Scott R. Powell

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Low-density rural home development is the fastest-growing form of land use in the United States since 1950. This ‘‘exurban’’ development (;6–25 homes/km2) includes urban fringe development (UFD) on the periphery of cities and rural residential development (RRD) in rural areas attractive in natural amenities. This paper synthesizes current knowledge on the(More)
Correlation between gut microbiota and host phylogeny could reflect codiversification over shared evolutionary history or a selective environment that is more similar in related hosts. These alternatives imply substantial differences in the relationship between host and symbiont, but can they be distinguished based on patterns in the community data(More)
1. Arboreal ants are both diverse and ecologically dominant in the tropics. Such ecologically important groups are likely to be particularly useful in ongoing empirical efforts to understand the processes that regulate species diversity and coexistence. 2. Our study addresses how access to tree-based resources and the diversity of pre-existing nesting(More)
A new realt ime IIR filter s t ruc tu re is p resented tha t possesses exact phase l inear i ty with 10 1000 t imes fewer general multiplies t han conventional FIR filters of s imilar performance a n d bet ter magni tude character is t ics t han equir ipple o r maximally flat g r o u p delay IIR filters. This s t ruc tu re is based on a novel technique(More)
Many insects and arthropods live in colonies or aggregations of varying size. Group size may affect collective organization either because the same individual behavior has different consequences when displayed in a larger group or because larger groups are subject to different constraints and selection pressures than smaller groups. In eusocial colonies,(More)
Intracolonial conflict among ant workers can establish a reproductive hierarchy, with top-ranking individuals often securing oviposition opportunities. Here we show that in the ant Odontomachus brunneus, reproduction-based dominance interactions control worker movement and location, and that this, in turn, mechanistically governs task allocation within the(More)
  • S Powell
  • Journal of evolutionary biology
  • 2009
Caste evolution is a central process in the adaptive diversification of insect superorganisms. Nevertheless, how ecology shapes adaptive caste evolution remains poorly understood. Recent work with the ant genus Cephalotes has provided new comparative evidence that ecological specialization may drive adaptive caste specialization. Here, three key predictions(More)
In a recent study, Denny et al. (2004a) showed that queens of the army ant, Eciton burchellii, mate with multiple males and presented estimates suggesting that they mate with more males than queens of any other ant species so far investigated. They also inferred that data were consistent with queens being inseminated repeatedly throughout their life, which(More)
Most species of social insects have singly mated queens, although there are notable exceptions. Competing hypotheses have been proposed to explain the evolution of high levels of multiple mating, but this issue is far from resolved. Here we use microsatellites to investigate mating frequency in the army ant Eciton burchellii and show that queens mate with(More)
1. The New World army ants are top predators in the litter of tropical forest, but no comprehensive studies exist on variation in assemblage-wide activity and species composition. We used standardized protocols to estimate foraging raid rates and species composition of army ant communities in four Neotropical forests. The study sites spanned approximately(More)