The Reproductive and Conservation Biology of the spotted towhee in Urban Forest Fragments

I studied the demography, reproductive biology, and mating behavior of Spotted Towhees (Pipilo maculatus) in four urban parks in relation to park area, the presence of recreational trails, and the effects of habitat edges. Despite high towhee abundance in the parks, two of the four are population sinks with levels of yearly reproductive productivity that do not offset adult survival. The other two parks have sufficient reproduction to adequately result in stable or growing population sizes. Park area and the proportion of habitat edge had no influence on population growth rate, reproductive productivity, or survival. However, trail density was negatively related to population growth rate, and this appears to be due to the negative effects of trail density on adult survival. Experienced females who nested near recreational trails exhibited high nest success, and while there was no such relationship between nest success and a nest\u27s distance from habitat edge, nests near edges fledged significantly more offspring, were less likely to suffer partial brood losses, and nestlings near edges bordering residential areas were significantly heavier than those in the park interior. This suggests that urban habitat edges, particularly those bordering residential areas where anthropogenic food sources like bird feeders are present, may provide abundant food resources for species that are able to utilize these sources, and these supplemental foods may improve the overall reproductive output for individuals nesting nearby. Consistent with previous results that edges provide supplemental food for urban towhees, I found that female condition was negatively correlated with distance to habitat edge. The probability of extra-pair paternity (EPP) was highest both near habitat edges and in the park interior, but the proportion of extra-pair young (EPY) in the nests of females who engaged in this activity showed the opposite pattern: broods at intermediate distances from edges had the highest proportion of EPY. Communal food resources near habitat edges may create opportunities for chance extra-pair mating encounters, but females in food-poor interior habitats may engage in EPP more regularly as they leave their territory in search of food resources

Fecal-Sac Ingestion by Spotted Towhees

Altricial nestlings encase excrement in fecal sacs that parents remove by either ingesting them or transporting them away from the nest. Ingestion may allow energetically or nutritionally deprived parents to recapture energy or nutrients that might be lost because of nestlings\u27 inefficient digestion (the parental-nutrition hypothesis ), but ingestion may also permit parents to avoid flights from the nest that interfere with parental care (e.g., brooding young; the economic-disposal hypothesis ). We used a hypothetico-deductive approach to test the two hypotheses\u27 ability to account for fecal-sac ingestion by the Spotted Towhee (Pipilo maculatus). We confirmed the parental-nutrition hypothesis\u27 predictions that more fecal sacs should be ingested in years of food shortage (males only), late in the season when food supplies decline (both sexes), by parents that had the greatest difficulty raising young (i.e., underweight young), and that adults\u27 body condition should vary directly with their rate of fecal-sac ingestion (females only). We rejected the economic-disposal hypothesis\u27 prediction of a decline in fecal-sac ingestion with increasing brood size. The latter, plus the observation that nearly 40% of males ingest fecal sacs despite their spending virtually no time attending nests, suggests that fecal-sac ingestion is not a mechanism to avoid needless and time-consuming flights from the nest that interfere with parental care. Fecal-sac ingestion by Spotted Towhees is better interpreted as either a resource supplement to parents or as a mechanism to satiate hunger so that parents can maintain rates of feeding to dependent young

A many-analysts approach to the relation between religiosity and well-being

The relation between religiosity and well-being is one of the most researched topics in the psychology of religion, yet the directionality and robustness of the effect remains debated. Here, we adopted a many-analysts approach to assess the robustness of this relation based on a new cross-cultural dataset (N = 10, 535 participants from 24 countries). We recruited 120 analysis teams to investigate (1) whether religious people self-report higher well-being, and (2) whether the relation between religiosity and self-reported well-being depends on perceived cultural norms of religion (i.e., whether it is considered normal and desirable to be religious in a given country). In a two-stage procedure, the teams first created an analysis plan and then executed their planned analysis on the data. For the first research question, all but 3 teams reported positive effect sizes with credible/confidence intervals excluding zero (median reported beta = 0.120). For the second research question, this was the case for 65% of the teams (median reported beta = 0.039). While most teams applied (multilevel) linear regression models, there was considerable variability in the choice of items used to construct the independent variables, the dependent variable, and the included covariates.</p

The Surface Array planned for IceCube-Gen2

IceCube-Gen2, the extension of the IceCube Neutrino Observatory, will feature three main components: an optical array in the deep ice, a large-scale radio array in the shallow ice and firn, and a surface detector above the optical array. Thus, IceCube-Gen2 will not only be an excellent detector for PeV neutrinos, but also constitutes a unique setup for the measurement of cosmic-ray air showers, where the electromagnetic component and low-energy muons are measured at the surface and high-energy muons are measured in the ice. As for ongoing enhancement of IceCube’s current surface array, IceTop, we foresee a combination of elevated scintillation and radio detectors for the Gen2 surface array, aiming at high measurement accuracy for air showers. The science goals are manifold: The in-situ measurement of the cosmic-ray flux and mass composition, as well as more thorough tests of hadronic interaction models, will improve the understanding of muons and atmospheric neutrinos detected in the ice, in particular, regarding prompt muons. Moreover, the surface array provides a cosmic-ray veto for the in-ice detector and contributes to the calibration of the optical and radio arrays. Last but not least, the surface array will make major contributions to cosmic-ray science in the energy range of the transition from Galactic to extragalactic sources. The increased sensitivities for photons and for cosmic-ray anisotropies at multi-PeV energies provide a chance to solve the puzzle of the origin of the most energetic Galactic cosmic rays and will serve IceCube’s multimessenger mission