Nuevos registros de Orchestoidea tuberculata Nicolet 1849 (Amphipoda, Talitridae), en la costa de Chile

We report new localities of the talitrid amphipod Orchestoidea tuberculata Nicolet 1849 in sand beaches from the Chilean coast, extending the southern distributional limit of the species to the inner sea of Aysén Region, Chile. Besides, we discuss the need for more taxonomic studies, to exclude the presence of more than one species in the genusSe reportan nuevas localidades para el anfípodo talítrido Orchestoidea tuberculata Nicolet 1849 en playas arenosas de la costa Chilena, extendiéndose el límite sur de distribución de la especie hasta el mar interior de la región de Aysén. Además, se discute la necesidad de intensificar los estudios taxonómicos con el objeto de descartar la presencia de más de una especie en el género

DIETA DEL PATO QUETRU NO VOLADOR (TACHYERES PTENERES) EN ISLAS DEL SUR DE CHILE

Resumen ∙ El presente trabajo provee información sobre la dieta de subadultos de Pato Quetru no Volador (Tachyeres pteneres) en cuatro islas del sur de Chile durante los periodos estivales de los años 2007, 2009, 2012, 2013 y 2014. Se colectaron 293 fecas en cuatro islas del centro y sur de Chile: Isla Guamblin, isla Guapiquilán, isla Lacaos e isla Guafo. Se comparó el consumo de presas entre islas. Se identificaron 686 restos duros de invertebrados y vertebrados marinos y algas. Los cangrejos (Cancridae) se registraron como la presa más consumida en las cuatro islas. El número de categorías tróficas en las cuatro islas fluctuó entre 1 y 6 familias/feca. Al comparar el patrón de consumo de presas presentes en la dieta en las cuatro islas se observaron diferencias estadísticamente significativas en la composición de la dieta. Para las islas Lacaos y Guapiquilán las presas más consumidas correspondieron a cangrejos, mientras que para las islas Guafo y Guamblin las presas más consumidas fueron los moluscos (Mollusca). Abstract ∙ Diet of the Magellanic Flightless Steamer-Duck (Tachyeres pteneres) in islands of southern Chile We provide information on the diet of the Magellanic Flightless Steamer-Duck (Tachyeres pteneres) in four continental islands of southern Chile during the Austral summer periods of the years 2007, 2009, 2012, 2013, and 2014. A total of 293 feces were collected in Guamblin island, Guapiquilán island, Lacaos island and Guafo island. Based on these we identified 686 hard remains of invertebrates, marine vertebrates, and algae. Crabs (Cancridae) were the most common prey consumed across the four islands. The number of trophic categories fluctuated between 1 to 6 families/feces across the four islands. We found statistically significant differences in diet composition between the four islands. In Lacaos and Guapiquilán islands, the most consumed prey corresponded to crabs, while in Guafo and Guamblin islands the most consumed prey were mollusks (Mollusca)

First Records and Community Pattern of Arcellinida Inhabiting a Pristine and Remote Island from Southeastern Pacific, Chile

We investigate for the first time the species composition and community structure of lobose thecamoebians (Arcellinida) inhabiting an unpopulated and pristine island from the southeastern Pacific. Results revealed low alpha diversity and a high proportion of cosmopolitan species. One genus, four species and two subspecies were identified for the first time for southwestern South America. Further, four morphotypes were not identifi ed to species level, and one could not be identifi ed to species or genera level. They are probably endemics of this poorly studied and remote zone. These results were consistent with the moderate endemicity hypothesis of microbial biogeography. We hypothesized that the low diversity of species recorded on the island is due to selective colonization-extinction dynamics, processes that determines the low species richness of insular macro-organisms. However, this hypothesis needs to be evaluated in the future. Statistical analysis showed that testate amoebae were distributed in two discrete communities in the island. The first consisted of organisms inhabiting habitats located within a forest and the second by organisms inhabiting habitats located outside the forest. The suggested primary factor differentiating these both communities was the availability of appropriate habitat for the different species of testate amoebae

Sobre la presencia de Oryctomorphus bimaculatus Guérin, 1830 (Coleoptera: Scarabaeidae: Rutelinae) en el Parque Nacional Isla Guamblin, Aysén, Chile

Oryctomorphus bimaculatus Guérin, 1830 is for the first time recordered from Guamblín Island National Park, extending the species distribution range to Aysén Region, Chile.Se da a conocer el primer registro de Oryctomorphus bimaculatus Guérin, 1830 para el Parque Nacional Isla Guamblín, extendiendo la distribución de la especie hasta la Región de Aysén, Chile

Summer diet of black-chested buzzard-eagle (Geranoaetus melanoleucus) in Aysen district, Chilean Patagonia

Se describen los ítem-presas del Águila (Geranoaetus melanoleucus) registrados en una localidad de la región de Aysén, Patagonia chilena. A través del análisis de 66 egagrópilas y 56 restos de presas colectados durante parte de los periodos reproductivos 2007, 2008 y 2009, se identificó un total de 11 taxones de vertebrados: cuatro especies exóticas y siete especies nativas. Sobre este total, la liebre europea fue el taxón con mayor número de registros durante las tres temporadas, representando el 46.55% de la dieta de esta rapaz, seguido de Rodentia con 33.45% del total. Aunque estos resultados se restringen a una localidad y no incluyen la variabilidad intra-anual en el consumo de presas del Águila en esta zona de la Patagonia, son consistentes con lo reportado en otras localidades de Chile y Argentina, donde se ha observado un mayor consumo de lagomorfos introducidos por sobre algunas especies [email protected] describe the prey items consumed by the Black-Chested Buzzard-Eagle (Geranoaetus melanoleucus) registered in one study site in Aysén district, Chilean Patagonia. Through analysis of 66 pellets and 56 prey remains collected in the breeding periods 2007, 2008, and 2009, we identified a total of 11 vertebrate taxa: four exotic species and seven native species. The European hare was the taxon with the largest number of records during the three seasons, accounting for 46.55% of the diet of this raptor, Rodentia followed with 33.45% of the total. Although these results are restricted to one location and do not include intra-annual variability in prey consumption of Black-Chested Buzzard-Eagle in this area of Patagonia, are consistent with those reported in other locations in Chile and Argentina, where there has been an increased consumption of lagomorphs introduced over native species