Tesis sobre el tema "White-backed"
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Stighäll, Kristoffer. "Habitat composition and restocking for conservation of the white-backed woodpecker in Sweden". Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-46073.
Texto completoFunding agency: Swedish Society for Nature Conservation (SSNC)
Leepile, Leungo Boikanyo L. "Changes in nesting numbers and breeding success of African White-backed Vultures in northern Botswana". Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29737.
Texto completoRankka, Elias. "Factors influencing the white-backed woodpeckers' (Dendrocopos leucotos) choice of feeding trees in the Umeå region". Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187169.
Texto completoDurrant, Kate y n/a. "The Genetic and Social Mating System of a White-Backed Population of the Australian Magpie (Gymnorhina tibicen tyrannica)". Griffith University. Australian School of Environmental Studies, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040716.093636.
Texto completoDurrant, Kate. "The Genetic and Social Mating System of a White-Backed Population of the Australian Magpie (Gymnorhina tibicen tyrannica)". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366788.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Australian School of Environmental Studies
Full Text
Huber, Ottar. "Lövskogsgynnande åtgärders effekt på vitryggig hackspett : En studie över hur lövskogsåtgärder påverkar födoinsekter för den vitryggiga hackspetten (Dendrocopos leucotos) i Västerbotten". Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-174913.
Texto completoPhipps, W. L. (William Louis). "Spatial patterns of land-use by immature African white-backed vultures (Gyps africanus) captured in the North-West Province, South Africa". Diss., University of Pretoria, 2011. http://hdl.handle.net/2263/24947.
Texto completoDissertation (MSc)--University of Pretoria, 2011.
Paraclinical Sciences
unrestricted
Beverskog, Lynx. "Klassificering av skogar förvitryggig hackspettsmöjligheter till häckning vidnedre Dalälven". Thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105479.
Texto completoHallbäck, Christoffer. "Inmätning och utvärdering av potentiellt habitat för Dendrocopos leucotos vid Erken : Mätning och beräkning av mängden levande och döda lövträd". Thesis, Karlstads universitet, Institutionen för miljö- och livsvetenskaper (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-67597.
Texto completoThe white-backed woodpecker has been a highly threatened in Sweden since 1970 due to drastically changed habitats as a result from industrialized forestry methods with a high focus on conifers. Today there are only 2 known breeding pairs left at Dalälven in Sweden. Compared to Finland and Latvia the white-backed woodpecker exhibits a strong presence with large populations as the forestry industry in these countries differs from Sweden in terms of what type of trees they use and how they manage dead wood. The purpose of this study is to assess whether an area at lake Erken’s northern shore called Hasselhorn in Stockholm County achieves the guidelines determined by Naturvårdsverket. Naturvårdsverket has determined that the white-backed woodpecker at least need 20m3/ha dead deciduous trees in a habitat and an average age of >80 years to be considered as an optimal area for the white-backed woodpecker. The focus area was localized with IR-images to determine an area rich with deciduous trees and an area of 100ha was drafted. Sixty sample points were randomized in the area. All living and dead trees at each points were measured with a tree caliper and clinometer to determine the amount of wood in m3/ha. Age was determined visually for each sample point. The study showed that Hasselhorn currently does no achieve the optimal status for all parameters in the study to make it a suitable habitat for the white-backed woodpecker. On the other hand, the area does meet the guideline set by Naturvårdsverket of more than 20m3/ha dead deciduous wood and more than 75% deciduous trees in the area, however it does not show an average age of >80 years. Species distribution of living deciduous trees exhibits large volumes of aspen, which is considered to be a main source of food since they contain the type of bugs preferred by the white-backed woodpecker. With the right conservation methods, the study shows that Hasselhorn can become a viable habitat for the white-backed woodpecker in the near future.
Steinwall, Anders. "To do or not to do : dealing with the dilemma of intervention in Swedish nature conservation". Licentiate thesis, Umeå universitet, Statsvetenskapliga institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-128925.
Texto completoEcosystem restoration in policy and practice: restore, develop, adapt (RESTORE)
Mckechnie, Andrew Edward. "Thermoregulation and nocturnal heterothermy in the white-backed mousebird (Colius colius)". Thesis, 1998. http://hdl.handle.net/10413/10271.
Texto completoThesis (M.Sc.)-University of Natal, Pietermaritzburg, 1998.
Lin, Huan-Chao y 林煥超. "Pricing Credit Card Receivables-backed Securities With Hull-White Interest Rate Model". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/08624738552087616029.
Texto completo國立臺灣大學
國際企業學研究所
92
The benefits of credit card receivables-backed securities include less legal constraints and simpler cash flow than other kinds of MBS; therefore, they’re easier to issue. For financial institutions, credit card ABS can reduce the costs of raising funds and improve the financial structures. For investors, they also can increase the outlets for investments and have tax saving effects. Besides, many banking institutions urge consumer finance in recent years, and how to handle the increasing receivables will become a serious problem in the future. At the first of my essay, I give a brief introduction of credit card ABS, including the issuing process, participants, comparison of special purpose vehicles, types of amortization structures, and sources of risks. Since having separated the amortization structures into slow pay, rapid pay, controlled- amortization, and bullet-payment structures, we can see each representative formula for cash flow. Then, I concisely explain the Hull-White Interest Rate Model and the Dharan Forward Induction in order to use them calculate the price of securities. According to the preset data, we can conduct to some meaningful results through sensitivity analysis. Prices will be affected no matter under the variables that belong to credit card ABS or the interest rate model. Finally, wish this research can do some favor for credit card ABS in our country.
FAN, CHIH JENG y 范志仁. "The Valuation of Mortgage-Backed Securities by two-factor Hull and White Interest Rate Model". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/85309209457656388129.
Texto completo國立高雄第一科技大學
金融營運系碩士班
89
The effect of a valuation of mortgage-backed security includes the uncertainly of the risk of default and prepayment. Previous researches on the valuation of mortgage-backed securities, have been focused on the one-factor security valuation framework, that the borrower will prepay when the mortgage’s coupon rate exceeds refinancing rate. This article provides two-factor security valuation framework, considering the fluctuation of interest rate(Hull-White)and mortgaged house values. The two factors are interest and mortgaged house values. Assuming that interest rate follows Hull and White model and the mortgaged house values follows lognormal model. We use the method of valuation procedures that Hilliard, Kau, and Slawson(1998)jointly developed and the equations of forward induction that Dharan(1991)introduced to value MBS in lattice. Finally, we summarize our valuation results as follow: 1.The higher the house values volatility emerges, the lower the value of MBS appears. 2.The higher the interest rate volatility emerges, the higher the value of MBS appears. 3.The higher the mean-reverting parameter emerges, the higher the value of MBS appears. 4.The larger the speed-of-prepayment parameter emerges, the lower the value of MBS appears.
Howes, Caroline G. "Power line risk to Cape (Gyps coprotheres) and white-backed (G. africanus) vultures in Southern Africa". Thesis, 2016. http://hdl.handle.net/10539/21046.
Texto completoThis study examined the movements of white-backed (Gyps africanus) and Cape vultures (G. coprotheres) to assess their habitat preferences, measure seasonal changes in foraging behaviour, and examine where vultures are at risk of electrocution by and collision with power lines. White-backed and Cape vultures are two Old World vulture species found in southern Africa. They are listed as Critically Endangered and Endangered respectively, with massive population declines over the past three decades. These declines are due to poisoning, habitat loss, lack of food, use in traditional medicine, and electrical infrastructure mortality. Vultures provide key ecosystem services such as reducing disease transmission, cycling nutrients, and attracting tourists and therefore, a loss of vultures could cost the continent millions of US dollars. Thirteen vultures (five white-backed and eight Cape vultures) were tracked using either DUCK-4A or BUBO-4A GPS-GSM trackers (Ecotone Telemetry, Sopot, Poland). Birds were tracked between April 2013 and October 2014. These data were used to examine the habitat suitability of both species using MaxEnt habitat suitability modelling. Key drivers of country-wide habitat suitability for white-backed vultures were mean temperature (30.9% contribution), precipitation seasonality (22.0% contribution), and biome (19.5% contribution), while key drivers for Cape vultures were distance to artificial feeding station (24.8% contribution), and precipitation seasonality (50.5% contribution). Anthropological variables (land use, cattle density, and population density) contributed very little to the models. Using the same tracking data, seasonal changes in foraging movements were examined, particularly in relation to hypothetical food availability. Data were categorised by seasons (winter, spring, summer, and autumn) using weather data over the past decade. There was little evidence for seasonal movement in white-backed or Cape vultures which may be because food availability is not the limiting factor regardless of time of year. Lastly, a model was constructed in MaxEnt using the Endangered Wildlife Trust’s Wildlife and Energy Programme dataset of white-backed and Cape vulture electrocutions by and collisions with power lines. Voltage was a major contributor to risk in every model for both collision and electrocution. This is likely to be related to the type and height of the power line structures rather than actual voltage. Either land use or population density also contributed to all four models. Slope contributed to white-backed vulture models while feeding station and elevation contributed to Cape vulture models. Each of these variables probably relates not only to the likelihood of vulture presence but also how vultures behave in the area (e.g. flying lower in natural or low population areas to forage more effectively therefore putting them at higher risk of collision). This study suggests that management initiatives should include carefully placing vulture feeding stations to change foraging patterns and provide safe, uncontaminated carrion, and proactive retrofitting of high risk power lines to reduce the high unnatural mortality in white-backed and Cape vultures in South Africa. It is important to continue to improve these models using more tracking data from more populations of white-backed and Cape vultures, and more electrocution and collision data gathered from regular, randomly selected power line surveys.
M T 2016
"Conservation of the great white pelican (Pelecanus onocrotalus) and the pink-backed pelican (P. rufescens) in south eastern Africa". Thesis, 2006. http://hdl.handle.net/10413/2667.
Texto completoThesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2006
Chen, Yun-ju y 陳韻如. "Foraging Ecology of the White-Backed Woodpecker, Picoides leucotos, in the Quercus Zone of Da-Hsuen-Shan Mountain Area, Taiwan". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/05313037101649434660.
Texto completo國立臺灣大學
森林學系
85
I studied the foraging ecology of the White-backed Woodpecker (Picoides leucotos) in the Quercus zone of Da- Hsuen-Shan Mountain Area, Taiwan, from October 1995 to November 1996. The study focused on foraging habitat selection and intersexual and interseasonal foraging resource partitioning. During 180 observations of White-backed Woodpecker foraging they were observed utilizing 25 tree species in the study area. The foraging habitat of White-backed Woodpecker contained stands with characters of old-growth forest. The White-backed Woodpeckers prefered stands with more partially dead trees, and prefered trees which are Fagaceae, partially dead, Meso- or Mega- phanerophytes. Males and females differed in their foraging behavior, the dbh of trees and the diameter at foraging site selected for foraging. Males foraged on trees 25-75cm dbh, larger than 100cm dbh more than females and foraged on trees smaller than 25cm dbh, 75-100cm dbh less than females. In addition, male White-backed Woodpeckers foraged on trunks or branches greater than 10cm diameter more than females and on trunks or branches smaller than 10cm diameter less than females. Males used probing behavior more than females, and used scaling behavior less than females. Males used foraging resources more evenly than females. It is not known if this difference is associated with sexual dimorphism or intrapair dominance. The foraging behavior, the height at foraging site and condition of trees used by White-backed Woodpeckers during the breeding and non-breeding seasons differ. During the breeding season partially dead trees and snags are used more, and live trees less, than during the non-breeding season. During the breeding season the height at foraging site increases with more foraging above 15m and less foraging below 15m. Finally, White-backed Woodpeckers used scaling behavior more, and probing behavior less, during the breeding season than at other times. This is probably due to seasonal changes in food availability or endogenous physiological requirements of White-backed Woodpecker. Further studies are needed on the White-backed Woodpecker diet and foraging to understand the intersexual and interseasonal resource partitioning observed during this study.