Дисертації з теми "Succès reproductif"
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Jean, Donald. "L'intégration physiologique chez la chicouté, Rubus chamaemorus, et sa contribution au succès reproductif." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ31738.pdf.
Повний текст джерелаMuller, Karen. "Influence de la plante hôte sur les performances sexuelles des mâles et conséquences sur le potentiel reproductif des femelles phytophages." Thesis, Dijon, 2016. http://www.theses.fr/2016DIJOS021/document.
Повний текст джерелаThe abundance of phytophagous insects is determined by numerous interacting biotic and abiotic factors. In capital-breeding phytophagous insects, larval host plant quality is a key determinant of the adult phenotype and the performance of both males and females. Curiously, if the effect of host plant quality on female reproductive success is well-established, little effort has been conducted to determine this effect on male reproductive success. Moreover, in Lepidoptera, males transfer to females a spermatophore containing sperm and accessory gland products rich in nutrients that could be reinvested into female reproduction. The aim of this thesis was to evaluate how male larval nutrition on different host cultivars affects male reproductive traits which could, in turn, influence female reproductive output and mate choice strategies in an important grapevine pest, the European grapevine moth (Lobesia botrana). During these three years, we found that the host cultivar for the larvae strongly influences the energy reserves of male adult moths, affecting ultimately their reproductive potential through the size and content of spermatophores they transfer to females at mating. Moreover, male investment in the spermatophore declines over consecutives matings, suggesting that spermatophores are energetically expensive to produce in this monandrous capital breeding species. Thus ‘male quality’ depends on both the male larval origin and mating history, and females receiving protein-rich spermatophores at mating have an overall greater reproductive output than females mated with poor quality males producing less nutritionally rich spermatophores. Finally, females are able to discriminate among males and mate more with males having high sperm quality (virgin males or males from certain cultivars or geographical origins) to obtain substantial direct benefits.The results of this thesis confirm the importance of considering the “male effect” when trying to understand the evolution of phytophagous populations. Moreover, identifying the ecological conditions that influence the mating success of male and female in crop-pest species may lead to a better management of these crop pests
Renoirt, Matthias. "Influence de l’habitat sur l’écologie et la physiologie du crapaud épineux (Bufo spinosus)." Electronic Thesis or Diss., La Rochelle, 2022. http://www.theses.fr/2022LAROS041.
Повний текст джерелаA large number of studies have highlighted the negative effects of anthropogenic pressures intime and space on biodiversity. Among these anthropogenic pressures, agricultural activities and expansion play a major role in the modification of environments and in the loss of biodiversity. Questions whether animal species persist in this type of environment arises. My thesis is based on this context. We aimed at study the responses of organism to a degraded environment and the landscape constraints on life history traits and ecology. My work is focused specifically on an amphibian species persisting in habitat ranging from highly conserved to highly degraded by agricultural activities. In order to compare forest and agricultural populations of model species (Spined toad, Bufo spinosus), I relied on a wide variety of markers to examine (1) population genetic structure (micro-satellite markers), (2) feeding ecology (stable isotope), (3) individual quality (telomeres, morphology, developmental traits) and the impact on reproduction. As a result, I was able to connect many factors associated with agricultural landscapes that raised many questions about the persistence of spined toad populations. We were able to show a significant effect of fertilizers on the δ15N isotopic signature of B.spinosus populations. Moreover, we highlighted that agricultural environment allows genetic diversity between populations. However, using correlative approaches, we pointed out various on strains of this environment on the reproduction of amphibians populations, either through low (or no) abundance of females on breeding sites, and/or directly on reproductive success and offspring quality. These results suggest possible long-term effects on amphibian populations, and we suggest that the various avenues of research we suggested throughout this thesis should be pursued in order to better understand the mechanisms underlying these results and to find solutions for the sustainability of wild species that have no choice but to adapt
Fortin, Margot. "Influence de la bactérie féminisante Wolbachia sur le comportement de choix du partenaire et la fitness de son hôte Armadillidium vulgare." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2325/document.
Повний текст джерелаThis work investigates mate choice in the terrestrial isopod Armadillidium vulgare. This species is parasitized with intracellular bacteria Wolbachia, which is known to manipulate the sexuality of its hosts. In Armadillidium vulgare, Wolbachia lead to a feminization of genetic males, transforming them into functional females. The aim of this thesis was both to investigate how individuals choose their mates, and to understand the effect of Wolbachia on such choices. In order to answer these questions, we used a behavioural approach in order to compare the attractiveness and the behaviour of different kinds of females. The results indicate that males are able to accurately discriminate females with different life history traits or different degrees of relatedness. We also show that such discrimination from males toward females is correlated to females odour change, according to both their reproductive and infection status. The consequences of male mate choice were studied through reproduction experiment, and it seems that male’s preferences are linked to benefits in terms of reproductive success. Concerning females, a long-term monitoring in different sex-ratio conditions reveals that both males' presence and Wolbachia infections decrease their fitness, in particular their reproductive success, or even modify their social preferences
Whelan, Shannon. "The Role of Temperature in Timing of Reproduction and Reproductive Success of Gray Jays, Perisoreus canadensis." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35507.
Повний текст джерелаBründl, Aisha Colleen. "Investissement parental le long d'un gradient altitudinal chez la mésange bleue (Cyanistes caeruleus)." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30265/document.
Повний текст джерелаIn this thesis, I examine parental investment and fitness in the Eurasian blue tit (Cyanistes caeruleus) in the French Pyrenees and assess potential differences due to an altitudinal gradient that creates variation in environmental "harshness". I used observational and experimental data, collected from over 500 blue tit nests. Breeding conditions are "harsher" due to colder temperatures with increasing elevation. I found that increasing altitude leads to decreased hatching success. Nevertheless, clutch size and brood mortality is comparable across the gradient. I suggest that initial reproductive decisions such as timing and amount of offspring produced heavily shape the success of a reproductive attempt. These results have implications for understanding reproductive success
Lacoume, Sandrine. "Développement et succès reproducteur des mâles parasitoïdes, Dinarmus basalis, suite à des contraintes environnementales." Tours, 2007. http://www.theses.fr/2007TOUR4009.
Повний текст джерелаMales should protect their sperm stock and fertilization potential. The aim of this thesis is to investigate the effects of different environmental constraints on the reproductive success of males of the hymenoptera parasitoid, Dinarmus basalis. We have chosen a biotic factor (host resource) and an abiotic factor (a cold shock). Our results show that a cold choc on adult males does not affect their reproductive potential. However, a cold shock applied during development reduces males’ emergence but not developmental durations. Similar results are obtained with a dietary constraint applied during male development. This constraint affects also male phenotype by reducing both male and genital tract size. A stress applied during development reduces the quantity of sperm. In single mating, these constraints do not prevent male from mating. However, in repeated mating and male-male competition, constraints applied during development disadvantage males
Grange, Laura Joanne. "Reproductive success in Antarctic marine invertebrates." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/41355/.
Повний текст джерелаPellerin, Maryline. "Utilisation et sélection de l'habitat chez le chevreuil à différentes échelles spatio-temporelles." Poitiers, 2005. http://www.theses.fr/2005POIT2301.
Повний текст джерелаTallents, Lucy A. "Determinants of reproductive success in Ethiopian wolves." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442999.
Повний текст джерелаHardy, Danita Sue 1957. "Reproductive success of round-tailed ground squirrels." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276596.
Повний текст джерелаPelletier, Luc. "Facteurs affectant le succès reproducteur des bourdons en milieu naturel." Thesis, Université Laval, 2003. http://www.theses.ulaval.ca/2003/21026/21026.pdf.
Повний текст джерелаFactors that limit the reproductive success of bumblebee field colonies are poorly known. I explored the effect of the queen’s body size, food availability, and some parasites on reproductive success by following the development of more than 200 field colonies of eight species of bumblebees (Bombus impatiens, B. fervidus, B. perplexus, B. terricola, B. bimaculatus, B. ternarius, B. rufocinctus et B. vagans vagans). Larger queens were more likely to reproduce, and, for queens that did so, there was a positive relationship between their body size and the number of sexuals produced. The higher success of larger queens is, at least in part, attributable to the production of larger colonies and, in some species, to the ability to prevent usurpations by Psithyrus (a parasitic subgenus of bumblebees). The higher success of larger queens was not related to the date of nest establishment or to usurpations by other Bombus queens. A field experiment in which I added food to half of the colonies over the entire season showed that food availability was also an important factor. Colonies with increased food supplies reached larger sizes (in number of workers) and had a higher reproductive success than controls, by 51% and 86% respectively. In particular, food supplementation increased the number of males produced and the probability of producing gynes (young queens). However, despite some clear advantages of having larger food supplies such as the build-up of larger worker populations, food supplementation did not appear to help colonies defend themselves against macroparasites because experimental and control colonies experienced similar levels of parasitism by Psithyrus, Fannia canicularis, Brachicoma devia, and Vitula edmandsae. By recording the foraging activity rate in some of these colonies, I showed that food supplementation reduced the foraging activity rate per worker by 25% relative to control colonies. Workers from colonies with abundant food supplies thus appear to forage less on a daily basis to reduce foraging risks and costs. If workers benefit from an increased longevity by reducing their activity, this would provide an additional mechanism to explain the increased reproductive success of colonies with increased food supplies.
O'Donoghue, Paul. "Reproductive success and effective population size in ungulates." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528893.
Повний текст джерелаBanks, M. J. "Population dynamics and lifetime reproductive success of damselflies." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304819.
Повний текст джерелаDickerson, Bobette Ray. "Reproductive success in wild pink salmon, Oncorhynchus gorbuscha /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5337.
Повний текст джерелаButcher, Jerrod Anthony. "Minimum patch size thresholds of reproductive success of songbirds." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2842.
Повний текст джерелаPayne, Adam Gordon. "Male reproductive success in the beaugregory damselfish, Stegastes leucosticus." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400343.
Повний текст джерелаJones, M. Genevieve W. "Individual variation in reproductive success in the wandering Albatross." Doctoral thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11500.
Повний текст джерелаKieckbusch, Jens. "How do natural killer cells contribute to reproductive success?" Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708449.
Повний текст джерелаMcLean, Jennifer Elizabeth. "Reproductive success of hatchery and wild steelhead, Oncorhynchus mykiss /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5327.
Повний текст джерелаInoue, Eiji. "Male reproductive success and kin structure in primate societies." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136839.
Повний текст джерелаOrr, Harold Allen. "Social Factors Affecting Male Reproductive Success in Nasonia vitripennis." W&M ScholarWorks, 1985. https://scholarworks.wm.edu/etd/1539625295.
Повний текст джерелаRoyle, Nicholas John. "Reproductive decisions in the lesser black-backed gull Larus fuscus and their effects on reproductive success." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4688/.
Повний текст джерелаPatterson, Michael E. "Piping plover breeding biology and reproductive success on Assateague Island." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43276.
Повний текст джерелаMaster of Science
Lagrange, Paméla. "Déterminants de la survie et de la dispersion de reproduction par une approche Capture-Marquage-Recapture chez l’Hirondelle bicolore au Québec." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6855.
Повний текст джерелаAbstract : In North America, monoculture areas using high inputs of fertilizers and pesticides cover 85 % of agricultural lands, and as many pastures disappeared in the past 20 years to satisfy human food needs. These land-use changes have deeply transformed landscapes and altered the biodiversity of agro-ecosystems. Among farmland birds, aerial insectivores such as Tree Swallow, Tachycineta bicolor, studied here show a high rate of decline in their abundance, partly reflecting the degradation of agro-ecosystems where they breed. Biological mechanisms leading to the decline and dispersal patterns in migratory passerines are still poorly known. The present work quantifies the environmental effects on Tree Swallow individual traits (survival, reproductive success) and breeding dispersal (probability to disperse and occupation rates of breeding sites). Between 2004 and 2013, 2200 breeders and 8000 chicks were ringed and monitored during 10 breeding seasons on a study area composed of 40 sites and covering a mosaic of heterogeneous agricultural landscapes in southern Québec. The development of a new, flexible capture-mark-recapture model has reduced estimate bias of survival and dispersal probabilities of Tree Swallows. This approach allowed to assess the effect of several variables linked to habitat quality, public information and individual characteristics on dispersal, survival and reproductive success parameters of individuals. Within intensively cultivated landscapes associated to the presence of a nest site competitor, the House sparrow, Passer domesticus, male survival is up to 19 % lower. Females were affected by the cost of reproduction, especially in intensive landscapes where House sparrows and found and where food resources and nest site appear limited. Dispersal probability was not affected by environmental conditions either through the presence of House sparrows or habitat quality, and was restricted to 4 % in males. Females, which dispersed up to 14 times more than males, based their decision on their personal experience. Breeding failure increased up to 7 times the probability to disperse and for the first time in a short-lived species, I show that dispersal likelihood increased if the individual had dispersed in the previous year. These dispersal patterns were stable in time. Dispersal appeared as a costly process compared to site fidelity and was a minority phenotype in the population. It appeared an answer to unfavorable condition for reproduction. Finally, this work shows the use of public information (partners density, fledglings productivity the previous year) on the decision to settle on a site and this, after the dispersal decision had been initiated. The presence of House sparrows and the proportion of intensive areas near nest boxes were used as information to select a breeding site. Based on these findings, agricultural intensification likely plays a role in the decline of Tree swallow populations.
Gauthey, Zoé. "Effet de l’environnement sur l’évolution de la sélection sexuelle chez la truite commune (Salmo trutta)." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3049/document.
Повний текст джерелаAs a component of natural selection, sexual selection produces variation in reproductive success throughout the reproductive period, and therefore impacts genes transmission between generations. During this PhD, the effect of variation in hydraulic environment on sexual selection in brown trout was investigated at both within and between populations scales. New approaches to improve estimation of reproductive investment, as well as models to decompose the effect of traits on individual fitness at each stage of sexual selection, were developed. Experiments in natural and semi-natural environments indicate that environmental variation does not impact reproduction habitat choice by females, but it can modify reproductive investment in some populations, as well as it can control gene flow between genetically distinct populations. These results help to understand the evolution of sexual selection in the broad context of increasing stochastic variations of river systems hydrology as predicted by climate change models in temperate areas
Logie, John W. "Population ecology and lifetime reproductive success of dippers Cinclus cinclus." Thesis, University of Stirling, 1998. http://hdl.handle.net/1893/26684.
Повний текст джерелаJones, Kelly C. "Reproductive biology and nest success of cerulean warblers in Indiana." Virtual Press, 2006. http://liblink.bsu.edu/uhtbin/catkey/1339151.
Повний текст джерелаDepartment of Biology
Convey, Peter. "Influences on mating behaviour and reproductive success in the Odonata." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330166.
Повний текст джерелаGichuki, Nathaniel Ndegwa. "Factors affecting the reproductive success of the Grey Crowned Crane." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318098.
Повний текст джерелаJiang, Sanjie. "CMV infection affects bumblebee pollination behaviour and plant reproductive success." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/275637.
Повний текст джерелаPiggott, April. "REPRODUCTIVE SUCCESS IN HATCHERY-PRODUCED EASTERN OYSTER, CRASSOSTREA VIRGINICA (GMELIN)." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3503.
Повний текст джерелаSteinhart, Geoffrey B. "Exploring factors affecting smallmouth bass nest success and reproductive behavior." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1079982955.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains p.; also includes graphics. Includes abstract and vita. Co-advisors: Elizabeth A. Marschall and Roy A. Stein, Dept. of Evolution, Ecology, and Organismal Biology. Includes bibliographical references.
Lane, Sarah Marie. "The role of cuticular hydrocarbons in determining male reproductive success." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/20078.
Повний текст джерелаPanagakis, Andrea. "Le succès reproducteur au début de la vie, la longévité et le succès reproducteur tardif chez la femelle de la chèvre de montagne." Master's thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/26943.
Повний текст джерелаThe life-history theories of aging, which describe the mechanisms underlying age-related physiological declines, predict lifetime trade-offs between early reproductive allocation and latelife survival, reproduction, or both components of fitness. Recent studies in wild populations have found evidence for these early-late life trade-offs, but rarely across multiple traits while exploring the additional effects of variation in environmental conditions and individual quality. Benefiting from 27 years of longitudinal data from monitoring adult female mountain goats (Oreamnos americanus) at Caw Ridge, Alberta, we investigated the influence of age at first reproduction (AFR) and early reproductive success (ERS) on longevity and late reproductive success, while accounting for the influence of natal environmental conditions and individual quality. Contrary to our predictions, we did not find evidence for early-late life trade-offs in this population. AFR and ERS instead had positive but weak direct effects on late reproductive success. Population density in the year of a female's birth strongly reduced late reproductive success both directly and indirectly through AFR and ERS. The sole determinant of female longevity was the direct, negative effect of density. As predicted by previous studies in this population, high-quality females had a higher ERS compared to low-quality females. The results of this investigation provide an integrated picture of early-late life trade-offs, underscoring the importance of accounting for environmental conditions due to their potentially strong implications for population dynamics.
Rooney, Jennifer. "Male reproductive investment in two fireflies, Photinus ignitus and Ellychnia corrusca : effects on male and female reproductive success /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2000.
Знайти повний текст джерелаAdviser: Sara M. Lewis. Submitted to the Dept. of Biology. Includes bibliographical references (leaves 100-107). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
Lagrange, Paméla. "Déterminants de la survie et de la dispersion de reproduction par une approche capture-marquage-recapture chez l'Hirondelle bicolore au Québec." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS077/document.
Повний текст джерелаIn North America, monoculture areas using high inputs of fertilizers and pesticides cover 85% of agricultural lands, and as many pastures disappeared in the past 20 years to satisfy human food needs. These land-use changes have deeply transformed landscapes and altered the biodiversity of agro-ecosystems. Among farmland birds, aerial insectivores such as Tree swallow, Tachycineta bicolor, studied here show a high rate of decline in their abundance, partly reflecting the degradation of agro-ecosystems where they breed. Biological mechanisms leading to the decline and dispersal patterns in migratory passerines are still poorly known. The present work quantifies the environmental effects on Tree swallow individual traits (survival, reproductive success) and breeding dispersal (probability to disperse and occupation rates of breeding sites). Between 2004 and 2013, 2200 breeders and 8000 chicks were ringed and monitored during 10 breeding seasons on a study area composed of 40 sites and covering a mosaic of heterogeneous agricultural landscapes in southern Québec. The development of a new, flexible capture-mark-recapture model has reduced estimate bias of survival and dispersal probabilities of Tree swallows. This approach allowed to assess the effect of several variables linked to habitat quality, public information and individual characteristics on dispersal, survival and reproductive success parameters of individuals. Within intensively cultivated landscapes associated to the presence of a nest site competitor, the House sparrow, Passer domesticus, male survival is up to 19% lower. Females are affected by the cost of reproduction, especially in intensive landscapes where House sparrows and found and where food resources and nest site appear limited. Dispersal probability is not affected by environmental conditions either through the presence of House sparrows or habitat quality, and is restricted to 4% in males. Females, which disperse up to 14 times more than males, base their decision on their personal experience. Breeding failure increases up to 7 times the probability to disperse and for the first time in a short-lived species, I show that dispersal likelihood increases if the individual has dispersed in the previous year. These dispersal patterns are stable in time. Dispersal appears as a costly process compared to site fidelity and is a minority phenotype in the population. It appears an answer to unfavorable condition for reproduction. Finally, this work shows the use of public information (partners density, fledglings productivity the previous year) on the decision to settle on a site and this, after the dispersal decision has been initiated. The presence of House sparrows and the proportion of intensive areas near nestboxes are used as information to select a breeding site. Based on my findings, agricultural intensification likely plays a role in the decline of Tree swallow populations
Celis, Patricia. "Reproductive success and male traits in the spotless starling, Sturnus unicolor." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/722.
Повний текст джерелаLord, Alexa. "Environmental Components of Reproductive Success in the Blue tit, Parus caeruleus." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486417.
Повний текст джерелаRakitin, Ana. "Body size and reproductive success in Atlantic cod, Gadus morhua L." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0007/NQ43270.pdf.
Повний текст джерелаRise, Marlies. "The role of prezygotic events in the reproductive success of conifers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ62525.pdf.
Повний текст джерелаDurocher-Granger, Léna. "The effects of phenotypic plasticity on reproductive success of Trichogramma euproctidis." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104821.
Повний текст джерелаLes parasitoïdes démontrent une variation dans leurs tailles corporelles lorsqu'ils sont contraints par la quantité de ressources contenue dans l'hôte. La plasticité phénotypique des caractères reproducteurs du parasitoïde des œufs Trichogramma euproctidis ainsi que son impact sur le succès de reproduction en contexte de compétition ont été étudiés. Cette espèce a été choisie pour cette étude parce que différents aspects des stratégies de reproduction des mâles et des femelles sont bien connus.Une plasticité phénotypique des caractères reproducteurs a été observée pour T. euproctidis. Les résultats ont montré que la longueur des spermatozoïdes, et le volume et le nombre d'oocytes augmentent avec la taille corporelle. Un indice d'investissement maternel a été calculé pour déterminer l'effort investi en reproduction en lien avec la taille corporelle des femelles et suggère que les femelles de grandes tailles investissent plus de ressources en reproduction. Dans cette étude, la plasticité des caractères reproducteurs chez T. euproctidis est une conséquence d'une contrainte environnementale de disponibilité de la nourriture, suggérant que l'acquisition des ressources pendant le stade larvaire est un facteur déterminant de la valeur adaptative.En contexte de compétition spermatique, les petits spermatozoïdes ont fertilisé les œufs plus tôt dans la vie des femelles que les longs spermatozoïdes, mais seulement lorsque les petits spermatozoïdes étaient en infériorité numérique indiquant qu'ils peuvent compenser en étant plus compétitifs. Le volume des oocytes n'a pas influencé les résultats de la compétition larvaire, cependant la progéniture de la deuxième femelle qui pond a été avantagée sur la première, suggérant un comportement d'ovicide de la deuxième femelle.
Woodroffe, Rosemary Brigitte. "Factors affecting reproductive success in the European badger, Meles meles L." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316891.
Повний текст джерелаArundell, Katherine Louise. "Sex and success : factors influencing survival and reproduction in amphipod crustaceans." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.634200.
Повний текст джерелаRose, Karen Elizabeth. "Factors affecting lifetime reproductive success in red deer stags (Cervus elaphus)." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388484.
Повний текст джерелаLautenbach, Joseph Mark. "Lesser prairie-chicken reproductive success, habitat selection, and response to trees." Thesis, Kansas State University, 2014. http://hdl.handle.net/2097/18810.
Повний текст джерелаDepartment of Biology
David A. Haukos
The lesser prairie-chicken (Tympanuchus pallidicinctus) is a species of prairie grouse native to the southwest Great Plains. Population declines and threats to populations of lesser prairie-chickens led U.S. Fish and Wildlife Service to list the species as “threatened” under the protection of the Endangered Species Act in May 2014. Lesser prairie-chickens are found within three distinct ecoregions of Kansas and Colorado and portions of the species’ range are affected by tree encroachment into grasslands. The effect of trees on lesser prairie-chickens is poorly understood. I evaluated habitat selection and reproductive success and across the northern portion of the species’ range. I captured female lesser prairie-chickens within the three different ecoregions in Kansas and Colorado to track nest and brood survival and measure nest and brood habitat. My findings show that there are regional and annual variations in nest and brood survival. Mean nest survival during 2013 and 2014 was estimated to be 0.388 (95% CI = 0.343 – 0.433) for a 35-day exposure period. Brood survival during 2013 and 2014 was estimated to be 0.316 (95% CI = 0.184 – 0.457) for 56 days. Chick survival was the lowest during the first week of life and is probably a limiting factor for population growth. Chick and brood survival decreased as Julian hatch date increased. Across the northern portion of the species’ range, females consistently select visual obstruction between 2-3 dm. Vegetation at the nest changes between regions and years to reflect environmental and regional conditions. Broods consistently selected habitats with greater percent cover of forbs than was expected at random across all study sites. Broods also selected against areas of bare ground. The threshold of lesser prairie-chicken use was 2 trees/ha throughout the year. No nests were located within areas with greater densities. Lesser prairie-chickens had a greater probability of use at greater distances from trees and at lower tree densities. To provide adequate nesting habitat managers should provide 2-3 dm of visual obstruction. Providing forb cover with visual obstruction between 2.5-5 dm near nesting habitat should provide adequate habitat for broods. Removing trees in core habitats and expand removal efforts outward should expand potential habitat for lesser prairie-chickens.
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Повний текст джерелаShortlidge, Erin Elizabeth. "Testing the Ecological and Physiological Factors Influencing Reproductive Success in Mosses." PDXScholar, 2014. http://pdxscholar.library.pdx.edu/open_access_etds/1951.
Повний текст джерелаKilduff, Ian Andrew. "Mate choice and reproductive success in the speckled bushcricket, Leptophyes punctatissima." Thesis, Open University, 2000. http://oro.open.ac.uk/54186/.
Повний текст джерелаPerkins, Jordan Carol. "Reproductive Success and Evaluation of Management Strategies for Least Terns in Maine." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/PerkinsJC2004.pdf.
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