Дисертації з теми "Selective predation"
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Lyrsten, Theres. "Predation som selektiv kraft bakom differentiering av populationer av sötvattensgråsugga, Asellus aquaticus." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-63340.
Повний текст джерелаFahlman, Johan. "Size selective predation of pike on whitefish : The effects on resource polymorphism in Scandinavian whitefish populations." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-87582.
Повний текст джерелаChilton, Earl Wallace. "Macroinvertebrate communities associated with selected macrophytes in Lake Onalaska : effects of plant type, predation, and selective feeding /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487266691096246.
Повний текст джерелаAndersson, Magnus. "Selective predation by perch (Perca fluviatilis) on a freshwater isopod, in two macrophyte substrates." Thesis, Linköpings universitet, Ekologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58018.
Повний текст джерелаWorischka, Susanne. "Selective predators in complex communities – mechanisms and consequences of benthic fish predation in small temperate streams." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-170972.
Повний текст джерелаParadis, Anne R. "Theoretical work on the size-selective vulnerability to predation during the early life history stages of fishes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ47501.pdf.
Повний текст джерелаPark, Sichoon. "The selective use of chlorine to inhibit algal predators and avoid pond crashes for the algae-biodiesel industry." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51867.
Повний текст джерелаBoarman, McKaila J. S. "Trade-offs and Temporal Variation in Predator-Mediated Natural Selection and Sexual Selection on the Wings of the Damselfly Calopteryx splendens." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1491746850419119.
Повний текст джерелаWorischka, Susanne [Verfasser], Thomas [Akademischer Betreuer] Berendonk, Markus [Akademischer Betreuer] Weitere, and Jürgen [Akademischer Betreuer] Geist. "Selective predators in complex communities – mechanisms and consequences of benthic fish predation in small temperate streams / Susanne Worischka. Gutachter: Thomas Berendonk ; Markus Weitere ; Jürgen Geist. Betreuer: Thomas Berendonk." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://d-nb.info/1073207021/34.
Повний текст джерелаPetroli, Gustavo Henrique. "Modelagem matemática de predação doença-seletiva." reponame:Repositório Institucional da UFABC, 2017.
Знайти повний текст джерелаDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Matemática , 2017.
Doenças infecciosas acometem populações de presas e a escolha predatória de presas suscetíveis pode levá - la à extinção. Propusemos e analisamos um modelo matemático de interação presa - predador, com a população de presas dividida em duas classes: suscetíveis e infectadas. A subpopulação de presas suscetíveis, torna - se infectada por contato direto com a subpopulação de presas infectadas e o predador consome somente as presas suscetíveis. A análise do modelo permitiu estabelecer limiares para a propagação da doença na ausência bem como na presença de predadores, além de condições de existência e estabilidade dos pontos de equilíbrio biológicamente viáveis. Por meio de simulações numéricas determinamos as diferentes características biológicas apresentadas pelo modelo, assim como ilustramos os resultados analíticos.
Infectious diseases affect prey populations and the predatory choice of susceptible preys may lead them to extinction. We propose and analyzed a mathematical model of prey - predator interaction, with prey population divided into two classes: susceptible and infected. The subpopulation of susceptible preys becomes infected by direct contact with the subpopulation of infected preys, and the predator consumes only the susceptible ones. The analysis of the model allowed to establish thresholds for the propagation of the disease in the absence of predators, in the presence of them as well as conditions of existence and stability of biologically viable equilibrium points. Analysing the system by numerical simulations, we determine different biological characteristics presented by the model and illustrate analytical results.
Latif, Quresh S. "How predation risk shapes avian nest site selection and processes underlying nest predation patterns." Diss., [Riverside, Calif.] : University of California, Riverside, 2009. http://proquest.umi.com/pqdweb?index=0&did=1957706911&SrchMode=2&sid=4&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268765320&clientId=48051.
Повний текст джерелаIncludes abstract. Available via ProQuest Digital Dissertations. Title from first page of PDF file (viewed March 16, 2010). Includes bibliographical references. Also issued in print.
Smith, Dustin M. "Habitat selection and predation risk in larval lampreys." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10493.
Повний текст джерелаPreston, Sarah Jane. "The impact of shell damage on Calliostoma zizyphinum (Gastropoda: Trochidae)." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241431.
Повний текст джерелаKohl, Michel T. "The Spatial Ecology of Predator-Prey Interactions: A Case Study of Yellowstone Elk, Wolves, and Cougars." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7441.
Повний текст джерелаDemmons, Timothy Douglas. "Nest site selection and nest predation patterns at forest-field edges." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0021/MQ52983.pdf.
Повний текст джерелаRoger, Caroline. "Mechanisms of prey selection in the ladybeetle Coleomegilla maculata Lengi Timb. (Coleoptera:Coccinellidae)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ50249.pdf.
Повний текст джерелаMiller, Sara Elizabeth. "Intraguild predation is a mechanism of divergent selection in the threespine stickleback." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58913.
Повний текст джерелаScience, Faculty of
Zoology, Department of
Graduate
Ruddock, Marc. "Housewives' planning : Population ecology, predation and prey selection in the peregrine falcon." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479323.
Повний текст джерелаCheng, Yi-Ru. "Differential growth of body components among coexisting passerine species in response to nest predation risk." CONNECT TO THIS TITLE ONLINE, 2008. http://etd.lib.umt.edu/theses/available/etd-01132009-180702/.
Повний текст джерелаMathisen, Peter. "Environmental factors selecting for predation resistant and potentially pathogenic bacteria in aquatic environments." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133338.
Повний текст джерелаMedfinansiärer var även: Swedish Ministry of Defence (A4040, A4042, A404215, A404217), Swedish Minestry of Foreign Affairs (A4952), Swedish Civil Contingencies Agency (B4055)
Bokach, Matthew John. "The relative influences of predation and prey availability on ardeid breeding colony site selection." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0009586.
Повний текст джерелаForsman, J. (Jukka). "Heterospecific attraction in breeding bird communities:implications to habitat selection and species interactions in a landscape perspective." Doctoral thesis, Oulun yliopisto, 2000. http://urn.fi/urn:isbn:9514256263.
Повний текст джерелаJohansson, Tomas. "Habitat selection, nest predation and conservation biology in a Black-tailed Godwit (Limosa limosa) population." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-4958-1/.
Повний текст джерелаRoos, Staffan. "Nest predation processes and farmland birds : habitat selection and population dynamics of predators and prey /." Uppsala : Dept. of Conservation Biology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s301.pdf.
Повний текст джерелаIngley, Spencer J. "Repeated Trait Evolution Driven by Divergent Natural Selection at Early and Late Stages of Speciation." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6150.
Повний текст джерелаGrand, Tamara C. "Habitat selection in juvenile coho salmon, Oncorhynchus kisutch, the effects of intraspecific competition and predation risk." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24310.pdf.
Повний текст джерелаBennice, Chelsea O. "Altering life history traits a size-selective predator decreases the size of its prey. /." Connect to resource, 2008. http://hdl.handle.net/1811/32125.
Повний текст джерелаThieme, Jennifer Lee. "Behavioral and reproductive consequences of predator activity to grassland birds." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313609279.
Повний текст джерелаCruickshank, Hilary Stuart. "Prey selection and kill rates of cougars in northeastern Washington." Connect to this title online, 2004. http://www.dissertations.wsu.edu/Thesis/Summer2004/h%5Fcruickshank%5F081604.pdf.
Повний текст джерелаHalstead, Brian J. "Predator behavior and prey demography in patchy habitats." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002414.
Повний текст джерелаSkyer, Melissa. "Food habits of a re-introduced river otter (Lontra canadensis) population in western New York : annual diet, temporal and spatial variation in diet and prey selection conclusions /." Online version of thesis, 2006. https://ritdml.rit.edu/dspace/handle/1850/2590.
Повний текст джерелаSchmidt, Jason M. "Adaptive Foraging in a Generalist Predator: Implications of Habitat Structure, Density, Prey Availability and Nutrients." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1312815757.
Повний текст джерелаThomson, R. L. (Robert L. ). "Breeding habitat selection and its consequences in boreal passerines:using the spatial dispersion of predators and heterospecifics as a source of information." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514280504.
Повний текст джерелаKoskela, A. (Anni). "Wolverine habitat selection, diet and conservation genetics." Doctoral thesis, Oulun yliopisto, 2013. http://urn.fi/urn:isbn:9789526202273.
Повний текст джерелаTiivistelmä Ahma (Gulo gulo) tunnetaan sekä haaskansyöjänä että keskikokoisia hirvieläimiä ja pienriistaa saalistavana petona. Fennoskandian alueella peuran kesy tai villi muoto on ahman merkittävin saalislaji. Noin puolet Suomen 180–220 ahmasta elää Pohjois-Suomessa poronhoitoalueella, ja loput Itä- ja Keski-Suomessa. Poronhoitoalueen ulkopuolella elävien ahmojen ekologiaa on tutkittu erityisen vähän. Väitöstyössäni tarkastelin ahman habitaatinvalintaa, ruokavaliota ja populaatiogenetiikkaa pääasiassa Pohjois- ja Itä-Suomen alueilla. Tutkimukseni tulokset osoittivat, että suden läheisyys oli yksi tärkeimmistä ahman habitaatinvalintaan vaikuttavista tekijöistä. Tämä havainto tukee hypoteesia, jonka mukaan ahma saattaisi hyötyä susien läheisyydestä suuremman haaskatiheyden ansiosta. Todennäköisesti ahmat elävät mielellään samoilla seuduilla susien kanssa, mutta kaihtavat läheistä kanssakäymistä välttääkseen killansisäisen saalistuksen. Tutkimusteni perusteella sekä ahman lisääntymistila että alueen saaliseläinten saatavuus vaikuttivat ahman ruokavalioon. Poro ja metsäjänis olivat lisääntyvien ahmanaaraiden tärkein ravintokohde Pohjois-Suomessa. Itä-Suomessa merkittävin lisääntyvien naaraiden ravintokohde oli hirvi, jota ahmat hyödyntävät lähinnä haaskojen muodossa, mutta urokset ja ei-lisääntyvät naaraat sen sijaan saalistivat eniten metsäjänistä. Ahmat siis näyttävät hyödyntävän opportunistisesti sitä ravintokohdetta, joka kullakin alueella on energiatehokkainta saavuttaa. Susien ja ihmisten jälkeensä jättämät haaskat ovat merkittävä ravintolähde ahmoille alueilla, joilla keskikokoisten hirvieläinten tiheydet ovat alhaisia. Ahman populaatiogeneettinen tutkimus osoitti, että Suomen ahmat ovat geneettisesti jakautuneet kahteen alapopulaatioon, pohjoiseen ja itäiseen. Ahmakannan geneettinen monimuotoisuus oli pientä, ja molemmissa alapopulaatiossa oli nähtävissä merkkejä äskettäisestä pullonkaulailmiöstä. Populaatioiden välisen geenivirran määrän tulisi olla nykyistä korkeampi, jotta ahmakannan elinvoimaisuuden voisi katsoa olevan turvattu tulevaisuudessa
Torre, Corominas Ignasi. "Distribution, population dynamics and habitat selection of small mammals in Mediterranean environments: the role of climate, vegetation structure, and predation risk." Doctoral thesis, Universitat de Barcelona, 2004. http://hdl.handle.net/10803/787.
Повний текст джерелаMain results and conclusions
Composition and abundance of small mammals communities can be completely ascertained by using two indirect methods of small mammals sampling, genet scats and barn owl pellets. Both methods reported all the small mammals species known to be present in the study area. Genet scats were used for the first time to study the composition of small mammal communitites with a biogeographical application.
Small mammals species richness was negatively related to a gradient of productivity, which decreased with elevation. The increase of species density along elevation was observed at two spatial scales (plot and elevation belt). Small mammals mean abundance decreased with elevation, and this pattern was may be related to the decreased availability of resources and harsh environmental conditions with elevation.
The interaction between negative feedback (density-dependence) and natural environmental disturbances (seasonal and interannual changes in cumulative rainfall) seem to be relevant forces driving the dynamics of wood mouse populations in Mediterranean forests. The role of intraspecific competition and climate were equally responsible of the strong population oscillations observed during three consecutive years.
All small mammal species studied showed significant associations with gradients of short vegetation cover, either shrubs or herbs, in natural and man-disturbed habitats. Overall, species richness and abundance also showed positive associations with gradients of short vegetation cover. These patterns highlighted the dependence of small mammals on vegetation which provides food and shelter.
Early successional stages supported larger small mammal abundances than unburnt forests after controlling for structural differences between plots. I hypothesised that early successional stages would be favourable habitats to small mammals due to a combination of reduced predation risk (high vegetation cover) and reduced predation pressure (less predators), and unburnt areas would be unfavourable habitats due to a combination of increased predation risk (low vegetation cover) and increased predation pressure (more predators). Fire-related fragmentation could have promoted the isolation of forest predators (owls and carnivores) in unburned forest patches, a fact that could have produced a higher predation pressure for small mammals. Behavioural responses of small mammals to predation were also surmised, with positive associations to vegetation cover in unburnt forests and negative associations in early burned habitats. These changes in small mammal-microhabitat relationships suggest differences in perceived predation risk that may have promoted the observed changes in microhabitat use. Foraging activity of mice shifted spatially and temporally in response to the presence of genets at relevant spatial scales, and decissions about how often and how long to forage were affected by the foraging activity of genets. Summarising, our findings demonstrate that predators have a prominent role in determining the patterns of distribution of mice along the post-fire succession, and that this role is mediated, at least in part, by indirect, behavioural responses of foraging mice to increased predator pressure along such succession.
Effects of grazing on small mammals were mainly due to decreased availability of food and refuges for surviving harsh climatic conditions during winter, but not to food quality or increased predation risk. Taken together, our results indicate that small mammal communities in Mediterranean montane grasslands are bottom-up controlled by interspecific competition for food with cattle and by the limiting role of the availability of winter refuges, whereas top-down control due to generalists predators does not appear to be at work in these systems.
Eberl, Christine. "Effect of food, predation and climate on selection of breeding location by red-throated loons (Gavia stellata) in the high Arctic." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6951.
Повний текст джерелаKarlsson, Johanna. "How two different predators affect size distribution and behavior of an aquatic isopod." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69747.
Повний текст джерелаMeissner, K. (Kristian). "Consequences of predator-prey interactions in boreal streams:scaling up from processes to large-scale patterns." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514278682.
Повний текст джерелаÖstergård, Hannah. "Plant-seed predator interactions – ecological and evolutionary aspects." Doctoral thesis, Stockholm University, Department of Botany, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7537.
Повний текст джерелаPlant-animal interactions are affected by both abundance and distribution of interacting species and the community context in which they occur. However, the relative importance of these factors is poorly known. I examined the effects of predator host range, environmental factors, host plant populations, plant traits and fruit abortion on the intensity of pre-dispersal seed predation in 46 host populations of the perennial herb Lathyrus vernus. I recorded damage by beetle pre-dispersal seed predators, mainly Apion opeticum and Bruchus atomarius with different host ranges on L. vernus as well as on two additional host plants. Local seed predator population size was mainly influenced by plant population size, current seed production and beetle population size in the previous year, but was not strongly affected by connectivity. The monophagous seed predator was less abundant and had lower densities than the oligophagous. Both predator species had a strong ability to track fluctuations in seed production; intensity of predation increased with relative increases in seed production. Oligophagous predation on L. vernus increased with the abundance of alternative hosts, but presence of L. vernus did not affect predation on alternative hosts. Abundances and trait preferences differed among three co-occurring seed predators, but were also associated with the abundance of the other species. Overall, seed predation influenced selection on flower number. I found clear indications of seed predator offence but no obvious plant defence. The pattern of fruit abortion was associated with reduced plant fitness since the seed predator had an advanced ability to locate fruits with high probability of retention. Taken together, different factors influencing abundance of the seed predator species, different preferences, and context dependent trait selection are likely to result in complex spatio-temporal variation in overall seed losses and trait selection in the common host plant.
Clements, Hayley Susan. "Incorporating prey demographics and predator social structure into prey selection and carrying capacity estimates for cheetah." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1018606.
Повний текст джерелаKopec, Audrey Dianne. "Prey Selection in Gulf of Maine Harbor Seals (Phoca vitulina) in Relation to Fish Abundance and Fish Mercury Concentrations." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/KopecAD2009.pdf.
Повний текст джерелаMahoney, Peter J. "Spatial Ecology of Coyotes and Cougars: Understanding the Influence of Multiple Prey on the Spatial Interactions of Two Predators." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/5658.
Повний текст джерелаSpjern, Victor. "Hur påverkar storskarv (Phalacrocorax carbo) och skäggdopping (Podiceps cristatus) fisksamhället i grunda, näringsrika sjöar?" Thesis, Linköpings universitet, Biologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166546.
Повний текст джерелаBaxter, Jared Jeffrey. "Reproductive Ecology of Greater Sage-Grouse in Strawberry Valley, Utah." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6580.
Повний текст джерелаOtsuki, Hatsune. "Interactions between Spider Mites and Predators in Systems with Dispersal Opportunities." Kyoto University, 2020. http://hdl.handle.net/2433/253311.
Повний текст джерела0048
新制・課程博士
博士(農学)
甲第22475号
農博第2379号
新制||農||1074(附属図書館)
学位論文||R2||N5255(農学部図書室)
京都大学大学院農学研究科地域環境科学専攻
(主査)教授 日本 典秀, 教授 田中 千尋, 准教授 刑部 正博
学位規則第4条第1項該当
Englund, Göran. "Competition in caddis larvae." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 1992. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-101356.
Повний текст джерелаDiss. (sammanfattning) Umeå : Umeå universitet, 1992, härtill 5 uppsatser
digitalisering@umu
Wasko, Dennis Keith. "Spatial and Feeding Ecology of the Fer-de-Lance (Bothrops asper) in Costa Rica." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/206.
Повний текст джерелаSilva, Leonardo Henrique da. "Seleção de dormitórios pelos micos-leões-pretos : uma comparação entre floresta contínua e fragmento /." Rio Claro, 2019. http://hdl.handle.net/11449/183152.
Повний текст джерелаResumo: A seleção de dormitórios pelos primatas pode ser influenciada por diversos fatores, como a predação, termorregulação e defesa de território. Nosso objetivo foi investigar quais desses fatores influenciam a seleção de dormitórios pelos micos-leões-pretos e se há divergência nas características dos dormitórios entre uma floresta contínua e um fragmento. Estudamos dois grupos de mico-leões-pretos, um numa floresta contínua e um num fragmento na região do Pontal do Paranapanema, São Paulo, Brasil. Nós coletamos os dados sobre as características físicas dos dormitórios e das árvores disponíveis no habitat. Usamos testes de Mann-Whitney para comparar as características físicas dos dormitórios com as árvores disponíveis e Funções de Seleção de Recursos (RSF) para entender quais dessas características são mais importantes na escolha dos dormitórios. Os micos-leões-pretos usaram árvores mais altas, com menor número de conexões de copas e com um alto grau de cobertura de copa para dormir, quando comparado às árvores disponíveis. Os dormitórios usados pelo grupo da floresta contínua eram maiores, com as primeiras ramificações inferiores mais altas e com menor número de conexão de copas do que os dormitórios usados pelo grupo do fragmento. Nossos resultados evidenciam a presença de estratégias anti-predação pelos grupos de micos-leões-pretos, com o grupo da floresta contínua apresentando um processo de seleção de dormitórios mais refinado, no qual a seleção apenas de árvores que possuam ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Sleeping site selection by primates can be influenced by several factors, such as predation, thermoregulation and territorial defense. Our objective was to investigate which of these factors influence the sleeping site selection by black lion tamarins and if there is divergence in the characteristics of the sleeping sites between a continuous forest and a fragment. We studied two groups of black lion tamarins, one in a continuous forest and one in a small and isolated fragment in the Pontal do Paranapanema, São Paulo, Brazil. We collected data on the physical characteristics of the sleeping sites and available trees within the both habitats. We used Mann-Whitney tests to compare the physical characteristics of the sleeping sites with available trees and Resource Selection Functions (RSF) to understand which of these characteristics are most important in choosing the sleeping sites. Black lion tamarins used taller trees, with a fewer canopy connections, and a higher degree of canopy cover compared to the available trees. The sleeping sites used by the continuous forest group were larger, with the first lower ramifications higher and with fewer number of canopy connections than the sleeping sites used by the fragment group. Our results evidenced the presence of anti-predation strategies by both black lion tamarin groups, with the continuous forest group presenting a more refined sleeping site selection process, in which the selection of only trees with a larger set of character... (Complete abstract click electronic access below)
Mestre
Corral, López Alberto. "The link between brain size, cognitive ability, mate choice and sexual behaviour in the guppy (Poecilia reticulata)." Doctoral thesis, Stockholms universitet, Zoologiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-148547.
Повний текст джерелаAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 5: Manuscript.
Kaartinen, S. (Salla). "Space use and habitat selection of the wolf (Canis lupus) in human-altered environment in Finland." Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514293825.
Повний текст джерелаTiivistelmä Susi on habitaattigeneralisti, jonka levinneisyys kattaa kaikki pohjoisen pallonpuoliskon kasvillisuustyypit. Sudet myös lisääntyvät hyvin ja voivat näin ollen levittäytyä nopeasti uusille alueille. Suomessa susi on riistalaji, jonka metsästys on rajoitettua Euroopan unionin jäsenyyden myötä. Lähinnä tästä syystä Suomen susikanta on kasvanut voimakkaasti 1990-luvun ja 2000-luvun alun aikana. Erityisesti syntyvyys on kasvanut: pentueiden määrä lisääntyi neljästä 20:een vuosien 1996 ja 2005 välillä. Näyttäisi siltä, ettei Suomen nykyinen susipopulaatio enää seuraa Venäjän Karjalassa tapahtuvia kannanvaihteluita. Väitöskirjan tavoitteena on ollut tuottaa susikannan hoidossa ja suojelussa käytettävissä olevaa tietoa ja erityisesti tutkia susikannan levittäytymistä ihmisen muokkaamassa ympäristössä Suomessa. Neljässä osatutkimuksessa on käsitelty suden habitaatinvalintaa eri näkökulmista, jotta saataisiin kokonaiskuva suden tilankäytöstä Suomessa. Tutkimusaineisto rakentui pitkäaikaisesta seuranta-aineistosta, jota on kerätty vuodesta 1989 lähtien. Vuosien 1989 ja 2010 välillä 85 sutta on pannoitettu radio- tai GPS-GSM –pannalla. Tutkimuksessa käytettiin hyväksi myös noin 30 000 vuosittain tehtyä jälkihavaintoa. Tutkimustulosten perusteella susi selviää hyvin Suomen monikäyttömetsissä, eivätkä maisematyypit itsestään rajoita susipopulaation kasvua ja levittäytymistä. Toisaalta tulokset osoittavat myös sen, että sudet välttelevät ihmistoimintoja valitessaan reviiri- tai pesäpaikkoja. Kuitenkin susien lukumäärän kasvaessa ristiriitatilanteet susien ja ihmisten välillä tulevat lisääntymään, vaikka susivahinkoriskin suuruus vaihteleekin Suomessa huomattavasti. Esimerkiksi lammastilojen susivahinkoriski riippuu sekä ympäristötekijöistä, että tilan sisäisistä tekijöistä. Kaiken kaikkiaan lisääntyvän susipopulaation esiintymisalue on Suomessa vähitellen kasvanut leviten itärajan tuntumasta kohti länttä. Tämän myötä maantieteellinen etäisyys Skandinavian susipopulaatioon on pienentynyt viimeisten vuosien aikana. Tämä voi edesauttaa susiyksilöiden siirtymistä Suomesta Skandinaviaan