829 resultados para habitat destruction
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Senior thesis written for Oceanography 445
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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 25 de Março de 2013, Universidade dos Açores.
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Tese de Doutoramento, Ciências do Mar (Biologia Marinha)
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Tese de Doutoramento, Ciências do Mar (especialidade em Ecologia Marinha), 11 de Setembro de 2015, Universidade dos Açores.
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One of the major factors threatening chimpanzees (Pan troglodytes verus) in Guinea-Bissau is habitat fragmentation. Such fragmentation may cause changes in symbiont dynamics resulting in increased susceptibility to infection, changes in host specificity and virulence. We monitored gastrointestinal symbiotic fauna of three chimpanzee subpopulations living within Cantanhez National Park (CNP) in Guinea Bissau in the areas with different levels of anthropogenic fragmentation. Using standard coproscopical methods (merthiolate-iodine formalin concentration and Sheather's flotation) we examined 102 fecal samples and identified at least 13 different symbiotic genera (Troglodytella abrassarti, Troglocorys cava, Blastocystis spp., Entamoeba spp., Iodamoeba butschlii, Giardia intestinalis, Chilomastix mesnili, Bertiella sp., Probstmayria gombensis, unidentified strongylids, Strongyloides stercoralis, Strongyloides fuelleborni, and Trichuris sp.). The symbiotic fauna of the CNP chimpanzees is comparable to that reported for other wild chimpanzee populations, although CNP chimpanzees have a higher prevalence of Trichuris sp. Symbiont richness was higher in chimpanzee subpopulations living in fragmented forests compared to the community inhabiting continuous forest area. We reported significantly higher prevalence of G. intestinalis in chimpanzees from fragmented areas, which could be attributed to increased contact with humans and livestock.
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The genetic diversity of populations, which contributes greatly to their adaptive potential, is negatively affected by anthropogenic habitat fragmentation and destruction. However, continental-scale losses of genetic diversity also resulted from the population expansions that followed the end of the last glaciation, an element that is rarely considered in a conservation context. We addressed this issue in a meta-analysis in which we compared the spatial patterns of vulnerability of 18 widespread European amphibians in light of phylogeographic histories (glacial refugia and postglacial routes) and anthropogenic disturbances. Conservation statuses significantly worsened with distances from refugia, particularly in the context of industrial agriculture; human population density also had a negative effect. These findings suggest that features associated with the loss of genetic diversity in post-glacial amphibian populations (such as enhanced fixation load or depressed adaptive potential) may increase their susceptibility to current threats (e.g., habitat fragmentation and pesticide use). We propose that the phylogeographic status of populations (i.e., refugial vs. post-glacial) should be considered in conservation assessments for regional and national red lists.
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Début : « Combien que tous les jours les anciennes choses communément soient mises en oubli... » — Fin : « ... Le roy Protheronor, le roy Optemene. » — Miniatures.
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Commençant par : « Comment le roy Ninus porta premièrement armes. Devant ce que Romme fust fondée... » et finissant par : « ... A cestui commancerent les hystoires des Rommains et de ceulx qui fonderent Romme ; mais rien diray ores plus. Deo gratias. » Miniatures. Blason vraisemblablement de la famille de Breseillac en Bretagne.
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Commençant par : « Devant ce que Romme fust fondée... » et finissant par : «... mais n'en parleray ne ne diray plus pour le present » .
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Commençant par : « Et commance le roy Priam : O deesses et dieux Parfaiz et glorieux... » et finissant par : « Affin que vostre compagnie Puisse partir sans arrester » . Ce ms. ne contient que la première journée et le début de la seconde.
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Ce titre est d'une main du XVIIe siècle. Commencement du texte (fol. 1) : « C'est chose tres profitable, et qui aux roys et princes de France doit estre moult delectable, de savoir et congnoistre les haults et vertueux faiz de leurs tres nobles predecesseurs... ». Fin (fol. 49) : «... Toutes ces choses dessusdictes sont plus au long mises et enregistrées aux croniques dudit Charles septiesme, père dudit seigneur Loys, à present roy de France ». A la suite sont quelques titres de chapitres : « La nativité de Loys, unziesme de ce nom, à present roy de France... ».