Phylogenetic

analysis of ITS1-5.8S-ITS2 sequences yielded two Tulasnella clades. In four cases, selleck chemical plants were found to be associated with both clades. The difference between univariate and bivariate K functions was consistent with the random labeling null model at all spatial scales, indicating that trees hosting clades A and B of Tulasnella are not spatially segregated. The analysis of the inhomogenous K function showed that host trees are not clustered, suggesting no limitations to population-scale dispersal. chi(2) analysis of contingency tables showed that E. rhopalostele is more frequent on dead trees than expected.\n\nConclusions: Epidendrum rhopalostele establishes mycorrhizal associations with at least two different Tulasnella species. The analysis of the distribution patterns of this orchid suggests a microsite preference for dead trees and no seed dispersal limitation.”
“We examined how differences in activity among individual foragers

of the red harvester ant, Pogonomyrmex selleck inhibitor barbatus, could arise from site fidelity. Using observations of individually marked foragers, we found that each day most foragers made a few foraging trips, whereas only a few foragers made many trips. To determine whether only particular individuals are capable of high foraging activity, we removed the foragers that made the most foraging trips on 1 day and examined the frequency distribution of foraging the subsequent day. The most active foragers were replaced by other individuals. We then examined site fidelity of foragers. Though foraging trails extend up to 20 m from the nest, ABT-263 ic50 observations of marked individuals showed that on successive trips, a forager returns to sites within about 0.5 m. Foraging trip duration depended on search time and not on the distance from the nest of the final destination. Thus, the more food available, the shorter the search time and the shorter the trip. Because foragers return to the same site over and over within a

day, a forager making many short trips to a high-quality patch can make more foraging trips per day. Thus, variation in patch quality, rather than individual variation in foraging ability, could produce the observed distribution of trip number. These results show that regulation of foraging in harvester ants does not require any individuals to show others a particular location with abundant food. Instead, a decentralized system of interactions tunes the numbers foraging to current food availability.”
“Objective. To analyse the effect of a 24-week physical training programme in water and on land on women with fibromyalgia. Methods. A controlled study was conducted from December 2009 to May 2010. Seventy-two women with fibromyalgia (age: 51.79 +/- 7.87 years) were assigned to an exercise group (3 sessions/week, 2 sessions in water, I session on land) (n=42) and to a control group (n=30).