between algal hosts and their viruses. Secondly, it was established that virus competition over its resource, the host-cell, is fierce and that during host coinfection, some viruses (i.e. EhV-207) were superior to others (i.e. EhV-86) in their quicker utilisation of the host metabolic machinery and possibly shorter latency period within the infected cells. The biogeochemical and evolutionary implications of these distinct phenotypic properties are far reaching as in the environment there would be hundreds of different virus strains fighting over a few dominant hosts, with “losers” and “winners” coming and going from a particular niche, affecting the recirculation of nutrients and carbon at different rates. Finally, by community fingerprinting cococlithoviruses in the global ocean with phylogenetic markers (major capsid protein) and functional markers (serine palmitoyltransferase) it was discovered that the diversity of these viruses increase with depth, and that the 3D structure of the SPT protein (involved in the propagation of host cell death) differs among strains, dictated by a variant amino acid linker region between the two domains of the protein, LCB1 and LCB2, potentially influencing the efficiency of the virus encoded sphingolipid biosynthesis pathway. This study is an important first step in understanding the role of coccolithoviruses, their evolution, their functional characteristics, and the possible implications of the latter to biogeochemical cycling and global climate and primary production predictions. Articles: Draft genome sequence of the coccolithovirus EhV-84 / Josef I. Nissimov ... [et al.]. Standards in Genomic Sciences, v. 5 (2011), p. 1-11 and Functional inferences of environmental coccolithovirus biodiversity / Josef I. Nissimov ... [et al.]. Virologica sinica (2013), doi: 10.1007/s12250-013-3362-1 have been removed from PDF for the copyright reasons.
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Garvey, Alyssa. "Next-generation sequencing, morphology, and culture-based methods reveal diverse algal assemblages throughout the Florida springs." UNF Digital Commons, 2019. https://digitalcommons.unf.edu/etd/899.

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Algae are a group of highly diverse photosynthetic organisms found in variety of habitats. As the primary energy base in ecosystems, knowledge of the diversity and presence of certain algal lineages is paramount to our understanding of the trophic state of aquatic habitats. In recent years, the state of Florida has seen an increase of both marine and freshwater algal blooms. Similarly, filamentous algae have begun outcompeting vascular macrophytes throughout many of Florida’s springs as nutrient enrichment from anthropogenic sources increases. Traditionally, the Florida algal spring communities have been assessed using classic morphological methods, which may underrepresent the true biodiversity present. Therefore, the goal of this study was to conduct a more complete diversity assessment implementing next-generation sequencing techniques (NGS) with morphological analyses and culturing methods. While morphological methods identified a wide variety of algal taxa, belonging to 4 phyla (Bacillariophyta, Charophyta, Chlorophyta, and Cyanobacteria), next-generation sequencing techniques provided greater detail of the diatom community. This is particularly important as many diatom taxa are used as indicators of water quality. We noted discrepancies between these two methods, highlighting how NGS techniques may complement the use of morphological analyses when analyzing algal diversity in this system. Culturing methods also revealed the presence of two taxa new to science (Nodosilinea fontisand Brasilonema variegatus), indicating these springs may represent a potential source of novel cyanobacteria. Taken together, this study showcases Florida springs are rich in algal diversity and a combination of methods is required for more complete biodiversity assessments. Future studies implementing such methods will aid in the preservation and conservation of these ecosystems.
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Hallmann, Christine Verfasser], Thomas [Akademischer Betreuer] [Friedl, and Michael [Akademischer Betreuer] Hoppert. "Biodiversity of terrestrial algal communities from soil and air-exposed substrates using a molecular approach / Christine Hallmann. Betreuer: Thomas Friedl. Gutachter: Thomas Friedl ; Michael Hoppert." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/108912368X/34.

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Verhulst, Stephanie. "Response of the Epiphytic Algal Communities to Experimentally Elevated Nutrient Levels in Intertidal Salt Marsh Habitats." UNF Digital Commons, 2013. http://digitalcommons.unf.edu/etd/435.

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Epiphytes are organisms attached to plants and are responsible for the majority of primary productivity in many aquatic systems. While epiphytes serve as a valuable food resource to herbivores, they may prove deleterious to the host plant by competing for light and nutrients, as well as increasing sheer stress. This study evaluated the impacts of nutrient additions, nitrogen and phosphorus, on the epiphytic algal community on Spartina alterniflora over the course of two growing seasons. Three nutrient treatments (N, P, and N+P) and one control treatment were placed in a salt marsh in the Tolomato River during the growing seasons of 2011 and 2012. To assess community development, we examined biomass, ash-free dry mass (AFDM), chlorophyll-a levels, cell counts, and community diversity by algal division. The nutrient additions did not significantly alter any of the measured parameters in either sampling year. However, the sampling month did have a significant (pa, and community composition. A total of 155 infrageneric taxa were identified. Biomass tended to be dominated by diatoms and red algae, while cyanobacteria were most abundant. In both years, biomass was highest in the spring with a second smaller pulse in the fall. Conversely, chlorophyll-a levels varied between the years and did not show the same monthly patterns as AFDM. A laboratory study subjecting S. alterniflora to the same nutrient additions also found no significant effects of increased nutrients, but did observe temporal changes in biomass and chlorophyll-a levels. Overall, epiphytic growth was not influenced by nutrient additions in this study suggesting that this and other similar salt marsh systems may be resilient to anthropogenic eutrophication. Instead, other factors, such as light and herbivory, likely played a key role in determining epiphytic algal growth and community composition.
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Turunen, J. (Jarno). "Responses of biodiversity and ecosystem functions to land use disturbances and restoration in boreal stream ecosystems." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526217826.

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Abstract Streams and rivers have been extensively altered by humans. Channelization and land use have changed stream habitats and water quality with adverse effects on biota and ecosystem functions. Impacted streams have been targets for restoration, but there is considerable lack of understanding how streams should be restored in an ecologically effective way. In this doctoral thesis, I studied the impacts of channelization (for timber floating) and agricultural diffuse pollution on stream biota. I also studied the effectiveness of restorations of forestry impacted streams stressed by excessive sand sedimentation from catchment drainage. Finally, I also studied the effects of mosses, fine sediment and enhanced dispersal on stream macroinvertebrate communities and ecosystem functions. I found that channelization did not have effect on diatom, macrophyte, macroinvertebrate and fish assemblages, whereas diffuse pollution had strong effects, with no interactions between the two stressors. I showed that excessive sedimentation from forest drainage was harmful for stream biota but had no effect on leaf decomposition and algal accrual rate. Restoration with boulders reduced sand cover and was more beneficial for in-stream biodiversity, whereas restoration with wood tended to increase hydrological retention of stream channels, thereby altering riparian plant assemblages toward more natural composition. In a mesocosm experiment, I found mosses to have a strong impact on macroinvertebrate communities and ecosystem functions. Mosses increased organic matter retention and reduced algal accrual rate and leaf decomposition. The effect of mosses on macroinvertebrates was stronger than that of sand sedimentation, and mosses mitigated some of the negative effects of sand. Extensive dispersal had a distinct imprint on invertebrate community composition but did not blur the effect of mosses and sand on communities, suggesting strong local-scale environmental control of composition. My thesis emphasizes that priority in stream restoration should be in the mitigation of diffuse pollution rather than restoration of channel morphology, especially in streams where channel alteration has been fairly modest, as in the case of timber floating. Addition of both boulders and large wood likely yields the best biodiversity response in the restoration of forestry impacted streams. Mosses are a key component of boreal lotic ecosystems; therefore, the recovery of mosses may be a prerequisite for the full recovery of biodiversity and ecosystem integrity of boreal streams
Tiivistelmä Ihmisen toiminta on laajasti muokannut virtavesiä. Uomien kanavointi ja maankäyttö ovat muuttaneet virtavesien elinympäristöjä ja veden laatua, millä on ollut haitallisia vaikutuksia virtavesien luonnon monimuotoisuuteen ja ekosysteemin toimintaan. Huonokuntoisia virtavesiä on kunnostettu paljon, mutta ymmärrys siitä, kuinka virtavesiä tulisi kunnostaa parhaan ekologisen lopputuloksen saavuttamiseksi, on edelleen vajaata. Tutkin tässä väitöskirjassa uittoperkausten ja maatalouden hajakuormituksen merkitystä ja yhteisvaikutusta virtavesien eliöyhteisöihin. Tutkin myös kunnostusten vaikutusta hiekasta kärsivissä metsätalouden muokkaamissa puroissa, sekä vesisammalten, hiekan ja eliöiden levittäytymisen merkitystä purojen pohjaeläinyhteisöjen ja ekosysteemin toimintojen muovautumisessa. Havaitsin, että uoman perkauksilla ei ollut vaikutusta virtavesien eliöyhteisöihin, mutta hajakuormituksen vaikutus oli voimakas. Perkauksella ja hajakuormituksella ei ollut yhteisvaikutuksia eliöyhteisöihin. Osoitin, että metsäojituksista aiheutuva ylimääräinen hiekan sedimentaatio on haitallista virtavesien eliöille, mutta sillä ei ollut vaikutusta lehtikarikkeen hajotukseen tai päällyslevien tuotantoon. Kunnostukset joissa käytettiin kiveä vähensivät hiekan peittävyyttä ja olivat hyödyllisempiä uoman eliöstölle kuin kunnostukset, joissa tehtiin puurakennelmia. Puukunnostukset kuitenkin lisäsivät uoman vedenpidätyskykyä ja siten muokkasivat rantavyöhykkeen kasvillisuutta luonnontilaisemmaksi. Havaitsin, että vesisammalilla on voimakas vaikutus pohjaeläinyhteisöjen koostumukseen. Sammalet vaikuttivat ekosysteemin toimintoihin lisäämällä eloperäisen aineksen pidättymistä ja vähentämällä lehtikarikkeen hajotusta ja päällyslevien tuotantoa. Sammalten vaikutus pohjaeläimiin oli voimakkaampi kuin hiekan, ja sammalet kykenivät jopa lieventämään joitakin hiekan negatiivisia vaikutuksia. Eliöiden levittäytymisellä oli selvä vaikutus yhteisöjen koostumukseen, mutta se ei hävittänyt hiekan ja sammalen vaikutusta, mikä viittaa korkeaan ympäristötekijöiden merkitykseen yhteisöjen rakentumisessa. Tutkielmani korostaa, että maatalousjokien tilan parantamisessa hajakuormituksen hallinta tulisi olla ensisijainen kunnostustavoite uoman rakenteen kunnostamisen sijaan. Metsätalouden vaikutuksista kärsivissä puroissa kivi- ja puumateriaalin käyttö samanaikaisesti tuottaa luultavimmin laajimman vaikutuksen purojen monimuotoisuuteen. Sammalilla on merkittävä vaikutus muiden eliöiden yhteisökoostumukseen ja ekosysteemin toimintoihin, joten sammalten palautuminen on tärkeä kunnostustavoite virtavesissä, joissa on luonnostaan paljon sammalkasvustoa
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Ferro, Yannis. "Évaluation de l'impact des rejets urbains de temps de pluie sur le compartiment algal des écosystèmes aquatiques : Mise au point d'outils pour la surveillance des milieux récepteurs." Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00994535.

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La gestion des eaux pluviales constitue un défi important à relever dans les villes du monde entier : aujourd'hui on ne compte plus les problèmes d'inondation et de pollution, problèmes chroniques qui tendent à s'amplifier à mesure que l'urbanisation grandit en parallèle du changement climatique. Une gestion durable de ces eaux est au cœur des enjeux du XXIe siècle et afin de faire face à ces problèmes le Ministère de l'Écologie et du Développement Durable a engagé une opération de recherche sur cette thématique. Parmi les problèmes posés par les eaux pluviales, notre étude se focalise sur les rejets urbains de temps de pluie (RUTP). Ces rejets constituent un apport important et imprévisible de nombreux polluants pour les masses d'eaux réceptrices. La pollution des RUTP est étudiée depuis de nombreuses années et, alors que les connaissances en la matière s'affinent, il n'existe à l'heure actuelle aucune étude de grande ampleur permettant d'identifier l'impact des RUTP sur les écosystèmes récepteurs. Notre travail a consisté à étudier l'impact environnemental de différents échantillons de RUTP collectés sur 3 sites d'assainissement pluvial de l'agglomération lyonnaise. Pour cela nous avons sélectionné des bioindicateurs pertinents, les microalgues d'eau douce, organismes unicellulaires à la base des chaînes trophiques et très sensibles aux polluants présents dans les RUTP. Nous avons réalisé des bioessais écotoxicologiques connus de la littérature et contribué au développement de nouveaux indicateurs de toxicité complémentaires. De plus nous avons cherché à adapter ces bioessais pour permettre leur utilisation sur le terrain. En parallèle nous avons travaillé à l'amélioration d'un biocapteur enzymatique à cellules algales. Ses performances ont été évaluées sur des échantillons de RUTP avant d'œuvrer à la construction d'une station automatisée qui nous a permis de réaliser des mesures directement sur les sites d'assainissement (on line monitoring). Ce travail contribue à mettre en évidence l'impact important des RUTP sur le milieu récepteur tout en confirmant le caractère hétérogène de ce type d'effluent et l'intérêt des dispositifs de surveillance in situ.
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7

Alestra, Tommaso. "Impacts of altered physical and biotic conditions in rocky intertidal systems: implications for the structure and functioning of complex macroalgal assemblages." Thesis, University of Canterbury. School of Biological Sciences, 2014. http://hdl.handle.net/10092/10025.

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Complex biogenic habitats created by large canopy-forming macroalgae on intertidal and shallow subtidal rocky reefs worldwide are increasingly affected by degraded environmental conditions at local scales and global climate-driven changes. A better understanding of the mechanisms underlying the impacts of complex suites of anthropogenic stressors on algal forests is essential for the conservation and restoration of these habitats and of their ecological, economic and social values. This thesis tests physical and biological mechanisms underlying the impacts of different forms of natural and human-related disturbance on macroalgal assemblages dominated by fucoid canopies along the east coast of the South Island of New Zealand. A field removal experiment was initially set up to test assemblage responses to mechanical perturbations of increasing severity, simulating the impacts of disturbance agents affecting intertidal habitats such as storms and human trampling. Different combinations of assemblage components (i.e., canopy, mid-canopy and basal layer) were selectively removed, from the thinning of the canopy to the destruction of the entire assemblage. The recovery of the canopy-forming fucoids Hormosira banksii and Cystophora torulosa was affected by the intensity of the disturbance. For both species, even a 50% thinning had impacts lasting at least eighteen months, and recovery trajectories were longer following more intense perturbations. Independently of assemblage diversity and composition at different sites and shore heights, the recovery of the canopy relied entirely on the increase in abundance of these dominant fucoids in response to disturbance, indicating that functional redundancy is limited in this system. Minor understory fucoids, which could have provided functional replacement for the dominant habitat formers, had reduced rates of growth or recruitment when the overlying canopy was disturbed. I then used a combination of field and laboratory experiments to test the impacts of physical and biotic stress sources on the dominant fucoids H. banksii and C. torulosa. The large fucoid Durvillaea antarctica was also included in one of the laboratory investigations. I assessed how altered physical and biotic conditions affect these important habitat formers, both separately and in combination. Physical stressors included increased sedimentation, nutrient enrichment and warmer water temperatures. Biotic stress originated from interspecific competition with turfs of articulated coralline algae and ephemeral, fast-growing green and brown algae. Sediment deposition severely reduced the survival and growth of recently settled H. banksii, C. torulosa and D. antarctica germlings in laboratory experiments. In the field, the recruitment of H. banksii on unoccupied substrates was significantly higher than in treatments in which sediments or mats of turf-forming coralline algae covered the substrate. This shows that sediment deposition and space pre-emption by algal turfs can synergistically affect the development of fucoid beds. Further impacts of sediment accumulation in the benthic environment were investigated using in situ and laboratory photorespirometry techniques to assess the contribution of coralline algae to assemblage net primary productivity (NPP), both in the presence and absence of sediment. The NPP of articulated corallines was reduced by sediment. Sediment accumulation among the thalli limited the access of the corallines to the light and induced photoinhibitive mechanisms. In the absence of sediment, however, coralline algae enhanced the NPP of assemblages with a fucoid canopy, showing the importance of synergistic interactions among the components of multi-layered assemblages in optimizing light use. Nutrient enrichment had a less pervasive influence on the dominant fucoids H. banksii and C. torulosa than sedimentation. In laboratory experiments, nutrients stimulated the growth of H. banksii and C. torulosa germlings. However, negative impacts of high nutrient levels were observed for the early life stages of D. antarctica. The abundance of opportunistic, fast-growing algae rapidly increased in response to nutrient enrichment both in the laboratory and in the field. Impacts of ephemeral species on fucoid early life stages were only evident in laboratory contexts, where green algae of the genus Ulva impaired both the settlement of H. banksii zygotes and the growth of its germlings. Fucoid recruitment in the field was not affected by increased covers of ephemeral algae caused by enhanced nutrient regimes, indicating that H. banksii and C. torulosa may be resistant to short-term (one year) nutrient pollution. In the laboratory, increased temperatures within the range predicted for the end of the 21st century caused increased mortality in the H. banksii, C. torulosa and D. antarctica germlings. In a separate experiment, a combination of warmer water temperatures and nutrient enrichment enhanced the growth of ephemeral green algae. These results suggest that opposite responses to altered climate conditions may contribute to shifts from complex biogenic habitats dominated by macroalgal canopies to simplified systems monopolized by a limited number of stress-tolerant species. This research contributes to a clearer mechanistic understanding of biotic and physical mechanisms shaping the structure of coastal marine hard bottom communities under increasingly stressful conditions worldwide. These findings may provide insights for other studies investigating the complex mosaic of challenges facing marine coastal ecosystems.
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Ramos, Geraldo Jos? Peixoto. "Algas verdes coc?ides (Chlorophyta) de duas ?reas do Pantanal dos Marimbus (Baiano e Remanso), APA Marimbus-Iraquara, Chapada Diamantina, Bahia, Brasil." Universidade Estadual de Feira de Santana, 2013. http://localhost:8080/tede/handle/tede/260.

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Submitted by Natalie Mendes (nataliermendes@gmail.com) on 2015-11-12T23:29:45Z No. of bitstreams: 1 Ramos 2013 - Algas verdes cocoides (Chlorophyta) de duas ?reas do pantanal dos Marimbus (Baiano e.pdf: 8915844 bytes, checksum: 4608fb4b95cdad6269d11095980552c4 (MD5)
Made available in DSpace on 2015-11-12T23:29:45Z (GMT). No. of bitstreams: 1 Ramos 2013 - Algas verdes cocoides (Chlorophyta) de duas ?reas do pantanal dos Marimbus (Baiano e.pdf: 8915844 bytes, checksum: 4608fb4b95cdad6269d11095980552c4 (MD5) Previous issue date: 2013-03-14
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
This study aimed at surveying the coccoid green algae flora of two areas of the Pantanal dos Marimbus (Baiano and Remanso), EPA Marimbus Iraquara, located in the Chapada Diamantina, Bahia, Brazil. Material was obtained from 120 samples collected during the dry (April, June and August 2011) and in the rainy season (October and December 2011, and February 2012). During this study 121 taxa of coccoid green algae were identified, described, illustrated and commented, which are distributed in two classes, four orders and 46 genera, 109 species, three varieties typical and seven other does not typical of their respective species, and two taxonomic formae. 17 (14%) of the total of taxa identified are pioneer citations for Brazil, 51 taxa (42%) for the Northeast Region of Brazil, and 19 taxa (15,7%) for the Bahia State. Most taxa recorded were classified in the Sphaeropleales (76%), followed by Chlorellales (17%), Trebouxiales (3%) and Chlorococcales ?sensu stricto? (2%), while the taxa considered ?incertaesedis? were represented by 3% of the total taxa identified. Among the taxa studied in both areas, 14 were exclusive of the rainy period and only seven of the dry one, while 100 taxa were common to both climatic periods. The species richness was clearly higher in the Marimbus do Baiano with 115 taxa (95%), while the Marimbus do Remanso showed 99 taxa (82.5%). Of the 121 taxa studied, 22 were unique to the Marimbus do Baiano and six to the Marimbus do Remanso. According to the S?rensen similarity index (86.9%), the similarity between the Marimbus do Baiano and do Remanso was considered high. Most taxa inventoried (48%) was classified as rare on Pantanal Marimbus, followed by infrequent (42%), frequent (7%) and very frequent (3%). Considering that about 90% of the taxa found are listed first for the Bahia State, we strongly suggest continuing studies of biodiversity of inland water algae to increase knowledge of phycoflora in Bahia State and Brazil.
O presente estudo ? o levantamento flor?stico das algas verdes coc?ides ocorrentes em duas ?reas do Pantanal dos Marimbus (Baiano e Remanso), APA Marimbus Iraquara, localizada na Chapada Diamantina, Bahia, Brasil. Os materiais estudados provieram de 120 amostras coletadas no per?odo seco (abril, junho e agosto de 2011) e no chuvoso (outubro e dezembro de 2011 e fevereiro de 2012). Foram identificados, descritos, ilustrados e comentados 121 t?xons de algas verdes coc?ides, distribu?dos em duas classes, quatro ordens e 46 g?neros, 109 esp?cies, tr?s variedades t?picas e sete n?o t?picas de suas respectivas esp?cies e duas formas taxon?micas. Do total de t?xons inventariados, 17 t?xons (14%) s?o cita??es pioneiras para o Brasil, 51 t?xons (42%) para a Regi?o Nordeste do Brasil e 19 t?xons (15,7%) para o Estado da Bahia. A maior riqueza de t?xons foi registrada para a ordem Sphaeropleales (76%), seguida de Chlorellales (17%), Trebouxiales (3%) e Chlorococcales ?sensu strictu? (2%), enquanto que os t?xons considerados ?incertae sedis? foram representados por 3% do total. Dentre os t?xons estudados nas duas ?reas, 14 foram exclusivos do per?odo de chuva e apenas sete do per?odo de seca, enquanto que 100 t?xons foram comuns a ambos os per?odos clim?ticos. A riqueza espec?fica foi claramente maior no Marimbus do Baiano, com 115 t?xons (95%), enquanto que o Marimbus do Remanso apresentou 99 t?xons (82,5%). Dos 121 t?xons inventariados, 22 t?xons foram exclusivos do Marimbus do Baiano e seis do Marimbus do Remanso. De acordo com o ?ndice de Similaridade de S?rensen (86,9%), a similaridade entre os Marimbus do Baiano e do Remanso foi elevada. A maior parte dos t?xons inventariados (48%) foi classificada como de ocorr?ncia rara no Pantanal dos Marimbus, seguido de pouco frequente (42%), frequente (7%) e muito frequente (3%). Considerando que cerca de 90% dos t?xons encontrados s?o referidos pela primeira vez para o Estado da Bahia, sugere-se a continuidade dos estudos de biodiversidade de algas de ?guas continentais para ampliar o conhecimento da ficofl?rula na Bahia e no Brasil.
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9

Moulin, Solène. "Synthesis of hydrocarbons in algae : from biodiversity to biotechnology." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0429.

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Les hydrocarbures (HCs) sont prédominants dans notre économie actuelle (carburants, cosmétiques, chimie, etc.) mais sont quasi-exclusivement issus des ressources fossiles. Les problématiques de changement climatique et d’épuisement des ressources poussent les recherches vers l’étude et la domestication des voies de synthèse naturelles d’HCs. Lorsque j’ai commencé ma thèse, une enzyme de biosynthèse d’HC, l’acide gras photodécarboxylase (FAP) venait d’être découverte chez la microalgue Chlorella. J’ai d’abord caractérisé son homologue chez la microalgue modèle Chlamydomonas. Une étude phylogénétique de la famille des GMC oxidoréductases à laquelle appartient la FAP a permis d’identifier un large réservoir de de 200 FAPs putatives. La caractérisation biochimique de plusieurs d’entre elles a permis de montrer qu’une FAP fonctionnelle a été conservée lors des endosymbioses secondaires. Cela suggère que la FAP joue un rôle important chez les algues. Ce rôle a été étudié par une approche de génétique inverse chez Chlamydomonas. La caractérisation physiologique de mutants knockout a permis de démontrer le rôle de la FAP dans la synthèse d’HCs dans le chloroplaste et de mettre en évidence des modifications physiologiques transitoires. Des mécanismes de compensation à l’absence d’HCs restent donc à découvrir. Dans une dernière partie, j’ai développé une souche d’E. coli exprimant la FAP et une thioestérase. Cette souche produit en continu des HCs dans la phase gaz des cultures, ce qui permet une récolte facilitée du produit d’intérêt sous forme pure. Cette étude constitue une preuve de concept que la FAP pourrait être utilisée pour la production biosourcée d’HCs
Hydrocarbons (HCs) are predominant in our current economy (fuels, cosmetics, chemicals, etc.) but are almost exclusively derived from fossil resources. Climate change and resource depletion concerns are pushing research towards the study and domestication of natural HC synthesis pathways. When I started my thesis, a HC forming enzyme, the fatty acid photodecarboxylase (FAP) had just been discovered in the microalgae Chlorella. I first characterised its homolog in the model microalgae Chlamydomonas. A phylogenetic study of the GMC oxidoreductase family to which the FAP belongs has allowed identification of a large reservoir of 200 putative FAPs. Biochemical characterisation of several of them showed that a functional FAP was maintained during secondary endosymbiosis. This suggests that FAP plays an important role in algae. This role has been studied by a reverse genetic approach in Chlamydomonas. The physiological characterisation of knockout mutants demonstrated the role of FAP in the synthesis of HCs in chloroplasts as well as transient physiological changes. Mechanisms to compensate for the absence of HCs therefore remain to be discovered. In a last part, I developed a strain of E. coli expressing the FAP and a thioesterase. This strain continuously produces HCs in the gas phase of the cultures, which allows an easier harvesting of the product of interest in a pure form. This study is a proof of concept that FAP could be used for the biobased production of HCs
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Mystikou, Alexandra. "Seaweed biodiversity around the Antarctic Convergence in the South Atlantic." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=227597.

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This study focuses on the seaweed biodiversity around the Antarctic Convergence in the South Atlantic. It integrates field work in the Falkland Islands and surrounding regions with algal culturing, molecular techniques, microscopy and morphological identification. Chapter 2 explores the diversity of seaweeds of the south-western Antarctic Peninsula which is poorly studied, contrasting with the substantial knowledge available for the northern parts of the Peninsula. A baseline seaweed species checklist for the southern Adelaide Island and northern Marguerite Bay region is presented here, combining data obtained during a small number of surveys in 1973-5 and a six week intensive diving-based field campaign in 2010-2011. Subantarctic and Antarctic regions remain little studied in their seaweed diversity. Chapter 3 is based upon field collections in the early 1970s and 2007-2013. It is supported by sequencing COI and reports new records of several macroalgal species and an oomycete. Chapter 4 revisits the enigmatic Subantarctic brown alga Cladochroa chnoosporiformis, which had been collected only on one occasion by Carl Skottsberg in 1907 from Port Philomel, West Falkland, resulting in its formal taxonomic description. Within the framework of this study, Cladochroa was rediscovered after 106 years at its type locality, confirming its existence and morphological features as described by Skottsberg. The recollection enabled molecular studies of its phylogenetic placement by DNA sequencing, suggesting that C. chnoosporiformis is conspecific with Utriculidium durvillei. In Chapter 5, DNA barcoding was applied to both seaweed tissue samples taken while preparing herbarium specimens during 2 expeditions to the Falkland Islands, and to live macroalgal isolates obtained from substratum samples using the Germling Emergence Method. In several cases, this enabled detection of previously unsequenced or undescribed taxa, respectively. The potential and challenges of applying DNA barcoding for cataloguing the biodiversity of remote bioregions such as the Falklands are discussed.
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Книги з теми "ALGAL BIODIVERSITY"

1

1943-, Ben-Amotz Ami, Polle Jürgen E. W, and Subba Rao D. V, eds. The alga Dunaliella: Biodiversity, physiology, genomics and biotechnology. Enfield, N.H: Science Publishers, 2008.

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2

Rao, R. Raghavendra. Biodiversity in India, floristic aspects. Dehra Dun, India: Bishen Singh Mahendra Pal Singh, 1994.

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3

Robin, Rigby P., Iken Katrin, and Shirayama Yoshihisa, eds. Sampling biodiversity in coastal communities: NaGISA protocols for seagrass and macroalgal habitats. Kyoto, Japan: Kyoto University Press in association with NUS Press, 2007.

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4

Donors Consultative Meeting on the Regional Project Sustainable Development from Africa's Biodiversity (2004 Windhoek, Namibia). Proceedings of the Donor's Consultative Meeting on the Regional Project Sustainable Development from Africa's Biodiversity: Windhoek, Namibia, April 14-15, 2004. Windhoek, Namibia: ZERI Regional Project, University of Namibia, 2004.

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5

Jha, Bhavanath. Seaweeds of India: The Diversity and Distribution of Seaweeds of the Gujarat Coast. Dordrecht: Springer Netherlands, 2009.

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6

Mūnsin, Parinyā. Khwāmlāklāi thāng phanthukam khō̜ng sārāi læ khunnaphāp nām nai Mǣnam Khōng nai Čhangwat ʻUbon Rātchathānī: Rāingān kānwičhai = Algae genetic biodiversity and water quality in Mekhong River in Ubon Ratchathani Province. [Ubon Ratchathani]: Sakhā Wichā Chīwawitthayā, Khana Witthayāsāt, Mahāwitthayālai Rātchaphat ʻUbon Rātchathānī, 2007.

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7

Elumalai, Sanniyasi, Jeyabalan Sangeetha, Devarajan Thangadurai, and Shivasharana Chandrabanda Thimmappa. Phycobiotechnology: Biodiversity and Biotechnology of Algae and Algal Products for Food, Feed, and Fuel. Apple Academic Press, Incorporated, 2022.

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8

Sangeetha, Jeyabalan, Devarajan Thangadurai, Saniyasi Elumalai, and Shivasharana Chandrabanda Thimmappa. Phycobiotechnology: Biodiversity and Biotechnology of Algae and Algal Products for Food, Feed, and Fuel. Apple Academic Press, Incorporated, 2021.

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9

Sangeetha, Jeyabalan, Devarajan Thangadurai, Saniyasi Elumalai, and Shivasharana Chandrabanda Thimmappa. Phycobiotechnology: Biodiversity and Biotechnology of Algae and Algal Products for Food, Feed, and Fuel. Apple Academic Press, Incorporated, 2021.

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10

Newton, Paul. Seaweeds: Biodiversity, Environmental Chemistry and Ecological Impacts. Nova Science Publishers, Incorporated, 2017.

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Частини книг з теми "ALGAL BIODIVERSITY"

1

Kaloo, Zahoor Ahmad, and Samar Amin. "Algal Diversity in Jammu and Kashmir State." In Topics in Biodiversity and Conservation, 285–317. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-32-9174-4_13.

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2

Lampert, Winfried, and Jonathan Grey. "Exploitation of a deep-water algal maximum by Daphnia: a stable-isotope tracer study." In Aquatic Biodiversity, 95–101. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1084-9_6.

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3

Chatziefthimiou, Aspassia D., Sandra A. Banack, and James S. Metcalf. "Harmful Algal and Cyanobacterial Harmful Algal Blooms in the Arabian Seas: Current Status, Implications, and Future Directions." In The Arabian Seas: Biodiversity, Environmental Challenges and Conservation Measures, 1083–101. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51506-5_47.

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4

Rothschild, Lynn J. "Algal Physiology at High Temperature, Low pH, and Variable pCO2 Implications for Evolution and Ecology." In Thermophiles Biodiversity, Ecology, and Evolution, 125–42. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1197-7_10.

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5

Mann, D. G., and S. J. M. Droop. "Biodiversity, biogeography and conservation of diatoms." In Biogeography of Freshwater Algae, 19–32. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-017-0908-8_2.

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6

Bernecker, Andrea. "Marine Benthic Algae." In Marine Biodiversity of Costa Rica, Central America, 109–17. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8278-8_5.

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7

Abbas, Heba S. "Biodiversity and Distribution of Algae in Egypt." In Environmental Pollution, Biodiversity, and Sustainable Development, 229–56. Includes bibliographical references and index.: Apple Academic Press, 2020. http://dx.doi.org/10.1201/9780429265013-14.

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8

Bulleri, Fabio, Marco Abbiati, and Laura Airoldi. "The colonisation of human-made structures by the invasive alga Codium fragile ssp. tomentosoides in the north Adriatic Sea (Ne Mediterranean)." In Marine Biodiversity, 263–69. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4697-9_22.

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9

Arroyo, Nina, and Erik Bonsdorff. "The Role of Drifting Algae for Marine Biodiversity." In Marine Macrophytes as Foundation Species, 100–123. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.4324/9781315370781-6.

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10

Rees, Paul A. "Protoctists, monerans, fungi, lichens and acellular organisms." In Key questions in biodiversity: a study and revision guide, 33–49. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789248630.0003.

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Abstract This chapter contains questions about the classification and characteristics of a wide range of organisms including prokaryotes, protozoa, algae, slime molds, fungi, lichens and disease-causing microbes such as viruses and prions. The questions are divided into three levels: foundation, intermediate and advanced.
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Тези доповідей конференцій з теми "ALGAL BIODIVERSITY"

1

Grabowska, Magdalena. "The Role of Springs in Maintaining the Biodiversity of Freshwater Algae." In 1st International Electronic Conference on Biological Diversity, Ecology and Evolution. Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/bdee2021-09510.

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Neustroeva, Nadezhda, Victor Mukhin, Irina Novakovskaya, and Elena Patova. "Biodiversity of symbiotic algae of wood decay Basidimycetes in the Central Urals." In BDI 2020 – “Information technology in biodiversity research”. III National Scientific Conference with international participation dedicated to the 100th anniversary of Academician Pavel Gorchakovskii. Pensoft Publishers, 2020. http://dx.doi.org/10.3897/ap.2.e57555.

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Kuncoro, Eko Prasetyo, Thin Soedarti, Trisnadi Widyaleksono Catur Putrato, and Nurul Alvia Istiqomah. "Adsorption of cadmium from aqueous solution using algae waste based adsorbent." In PROCEEDING OF INTERNATIONAL BIOLOGY CONFERENCE 2016: Biodiversity and Biotechnology for Human Welfare. Author(s), 2017. http://dx.doi.org/10.1063/1.4985411.

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4

Elobaid, Elnaim, Bruno Welter Giraldes, Hamad Al-Kuwari, Jassim Al-Khayat, Fadhil Sadooni, and Ekhlas Elbary. "Towards Sustainable Management of Coastal and Offshore Islands in Arabian Gulf Typology: Sensitivity Analysis, Ecological Risk Assessment of Halul and Al-Alyia Islands." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0035.

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The great majority of marine ecosystems in Qatar are in fast decline and nearing collapse, where most ecosystem has lost the biological and economic functionality. Aiming to support the decision makers in the management and restoration strategies for recovering the biological and economic functionality of the ecosystems/natural resources of Qatar, we conducted 1) a typology mapping of the main components of the ecosystem of two islands, 2) a sensitivity and vulnerability assessment according to the known guidelines and standards. Highlighting the potential ecological risk and required recommendations for sustainable management plans, within the frame of Qatar National Vision 2030 (QNV 2030). The Islands present different anthropogenic pressure. As expected, Al Alyia the coastal Island is under real risk, with critical areas of sensibility but still presenting a potential for recovering its economy and ecological functionality, highlighting the collapsed stage of the very sensitive coral reefs, the vulnerability of oyster beds and seagrass and the functionality of the mangrove (expanding) and Sabha with massive birds nesting. The offshore Island Halul presented in the typology mapping the coral reefs as the main ecosystem but with the presence of seagrass, algae bed, sandy beach, and Sabha. The coral reef still presents a certain functionality, with corals covering several hard substrates, however with high sensitivity and high vulnerability, especially the coral in the shallow areas with scattered colonies, and the vulnerable nesting of marine turtles on beaches. As the management, we recommend increasing the restoration effort of targeted ecosystems, mainly involving coral reefs for increasing the marine biodiversity in general and restoring the oyster beds for recovering the filtration service. Strategies must be made for recovering the ecosystems’ functionality and restore the productivity of the Qatari fishing stock. We recommend applying this mapping method and sensitivity classification for all marine areas around Qatar for supporting the management plans.
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