Gotowe bibliografie tematyczne / Dugongs

Gotowa bibliografia na temat „Dugongs”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Dugongs"

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Cleguer, C., C. Garrigue i H. Marsh. "Dugong (Dugong dugon) movements and habitat use in a coral reef lagoonal ecosystem". Endangered Species Research 43 (24.09.2020): 167–81. http://dx.doi.org/10.3354/esr01061.

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Little is known about how the Vulnerable dugong Dugong dugon uses coral reef lagoons despite the importance of these habitats throughout much of its vast range. We used GPS satellite tracking systems to explore the space use of 12 dugongs at 3 locations in the coral reef lagoons of the main island of New Caledonia in the southwest Pacific: Cap Goulvain, Ouano and Nouméa. The movements of the tracked dugongs varied among individuals and all except one animal undertook large-scale movements (>15 km; mean [±SE] 37.7 ± 5.2 km) from their capture location (maximum waterway distance range: 13.8 to 72.9 km). The straight-line distances between the furthest GPS locations during each animal’s tracking period ranged from 21.3 to 74.5 km. We identified areas used intensively by dugongs in all 3 study areas, some of which were areas where seagrass presence has not been verified, or where dugongs have not been observed during past aerial surveys. Dugongs spent most of their tracking time within the lagoons, with 99.4% of GPS locations found inside the barrier reef. Nonetheless, where the lagoon was narrow and confined, 3 tracked dugongs used the fore reef shelf outside the barrier reef in the open ocean to commute between bays. Our findings can inform conservation and management initiatives in New Caledonia as well as other countries within the dugong’s range which have similar habitat geomorphology but where dugongs occur in numbers too low to be tracked and are considered Critically Endangered.
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Awadh, Asma, Maarifa Mwakumanya i Mohamed Omar. "Dugongs' (Dugon Dugong) traditional values in Kenya; and their influence on their conservation." American Journal of Environment Studies 4, nr 2 (5.08.2021): 1–13. http://dx.doi.org/10.47672/ajes.759.

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Purpose: This study aimed to assess Dugongs' status distribution of dugongs (Dugong dugon) in Kenya. A dugong is a herbivorous marine mammal of the tropical and subtropical Indo-West Pacific and the Indian Ocean. Dugongs are one of four existing species of the order Sirenia, which is considered most at risk of extinction. Globally, IUCN classified the Dugong as rare; Kenya has done the same under the Wildlife Conservation and Management Act 2013, thus making Dugongs a conservation priority. This paper discusses the traditional practices of dugongs and how this influenced their population and conservation. Methodology: The study used a literature review, semi-structured questionnaires, guided interviews, and focus group discussions with respondents on obtaining data. Findings: More than 100 dugongs occurred in the Kenyan waters in the 1960s; their population has declined drastically since then. Dugongs were a sought-after delicacy on the Kenyan coast. Dugong meat was consumed for its taste and nutritional use. In the northern study areas, its oil was separated and used for cosmetic and medicinal purposes. Unique contribution to theory, practice and policy: This study confirms fishing practices and traditional consumption practices on dugongs were seen to have led to their detriment. The study recommends rich continuous education and awareness efforts to change the thinking and practices of the people towards conservation of dugongs and the environment in general.
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Awadh , Asma, Maarifa Mwakumanya i Mohamed Omar. "Dugongs in Kenya – a survey on status and Trends". American Journal of Environment Studies 4, nr 1 (5.08.2021): 76–87. http://dx.doi.org/10.47672/ajes.758.

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Purpose: The purpose of this study was to assess Dugongs' status distribution of dugongs (Dugong dugon) in Kenya. A dugong is a herbivorous marine mammal of the tropical and subtropical Indo-West Pacific and the Indian Ocean. Globally, IUCN classified the Dugong as rare; Kenya has done the same under the Wildlife Conservation and Management Act 2013, thus making Dugongs a conservation priority. The study's main objective was to assess dugongs' distribution and status for conservation in Kenya since the 1960s. Methodology: The study employed a concurrent triangulation design to corroborate findings from three methods. The study used a literature review, semi-structured questionnaires, guided interviews, and focus group discussions with respondents on obtaining socio-economic data. Data was collected in fishing villages with documented and or anecdotal records of the availability of dugongs. Experiences 378 fishers were reached for the study. The study aggregated the number of dugongs sited by decades from the six sampled study sites and presented the data on a line graph. Further, the study computed the rate of change in dugongs from one decade to the next. Findings: More than 100 dugongs occurred in the Kenyan waters in the 1960s; their population has declined considerably since then. The dugong habitat and feeding area have also shrunk over the same period, further aggravating the situation. There were more than thirty known dugong feeding areas in the study areas; only 10 of them are still known to host dugongs. An estimated 20 dugongs are known to be present in the Kenyan marine waters in the current times. Unique contribution to theory, practice and policy: This study confirmed the presence of dugongs in Kenya. Further, the dugong numbers are very small, thus showing an urgent need for their conservation. Dugongs are found in Kiunga and Kisite Marine Protected Areas (MPAs) and their immediate surroundings; this amplifies the conservation value of the MPAs.
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SYAFUTRA, RANDI, WAHYU ADI, MUHAMMAD IQBAL i INDRA YUSTIAN. "Short Communication: Dugong dugon Müller, 1776 (Sirenia, Dugongidae) in Bangka Island, Indonesia". Biodiversitas Journal of Biological Diversity 19, nr 3 (1.05.2018): 823–30. http://dx.doi.org/10.13057/biodiv/d190310.

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Syafutra R, Adi W, Iqbal M, Yustian I. 2018. Short communication: Dugong dugon Müller, 1776 (Sirenia, Dugongidae) in Bangka Island, Indonesia. Biodiversitas 19: 823-830. Dugong dugon is a marine mammal species classified as Vulnerable. It has distribution in Indonesia, especially in Bangka Island. However, only four records of dugong were reported in Bangka Island in 1976, 2006, and 2007. In addition, there is little published information about local beliefs toward dugong and awareness actions toward dugong conservation in Bangka Island. This research compiled new records of dugong, local beliefs toward dugong, and awareness actions toward dugong conservation in Bangka Island. Sixteen new records of dugong were collected in Bangka Island leading to a total of 18 records for this island. All new records of dugong were obtained entirely from the eastern waters of Bangka Island. The new records also informed that most of the dugongs were found dead and entangled in gill nets. In addition, an interesting local belief caused Kurau Village becomes the most important location for fishermen to sell dead dugongs or dugongs’ meat. Furthermore, three main awareness actions toward dugong had been implemented in Bangka Island in 2017.
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Panyawai, Janmanee, i Anchana Prathep. "A Systematic Review of the Status, Knowledge, and Research Gaps of Dugong in Southeast Asia". Aquatic Mammals 48, nr 3 (15.05.2022): 203–22. http://dx.doi.org/10.1578/am.48.3.2022.203.

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The dugong (Dugong dugon; Müller, 1776) is a vulnerable marine mammal species. This systematic review aims to provide information about the remaining populations, distributions, and habitat sites of the dugong in Southeast Asia. By combining this information with scientific research, critical knowledge gaps about dugongs in this region can be filled. This review showed that dugong populations have not only been reduced but also scattered in coastal waters. Little information is available about the remaining population numbers and distributions of dugongs. The largest estimated populations were reported around East Malaysia (688 to 1,376 dugongs); North Sulawesi, Indonesia (1,000 dugongs); and in the Andaman Sea, Thailand (200 to 250 dugongs). Published research has been very limited—approximately two articles per year. From 1993 until 2021, articles about the dugong were published in the context of ecology, conservation, biology, socioecology, biochemistry, and physiology. Visual and aerial surveying and anecdotal information about sightings and strandings of dugongs were the typical methods of research in Southeast Asia. The conservation strategy in this region is still focused on specific subject areas. The knowledge base for the species is lacking detailed quantitative data on remaining dugong populations, movements, habitats, and mating periods. Behavioral information lacks data for both spatial and temporal variations in foraging behavior, for example. Elucidation is needed in several different aspects of seagrass ecosystem dynamics. Improvements in captive dugong husbandry are also needed to ensure the sustainable conservation of the dugong in the region. National and international management decisions must be based on solid scientific data and multisector integration.
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Lanyon, JM, i H. Marsh. "Digesta Passage Times in the Dugong". Australian Journal of Zoology 43, nr 2 (1995): 119. http://dx.doi.org/10.1071/zo9950119.

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The retention times of particulate digesta were measured in two captive dugongs, Dugong dugon (Muller 1776) using inert plastic markers. The mouth-to-anus retention times (146-166 h) were similar to those of the West Indian manatee, and much longer than those of most other herbivorous mammals. This slow gut passage rate may be explained by the dugong's long digestive tract, the low fibre level of the diet and the low food intake. Like the manatee, the dugong appears to have a digestive strategy that is atypical of hindgut fermenters: low-fibre material is retained for extended periods within the long hindgut and almost completely digested.
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Tol, Samantha J., Rob G. Coles i Bradley C. Congdon. "Dugong dugonfeeding in tropical Australian seagrass meadows: implications for conservation planning". PeerJ 4 (7.07.2016): e2194. http://dx.doi.org/10.7717/peerj.2194.

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Dugongs (Dugong dugon) are listed as vulnerable to extinction due to rapid population reductions caused in part by loss of seagrass feeding meadows. Understanding dugong feeding behaviour in tropical Australia, where the majority of dugongs live, will assist conservation strategies. We examined whether feeding patterns in intertidal seagrass meadows in tropical north-eastern Australia were related to seagrass biomass, species composition and/or nitrogen content. The total biomass of each seagrass species removed by feeding dugongs was measured and compared to its relative availability. Nitrogen concentrations were also determined for each seagrass species present at the sites. Dugongs consumed seagrass species in proportion to their availability, with biomass being the primary determining factor. Species composition and/or nitrogen content influenced consumption to a lesser degree. Conservation plans focused on protecting high biomass intertidal seagrass meadows are likely to be most effective at ensuring the survival of dugong in tropical north-eastern Australia.
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Poommouang, Anocha, Promporn Piboon, Kittisak Buddhachat, Janine L. Brown, Wannapimol Kriangwanich, Siriwadee Chomdej, Jatupol Kampuansai i in. "Microsatellite Polymorphism and the Population Structure of Dugongs (Dugong dugon) in Thailand". Animals 12, nr 3 (19.01.2022): 235. http://dx.doi.org/10.3390/ani12030235.

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The dugong (Dugong dugon) is an endangered species of marine mammals, so knowledge of genetic diversity of these populations is important for conservation planning within different habitats. In this study, six microsatellite markers were used to assess the genetic diversity and population structure of 77 dugongs from skin samples of stranded animals collected from 1994–2019 (69 from Andaman Sea and 8 from the Gulf of Thailand). Our results found that dugongs in the Andaman Sea had higher genetic variation than those in the Gulf of Thailand. Populations in Trang, Satun, and some areas of Krabi had highest diversity compared to other regions of Thailand. Bayesian genetic clustering analysis revealed that dugongs in Thailand consist of five genetic groups. Moreover, dugongs in the middle and lower Andaman Sea presented the greatest gene flow compared to other regions. However, based on calculation of inbreeding coefficients (Fis value = 0.239), dugong populations in the Sea of Thailand are experiencing some levels of inbreeding, and so may warrant special protections. These results provide important information for understanding the genetic status of dugongs that can lead to improved management and conservation of this endangered species.
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Louise Chilvers, B., Steven Delean, Nicholas J. Gales, Dave K. Holley, Ivan R. Lawler, Helene Marsh i Anthony R. Preen. "Diving behaviour of dugongs, Dugong dugon". Journal of Experimental Marine Biology and Ecology 304, nr 2 (czerwiec 2004): 203–24. http://dx.doi.org/10.1016/j.jembe.2003.12.010.

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KWAN, DONNA, HELENE MARSH i STEVEN DELEAN. "Factors influencing the sustainability of customary dugong hunting by a remote indigenous community". Environmental Conservation 33, nr 2 (czerwiec 2006): 164–71. http://dx.doi.org/10.1017/s0376892906002992.

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The sustainability of indigenous customary hunting and fishing in remote areas can be influenced by human factors operating at global as well as regional and local scales because of the hybrid nature and sectoral interactions of the local economic environment. The internationally significant population of dugongs (Dugong dugon or seacow) in Torres Strait between Australia and Papua New Guinea supports an important indigenous fishery. The economic, socio-cultural and environmental factors that influenced hunting activity in 1998 and 1999 by the members of the community of Mabuiag Island were investigated to inform the sustainable management of the fishery. The landed catch during the eight months March to October of 145 dugongs in 1998 and 170 dugongs in 1999 potentially provided the community with an average of 290 g of dugong meat per person per day. Fifty-seven per cent of adult males on the island participated in dugong hunting, but more than half the catch in each year was caught by only two hunters. The probability of at least one person from the community going dugong hunting in 1998 and 1999 was 0.59 ± 0.02 per day. This probability was influenced by local environmental factors, including the abundance of dugongs in the traditional hunting grounds (affected by wind speed, year, season and lunar day) and the size of the commercial crayfish catch (which is influenced by the global market price, as well as local conditions). Although dugong hunting remains a very important part of the islanders’ contemporary culture and customary economy, the capacity to hunt dugongs is facilitated by the ease with which some hunters move between the state, commercial and customary sectors of their local economy. The complexities of the economic, social and cultural environments need to be considered in planning for the sustainable harvesting of threatened species by remote indigenous communities.
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Rozprawy doktorskie na temat "Dugongs"

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Haynes, David. "Pesticide and heavy metal concentrations in Great Barrier Reef sediment, seagrass and dugongs (Dugong dugon) /". [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16183.pdf.

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Holley, David K. "Movement patterns and habitat usage of Shark Bay dugongs". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2006. https://ro.ecu.edu.au/theses/70.

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In order to define small and large scale spatial and temporal individual movement patterns of dugongs (Dugong dugon) within the Shark Bay World Heritage Property (SBWHP) a total of 19 dugongs were fitted with remote location recording and transmitting devices. Combined locations from all units totalled over 10,000 locations. This spatial and temporal data was used to define movement patterns of dugongs within Shark Bay as well as areas of high use deemed to be indicative of foraging activity. Platform Transmitting Terminals (PTT?s) using the ARGOS location collection system tracked animals over large temporal scales with 4 animals tracked up to periods of 11 months. Using these instruments it was possible accurately define a previously identified large-scale seasonal movement pattern within the confines of Shark Bay. These four animals showed distinct seasonal home ranges defined by changes in Sea Surface Temperature.
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Holley, David K. "Movement patterns and habitat usage of Shark Bay dugongs". Connect to thesis, 2006. http://portal.ecu.edu.au/adt-public/adt-ECU2007.0016.html.

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Takahashi, Eri. "Risk Assessment of Marine Algal Toxins on Humans and Dugongs". Thesis, Griffith University, 2007. http://hdl.handle.net/10072/367296.

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Algal toxins can have a significant impact on human and ecological health as the toxins accumulate in the food chain and are consumed by both humans and marine organisms. This study focussed on the following marine algal toxins that were present at the study sites: okadaic acid (OA), domoic acid (DA), gymnodimine (GD), pectenotoxin-e (PTX-2) and PTX-2 seco acid (PTX-2SA). The study sites investigated for potential algal toxin exposure were selected from the waters around North Stradbroke Island, Queensland, Australia, where shellfish are harvested by the local population, and where dugongs are known to feed on seagrass. Samples were collected monthly for two consecutive years. The species of toxinproducing algae present at the sites studied were Pseudo-nizschia sp., Dinophysis caudata, D. acuminata and Prorocentrum lima. The occurrence of Dinophysis species was observed to be dependent on the season while Pseudo-nitzschia sp was present both in colder and warmer months. Data on the dose-response analysis were extracted from published literature. This data was categorised into whole organisms, human and animal cell lines, and compared to one another. For further toxicodynamic studies, human cell lines were dosed with known concentrations of the toxins: OA, DA and GD. These cytotoxicity and microarray analyses were performed to observe the effects of toxins on gene regulation. A more extensive analysis was performed using GD alone. Expression of numerous genes was affected, and real time polymerase chain reaction reactions were performed to confirm the regulation of those genes. Gymnodimine was demonstrated to affect genes within pathways relating to oxidative phosphorylation, apoptosis, MAPK and Wnt signalling pathways. The cytotoxicity and microarray data and the data accumulated from the published literature were combined to form a comprehensive database of both chronic and acute effects. The database was then referred to for the dose-response analysis for the risk assessment. The exposure data attained from field sampling in the current study was analysed against the doses for any shown effects. Total daily intake for humans and dugongs sourcing food from around the island were calculated and health risks were estimated by incorporating tolerable daily intake, guideline values and total daily intake. The risk characteristics of algal toxins on the health of humans (consuming shellfish) and dugongs (consuming seagrass) indicated that acute health risks were unlikely, unless an outbreak of toxic algae (algal bloom) were to occur. Since there were no occurrences of algal blooms during the study period, high levels of toxins were not detected in any of the collected shellfish, phytoplankton or seagrass samples. However, if such blooms were to occur around the island, the phytoplankton could potentially produce algal toxins at high enough concentrations to cause acute toxic effects in the consumers. The current study has also demonstrated that there is a potential for chronic, long term health effects from consuming shellfish and seagrass around the island. The presence of low-level concentrations of algal toxins in the food sources can lead to chronic effects. Toxins such as OA are known tumour promoters. For dugongs, which feed on seagrass on daily basis, the potential for chronic effects is high. It was demonstrated that GD also possesses toxicological characteristics that may enhance the possibility of tumour promotion because of its effect of down-regulating parts of the apoptosis pathway, which may prevent cell death and as a consequence, lead to uncontrolled cell growth.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Faculty of Science, Environment, Engineering and Technology
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Gerrard, Cedric Aron. "Dugong-watching tourism and encounter response of the dugong, Dugong dugon, in Shark Bay, Western Australia". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ49615.pdf.

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Ichikawa, Kotaro. "Studies on behavioral ecology and protection measures of the dugongs based on analyses of marine acoustical informations". 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/135985.

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Gaus, Caroline, i n/a. "Dioxins in the Marine Environment: Sources, Pathways and Fate of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Queensland, Australia". Griffith University. School of Public Health, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030624.144111.

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Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans(PCDFs) are two groups of lipophilic, persistent organic pollutants that are produced as by-products of various anthropogenic and industrial processes. Due to their relatively high toxic potencies and potential to bioaccumulate and biomagnify in organisms and through the food chain, the contemporary widespread distribution of these compounds is a concern to the health of the environment, wildlife and humans. This study determined the distribution, pathways and fate of PCDD/Fs in the coastal zone of Queensland, Australia, including the inshore marine environment of the World Heritage Great Barrier Reef Marine Park. This ecosystem supports unique fauna and flora such as the marine herbivorous mammal dugong (Dugong dugon) and its food source, seagrass. Elevated PCDD/Fs were present in soils and sediments along the entire Queensland coastline. Highest concentrations were found in soil from agricultural irrigation drains and in sediments near the mouths of major rivers. Elevated concentrations were associated with rural and urban types of land-use, and PCDD/Fs were present even in locations remote from anthropogenic activities. PCDD/F congener-specific analysis revealed an unusual profile in all samples, dominated by OCDD, with PCDFs present in low concentrations or below the limit of detection. Distinct HxCDD isomer patterns were observed, with the 1,2,3,7,8,9-HxCDD/1,2,3,4,6,7-HxCDD isomer pair dominating the 2,3,7,8-substituted HxCDDs. Similar congener and isomer characteristics were reported in sediments, soil and clay samples from other continents, but could not be attributed to any known source. Possible PCDD/F sources in Queensland were assessed using segmented estuarine sediment cores, for which radiochemical chronologies were established for each depth. Variations of PCDD/F concentrations in the sediment cores over several centuries of depositional history were relatively small. Elevated PCDD levels were still present in sediment slices from the early 17th century. PCDD/F homologue profiles in sediments deposited during the last 350 years were almost identical and correlated well to the characteristic profiles observed in surface sediments and soils from the entire Queensland coastline. These results suggested the presence of an unidentified PCDD source prior to the production of commercial organochlorine products. To investigate the formation of the unusual PCDD/F profiles, congener and isomer specific analyses were undertaken in soils, sediments and dated sediment cores. The results demonstrated that specific transformation processes in the environment have resulted in the observed PCDD profile characteristics. Dechlorination of OCDD was proposed to result in distinct 1,4-pattern characteristics (i.e. formation of isomers chlorinated in the 1,4,6,9-positions). Consequently, the environmental samples do not reflect the signatures of the original source. An alternative hypothesis to natural formation is discussed evaluating these processes and their implications for possible source contributions. This hypothesis explores the potential for the influence of anthropogenic PCDD precursors (e.g. pentachlorophenol) during the 1940s to 1990s. Transport of PCDD/Fs from the land-based source via impacted tributary river systems, and subsequent deposition processes are proposed to result in PCDD/F accumulation in the inshore marine ecosystem. The extent of the sediment PCDD/F contamination governs the concentrations in the extensive inshore marine seagrass meadows of Queensland. Partitioning processes in the sediment-seagrass system lead to increased toxic equivalency (TEQ) in the seagrass, compared to sediment.The relationship between contaminated inshore sediments, seagrass and dugongs were evaluated using six dugong habitat regions along the coastline. PCDD/F body burdens in dugongs are governed by sediment (and seagrass) PCDD/F concentrations in their habitat. High seagrass (and incidental sediment) ingestion rates, selective retention of toxicologically potent congeners and relatively low PCDD/F elimination capacities in dugongs are proposed to result in elevated PCDD/F concentrations and TEQ levels in adult animals. Transfer efficiencies of 4 and 27% of maternal TEQ levels to foetuses and calves (respectively) during gestation and lactation result in relatively high exposure potentials to offspring. Compared to no-observed-adverse-effect-levels in other mammals, and based on the results of this study, a tolerable daily intake (TDI) of 10-24 pg TEQ kg-1 day-1 was estimated for dugongs. The results of the present study found that dugongs from some regions along the coastline of Queensland exceed this TDI by up to 20 fold, suggesting that these populations may be at risk from PCDD/F contamination in their habitat. These results have important implications for the health of the environment, wildlife and humans and were used to develop a conceptual understanding of the sources, pathways and fate of dioxins in Queensland, Australia.
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Gaus, Caroline. "Dioxins in the Marine Environment: Sources, Pathways and Fate of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Queensland, Australia". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/367537.

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Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans(PCDFs) are two groups of lipophilic, persistent organic pollutants that are produced as by-products of various anthropogenic and industrial processes. Due to their relatively high toxic potencies and potential to bioaccumulate and biomagnify in organisms and through the food chain, the contemporary widespread distribution of these compounds is a concern to the health of the environment, wildlife and humans. This study determined the distribution, pathways and fate of PCDD/Fs in the coastal zone of Queensland, Australia, including the inshore marine environment of the World Heritage Great Barrier Reef Marine Park. This ecosystem supports unique fauna and flora such as the marine herbivorous mammal dugong (Dugong dugon) and its food source, seagrass. Elevated PCDD/Fs were present in soils and sediments along the entire Queensland coastline. Highest concentrations were found in soil from agricultural irrigation drains and in sediments near the mouths of major rivers. Elevated concentrations were associated with rural and urban types of land-use, and PCDD/Fs were present even in locations remote from anthropogenic activities. PCDD/F congener-specific analysis revealed an unusual profile in all samples, dominated by OCDD, with PCDFs present in low concentrations or below the limit of detection. Distinct HxCDD isomer patterns were observed, with the 1,2,3,7,8,9-HxCDD/1,2,3,4,6,7-HxCDD isomer pair dominating the 2,3,7,8-substituted HxCDDs. Similar congener and isomer characteristics were reported in sediments, soil and clay samples from other continents, but could not be attributed to any known source. Possible PCDD/F sources in Queensland were assessed using segmented estuarine sediment cores, for which radiochemical chronologies were established for each depth. Variations of PCDD/F concentrations in the sediment cores over several centuries of depositional history were relatively small. Elevated PCDD levels were still present in sediment slices from the early 17th century. PCDD/F homologue profiles in sediments deposited during the last 350 years were almost identical and correlated well to the characteristic profiles observed in surface sediments and soils from the entire Queensland coastline. These results suggested the presence of an unidentified PCDD source prior to the production of commercial organochlorine products. To investigate the formation of the unusual PCDD/F profiles, congener and isomer specific analyses were undertaken in soils, sediments and dated sediment cores. The results demonstrated that specific transformation processes in the environment have resulted in the observed PCDD profile characteristics. Dechlorination of OCDD was proposed to result in distinct 1,4-pattern characteristics (i.e. formation of isomers chlorinated in the 1,4,6,9-positions). Consequently, the environmental samples do not reflect the signatures of the original source. An alternative hypothesis to natural formation is discussed evaluating these processes and their implications for possible source contributions. This hypothesis explores the potential for the influence of anthropogenic PCDD precursors (e.g. pentachlorophenol) during the 1940s to 1990s. Transport of PCDD/Fs from the land-based source via impacted tributary river systems, and subsequent deposition processes are proposed to result in PCDD/F accumulation in the inshore marine ecosystem. The extent of the sediment PCDD/F contamination governs the concentrations in the extensive inshore marine seagrass meadows of Queensland. Partitioning processes in the sediment-seagrass system lead to increased toxic equivalency (TEQ) in the seagrass, compared to sediment.The relationship between contaminated inshore sediments, seagrass and dugongs were evaluated using six dugong habitat regions along the coastline. PCDD/F body burdens in dugongs are governed by sediment (and seagrass) PCDD/F concentrations in their habitat. High seagrass (and incidental sediment) ingestion rates, selective retention of toxicologically potent congeners and relatively low PCDD/F elimination capacities in dugongs are proposed to result in elevated PCDD/F concentrations and TEQ levels in adult animals. Transfer efficiencies of 4 and 27% of maternal TEQ levels to foetuses and calves (respectively) during gestation and lactation result in relatively high exposure potentials to offspring. Compared to no-observed-adverse-effect-levels in other mammals, and based on the results of this study, a tolerable daily intake (TDI) of 10-24 pg TEQ kg-1 day-1 was estimated for dugongs. The results of the present study found that dugongs from some regions along the coastline of Queensland exceed this TDI by up to 20 fold, suggesting that these populations may be at risk from PCDD/F contamination in their habitat. These results have important implications for the health of the environment, wildlife and humans and were used to develop a conceptual understanding of the sources, pathways and fate of dioxins in Queensland, Australia.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Public Health
Faculty of Health Sciences
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Churchward, Carol Anne. "The effect of depth and activity type on dugong (Dugong dugon) diving behaviour in Shark Bay, Western Australia". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ64946.pdf.

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Rahman, Ibrahim Haji Abdul. "The sea mammal Dugong dugon and its environment: Chemical analysis and speciation studies". Thesis, Rahman, Ibrahim Haji Abdul (1996) The sea mammal Dugong dugon and its environment: Chemical analysis and speciation studies. Masters by Research thesis, Murdoch University, 1996. https://researchrepository.murdoch.edu.au/id/eprint/51688/.

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Samples of sediment, seagrass and dugong tissues were analyzed for selected elements: Fe, Zn, Cu, Pb, Mn, Cd, Ni, Co, Al, P and S. Iron was the most interesting element found in relation to the samples analyzed. The level of iron in dugong liver tissue is extraordinarily high, ranging from 12 691- 71 123 µg g-1 dry weight. Ferritins from liver of dugong were isolated and characterized. Ferritin was purified by heat treatment and two-column gel filtration on Sephadex G-75 and Sephacryl S-300. Isolation of ferritin was monitored by determining iron to protein ratio. For reference, ferritin was also isolated from human liver and spleen. Purity of the isolated ferritin was determined by analytical electrophoresis. The amino acid composition and subunit nature of the purified ferritin are within the normal range reported for the well-characterized human liver and spleen ferritins and horse spleen ferritin. The core size of purified dugong ferritin was determined by electron microscopy, which also indicated that purified dugong ferritin had a limited crystallinity. Mossbauer spectra of purified ferritin at 78K indicated the presence of ferrihydrite (5Fe2O39H2O) rather than geothite-like (α-FeOOH) iron oxide. This latter iron oxide was detected in the whole liver tissue of dugong. Overall, the characteristics of purified dugong ferritin are similar to other mammalian ferritins. The elemental analysis of dugong tissue, seagrass and sediment in its environment indicated that the dugong studied live in areas of minimum anthropogenic activity. The naturally high level of iron in its environment and food is reflected in the high liver iron values. The ability of the liver tissue to withstand the high concentration of iron in the tissue without apparently damaging the tissue deserves further study.
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Książki na temat "Dugongs"

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Miller, Geoff. Dugongs. Danbury, Conn: Grolier Educational, 1999.

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Miller, Geoff. Dugongs. Danbury, Conn: Grolier, 2009.

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Miller, Geoff. Dugongs. Danbury, Conn: Grolier, 2009.

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Powell, James. Manatees & dugongs. Grantown-on-Spey: Colin Baxter Photography, 2002.

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K, Odell Daniel, red. Manatees and dugongs. New York: Facts on File, 1991.

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Australia. Department of Sustainability, Environment, Water, Population, and Communities. Dugongs: Respect and protect : dugong profile for range states in the Pacific Islands. Apia, Samoa: SPREP, Secretariat of the Pacific Regional Environment Programme, 2011.

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Matthews, Elizabeth. Local knowledge about dugongs in Palau. Koror, Palau: Palau Conservation Society, 2003.

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Ripple, Jeff. Manatees and dugongs of the world. Stillwater, MN: Voyageur Press, 1999.

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The call of the siren: Manatees and dugongs. Golden, Colo: Fulcrum Publishing, 1992.

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Bryden, M. M. Dugongs, whales, dolphins and seals: Sea mammals of Australasia. St Leonards, N.S.W: Allen & Unwin, 1998.

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Części książek na temat "Dugongs"

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Nolan, Elizabeth C., i Michael T. Walsh. "Sirenians (Manatees and Dugongs)". W Zoo Animal and Wildlife Immobilization and Anesthesia, 693–702. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118792919.ch50.

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Marsh, Helene, Alana Grech i Kathryn McMahon. "Dugongs: Seagrass Community Specialists". W Seagrasses of Australia, 629–61. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71354-0_19.

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Nasr, Dirar, Ahmed M. Shawky i Peter Vine. "Status of Red Sea Dugongs". W Springer Oceanography, 327–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99417-8_18.

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Rosas, Fernando César Weber, i Tatiana Lucena Pimentel. "Order Sirenia (Manatees, Dugongs, Sea Cows)". W Biology, Medicine, and Surgery of South American Wild Animals, 352–62. Ames, Iowa, USA: Iowa State University Press, 2008. http://dx.doi.org/10.1002/9780470376980.ch31.

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Bonde, Robert K., i Mark Flint. "Human Interactions with Sirenians (Manatees and Dugongs)". W Marine Mammal Welfare, 299–314. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-46994-2_17.

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Kuppusamy, Sivakumar. "Conservation Perspectives of Dugongs and Sea Turtles in Andaman and Nicobar Islands". W Faunal Ecology and Conservation of the Great Nicobar Biosphere Reserve, 357–73. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5158-9_17.

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Marsh, Helene, Camille Albouy, Eduardo Arraut, Delma Nataly Castelblanco-Martínez, Catherine Collier, Holly Edwards, Cassandra James i Lucy Keith–Diagne. "How Might Climate Change Affect the Ethology and Behavioral Ecology of Dugongs and Manatees?" W Ethology and Behavioral Ecology of Marine Mammals, 351–406. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90742-6_8.

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Deutsch, Charles J., Delma Nataly Castelblanco-Martínez, Christophe Cleguer i Rachel Groom. "Movement Behavior of Manatees and Dugongs: II. Small-Scale Movements Reflect Adaptations to Dynamic Aquatic Environments". W Ethology and Behavioral Ecology of Marine Mammals, 233–98. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90742-6_6.

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Deutsch, Charles J., Delma Nataly Castelblanco-Martínez, Rachel Groom i Christophe Cleguer. "Movement Behavior of Manatees and Dugongs: I. Environmental Challenges Drive Diversity in Migratory Patterns and Other Large-Scale Movements". W Ethology and Behavioral Ecology of Marine Mammals, 155–231. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90742-6_5.

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Sivakumar, K. "Status and Conservation of Dugong dugon in India: Strategies for Species Recovery". W Ecology and Conservation of Tropical Marine Faunal Communities, 419–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38200-0_27.

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Streszczenia konferencji na temat "Dugongs"

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Maire, Frederic, Luis Mejias, Amanda Hodgson i Gwenael Duclos. "Detection of dugongs from unmanned aerial vehicles". W 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2013). IEEE, 2013. http://dx.doi.org/10.1109/iros.2013.6696745.

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Okumura, Naoko, Kotaro Ichikawa, Tomonari Akamatsu, Nobuaki Arai, Tomio Shinke, Takeshi Hara i Kanjana Adulyanukosol. "Stability of Call Sequence in Dugongs' Vocalization". W OCEANS 2006 - Asia Pacific. IEEE, 2006. http://dx.doi.org/10.1109/oceansap.2006.4393936.

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Warren, Christopher, Jennifer Dupont, Christopher Marshall i Mehsin Al-Ansi. "Arabian Dugongs of Qatar: Updates from a Renewed Research Initiative". W Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2016. http://dx.doi.org/10.5339/qfarc.2016.eepp2552.

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Tanaka, Kotaro, Hideaki Nishizawa, Hiromichi Mitamura, Kongkiat Kittiwattanawong, Kotaro Ichikawa i Nobuaki Arai. "Effects of environmental factors on vocalization pattern of dugongs revealed by generalized linear model". W 2016 Techno-Ocean (Techno-Ocean). IEEE, 2016. http://dx.doi.org/10.1109/techno-ocean.2016.7890747.

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Arai, Nobuaki. "Review of SEASTAR2000 Promoted by the COE Bangkok Office: Sea Turtles, Mekong Giant Catfish, Dugongs and Human Beings". W Second International Conference on Informatics Research for Development of Knowledge Society Infrastructure (ICKS'07). IEEE, 2007. http://dx.doi.org/10.1109/icks.2007.25.

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Arai, Nobuaki. "Field Informatics for Co-existence between Human Beings and Endangered Species: Sea Turtles, Mekong Giant Catfish and Dugongs". W International Conference on Informatics Education and Research for Knowledge-Circulating Society (icks 2008). IEEE, 2008. http://dx.doi.org/10.1109/icks.2008.17.

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Negri Wijaya, Daya, i Neni Wahyuningtyas. "Dugong in the Account of Stamford Raffles". W lst International Cohference on Geography and Education (ICGE 2016). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icge-16.2017.24.

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Latter, T., M. Gram-Jensen, F. Buriola, H. Dinh, M. Faggetter, R. Jupp, M. Townsend, N. Grinde, C. Mathieu i G. Byerley. "The Value of Dual-Azimuth Acquisition: Imaging, Inversion and Development over the Dugong Area". W 83rd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2022. http://dx.doi.org/10.3997/2214-4609.202210510.

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Ćurak, Nerzuk. "ZAVNOBIH: POLITIČKA IMAGINACIJA PRAVEDNOG RATA". W 75. godišnjica Trećeg zasjedanja ZAVNOBiH-a: uloga Trećeg zasjedanja ZAVNOBiH-a u društvenom i političkom razvoju Bosne i Hercegovine. Akademija nauka i umjetnosti Bosne i Hercegovine, 2020. http://dx.doi.org/10.5644/pi2020.193.01.

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Ako su prva dva zasjedanja ZAVNOBiH-a, u vihoru narodnooslobodilačke borbe, proizveli i dali politički legitimitet kolektivističkoj ideji zajedništva bosanskohercegovačkih naroda (Prvo zasjedanje) i ideji građanstva kao tendirajućem, pluralističkom jedinstvu pobjednika rata (Drugo zasjedanje), onda je Treće zemaljsko zasjedanje (iako se u smislu anticipacije političke reprezentacije, reduciralo na etnonacionalnu kolektivističku paradigmu kao maksimalni doseg u budućoj, postratnoj proizvodnji političkog), istovremeno iznjedrilo ideju Republike koja će svoj tronacionalitet emancipirati svepokrivajućim revolucionarnim logosom Komunističke partije kao avangarde koja neće dozvoliti da se bosanskohercegovački vektor historije ponovno vrati na staze bratoubilačkog rata. Povijesna je činjenica da je upravo Titova partija onemogućila proizvodnju međunacionalnog nasilja tokom višedecenijskog jugoslovenskog mira, interpolacijom zavnobihskih uzansi o nacionalnoj ravnopravnosti u politički sistem BiH na način koji je onemogućavao institucionalni prodor nacionalizma. Već je ta činjenica dugog mira dovoljna da u suvremenim interpretacijama ZAVNOBiH-a odemo dalje od odigrane historije i ponudimo, na osnovu znanstvene imaginacije, nove interpretativne uklone, novu, interdisciplinarnu teoriju ZAVNOBiH-a.
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