Дисертації з теми "Marsupials Conservation"
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Firestone, Karen Beth School of Biological Science UNSW. "The Application of Molecular Genetics to the Conservation Management of Quolls, Dasyurus Species (Dasyuridae:Marsupialia)." Awarded by:University of New South Wales. School of Biological Science, 1999. http://handle.unsw.edu.au/1959.4/17491.
Повний текст джерелаPereira, Viviane Morlanes. "Ecologia de pequenos mamíferos (Didelphimorphia e Rodentia) em uma área de caatinga do Rio Grande do Norte." Universidade Federal Rural do Semi-Árido, 2016. http://bdtd.ufersa.edu.br:80/tede/handle/tede/635.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The Caatinga biome occurs in the states of the states of Maranhão, Piauí, Ceará, Rio Grande do Norte, Pernambuco, Paraíba, Alagoas, Sergipe, Bahia and Minas Gerais, in Brazil. Despite being the only exclusively Brazilian ecosystem, few resources for research on biodiversity and conservation are devoted to this biome. The generation of knowledge on biodiversity of the Caatinga is essential for establishing effective strategies for management and conservation of species and habitats, particularly in a biome as sensitive and as threatened this one. The present work is divided into two chapters. The first one is an extensive literature review on the occurrence, distribution and chromosomal characteristics of species of small terrestrial mammals recorded in the Caatinga. The second chapter presents data on diversity, ecology and seasonality of a community of small terrestrial mammals (Didelphimorphia and Rodentia) using capture-marking-recapture methods throughout twelve successive months in a well-preserved native forest fragment of Caatinga located at the Experimental Farm Rafael Fernandes from the Universidade Federal Rural do Semi-Árido, Mossoró-RN
O bioma Caatinga ocorre nos estados do Maranhão, Piauí, Ceará, Rio Grande do Norte, Pernambuco, Paraíba, Alagoas, Sergipe, Bahia e Minas Gerais, no Brasil. Apesar de ser o único ecossistema exclusivamente brasileiro, poucos recursos para pesquisas sobre biodiversidade e conservação são voltados para este bioma. A geração de conhecimento sobre a diversidade biológica da Caatinga torna-se essencial para estabelecer estratégias eficazes de gestão e conservação de espécies e habitats, particularmente em um bioma tão sensível e ameaçado como esse. O presente trabalho se divide em dois capítulos e, o primeiro, consiste em uma extensa revisão bibliográfica sobre a ocorrência, distribuição e características cromossômicas das espécies de pequenos mamíferos terrestres que habitam a Caatinga. O segundo capítulo, apresenta dados sobre diversidade, ecologia e sazonalidade de uma comunidade de pequenos mamíferos terrestres (Didelphimorphia e Rodentia) através de um estudo usando o método de captura-marcação-recaptura ao longo de doze meses sucessivos de amostragem em um fragmento de mata nativa de Caatinga bem conservada situada na Fazenda Experimental Rafael Fernandes da Universidade Federal Rural do Semi-Árido, Mossoró-RN
2017-03-24
Aberton, John G., and mikewood@deakin edu au. "Succession of small mammal communities after fire and reintroduction of the Swamp Antechinus Antechinue Minimus." Deakin University. School of Biological and Chemical Sciences, 1996. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051111.122639.
Повний текст джерелаMiller, Emily Jane Biological Earth & Environmental Sciences Faculty of Science UNSW. "Conservation genetics and reproduction in three Australian marsupial species." Publisher:University of New South Wales. Biological, Earth & Environmental Sciences, 2008. http://handle.unsw.edu.au/1959.4/42779.
Повний текст джерелаHing, S. "Stress, wildlife health and the conservation of a critically endangered marsupial, the woylie." Thesis, Hing, S. (2016) Stress, wildlife health and the conservation of a critically endangered marsupial, the woylie. PhD thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/36359/.
Повний текст джерелаMutton, Thomas Y. "Evolutionary biology of the Australian carnivorous marsupial genus Antechinus." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/104321/6/Thomas_Mutton_Thesis.pdf.
Повний текст джерелаMason, Eugene D. "Ecology and conservation of a new carnivorous marsupial species: The silver-headed Antechinus (Antechinus argentus)." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/118725/1/Eugene_Mason_Thesis.pdf.
Повний текст джерелаBenfer, David L. "Passive acoustic monitoring of calling activity provides an optimised field survey methodology for the threatened pouched frog, Assa darlingtoni." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/104558/1/David_Benfer_Thesis.pdf.
Повний текст джерелаGray, Emma L. "Ecology and status of a new species of carnivorous marsupial, the Black-Tailed Dusky Antechinus (A. Arktos) and its relationship with a sympatric congener, the Brown Antechinus (A. Stuartii)." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/112503/1/Emma_Gray_Thesis.pdf.
Повний текст джерелаFirestone, Karen B. "The application of molecular genetics to the conservation management of quolls, Dasyurus species (Dasyuridae : Marsupialia) /." 1999. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20010105.095232/index.html.
Повний текст джерелаCzarny, Natasha. "Advances in assisted reproductive techniques for the conservation of Australian carnivorous marsupials." Thesis, 2009. http://hdl.handle.net/1959.13/44623.
Повний текст джерелаIn Australia almost 40% of the carnivorous marsupials, or dasyurids, are threatened. Assisted reproductive techniques (ART), especially genome resource banking, have the potential to contribute to the conservation of these species by reducing the loss of genetic diversity. This project aimed to advance the knowledge of ART in dasyurids by focusing on the long term preservation of male and female gametes and establishing protocols for the production of mature oocytes for use in future ART. These studies used the fat tailed dunnart (Sminthopsis crassicaudata) as a model dasyurid and replicated many of the findings on threatened dasyurids. Dasyurid spermatozoa had a relatively unstable acrosome which lacked acrosomal membrane disulphide stabilisation. There was no evidence that S. crassicaudata spermatozoa were susceptible to high concentrations of cryoprotectants, but spermatozoa frozen with up to 40% glycerol using a rapid freezing protocol were not viable. Nonetheless the morphology and acrosomal integrity of frozen spermatozoa was normal and there was no evidence of DNA damage. The lack of success with cryopreservation is likely to be an artifact of cold shock, which was observed in S. crassicaudata and had not previously been described in any other marsupial. This susceptibility to low temperature can be overcome by slow cooling spermatozoa to 0 ºC at 0.5 ºC minute -1 with up to 20% egg yolk, and it is likely that this finding will result in successful sperm cryopreservation in the near future. Freeze drying spermatozoa represents an additional strategy for long term sperm preservation and freeze dried S. crassicaudata spermatozoa had normal morphology and nuclear integrity. In this study preserved dasyurid spermatozoa were immotile and non-viable but had no nuclear damage, suggesting that fertilisation may be achieved with intracytoplasmic sperm injection (ICSI). As ICSI requires a large number of mature oocytes to be collected, a reliable timed ovarian stimulation protocol was established in S. crassicaudata. This protocol enabled the collection of up to 28 oocytes which were either mature, or able to be cultured to the first polar body stage within 48 hours. Despite the success of induced ovulation, methods for preservation of the female gamete are essential to genome resource banking. This study also described a protocol for the enzymatic dissociation of dasyurid ovarian tissue allowing collection of high quality individual preantral follicles. The oocytes inside these follicles were able to be vitrified without any loss of viability and short term in vitro culture of immature follicles repaired the small amount of vitrification-induced damage to the surrounding granulosa cells. This collection of studies describes progress in genome resource banking for spermatozoa and oocytes from dasyurids and the development of protocols allowing the collection of a large number of oocytes for use in fertilisation experiments. These advances provide a solid and comprehensive framework for continuing the study of dasyurid ART which is timely due to the urgent need for genome resource banking in several threatened dasyurid marsupials.
Czarny, Natasha. "Advances in assisted reproductive techniques for the conservation of Australian carnivorous marsupials." 2009. http://hdl.handle.net/1959.13/44623.
Повний текст джерелаIn Australia almost 40% of the carnivorous marsupials, or dasyurids, are threatened. Assisted reproductive techniques (ART), especially genome resource banking, have the potential to contribute to the conservation of these species by reducing the loss of genetic diversity. This project aimed to advance the knowledge of ART in dasyurids by focusing on the long term preservation of male and female gametes and establishing protocols for the production of mature oocytes for use in future ART. These studies used the fat tailed dunnart (Sminthopsis crassicaudata) as a model dasyurid and replicated many of the findings on threatened dasyurids. Dasyurid spermatozoa had a relatively unstable acrosome which lacked acrosomal membrane disulphide stabilisation. There was no evidence that S. crassicaudata spermatozoa were susceptible to high concentrations of cryoprotectants, but spermatozoa frozen with up to 40% glycerol using a rapid freezing protocol were not viable. Nonetheless the morphology and acrosomal integrity of frozen spermatozoa was normal and there was no evidence of DNA damage. The lack of success with cryopreservation is likely to be an artifact of cold shock, which was observed in S. crassicaudata and had not previously been described in any other marsupial. This susceptibility to low temperature can be overcome by slow cooling spermatozoa to 0 ºC at 0.5 ºC minute -1 with up to 20% egg yolk, and it is likely that this finding will result in successful sperm cryopreservation in the near future. Freeze drying spermatozoa represents an additional strategy for long term sperm preservation and freeze dried S. crassicaudata spermatozoa had normal morphology and nuclear integrity. In this study preserved dasyurid spermatozoa were immotile and non-viable but had no nuclear damage, suggesting that fertilisation may be achieved with intracytoplasmic sperm injection (ICSI). As ICSI requires a large number of mature oocytes to be collected, a reliable timed ovarian stimulation protocol was established in S. crassicaudata. This protocol enabled the collection of up to 28 oocytes which were either mature, or able to be cultured to the first polar body stage within 48 hours. Despite the success of induced ovulation, methods for preservation of the female gamete are essential to genome resource banking. This study also described a protocol for the enzymatic dissociation of dasyurid ovarian tissue allowing collection of high quality individual preantral follicles. The oocytes inside these follicles were able to be vitrified without any loss of viability and short term in vitro culture of immature follicles repaired the small amount of vitrification-induced damage to the surrounding granulosa cells. This collection of studies describes progress in genome resource banking for spermatozoa and oocytes from dasyurids and the development of protocols allowing the collection of a large number of oocytes for use in fertilisation experiments. These advances provide a solid and comprehensive framework for continuing the study of dasyurid ART which is timely due to the urgent need for genome resource banking in several threatened dasyurid marsupials.
Witt, Ryan Robert. "Advances in oestrous synchronisation technology for assisted breeding in marsupials." Thesis, 2018. http://hdl.handle.net/1959.13/1388197.
Повний текст джерелаOestrous synchronisation technology has the capacity to advance genetic conservation outcomes for threatened marsupials by making use of selected spermatozoa in artificial insemination (AI). A technique capable of precise control of oestrus and ovulation in marsupials, of which most are spontaneous ovulators, remains the key limiting factor in developing practical AI programs. The major impediment is the corpus luteum (CL) which in marsupials becomes independent of hypothalamic-pituitary support after formation and persists in both pregnant and non-pregnant cycles. For this reason, eutherian synchronisation techniques that rely on targeting CL life have failed to induce luteolysis in marsupials. The aim of this thesis was to investigate the potential to circumvent the marsupial CL and synchronise oestrous by targeting the hypothalamic-pituitary gonadal (HPG) axis with a gonadotrophin-releasing hormone (GnRH) agonist. GnRH agonists are small molecules rapidly removed from the body and thus are traditionally delivered as multiple injections or in slow release implants not suitable for assisted breeding applications. In contrast, Lucrin® Depot (AbbVie), a GnRH agonist in microspheres effects a one-month suppression of pituitary function after a single injection. In this thesis, I detail the potential for Lucrin Depot to synchronise oestrous in two taxonomically distinct marsupials with alternative reproductive strategies, a dasyurid, the fat-tailed dunnart (Sminthopsis crassicaudata,) and a macropod, the tammar wallaby (Notamacropus eugenii). In the fat-tailed dunnart, a dose of 5 mg kg–1 or 10 mg kg–1 of Lucrin Depot, resulted in reproductive suppression for 4 to 8 weeks, a return to reproductive activity at 8 to 12 weeks, and a complete return to cycling at 16 weeks. Following Lucrin-induced suppression, female dunnarts were fertile and conceived as early as 8 weeks after receiving 5 mg kg–1 but did not conceive until 14 or 15 weeks after receiving 10 mg kg–1. In tammar wallabies that underwent removal of pouch young (Day 0 RPY), Lucrin Depot inhibited the growth of pre-ovulatory follicles (all follicles <2mm, Day 31 RPY). An effective dose, 1.25 mg kg–1, delays oestrus until between Day 39-66 RPY if Lucrin-treated at the time of RPY, and between Day 43-71 RPY if Lucrin-treated on Day 10 RPY. The outcome of work in both the fat-tailed dunnart and tammar wallaby resolved that Lucrin Depot has the capacity to inhibit ovarian follicular activity, but alone does not synchronise oestrous to a degree needed for assisted breeding. In the final research chapter, I show Lucrin Depot can be combined with exogenous gonadotrophins for ovarian stimulation and synchronisation. Pre-treatment of tammar wallabies with 1.25 mg kg-1 of Lucrin Depot on Day 0 RPY prior to single doses of 20IU of PMSG on Day 20 RPY and 500IU of hCG on Day 23 RPY, synchronised oestrus and copulation to within 1 day (Day 26±0.1 RPY, n= 5 of 6). At autopsy and follow-up ovarian histology, it was determined that 20IU of PMSG adequately stimulates the heathy growth of pre-ovulatory follicles (around 10+ follicles >3mm per ovary Day 31 RPY). However, both the control superovulation group, and the Lucrin Depot-superovulation group did not ovulate in response to a single 500IU injection of hCG. Together the data presented in this thesis confirm that Lucrin Depot can form the basis of an oestrous synchronisation strategy in marsupials, and with further work to resolve the optimum ovulation treatment, it can be expected to become a practical assisted breeding tool for the recovery of threatened marsupials.
Malekian, Mansoureh. "Molecular systematics and conservation genetics of gliding petaurids (Marsupialia: petauridae)." 2007. http://hdl.handle.net/2440/41539.
Повний текст джерелаhttp://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1295224
Thesis (Ph.D.) -- School of Earth and Enviromental Sciences, 2007
Malekian, Mansoureh. "Molecular systematics and conservation genetics of gliding petaurids (Marsupialia: petauridae)." Thesis, 2007. http://hdl.handle.net/2440/41539.
Повний текст джерелаThesis (Ph.D.) -- School of Earth and Enviromental Sciences, 2007
Villasenor, Nelida R. "Biodiversity Conservation in Urbanising Forested Landscapes." Phd thesis, 2015. http://hdl.handle.net/1885/102183.
Повний текст джерелаDavey, Stuart McDonald. "The environmental relationships of arboreal marsupials in a eucalypt forest : a basis for Australian forest wildlife management." Phd thesis, 1989. http://hdl.handle.net/1885/142232.
Повний текст джерелаMcLean, Amanda Louise. "Conservation biology of an endangered semi-arid marsupial, the sandhill dunnart (Sminthopsis psammophila)." Thesis, 2015. http://hdl.handle.net/2440/99090.
Повний текст джерелаThesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Biological Sciences, 2015.
Whitehead, Tegan Carla. "Population trends, habitat requirements and conservation recommendations for an endangered marsupial, the northern bettong (Bettongia tropica)." Thesis, 2018. https://researchonline.jcu.edu.au/58748/1/JCU_58748-whitehead-2018-thesis.pdf.
Повний текст джерелаBatson, William Guy. "A tactics-based approach for improving the outcomes of eastern bettong (Bettongia gaimardi) reintroductions." Phd thesis, 2015. http://hdl.handle.net/1885/101799.
Повний текст джерелаBurnett, Scott Edward. "Ecology and conservation status of the northern spot-tailed quoll, Dasyurus maculatus with reference to the future of Australia's marsupial carnivores." Thesis, 2001. https://researchonline.jcu.edu.au/17435/1/01front.pdf.
Повний текст джерелаTaggart, Patrick Leo. "Ecology of Cat-borne Parasitoses in Australia." Thesis, 2019. http://hdl.handle.net/2440/119825.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Animal & Veterinary Sciences, 2019