37 resultados para antelope


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Issued also as Environmental protection technology series ; EPA-600/2-76-022. Grant no. 17080 GCI, Grant no. WRD 97-01-68. Program element no. 1BB043-ROAP21ASB-Task 008. Final report 1967-1973.

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Natural selection generally operates at the level of the individual, or more specifically at the level of the gene. As a result, individual selection does not always favour traits which benefit the population or species as a whole. The spread of an individual gene may even act to the detriment of the organism in which it finds. Thus selection at the level of the individual can affect processes at the level of the organism, group or even at the level of the species. As most behaviours ultimately affect births, deaths and the distribution of individuals, it seems inevitable that behavioural decisions will have an impact on population dynamics and population densities. Behavioural decisions can often involve costs through allocation of energy into behavioural strategies, such as the investment into armaments involved in fighting over resources or increased mortality due to injury or increased predation risk. Similarly, behaviour may act o to benefit the population, in terms of higher survival and increased fecundity. Examples include increased investment through parental care, choosing a mate based on the nuptial gifts they may supply and choosing territories in the face of competition. Investigating the impact of behaviour on population ecology may seem like a trivial task, but it is likely to have important consequences at different levels. For example, antagonistic behaviour may occasionally become so extreme that it increases the risk of extinction, and such extinction risk may have important implications for conservation. As a corollary, any such behaviour may also act as a macroevolutionary force, weeding out populations with traits which, whilst beneficial to the individuals in the short term, ultimately result in population extinction. In this thesis, I examine how behaviours, specifically conflict and competition over a resource and aspects of behaviour involved in sexual selection, can affect population densities, and what the implications are for the evolution and ecology of the populations in question. It is found that both behaviours related to individual conflict and mating strategies can have an effect at the level of the population, but that various factors, such as a feedback between selection and population densities or macroevolution caused by species extinctions, may act to limit the intensity of conflicts that we observe in nature.

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The paper focuses on an emergent Tepic: the new role of territorios in the worldwide competente pushed by globalization. Each and everyone territory seeks the same result: attract capital, innovations, turism and, at the same time, sell its goods and services worldwide. As an old African proverb states: “in the African plain no matter what you are, lion or antelope, you better start running from the eve to avoid dying, either from starving or in the gullet of a depredator”. In Latin America the importance granted to territorial marketing is scarce bur growing. It is necessary to apply to territories the prescriptions that Aristóteles wrote on rethorics, the art of delivering a discourse. These rules are based on ethos (the essential characteristics of who speaks), on pathos (the emocional appeal contained in the speech) and on logos (the reason or rationality). Text is structured in four sections: a) Introduction, a description of the problem to be discussed including a revision of the concept of globalization making clear its systemic nature and its most likely result: a unique commercial space and multiple production spaces; b) Competence and territorial marketing, discussing the main theoretical issues involved; c) Chilean experience on territorial marketing; d) Final comments.