909 resultados para Behavioural problems in classrooms


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This research has been funded by the Galician Ministry of Education (Secrctaria Xeral de lnvestigación-PGIDT00PXI20407PR).

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N.B. reproduced with permission of Peter Lang Verlag. For citation, please, use the original reference, that is Campos Pardillos, M.A. and Balteiro Fernández, I. 2009. “Building bridges… and properties aplenty: cultural problems in Spanish real estate marketing for prospective British buyers”. In: Guillén-Nieto, V., C. Marimón-Llorca and C. Vargas-Sierra. Eds. Intercultural Business Communication and Simulation and Gaming Methodology. Bern: Peter Lang. Pp. 155-174.

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The literature on niche separation and coexistence between species is large, but there is widespread variation in behavioural strategy between individuals of the same species that has received much less attention. Understanding what maintains this diversity is important because intraspecific behavioural diversity can affect population dynamics and community interactions. Multiple behavioural strategies can arise either as phenotype-dependent ‘conditional strategies’, where phenotypic variation causes individuals to adopt different strategies for optimizing fitness, or as internally-independent ‘alternative strategies’, where multiple fitness peaks exist for individuals and strategic ‘choice’ remains plastic. Though intraspecific variation in stable phenotypes is known to maintain intraspecific behavioural diversity through conditional strategies, when internal conditions are highly plastic or reversible, it is not clear whether individual behaviours are maintained as conditional strategies, or as alternative strategies of equal fitness. In this study, I combine an observational and experimental approach to identify the likely mechanisms maintaining behavioural diversity between hemoglobin-rich and hemoglobin-poor morphs in a natural population of Daphnia pulicaria. In Round Lake, individuals with low hemoglobin migrate daily from the hypolimnion to the epilimnion, whereas individuals with high hemoglobin remain in the hypolimnion. Using high-resolution depth and time sampling, I discovered behavioural diversity both within and among hemoglobin phenotypes. I tested the role of hemoglobin phenotype in maintaining behavioural diversity using automated migration robots that move individuals across the natural environmental gradients in the lake. By measuring the fitness of each morph undergoing either a natural migration behaviour, or the migration of the opposite morph, I found that the fitness of hemoglobin rich and poor morphs in their natural behaviour does not differ, but that Hb-rich individuals can obtain equal fitness from either behaviour, while Hb-poor morphs suffer substantial drops in survivorship in the alternate migration behaviour. Thus, migration behaviour in this system exists as a conditional strategy for some individuals, and as alternative strategies of equal fitness for others. The results of this study suggest that individual limits in the expression of highly flexible internal conditions can reinforce intraspecific behavioural diversity. Few studies have measured the fitness consequences of switching migration strategies and this study provides a rare example in the field.

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Belarus’s financial condition has visibly worsened since the beginning of this year. The severe falls in the country’s foreign currency reserves and its shortage of foreign currency on the international market pose an increasing threat to the stability of the Belarusian economy. Fearing an outbreak of public dissatisfaction, The government has so far been trying to avoid devaluing the rouble or structural economic reforms. Maintaining full control inside the country and the stability of the authoritarian regime are still the main concerns for President Alyaksandr Lukashenka. For this reason, the actions taken by the Belarusian government have been limited to imposing short-term administrative restrictions on the foreign currency market and obtaining external support in the form of loans. Given Belarus’s falling creditworthiness, Minsk is only able to ask Russia for financial support, thus offering the Kremlin more opportunities to realise its desire to take over strategic industrial plants in Belarus. However, the present economic problems of Belarus are so serious that no loan will be able to safeguard its government from the need of carrying out serious economic reforms.