79 research outputs found
Higher predation risk for insect prey at low latitudes and elevations
Biotic interactions underlie ecosystem structure and function, but predicting interaction outcomes is difficult. We tested the hypothesis that biotic interaction strength increases toward the equator, using a global experiment with model caterpillars to measure predation risk. Across an 11,660-kilometer latitudinal gradient spanning six continents, we found increasing predation toward the equator, with a parallel pattern of increasing predation toward lower elevations. Patterns across both latitude and elevation were driven by arthropod predators, with no systematic trend in attack rates by birds or mammals. These matching gradients at global and regional scales suggest consistent drivers of biotic interaction strength, a finding that needs to be integrated into general theories of herbivory, community organization, and life-history evolution
90-річчя члена-кореспондента НАН України Г.К. Степанковської
The p(T)-differential production cross section of electrons from semileptonic decays of heavy-flavor hadrons has been measured at midrapidity in proton-proton collisions at root s = 2.76 TeV in the transverse momentum range 0.5 < p(T) < 12 GeV/c with the ALICE detector at the LHC. The analysis was performed using minimum bias events and events triggered by the electromagnetic calorimeter. Predictions from perturbative QCD calculations agree with the data within the theoretical and experimental uncertainties
Data from: Higher predation risk for insect prey at low latitudes and elevations
Biotic interactions underlie ecosystem structure and function, but predicting interaction outcomes is difficult. We tested the hypothesis that biotic interaction strength increases toward the equator, using a global experiment with model caterpillars to measure predation risk. Across an 11,660-kilometer latitudinal gradient spanning six continents, we found increasing predation toward the equator, with a parallel pattern of increasing predation toward lower elevations. Patterns across both latitude and elevation were driven by arthropod predators, with no systematic trend in attack rates by birds or mammals. These matching gradients at global and regional scales suggest consistent drivers of biotic interaction strength, a finding that needs to be integrated into general theories of herbivory, community organization, and life-history evolution
Rodents, not birds, dominate predation-related ecosystem services and disservices in vertebrate communities of agricultural landscapes
Heavy-flavour hadron decay leptons in Pb-Pb and Xe-Xe collisions at the LHC with ALICE
Heavy quarks, i.e. charm and beauty, are sensitive probes of the medium
produced in high-energy heavy-ion collisions. They are produced in the
early stage of the collision, mainly in hard partonic scattering
processes, and are expected to experience the whole collision evolution
interacting with the medium constituents via both elastic and inelastic
processes. The nuclear modification factor (R-AA) is one of the main
experimental observables that allow us to investigate the interaction
strength of heavy quarks with the medium. The ALICE collaboration
measured the production of open heavy-flavour hadrons via their
semi-leptonic decays to electrons at mid-rapidity and to moons at
forward rapidity in elementary proton-proton (pp) collisions as well as
p-Pb, Ph-Ph and in Xe-Xe collisions
- …