Browsing by Author "Hermosilla, Wladimir"
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Item Estudios ecológicos en Isla Robert (Shetland del Sur) 2. Distribución altitudinal de los artropodos terrestres(Instituto Antártico Chileno, 1968) Schlatter, Roberto; Hermosilla, Wladimir; Di Castri, Francesco; Instituto Antártico ChilenoEn la isla Robert (Shetland del Sur) se realizaron recolecciones cuantitativas de Artrópodos terrestres, extraídos mediante embudos de Berlese-Tullgren. La zona estudiada fue el cerro Triplet (140 m) y algunos lugares planos de la isla. La diversidad específica, expresada en bits por individuo, es en general más alta en el cerro que en las zonas bajas. En cuanto a la densidad, expresada en individuos por 1000 cc, ésta disminuye hacia las partes superior es del cerro.Item Estudios ecológicos en Isla Robert (Shetland del Sur) 6. Variaciones altitudinales de la fauna edáfica (Cerro Triplet)(1970) Zeiss, Eduardo; Hermosilla, Wladimir; Schlatter, RobertoThe material over wich the present study is based, was taken at the Robert Island (South Shetland Islands). One Altitudinal transect of the Triplet hill (140 m high) was made, taking 3 soil samples at each of 7 station. The.same type of sampling was repeated 15 days later. All sampIes weres of the same volume (50 cc), and of the same type of material: regosol. The edaphic was extrated by means of Berlese-Tullgren Funnels. Data of specific diversity expresed as bits individual were obtained, working with the Shannon-Wiener formule. Actual figures are given in 6 tables and 4 curves, including also data of faunal density (Nº individuals 1000 cc of material), relative abundance (%) and number of species found. Main conclusions are: a) if climatic conditions are "favorable" it is enough to take only one sample (50 cc) at each station, on the contrary, for "unfavorable" climatic conditions, more than one sample should be taken at each station. b) the edaphic zoocenoses living at the top of the hill, were found to be different than those living at the base of the same hilI. c) dominant groups oí Arthropods are Acarina and Collembola.