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Choice Strategies (choice + strategy)
Selected AbstractsChoice strategies in Drosophila are based on competition between olfactory memoriesEUROPEAN JOURNAL OF NEUROSCIENCE, Issue 4 2009Yan Yin No abstract is available for this article. [source] Informed dispersal, heterogeneity in animal dispersal syndromes and the dynamics of spatially structured populationsECOLOGY LETTERS, Issue 3 2009Jean Clobert Abstract There is accumulating evidence that individuals leave their natal area and select a breeding habitat non-randomly by relying upon information about their natal and future breeding environments. This variation in dispersal is not only based on external information (condition dependence) but also depends upon the internal state of individuals (phenotype dependence). As a consequence, not all dispersers are of the same quality or search for the same habitats. In addition, the individual's state is characterized by morphological, physiological or behavioural attributes that might themselves serve as a cue altering the habitat choice of conspecifics. These combined effects of internal and external information have the potential to generate complex movement patterns and could influence population dynamics and colonization processes. Here, we highlight three particular processes that link condition-dependent dispersal, phenotype-dependent dispersal and habitat choice strategies: (1) the relationship between the cause of departure and the dispersers' phenotype; (2) the relationship between the cause of departure and the settlement behaviour and (3) the concept of informed dispersal, where individuals gather and transfer information before and during their movements through the landscape. We review the empirical evidence for these processes with a special emphasis on vertebrate and arthropod model systems, and present case studies that have quantified the impacts of these processes on spatially structured population dynamics. We also discuss recent literature providing strong evidence that individual variation in dispersal has an important impact on both reinforcement and colonization success and therefore must be taken into account when predicting ecological responses to global warming and habitat fragmentation. [source] SEXUALLY TRANSMITTED DISEASE AND THE EVOLUTION OF MATING SYSTEMSEVOLUTION, Issue 6 2002Hanna Kokko Abstract ., Sexually transmitted diseases (STDs) have been shown to increase the costs of multiple mating and therefore favor relatively monogamous mating strategies. We examine another way in which STDs can influence mating systems in species in which female choice is important. Because more popular males are more likely to become infected, STDs can counteract any selective pressure that generates strong mating skews. We build two models to investigate female mate choice when the sexual behavior of females determines the prevalence of infection in the population. The first model has no explicit social structure. The second model considers the spatial distribution of matings under social monogamy, when females mated to unattractive males seek extrapair fertilizations from attractive males. In both cases, the STD has the potential to drastically reduce the mating skew. However, this reduction does not always happen. If the per contact transmission probability is low, the disease dies out and is of no consequence. In contrast, if the transmission probability is very high, males are likely to be infected regardless of their attractiveness, and mating with the most attractive males imposes again no extra cost for the female. We also show that optimal female responses to the risk of STDs can buffer the prevalence of infection to remain constant, or even decrease, with increasing per contact transmission probabilities. In all cases considered, the feedback between mate choice strategies and STD prevalence creates frequency-dependent fitness benefits for the two alternative female phenotypes considered (choosy vs. randomly mating females or faithful vs. unfaithful females). This maintains mixed evolutionarily stable strategies or polymorphisms in female behavior. In this way, a sexually transmitted disease can stabilize the populationwide proportion of females that mate with the most attractive males or that seek extrapair copulations. [source] Consumers' everyday food choice strategies in FinlandINTERNATIONAL JOURNAL OF CONSUMER STUDIES, Issue 4 2006Katja Järvelä Abstract In developed countries, choosing and purchasing food is today perhaps more complex than ever. In recent years, European consumers have experienced several food crises. We face a rapidly expanding range of novel food products, the food chain has become longer, and the origin of food more anonymous. At the same time, consumers confront increasing amounts of information on food every day. Consumers build their conceptions of modern food-related risks on the basis of their everyday knowledge and coping strategies. Hence, the focus of this paper is on consumers' food choices and everyday practices in relation to food safety and quality as well as food-related risks. The paper is based on a Finnish study1 examining consumers' food choices. The data for the study were collected in September 2004 using an Internet-based food diary accompanied by open-ended questions on food-related views and strategies. Altogether, 92 consumers completed the diary. The method combining the tradition of dietary intake and food consumption surveys with open-ended questions was developed in order to gain an insight both on the types of foods purchased and on consumers' conceptions of food-related issues. In this paper, we focus on the key findings of the study as regards to consumers' notions on food quality and safety issues and the practices they use in their everyday lives. We found eight everyday strategies consumers use. We suggest, first, that the strategies are important in simplifying food choice and making daily life easier, and second, that consumers use food-related information flexibly in creating these strategies. [source] Does the mode of transmission between hosts affect the host choice strategies of parasites?OIKOS, Issue 2 2009Implications from a field study on bat fly, wing mite infestation of Bechstein's bats In a two-year field study, we analyzed the distribution of two hematophagous ectoparasites, the bat fly Basilia nana and the wing mite Spinturnix bechsteini, within and among 14 female colonies and among 26 solitary male Bechstein's bats Myotis bechsteinii. Our goal was to investigate whether differences in the transmission mode of the parasites, which result from differences in their life cycle, affect their distribution between host colonies and among host individuals within colonies. Bat flies deposit puparia in bat roosts, allowing for the transmission of hatched flies via successively shared roosts, independent of body contact between hosts or of hosts occupying a roost at the same time. In contrast, wing mites stay on the bat's body and are transmitted exclusively by contact of bats that roost together. As expected in cases of higher inter-colony transmissibility, bat flies were more prevalent among the demographically isolated Bechstein's bat colonies and among solitary male bats, as compared to wing mites. Moreover, the prevalence and density of wing mites, but not of bat flies, was positively correlated with colony size, as expected in cases of low inter-colony transmissibility. Within colonies, bat flies showed higher abundance on host individuals in good body condition, which are likely to have high nutritional status and strong immunity. Wing mites showed higher abundance on hosts in medium body condition and on reproductive females and juveniles, which are likely to have relatively weak immunity. We suggest that the observed infestation patterns within host colonies reflect different host choice strategies of bat flies and wing mites, which may result from differences in their inter-colony transmissibility. Our data also indicate that infestation with wing mites, but not with bat flies, might be a cost of sociality in Bechstein's bats. [source] The relationship between indecisiveness and eye movement patterns in a decision making informational search taskJOURNAL OF BEHAVIORAL DECISION MAKING, Issue 4 2010Andrea L. Patalano Abstract Indecisiveness is a trait-related general tendency to experience decision difficulties across a variety of situations, leading to decision delay, worry, and regret. Indecisiveness is proposed (Rassin, 2007) to be associated with an increase in desire for information acquisition and reliance on compensatory strategies,as evidenced by alternative-based information search,during decision making. However existing studies provide conflicting findings. We conducted an information board study of indecisiveness, using eye tracking methodology, to test the hypotheses that the relationship between indecisiveness and choice strategy depends on being in the early stage of the decision making process, and that it depends on being in the presence of an opportunity to delay choice. We found strong evidence for the first hypothesis in that indecisive individuals changed shift behavior from the first to the second half of the task, consistent with a move from greater to lesser compensatory processing, while the shift behavior of decisive individuals suggested lesser compensatory processing over the whole task. Indecisiveness was also related to time spent viewing attributes of the selected course, and to time spent looking away from decision information. These findings resolve past discrepancies, suggest an interesting account of how the decision process unfolds for indecisive versus decisive individuals, and contribute to a better understanding of this tendency. Copyright © 2009 John Wiley & Sons, Ltd. [source] | |||||||||||||