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OALib Journal期刊

ISSN: 2333-9721

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The effects of habitat heterogeneity on avian density and richness in soybean fields in Entre Ríos, Argentina
Goijman,Andrea P.; Zaccagnini,María Elena;
El hornero , 2008,
Abstract: birds play several roles in agricultural lands and respond to habitat heterogeneity within the agricultural landscape. agricultural intensification in argentina has increased the sown area, mainly with soybean, fragmenting landscapes in the pampas and mesopotamic region. in entre ríos province, the original espinal forest has been fragmented, leaving remnant patches of natural vegetation, in cases modified by cattle grazing. these changes represent a potential threat for avian conservation. in entre ríos, terraces may be a useful habitat in maintaining avian diversity, similar to other non-cropped linear habitats in agricultural landscapes. we tested the hypothesis that habitat heterogeneity created by terraces would maintain higher species richness and densities of avian species that use original or modified forests within cropped areas compared to fields without terraces. the study was carried out in soybean fields with an adjacent forest and either herbaceous, shrub or no terraces in two periods (march-april 2004). birds were surveyed using line transects in field interior and edge, and observations were carried out in one forest remnant adjoining each field. most bird species recorded in soybean fields were insectivorous or consume invertebrates during the breeding season. species richness, total bird density and the density of granivores, insectivores and omnivores were higher in fields with terraces than in fields without terraces. moreover, shrub terraces had higher effect on species richness and bird density than herbaceous terraces. our results suggest that terraces may serve as a possible tool for maintaining avian diversity in agroecosystems in entre ríos.
Grain size modification in the magnetocaloric and non-magnetocaloric transitions in La0.5Ca0.5MnO3 probed by direct and indirect methods
M. Quintero,S. Passanante,I. Irurzub,D. Goijman,G. Polla
Physics , 2014, DOI: 10.1063/1.4898129
Abstract: The influence of the grain size in the magnetic properties of phase separated manganites is an important issue evidenced more than a decade ago. The formation of long range ordered phases is suppressed as the grain size decreases giving place to a metastable state instead of the ground state. In this work we present a study of the magnetocaloric effect in the prototypical manganite La0.5Ca0.5MnO3 as function of the grain size. The differences obtained using direct and indirect methods are discussed in the framework of domain walls in the ferromagnetic phase of the system.
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