• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 26
  • 7
  • 4
  • 2
  • 1
  • 1
  • 1
  • Tagged with
  • 64
  • 17
  • 15
  • 14
  • 12
  • 11
  • 10
  • 10
  • 8
  • 7
  • 7
  • 6
  • 6
  • 6
  • 6
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Ecology of lawbreaking:effects of poaching on legally harvested wolf populations in human-dominated landscapes

Suutarinen, J. (Johanna) 23 April 2019 (has links)
Abstract Illegal killing of wolves (hereinafter ’wolf poaching’) in human-inhabited areas where wolves are also legally harvested is a special case of wildlife crime. This doctoral thesis examines wolf poaching in Finland and Sweden from the ecological perspective. In the first paper, we examined the causes of mortality among collared Finnish wolves and the role of estimated poaching rates on population changes. The second paper related the likelihood of being poached to covariates expressing different dimensions of the wolf conflict at two spatial scales (territory and country level) in Finland. Third paper turns the focus to Sweden, where we examined the disappearances of adult wolves in relation to population size, legal harvest and inbreeding. The first two studies were done in collaboration with the Natural Resources Institute Finland (Luke) and the third with the Scandinavian wolf research project SKANDULV. Poaching outnumbered other causes of death. Most poaching cases were unverified. Other causes of death were legal harvest, traffic and natural mortalities. Both populations had a relatively high number of wolves with unknown fates. Inbreeding was not related to the disappearances of adult wolves in Sweden. Remoteness to human inhabitation and the detectability of the wolves from the forest roads (road crossings by wolves) increased the likelihood of poaching in Finland. Adult wolves suffered high risk of poaching in both populations. Risk was highest in early spring in Finland. Larger population size increased and the number of legally harvested wolves decreased poaching in both countries. Poaching seemed to limit the study populations despite the management efforts that used legal hunting as a tool to increase tolerance towards wolves. / Tiivistelmä Suden ja ihmisen rinnakkainelo johtaa konflikteihin, joiden lievittämiseksi susikantoja rajoitetaan usein luvallisella metsästyksellä. Suteen kohdistuu lisäksi laitonta tappamista eli salametsästystä. Tämä väitöstutkimus selvittää salametsästyksen ekologisia vaikutuksia Suomen ja Ruotsin susipopulaatioihin. Ensimmäisessä osatyössä selvitimme suomalaisten pantasusien kuolinsyitä, arvioimme salametsästyksen voimakkuutta ja sen vaikutuksia populaatiotasolla. Toisessa osatyössä tarkastelimme susikonfliktiin liittyvien ennustetekijöiden vaikutusta laittomasti tapetuksi tulemisen riskiin reviiritasolla ja koko Suomen mittakaavassa. Kaksi ensimmäistä osatyötä tehtiin Luonnonvarakeskuksen (Luke) suurpetotutkimuksessa. Kolmas osatyö tehtiin osana skandinaavista susitutkimushanketta (SKANDULV). Siinä selvitimme populaatiokoon, luvallisen pyynnin ja sukusiittoisuuden vaikutuksia aikuisten susien katoamiseen Ruotsissa. Salametsästys oli susien yleisin kuolinsyy, mutta suurin osa tapauksista jää toteen näyttämättä. Muita kuolinsyitä olivat luvallinen metsästys, liikenne ja luonnolliset kuolinsyyt. Aineistoissa oli runsaasti kohtaloltaan tuntemattomaksi jääneitä yksilöitä. Yksilöiden sukusiittoisuusaste ei ollut yhteydessä susien katoamisiin Ruotsissa. Syrjäinen sijainti ja susien havaittavuus metsätiestöltä lisäsivät laittoman tapon todennäköisyyttä Suomessa. Salametsästysriski oli korkein kevättalvella. Aikuisilla susilla oli huomattavan korkea riski tulla laittomasti tapetuksi. Tutkimuksen perusteella salametsästyksen määrää selittävät erityisesti susipopulaation kulloinenkin koko ja luvalliset pyyntimäärät. Suurempi susikanta lisäsi salametsästystä ja metsästyslupien määrä vähensi sen riskiä. Salametsästys vaikuttaa säädelleen susikantoja siitä huolimatta, että susikonfliktia on pyritty lieventämään luvallisella metsästyksellä.
22

Effects of Olfactory Enrichments on African Cheetahs (Acinonyx Jubatus)

Abston, Marcus Chas 01 August 2017 (has links)
AN ABSTRACT OF THE THESIS OF MARCUS C. ABSTON, for the Master of Science degree in ZOOLOGY, presented on 18 April 2017, at Southern Illinois University Carbondale. TITLE: EFFECTS OF OLFACTORY ENRICHMENT ON AFRICAN CHEETAHS (ACINONYX JUBATUS) MAJOR PROFESSOR: Dr. Carey Krajewski Environmental enrichment has been an essential part of felid husbandry in zoos, serving to reduce both physiological and psychological stress. Olfactory enrichment is one of many interventions used to prevent stereotypic behavior caused by stress in felids. However, little research has been done on this practice. The purpose of this study was to compare behavioral responses of four captive African cheetahs to six types of commercial fragrances used as olfactory enrichment stimuli. Three of these fragrances are marketed as “men’s cologne” and three as “women’s perfume”. The fragrances were also categorized as musky, spice, and floral types. Behavioral responses were recorded by live observations during 36 bouts at the St. Louis Zoo. There was a significant difference between cheetahs’ interaction time with male and female fragrances; they seemed to prefer male colognes. However, there was no significant difference in interaction time among fragrance types. Engagement behaviors varied among individuals (e.g. sniffing, scent rolling, pawing), but were similar to those reported by previous authors. These findings suggest that commercial fragrances may be a useful option for African cheetah olfactory enrichment.
23

Sociality in a solitary carnivore, the wolverine

Dalerum, Fredrik January 2005 (has links)
<p>The social organization of animal societies has important implications for several fields of biology, from managing wild populations to developing new ecological and evolutionary theory. Although much attention has been given to the formation and maintenance of societies of group living individuals, less is known about how societies of solitary individuals have been shaped and maintained. Traditionally, the evolution of social organizations in the mammalian order Carnivora has been regarded as a directional selection process from a solitary ancestry into progressively more advanced forms of sociality. In this thesis, I tested this model against an alternative model, assuming radiation from a socially flexible ancestry. I further explored sociality, resource use and dispersal of a solitary carnivore, the wolverine (<i>Gulo gulo</i>), in the light of these two evolutionary models. Phylogenetic reconstruction generally supported that carnivore social organizations evolved through directional selection from a solitary ancestor. However, results from captive wolverine females indicated that they might have rudimentary social tendencies, which rather support that sociality in carnivores radiated from a socially flexible ancestry. Wild wolverines in northwestern Brooks Range, Alaska, adhered to the commonly found ecological niche as a largely ungulate dependent generalist carnivore. Lack of sexual asymmetry in dispersal tendencies indicated that resource competition among wolverine females probably was high. I suggest that wolverines have latent abilities to aggregate, but that their phylogenetic legacy in terms of morphology has constrained them into an ecological niche where resource abundance and distribution generally inhibit aggregations. Due to contradictory results, I suggest further research to test evolutionary theory regarding carnivore social evolution, and particularly to explore new avenues into social evolution that better explain intra-specific variation in sociality, as well as formation and maintenance of solitary social systems.</p>
24

Sociality in a solitary carnivore, the wolverine

Dalerum, Fredrik January 2005 (has links)
The social organization of animal societies has important implications for several fields of biology, from managing wild populations to developing new ecological and evolutionary theory. Although much attention has been given to the formation and maintenance of societies of group living individuals, less is known about how societies of solitary individuals have been shaped and maintained. Traditionally, the evolution of social organizations in the mammalian order Carnivora has been regarded as a directional selection process from a solitary ancestry into progressively more advanced forms of sociality. In this thesis, I tested this model against an alternative model, assuming radiation from a socially flexible ancestry. I further explored sociality, resource use and dispersal of a solitary carnivore, the wolverine (Gulo gulo), in the light of these two evolutionary models. Phylogenetic reconstruction generally supported that carnivore social organizations evolved through directional selection from a solitary ancestor. However, results from captive wolverine females indicated that they might have rudimentary social tendencies, which rather support that sociality in carnivores radiated from a socially flexible ancestry. Wild wolverines in northwestern Brooks Range, Alaska, adhered to the commonly found ecological niche as a largely ungulate dependent generalist carnivore. Lack of sexual asymmetry in dispersal tendencies indicated that resource competition among wolverine females probably was high. I suggest that wolverines have latent abilities to aggregate, but that their phylogenetic legacy in terms of morphology has constrained them into an ecological niche where resource abundance and distribution generally inhibit aggregations. Due to contradictory results, I suggest further research to test evolutionary theory regarding carnivore social evolution, and particularly to explore new avenues into social evolution that better explain intra-specific variation in sociality, as well as formation and maintenance of solitary social systems.
25

The Wolf Dilemma : Following the Practices of Several Actors in Swedish Large Carnivore Management

Ramsey, Morag January 2015 (has links)
The wolf is an endangered animal in Sweden and the issue of conserving the species is a polarizing one. Specific attention has been given to this issue in environmental social sciences with studies focusing on the divide between wolf support and opposition. These studies include looking at historical interactions with the wolf, contemporary attitudes about the issue, and the way the law shapes policy. Following this focus on the disputed nature of wolf conservation, this thesis addresses whether polarization over the issue occurs between several stakeholders in large carnivore management in Sweden. Using Actor Network Theory, this thesis examines the similarities and divergences in the stakeholders’ conservation practices and maps their interactions with one another. Emphasis is placed on how the European Union’s regulations and the Swedish State’s policies conflict and/or influence the stakeholders. Overall results show that despite a discourse of polarization surrounding wolf management in Sweden, the actors in this study cannot be easily positioned against each other, and despite some divergences, share many similarities in their large carnivore management practices.
26

Grizzly bears, roads, and human-bear conflicts in southwestern Alberta

Joseph, Northrup Unknown Date
No description available.
27

The New Visibility of Slaughter in Popular Gastronomy

Parry, Jovian Lang January 2010 (has links)
Animal slaughter has recently become highly visible in popular food media. This thesis interrogates the myths, assumptions and ideologies underlying this so-called New Carnivore movement, through critical analysis of a range of popular gastronomic texts. Socially-constructed ideas about ‘reality’, ‘sentimentality’, ‘sacrifice’, and ‘redemption’ are intimately implicated in the process of animal slaughter, as are the notions of ‘good taste’ and social distinction. The domination of animals, demonstrated through the slaughter, butchery, and consumption of nonhuman bodies, is held to be an integral component in the performance of gender, as well as a means of reconnecting, via a kind of secular epiphany, with ‘Nature’ at its most authentic. As a hostile backlash against the social progress made by the animal advocacy and vegetarian movements, New Carnivorism denigrates vegetarianism and veganism as outdated, unfashionable, unnatural, puritanical and rude. Although these texts’ potential to inspire farmed animal welfare reform should not be ignored, New Carnivorism ultimately serves to naturalize, justify and promote the continued consumption of meat, and the continued exploitation of nonhuman animals, in Western societies.
28

Grizzly bears, roads, and human-bear conflicts in southwestern Alberta

Joseph, Northrup 11 1900 (has links)
Because most grizzly bear mortalities occur near roads, the Province of Alberta plans to implement gated access management. Little is known about how grizzly bears will respond to road closures because the effects of roads are confounded by habitat and human use. I examined mechanisms underlying grizzly bear habitat selection near roads on private and public lands of southwestern Alberta. I incorporated habitat selection models into an analysis of conflict risk. Grizzly bears selected areas near roads with low traffic and were most active at night on private lands, where human use was low. However, habitat selection varied among individuals, and roads were not a consistent predictor of overall habitat selection across individual bears. Patterns of habitat selection led to the emergence of ecological traps on private land. Access and attractant management should be implemented to reduce bear-human conflicts, and decrease displacement of bears from high-quality habitats. / Ecology
29

Behavioural adjustments of lion (Panthera leo) in response to risk of human-caused mortality

Cotterill, Alayne January 2013 (has links)
Fear of predation can have a major impact on the behaviour of prey species. Despite recent codifying of the concept of the ecology of fear, there has been relatively little focus on how these ideas apply to large carnivore species which, although not prey sensu stricto, may experience fear as a result of threats from humans. This thesis argues that large mammalian carnivores are subject to a Landscape of Fear similar to that described for prey species, and will respond behaviourally to fear of human-caused mortality. The idea of a "Landscape of Coexistence" is introduced to denote the perceived risk from humans and associated behavioural responses that can be overlain on spatio-temporally heterogeneous landscapes. Literature on the ecology of fear for large mammalian carnivores and, as there is a dearth of such literature, the current theory on the ecology of fear for other guilds is reviewed, and how this might inform large carnivore behaviour in a Landscape of Coexistence is explored. Behavioural effects of human-caused mortality risk are revealed for lions living in a human dominated landscape (Laikipia County, Kenya), specifically how lions adjust their movement patterns, habitat use and foraging tactics when in proximity to humans. It is argued that these behavioural adjustments represent a trade-off between maximising fitness enhancing activities and minimising the risk of human-caused mortality, thus need to be taken into consideration along with the lethal effects of humans when explaining the density, distribution and behaviour of lions throughout much of their remaining range. Although fear is generic, 'human-caused mortality risk' represents a distinct and very important sub-set of the ecology of fear for the carnivore guild. The existence of a Landscape of Coexistence has implications for understanding their foraging ecology, and ultimately their population dynamics and role in the ecosystem, and is therefore, important for the conservation of large carnivores throughout large parts of their remaining ranges.
30

Šelmy v městském prostředí: studium rozšíření, habitatových preferencí a vybraných aspektů prostorové ekologie / Carnivores in urban environment: distribution, habitat preferences and selected aspects of urban ecology

DRAHNÍKOVÁ, Lucie January 2013 (has links)
This study provides an insight into carnivores´ responses to urban conditions. The main goal of this study is to examine changes of population densities and home range sizes of eight mesocarnivore species along the gradient from natural to urbanized habitats by gathering and assessing available data.

Page generated in 0.03 seconds