Contrasting multi-taxa diversity patterns between abandoned and non-intensively managed forests in the southern Dolomites

The abandonment of silvicultural activities can lead to changes in species richness and composition of biological communities, when compared to those found in managed forests. The aim of this study was to compare the multi-taxonomical diversity of two mature silver fir-beech-spruce forests in the southern Dolomites (Italy), corresponding to the European Union habitat type 9130. The two sites share similar ecological and structural characteristics, but differ in their recent management histories. In the last 50 years, one site underwent non-intensive management, while the other was left unmanaged and was included in a forest reserve. The species richness and composition of eight taxa were surveyed in the two sites between 2009 and 2011. The difference in mean species richness between the two forest management types was tested through permutation tests, while differences in species composition were tested by principal coordinates analysis and the permutational multivariate analysis of variance. Mean species richness of soil macrofungi, deadwood lichens, bark beetles, and longhorn beetles were significantly higher in the abandoned than in the non-intensively managed forests. Deadwood fungi and epiphytic lichens did not differ in mean species richness between the two study sites, while mean species richness of ground beetles and birds were higher in the non-intensively managed than in the abandoned forest. Significant differences in species composition between the two sites were found for all the taxa, except for longhorn beetles. These results indicate that improving forest landscape heterogeneity through the creation of a mosaic of abandoned and extensively managed forests should better fulfill the requirements of ecologically different taxa

Divergência genética entre progênies de erva-mate com base em dados fitoquímicos.

Resumo

Procedimentos metodológicos utilizados na compilação de dados do Modeflora para construção de mapas dinâmicos no cartão microSD para uso no GPS.

O planejamento da exploração florestal em florestas tropicais, realizada com técnicas de precisão recomendadas pelo Modelo Digital de Exploração Florestal (Modeflora), permite significativas vantagens. Porém, para que o planejamento da exploração florestal seja executado com precisão e agilidade pelas equipes de campo, é necessário que todas as informações estejam consolidadas num mapa dinâmico. Para que todas as informações fiquem consolidadas num único conjunto de mapas dinâmicos, há necessidade de compilar os dados em um formato de arquivo digital (IMG), o qual é reconhecido pelos receptores GPS e navegadores automotivos. As informações permanecem armazenadas num cartão de memória (SD ou microSD) e o aparelho de GPS fica com memória livre para a coleta de pontos e trilhas. Caso não se faça a compilação dos dados para o cartão de memória, a quantidade de waypoints e trilhas a serem inseridas no GPS será limitada, além de impossibilitar a gestão em campo para adicionar ou retirar um mapa de exploração de determinado pátio.bitstream/item/27594/1/Circular-tec-52.pd

Variabilidade genética dos teores de compostos fenólicos em um germoplasma de erva-mate cultivado no Brasil.

Resumo

Características fotossintéticas de batata cv. Baronesa e seu genótipo transformado geneticamente para resistência ao PVY.

Made available in DSpace on 2011-04-09T16:16:03Z (GMT). No. of bitstreams: 1 bacarincaracteristicas.pdf: 744976 bytes, checksum: ee8f4f2bc344fa1fd86eb4ef654fe238 (MD5) Previous issue date: 2008-11-2

Background Light in Potential Sites for the ANTARES Undersea Neutrino Telescope

The ANTARES collaboration has performed a series of {\em in situ} measurements to study the background light for a planned undersea neutrino telescope. Such background can be caused by $^{40}$K decays or by biological activity. We report on measurements at two sites in the Mediterranean Sea at depths of 2400~m and 2700~m, respectively. Three photomultiplier tubes were used to measure single counting rates and coincidence rates for pairs of tubes at various distances. The background rate is seen to consist of three components: a constant rate due to $^{40}$K decays, a continuum rate that varies on a time scale of several hours simultaneously over distances up to at least 40~m, and random bursts a few seconds long that are only correlated in time over distances of the order of a meter. A trigger requiring coincidences between nearby photomultiplier tubes should reduce the trigger rate for a neutrino telescope to a manageable level with only a small loss in efficiency.Comment: 18 pages, 8 figures, accepted for publication in Astroparticle Physic

Forward pi^0 Production and Associated Transverse Energy Flow in Deep-Inelastic Scattering at HERA

Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x \approx 4.10^-5 which give rise to high transverse momentum pi^0 mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi^0 mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi^0 and of the four-momentum transfer Q^2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi^0 meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.Comment: 27 pages, 8 figures and 3 table

Reconstruction of truncated images for PeVatron searches with the Cherenkov Telescope Array

The Cherenkov Telescope Array (CTA) will be the future ground-based gamma-ray observatory using the imaging atmospheric Cherenkov technique. One of CTA's key science projects is the search for galactic PeVatrons, extreme sources of accelerating cosmic particles. CTA's sensitivity in the multi-TeV region is crucial for this goal. A dedicated reconstruction of the telescopes' truncated images has been implemented in the CTA reconstruction pipeline in order to optimize CTA's sensitivity at very high energies (E > 10 TeV). First results are presented together with perspectives for PeVatron searches with CTA-North array

Cherenkov Telescope Array potential in the search for Galactic PeVatrons

One of the major scientific objectives of the future Cherenkov Telescope Array (CTA) Observatory is the search for PeVatrons. PeVatrons are cosmic-ray factories able to accelerate nuclei at least up to the knee feature seen in the spectrum of cosmic rays measured near the Earth. CTA will perform a survey of the full Galactic plane at TeV energies and beyond with unprecedented sensitivity. The determination of efficient criteria to identify PeVatron candidates during the survey is essential in order to trigger further dedicated observations. Here, we present results from a study based on simulations to determine these criteria. The outcome of the study is a PeVatron figure of merit, defined as a metric that provides relations between spectral parameters and spectral cutoff energy lower limits. In addition, simulations of the PeVatron candidate HESS J1641-463 and its parental particle spectrum are presented and discussed. Eventually, our work is applied to simulated population of Galactic PeVatrons, with the aim to determine the sensitivity of CTA