Dissertationen: „Endangered species“

1

Tsai, Lin-wai. „The laws for protecting endangered species in Hong Kong and Singapore /“. View the Table of Contents & Abstract, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37117348.

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2

Wilkinson, Timothy John. „Cryopreservation of rare and endangered species“. Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312121.

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3

McGowan, Conor P. „Incidental take and endangered species demography“. Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5595.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on June 9, 2009) Vita. Includes bibliographical references.

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4

Costante, Delaney. „Endangered Species Act: Quantifying Threats Impacting Listing“. W&M ScholarWorks, 2021. https://scholarworks.wm.edu/etd/1627047881.

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With species increasingly becoming imperiled due to anthropogenic activities, conservation practitioners are tasked with determining conservation priorities in order to make the best use of limited resources. The United States’ Endangered Species Act (ESA) has two listing statuses into which imperiled species are placed to receive protections: Threatened or Endangered. In the first chapter, our objective was to identify differences between Threatened and Endangered species beyond what is outlined in their ESA definitions. To our knowledge, this is the first study to compare listing status for species protected by the ESA on the basis of types and number of threats they face. For six broad-scale threats (habitat modification, overutilization, pollution, species-species interactions, environmental stochasticity, and demographic stochasticity), we investigated whether there is a difference in the number and types of threats which impact Threatened and Endangered species at the time of their listing. We found that Threatened (X̄ = 2.9, SD = 1.4) and Endangered (X̄ = 3.0, SD = 1.1) species were faced by a similar number of threats at their time of their listing. The only broad-scale threat that disproportionately impacted Endangered species more than Threatened species was demographic stochasticity; Endangered species were 1.9 times (95% CI = 1.4 -2.7) more likely to have this threat than Threatened species. We found four finer-scale demographic stochasticity threats (few individuals in one population, few individuals in multiple populations, lack of reproduction, and genetic loss) to be strong predictors of Endangered status. The similarities in the number and types of broad-scale threats faced by Threatened and Endangered species suggest that changes recently made to the ESA may be detrimental to the recovery efforts of future Threatened species. In the second chapter, our objective was to identify temporal trends in threats facing the four major phyla protected by the United States Endangered Species Act: angiosperms, arthropods, mollusks, and vertebrates. For 24 threat types, we created models to determine whether there was a linear, quadratic, or pseudo-threshold association between year and the probability that a phylum was listed with a given threat. We were able to identify temporal trends for 79% of the 96 possible threat-phylum combinations. We found that angiosperms had the highest peak probability of being listed with the greatest number of threats (N = 10), followed by mollusks (N = 8) and more distantly by arthropods (N = 4) and vertebrates (N = 2). We found that vertebrates had the greatest number of threats (N = 16) for which the year with their greatest probability of their being listed with a threat was their most recent year of listing. The other three phyla were similar to each other for this metric, mollusks having 12 and angiosperms and arthropods each having 11 threats peak in their most recent year of listing. We only identified one threat/phylum combination for which the maximum probability of their being listed with a threat was in their first year of listing (i.e., the threat has been consistently decreasing): authorized take impacting angiosperms. Overall, we believe our findings can be used to assist conservation efforts by identifying which threats have been decreasing or stable over time and which have been increasing that are in need of more attention.

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5

Aboul-Khair, Shahira. „An Evaluation of Species Recovery under the U.S. Endangered Species Act“. Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31854.

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The U.S. Endangered Species Act (U.S. ESA) is one of the oldest pieces of legislation to protect endangered species. The bodies responsible for administering the U.S. ESA have published species Biennial Recovery Statuses (BRSs) in Reports to Congress on the Status of Endangered and Threatened Species. We found that expert assessments of species recovery trends match BRSs reasonably well; however, there appears to be a weak relationship between the BRSs and available data tracking species abundance and range trends. We aimed to establish whether the recovery trends of species examined were detectably associated with their threats, the general U.S. ESA tools, or recovery actions. We found positive associations between species recovery and two U.S. ESA tools – mean annual funding and peer-reviewed scientific information. However, correlations with other variables differ greatly depending on how recovery is defined. Species threats and recovery actions are also moderately related to their abundance and range trends.

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6

Trachy, Suzanne 1962. „The Endangered Species Act: Political implications of delisting a recovered species“. Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291698.

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The Endangered Species Act of 1973 (ESA) reflects society's concern over the rate of species extinction and aims to halt or reverse this trend. Several policies of the ESA protect listed species over resource development projects. Due to this protection, several listed species have recently experienced a recovery. Two have been removed, or delisted, from the federal Endangered Species list. Once a recovered species becomes delisted, the majority of these protections are removed. This paper analyzes the political implications of such delistings utilizing formal interviews, personal experiences, and a literature search. Through analysis, it is found that two specific policies seem to protect delisted species. It is concluded that a quantitative analysis may be premature at this time due to the small number of recovered species and that these policies must be effected to their fullest potential to ensure the long-term success of the federal endangered species program.

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7

Snow, Melanie Jennifer. „Ovarian xenografting for the conservation of endangered species“. Monash University, Dept. of Physiology, 2003. http://arrow.monash.edu.au/hdl/1959.1/9557.

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8

Rabung, Emily A. „U.S. Military Land Management and Endangered Species Conservation“. The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595240047775966.

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9

Littlefield, Joanne. „Helping Endangered Species: The Desert Amphibian Breeding Project“. College of Agriculture, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/295847.

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10

Lyons, Reneé C. „Trips and Treks: Teaching Endangered Species Through Literature“. Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/2367.

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11

Tam, Yee-wa Audrey. „A study of fauna species endangered by traditional habits of Chinese communities in Hong Kong /“. View the Table of Contents & Abstract, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37117397.

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12

Roland, Helen Elizabeth. „Science in environmental policy : defining species under the federal Endangered Species Act /“. For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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13

Herman, John. „Herpetofaunal communities in agroecosystems : the effect of farm management style /“. See Full Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1114016439.

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14

Derbridge, Jonathan, und Jonathan Derbridge. „Ecology and Conservation of Endangered Territorial Species Under Invasion“. Diss., The University of Arizona, 2018. http://hdl.handle.net/10150/626655.

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Biological invasions threaten biodiversity globally, and degraded ecosystems increase the potential for invaders to compete with threatened native populations. In natural systems, niche partitioning minimizes interspecific competition, but introduced species may alter expected outcomes by competing with ecologically similar species for scarce resources. Where food production is highly variable, coexistence of native and invasive competitors may depend on dietary niche flexibility. Territorial species under invasion face additional challenges to maintain economically defendable territories. From 2011-2016, we conducted removal and behavior experiments to determine effects of non-territorial introduced Abert’s squirrels (Sciurus aberti) on diet, space use, and territoriality of endangered Mount Graham red squirrels (MGRS; Tamiasciurus fremonti grahamensis) in their declining habitat in the Pinaleño Mountains, Arizona. We collected comparative data from Arizona sites of natural syntopy between Abert’s and Fremont’s squirrels (T. fremonti). Stable isotope analysis revealed similar dietary partitioning among populations. Experimental removals did not appear to affect MGRS diet. Space use by MGRS responded inconsistently to removals; territory sizes increased after the first removal, but did not change following the second removal. Territory sizes and body mass of MGRS were sensitive to conspecific population density and food production. Behavioral experiments showed MGRS were more aggressive than other Fremont’s squirrels (hereafter, red squirrels). Dietary flexibility of Abert’s squirrels may have facilitated coexistence with MGRS, possibly due to coevolved resource partitioning with red squirrels. However, aggressive territoriality toward Abert’s squirrels may incur fitness costs for MGRS especially during poor food production years. Climate change may reduce the advantage of ecological specialist species globally, and where introduced species are better-adapted to novel environmental conditions, native species may ultimately be replaced.

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15

King, Narelle Gaye. „Tourism based on reintroductions of threatened mammals achieving positive conservation outcomes /“. Diss., Click here to access, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20070212.113043.

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16

Webb, Trevor John. „The conservation of threatened species in South Australia /“. Title page, table of contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09ENV/09envw368.pdf.

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17

Kreivi, M. (Marjut). „Conservation genetics and phylogeography of endangered boreoarctic seashore plant species“. Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514290190.

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Abstract The amount and distribution of genetic diversity are likely to affect the evolutionary potential of a species. When feasible and cost-effective policies for management and monitoring of endangered populations or species are planned, knowledge of the spatial genetic structure and the type of population dynamics is of great concern. In this thesis the genetic diversity and population structures of two endangered arctic plant species was examined on different geographical scales in Northern Europe. The species were Siberian primrose (Primula nutans) and pendant grass (Arctophila fulva), which both grow in a seashore habitat and have similar distribution patterns on the shores of the Arctic Ocean and the Bothnian Bay. The goal of the present study was to provide basic population genetic information for the study species using microsatellite and AFLP markers. Both markers were used for the first time in these species, and species-specific microsatellite markers were developed during the study. A further aim was to interlink the population genetic processes of the species into distribution patterns at the regional and population levels and to compile a synthesis of the impact of hierarchical spatiotemporal processes and autocorrelation in genetic variation at different levels. The studies of this thesis provided new information on the diversity and population structure of the endangered study species and new markers that are useful in future genetic studies of primrose species. The diversity of Siberian primrose was low, and there was no dispersal between the study regions. In pendant grass, a relatively high amount of variation was found considering the evident clonal reproduction and gene flow that was detected between populations connected by waterways. The results suggested that both clonal and sexual reproduction are important in this species. On a local scale, pendant grass populations had characteristics of “stepping stone” and classical metapopulation models. The results indicated that on a long time scale, both species will continue to decline without efficient management efforts. Most critical for the persistence of the species is the conservation of suitable habitats. Translocations could be considered in order to enhance the diversity of existing populations and establish new populations. By examining the present day structure of Siberian primrose, it was possible to make inferences regarding the colonisation history of the species in the North European area. The current distribution of Siberian primrose seemed to result from a vicariant process that took place after the last ice-age, when the species colonised the area. It spread first to the White Sea area, probably from the east, and subsequently colonised the Bothnian Bay and the Barents Sea in the west. The isostatic land uplift after the retreat of the Eurasian ice sheet uncovered large areas of land from the Baltic Sea basin that previously were under water. These geological changes resulted in the current disjunct distribution of Siberian primrose.

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18

Hens, H. (Hilde). „Population genetics and population ecology in management of endangered species“. Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526215853.

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Abstract Knowledge of the determinants of the viability of populations is essential in order to undertake effective conservation and management of endangered species. In this study, long-term demographic data was combined with genetic data to study the viability of an endangered orchid species, Epipactis atrorubens. The genetic analyses revealed low levels of genetic variation and the presence of population genetic differentiation independent of the spatial scale. Low levels of seed-mediated gene flow, possibly linked to low seedling recruitment, is the likely cause of the low levels of gene flow. Indications of slow post-glacial colonisation rates were found, which together with the low gene flow predict a limited capacity of the species to shift its range to more suitable habitats after environmental change. Low genetic variation as a proxy for low evolutionary potential also suggests that the species has limited capacity to adapt to new environmental conditions. Furthermore, poor seedling recruitment lowers population viability in small populations, as highlighted by the low population growth rates. In addition, we found a strong effect of stochasticity that limits the viability of populations. Both the genetic and demographic analyses indicated low viability of the studied species and that seedling recruitment could be the main determinant for the viability
Tiivistelmä Luonnonsuojelun perusta on populaatioiden elinkykyyn vaikuttavien tekijöiden tuntemus. Tässä väitöskirjatyössä tutkittiin uhanalaisen orkidean, tummaneidonvaipan (Epipactis atrorubens), elinkykyyn vaikuttavia tekijöitä yhdistämällä pitkäaikaisseurannoilla kerätyt demografiset aineistot geneettisin menetelmin kerättyihin aineistoihin. Lajin populaatioiden geneettisen muuntelun määrän havaittiin olevan pieni ja populaatioiden todettiin olevan geneettisesti erilaistuneita maantieteellisestä skaalasta riippumatta. Geneettisen erilaistumisen syy voi olla alhainen geenivirta, joka on seurausta vähäisestä siemendispersaalista ja huonosta taimettumisesta. Populaatioiden evolutiivista historiaa tutkittaessa havaittiin merkkejä hitaasta jääkauden jälkeisestä kolonisaatiosta, mikä yhdessä alhaisen geenivirran kanssa ennustaa, että lajilla on huono kyky siirtyä sille sopivammille alueille, jos ympäristö muuttuu. Huonoa evolutiivista potentiaalia kuvastava vähäinen geneettinen muuntelu ennustaa, että lajilla on huono kyky sopeutua uusiin ympäristöoloihin. Tämän lisäksi huono taimettuminen laskee elinkykyä etenkin pienissä populaatioissa, mikä näkyy muun muassa pienten populaatioiden matalina kasvukertoimina. Stokastinen vaihtelu vaikutti elinkykyä alentavasti, mikä pitäisikin huomioida nykyistä paremmin elinkykyanalyyseissä. Sekä geneettiset että demografiset analyysit osoittivat taimettumisen mahdollisesti olevan määräävä tekijä tummaneidonvaipan populaatioiden elinkyvylle

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19

Johnson, Connie Nicole. „Stem cutting propagation of the endangered species, Clematis socialis (Kral)“. Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Fall/Theses/JOHNSON_CONNIE_58.pdf.

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20

Sommers, Mark S. „Let wildlife live : a computer illustrated calendar of endangered species /“. Online version of thesis, 1993. http://hdl.handle.net/1850/11970.

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21

Lo, Chau-Yee. „Endangered species : the harpsichord and its new repertoire since 1960“. Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/430/.

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The twentieth-century harpsichord has an unusual history: coming out of oblivion at the end of the nineteenth century, it was given a new lease of life, but at the same time acquired a mistaken identity. This thesis examines, from the perspective of the harpsichordist, the two types of harpsichord prominent in the musical mainstream in the twentieth century, and specific pieces written for both between 1960 and 1990. The two types of instrument under discussion are (1) the modern pedal harpsichord modelled after the instrument tailor-made for Wanda Lartdowska and (2) the historical instrument which emerged and proliferated in the latter part of the twentieth century. In particular it focuses on the two different types of music composed for the two instruments, starting with Maurice Ohana's Carillons pour les heures du jour et de la nuit (1960), written for the modern pedal harpsichord, through Gyorgy Ligeti's Continuum (1968), also written for the pedal instrument, to two ensemble pieces including the historical harpsichord: Chiel Meijering's n'Dame scheert haar benen (1981) for harpsichord and guitar, Ton Bruynes Schrootsonate (1990) for harpsichord and soundtracks, and Iannis Xenakis's Khoar, for the modern pedal instrument. Finally, it examines Elliott Carter's Double Concerto for Harpsichord and Piano with Two Chamber Orchestras (1961), the most elaborate harpsichord work to date. The detailed analyses encompass a flexible but consistent methodology, drawing on the experience of the performer to elucidate the different ways different composers have related to the different characteristics of the two types of harpsichord. The thesis concludes by summarising the development of harpsichord repertoire from 1960, making inferences from the foregoing discussion, and commenting on the possibility of continuing development of harpsichord repertoire in the twentieth-first century.

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22

So, Rachel I. „Does Additional Habitat Protection Facilitate the Recovery of Species Protected by the Endangered Species Act?“ Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30910.

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Earlier studies have found that endangered species recovery is only weakly associated with the tools enabled by the U.S. Endangered Species Act (ESA). With habitat loss often cited as a leading cause of species declines, we tested whether the recovery of ESA-listed species is instead associated with the protection of critical habitat (CH) by protected areas. We tested the relationship for 299 species using recovery indices derived from the biennial status reports to Congress (1990-2010), as well as NatureServe and IUCN population status data. We found no overall relationship between recovery and the extent to which CH is protected. However, restricting the analysis to recovering species, listed species with larger areas of protected (R2 = 0.158) or strictly protected (R2 = 0.194) CH fared better than species with less protected or strictly protected CH areas. Declining species (199 of 273 species studied) fared no better with more protected habitat. We conclude that the abatement of habitat loss alone does not necessarily facilitate recoveries for the majority of ESA-listed species. We also note that the weak relationships we observed in this study may be reflective of poor recovery status estimates.

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23

Gwinn, R. Nathan, und John L. Koprowski. „Differential response to fire by an introduced and an endemic species complicates endangered species conservation“. ASSOC TERIOLOGICA ITALIANA, 2016. http://hdl.handle.net/10150/625219.

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Fire is a natural component of, and serves as a tool for, the restoration of forested ecosystems worldwide; however, disturbance due to fire also has been implicated in the proliferation of invasive species. How these fires affect occupancy and use of the forest by wildlife is of great concern, in particular, the differential response of non-native and native species. In the North American Southwest, prior to European settlement, frequent wildfires helped to maintain forest structure. We examined the effect of a large wildfire on an introduced population of the Abert's squirrel (Sciurus aberti) that has invaded the high elevation forests inhabited by the critically endangered Mt. Graham red squirrel (Tamiasciurus fremonti grahamensis). We found that introduced Abert's squirrels were more common than native red squirrels in burned areas. Abert's squirrels did not abandon burned areas but nested, foraged, and did not adjust their home range size in burned areas. This suggests that invasive Abert's squirrels are better able to exploit burned areas than native red squirrels and that fire can favor non-native species. This interaction between non-native species, native species, and fire adds new insight into the complexities of conservation and restoration of ecosystems and helps to inform conservation activities worldwide.

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24

White, Steve. „Population trends, conservation and the trade in amphibians in Asia“. Thesis, View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B34737364.

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25

Ball, Jonathan Bradford. „Approaches towards a critical evaluation and update of the red list of South African butterflies /“. Link to the online version, 2006. http://hdl.handle.net/10019/196.

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26

Noonan, David J. „Toward a bioregional policy and practice for the conservation of threatened biodiversity /“. Title page, contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09ENV/09envn817.pdf.

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27

Klövekorn, Henning Andreas. „Endangered bird species in South Australia : are current recovery practices for the Orange-bellied parrot and Kangaroo Island glossy black cockatoo succeeding? /“. Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09ENV/09envk66.pdf.

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28

Malmberg, Jennifer. „The effects of disease, stress, and distribution on bighorn sheep restoration in Nebraska /“. Chadron, Neb. : Chadron State College, 2008. http://www.nlc.state.ne.us/epubs/G1000/B129-2008.pdf.

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Thesis submitted to the graduate faculty of Chadron State College in partial fulfillment of the requirements for the degree of Master of Arts in Education.
"June, 2008". Includes bibliographical references. Also available in PDF via the World Wide Web.

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Tsai, Lin-wai, und 謝連偉. „The laws for protecting endangered species in Hong Kong and Singapore“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B45013603.

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30

Rahn, Matthew Edward. „Evaluating science and policy : conservation planning and the Endangered Species Act /“. For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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Koo, Barnabas Hon-Mun, University of Western Sydney, of Arts Education and Social Sciences College und School of Humanities. „The Survival of an endangered species : the Macanese in contemporary Macau“. THESIS_CAESS_HUM_Koo_B.xml, 2004. http://handle.uws.edu.au:8081/1959.7/637.

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The decolonisation of Macau on 20 December 1999 marked a powerful transition for the small Macanese community. Prior to transfer of sovereignty, there have been grave concerns for the survival of these miscegenic descendants of the Portuguese settlers who came to China some five hundred years ago. Many feared that there would be a mass exodus similar to that which overtook the former Portuguese colonies in Africa and East Timor, and that the Macanese future would be threatened by the process of Sinicisation – in short, that they are a dying race. This thesis examines such fears using a combination of newspaper survey, extensive fieldwork and repeat interviews. The outcome of the research shows that despite the dire prognostication, the community has survived the first five years of Chinese rule in robust form; the feared exodus did not eventuate and there has been no death to speak of. In the post-colonial environment, the Constitutions (Macau Basic Law) obliges the government to respect Macanese customs and cultural traditions and to protect their rights – at least for fifty years. The Macanese community in Macau is likely to continue to transform itself and adapt to a changing environment. It is likely that the transformation will occur over a long period of time, representing generations, perhaps centuries not decades. It is then more appropriate to view the Macanese community in Macau as an endangered – not dying – species
Doctor of Philosophy (PhD)

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Koo, Barnabas Hon-Mun. „The Survival of an endangered species : the Macanese in contemporary Macau“. Thesis, View thesis, 2004. http://handle.uws.edu.au:8081/1959.7/637.

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The decolonisation of Macau on 20 December 1999 marked a powerful transition for the small Macanese community. Prior to transfer of sovereignty, there have been grave concerns for the survival of these miscegenic descendants of the Portuguese settlers who came to China some five hundred years ago. Many feared that there would be a mass exodus similar to that which overtook the former Portuguese colonies in Africa and East Timor, and that the Macanese future would be threatened by the process of Sinicisation – in short, that they are a dying race. This thesis examines such fears using a combination of newspaper survey, extensive fieldwork and repeat interviews. The outcome of the research shows that despite the dire prognostication, the community has survived the first five years of Chinese rule in robust form; the feared exodus did not eventuate and there has been no death to speak of. In the post-colonial environment, the Constitutions (Macau Basic Law) obliges the government to respect Macanese customs and cultural traditions and to protect their rights – at least for fifty years. The Macanese community in Macau is likely to continue to transform itself and adapt to a changing environment. It is likely that the transformation will occur over a long period of time, representing generations, perhaps centuries not decades. It is then more appropriate to view the Macanese community in Macau as an endangered – not dying – species

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Koo, Barnabas Hon-Mun. „The Survival of an endangered species the Macanese in contemporary Macau /“. View thesis, 2004. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20060510.151501/index.html.

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34

Hellenbroich, Tobias. „Europäisches und deutsches Artenschutzrecht : der gebietsunabhängige Schutz heimischer wildlebender Arten /“. Stuttgart : Ibidem-Verl, 2006. http://www.gbv.de/dms/spk/sbb/recht/toc/504596527.pdf.

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35

Walters, Catherine. „Genetic relationships among Spiranthes parksii and congeneric species“. Texas A&M University, 2005. http://hdl.handle.net/1969.1/4814.

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Using four AFLP markers and seven polymorphic microsatellite loci, we examined the genetic structure of the rare and endangered Spiranthes parksii Correll (Orchidaceae). Spiranthes parksii is not distinguishable from sympatric S. cernua (L.) Rich based on these data, though low levels of polymorphisms exist within both. These low levels of genetic diversity are likely a result of high levels of agamospermic reproduction through adventitious embryony. These results suggest that both S. parksii, as well as the sympatric, open flower form of S. cernua, are products of the more widely distributed S. cernua complex. Further, another local form of S. cernua, distinguished by its tendency to produce closed flowers is genetically distinct from both S. parksii, as well as the openflower form of S. cernua, as shown by AFLPs and microsatellite loci. This is the first known set of microsatellite primers developed specifically for use in Spiranthes. The application of these markers may be used to address other unresolved relationships among species of Spiranthes, many of which are also endangered or have populations in decline.

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Celand, Lee. „Sustainable wildlife trade under the Convention on International Trade in Endangered Species :“. Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397567.

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Ando, Amy Whritenour. „Endangered species protection and National Forest timber sales : three essays in economics“. Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10675.

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38

Briceño, Urzúa Cristóbal. „Genetic structure and epidemiological threats in two Chilean endangered insular canid species“. Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708149.

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39

Smith, Tracy L. „Habitat conservation planning under the Endangered Species Act : is it ecosystem management? /“. Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-05022009-040550/.

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40

Milner-Gulland, E. J. „The exploitation of certain large mammals for trade : the implications for management“. Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/8376.

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41

Taylor, Rebecca Lynn. „A multistate mark recapture analysis to estimate reproductive rate in the Steller sea lion (Eumetopias jubatus), an endangered species“. Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/taylor/TaylorR0509.pdf.

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The Steller sea lion is an endangered species whose reproductive rate estimates need to be updated. The species is divided into two populations: the endangered western population has declined over 80% from historical levels, while the threatened eastern population has been increasing at approximately 3% for the past three decades. The statistically most compelling reproductive rate estimates for this species are based on now out of date population dynamics, and hence are not applicable to current concerns. Extensive recent branding and resighting efforts by the Alaska Department of Fish and Game in Southeast Alaska make possible an updated estimation of eastern population Steller sea lion reproductive rates. However, the complexity of these data required a different statistical approach than is typically used to estimate reproduction in marked and resighted animals. I developed a novel statistical analysis, based upon a multistate mark recapture likelihood function, specifically to analyze the Southeast Alaska Steller sea lion data. The likelihood function estimates a reproductive rate when only adult females (not pups) are marked, female sightability is correlated with reproductive status, state classification uncertainty is present and the population is open to births during many of the resighting intervals. I apply this analysis to the Southeast Alaska Steller sea lion data and estimate a reproductive rate of 0.66 (0.55, 0.77). Not only does this provide a reproductive rate estimate for the eastern population, which is important for monitoring its health, but it also provides a basis for comparison to the endangered western population. Furthermore, the Alaska Department of Fish and Game continues to have an active branding and resighting program. The methods developed here can be applied to future data collected in either population.

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42

Mattingly, Hayden Thomas. „Spatially nested models of habitat use by the Niangua darter, Etheostoma nianguae : a threatened Ozark stream fish /“. free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9962545.

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43

Van, Bloemestein Ulric Patrick. „Seasonal movement and activity patterns of the endangered geometric tortoise, Psammobates geometricus“. Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&amp.

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Due to the critical status of Psammobates geometricus and the vulnerability of their habitat, there is a need to allocate areas for their protection. The aim of this study was to provide information on the space requirements and activity level of geometric tortoises to facilitate future conservation efforts.

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44

Gorissen, Sarsha. „Conservation biology of the endangered Blue Mountains Water Skink (Eulamprus leuraensis)“. Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15731.

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The Blue Mountains Water Skink (Eulamprus leuraensis), restricted to the endangered habitat of highland peat-swamps, is known from fewer than 60 isolated sites in the Blue Mountains region of south-eastern Australia. The sole endemic vertebrate of the region, this scincid lizard is imperilled by many threats. From three years of field surveys, I show that E. leuraensis live almost exclusively within swamps, with very few inhabiting the swamp margins and none recorded in the surrounding woodland. Paradoxically, this endangered species appears to be the most abundant vertebrate in these swamps. My surveys show that urbanisation and frequent major fires both reduce the abundance of these skinks, but do not extirpate them. A longer period of time since a major fire, conversely, increases the abundance of this reptile. Groundwater loss and alterations in surface water chemistry extirpate populations of this species: its restriction to groundwater-dependent swamps renders it highly sensitive to habitat degradation through hydrological disturbance. To conserve E. leuraensis in the wild, we need to protect its swamp habitat from the impacts of urbanisation, intensified fire regimes, reduced groundwater, water pollution and longwall mining. The conservation message for management authorities is clear: ‘protect the habitat, protect the skink.’

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Nakahama, Naoyuki. „Conservation ecology of endangered species in semi-natural ecosystems based on genetic analysis of extant and specimen samples“. 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225653.

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46

Slack, John Taylor. „A comprehensive methodology for measuring costs and benefits of critical habitat designation under the Endangered Species Act“. Thesis, Available online, Georgia Institute of Technology, 2003:, 2003. http://etd.gatech.edu/theses/available/etd-11252003-091701/unrestricted/slackjohnt200311Masters.pdf.

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47

Bremner, S. „Behavioural and molecular ecology of a captive-bred colony of the endangered swift fox, Vulpes velox“. Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269046.

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48

Kochera, Stephanie S. „Private ownership of wild animals including endangered species conflict on the urban fringe“. Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1029184666.

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49

[Verfasser], Umaporn Rungroekrit. „Alternative methods of semen preservation: a pig model for endangered species / Umaporn Rungroekrit“. Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2014. http://d-nb.info/1065276117/34.

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50

Liu, Jie. „The co-existence of endangered primate species and ethnic groups in southwest China“. Kyoto University, 2020. http://hdl.handle.net/2433/253136.

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付記する学位プログラム名: 霊長類学・ワイルドライフサイエンス・リーディング大学院
Kyoto University (京都大学)
0048
新制・課程博士
博士(理学)
甲第22300号
理博第4614号
新制||理||1662(附属図書館)
京都大学大学院理学研究科生物科学専攻
(主査)教授平田聡, 教授幸島司郎, 教授伊谷原一
学位規則第4条第1項該当

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Dissertationen zum Thema „Endangered species“

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