First record of a successful reproduction of Chaco Eagle (Buteogallus coronatus) in Santa Fe province, Argentina

El Águila Coronada o Águila del Chaco (Buteogallus coronatus) es una especie de ave rapaz del sur de Sudamérica. Sus poblaciones se encuentran amenazadas, entre otros factores, por la destrucción del hábitat, la persecución directa, la electrocución en tendidos eléctricos y el ahogamiento en reservorios de agua. En los últimos años, los registros de territorios, nidos y reproducciones exitosas de la especie en Argentina se han concentrado al sur de su límite de distribución (oeste de La Pampa y sur de Mendoza). Sinembargo, en la provincia de Santa Fe, considerada clave para la conservación de esta especie, nunca se registró una reproducción exitosa. En esta publicación damos cuenta del descubrimiento y monitoreo de un nido activo de Águila Coronada en la provincia de Santa Fe que resultó exitoso. Este hallazgo pone de manifiesto la necesidad de establecer un monitoreo a largo plazo de las poblaciones de la especie en esta provincia.Chaco Eagle (Buteogallus coronatus) is a bird of prey of southern South America. Its populations are endangered because of, amongst other factors, habitat destruction, direct persecution, electrocution on power lines and drowning in water reservoirs. During the last years, data on territories, nests and successful reproductions of this species in Argentina have been concentrated at the southernmost part of its distribution area (western La Pampa and southern Mendoza). However, in Santa Fe province, considered as a priority for Chaco Eagle conservation, no successful reproductions have ever been registered. In this paper we record the discovery and monitoring of an active Chaco Eagle nest in Santa Fe province which eventually was successful. This finding demonstrates the necessity of establishing a long-term monitoring of Chaco Eagle populations in this province.Fil: Merlino, Víctor. Cooperativa Tambera y de Consumo Elisa Limitada; ArgentinaFil: Gallego García, Diego. Universidad Nacional de La Pampa. Facultad de Ciencia Exactas y Naturales. Departamento de Recursos Naturales. Centro para el Estudio y Conservación de Aves Rapaces; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentin

Biogeography of planktonic bacterial communities across the whole Mediterranean Sea

Bacterial population distribution in the Mediterranean Sea has been mainly studied by considering small geographical areas or specific phylogenetic groups. The present study is a molecular microbiology investigation aimed to identify the environmental factors driving total bacterioplankton community composition of seawater samples collected along a transect covering the whole Mediterranean Sea. We performed automated ribosomal intergenic sequence analysis (ARISA) and microscope evaluation of prokaryotic abundance of seawater sampled across both vertical profiles and longitudinal transects in the whole basin. Prokaryotic abundance decreased with depth at all the stations and presented similar values in epi-, meso- and bathypelagic layers across the whole Mediterranean Sea. However, peculiar bacterial assemblages were selected along a longitudinal transect in the epipelagic layers of the eastern and western sub-basins. Vertical differences of the bacterial communities were observed only when considering the epi- and bathypelagic waters, while the study of the structure of bacterial communities at a finer scale across the water column displayed higher variability at the intermediate layers. Nonetheless, different physico-chemical factors were significantly related to the distribution of bacterial populations, both according to geographic position and down the water column in the whole Mediterranean Sea. These results demonstrated that bacterial assemblages are putatively correlated to different water masses of the complex hydrographical systems of the eastern and western Mediterranean sub-basins