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      Composición y estructura del ensamble de tenebriónidos epigeos (Coleoptera: Tenebrionidae) de ecosistemas continentales e insulares del desierto costero transicional de Chile Translated title: Composition and structure of the epigean tenebrionid assemblage (Coleoptera: Tenebrionidae) of continental and insular ecosystems of the transitional coastal desert of Chile

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          Resumen: Se estudió la composición taxonómica, riqueza, abundancia y estructura espacio-temporal del ensamble de tenebriónidos epigeos en diferentes hábitats continentales e insulares del desierto costero transicional de Chile. Los muestreos se realizaron en el borde continental de Punta de Choros y en el archipiélago de Los Choros durante los años 2005 y 2006 mediante el uso de trampas de intercepción. Se capturó un total de 982 individuos pertenecientes a 7 tribus, 9 géneros y 17 especies, siendo Praocis Eschscholtz y Gyriosomus Guérin-Méneville los géneros más diversos. Se realizó el análisis Anosim que encontró diferencias significativas entre estaciones (R = 0.31; p = 0.01) pero no entre hábitats (R = 0.1872; p = 0.12), aunque con un bajo efecto de estos factores. La mayor riqueza y diversidad se observó en los hábitats estepa costera interior y estepa costera Choros, mientras que la mayor abundancia se registró en estepa costera interior (26.5%). No se observó una estructura estacional, pero los datos mostraron una mayor abundancia en primavera tanto en el continente como en las islas, a excepción de la isla Choros, donde la mayor abundancia se registró en invierno. Se discuten estas diferencias en relación con las características pedológicas y vegetacionales de los ambientes estudiados.

          Translated abstract

          Abstract: Pitfall traps were used to study the taxonomic composition, richness, abundance, and spatio-temporal structure of the assemblage of epigean tenebrionids in continental and insular habitats of the transitional coastal desert of Chile. Samplings were conducted on the coastal area of Punta de Choros and in the Archipelago Los Choros in 2005 and 2006. A total of 982 specimens were captured, belonging to 7 tribes, 9 genera, and 17 species. The most diverse genera were Praocis Eschscholtz and Gyriosomus Guérin-Méneville. The Anosim analysis showed statistically-significant differences between seasons (R = 0.31; p = .01) but not among habitats (R = 0.1872; p = .12), although the effect of these factors was low. The highest richness and diversity was observed in the interior coastal steppe and the coastal steppe of Los Choros, whereas the highest abundance occurred in the interior coastal steppe (26.5%). Seasonal structure was not observed; however, the data showed increased abundance in spring both in the continent and on the islands, with the exception of Choros island, where the highest abundance occurred in winter. This paper discusses the differences in the soil and plant characteristics of the ecosystems under study.

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          Most cited references 48

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          Biogeography of the tenebrionid beetles (Coleoptera, Tenebrionidae) on the Aegean Islands (Greece)

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            Biogeographical regionalisation of the Andean region.

             Juan Morrone (2015)
            A biogeographic regionalisation of the Andean region is proposed as a hierarchical classification of sub-regions, provinces, sub-provinces and districts. It is based on biogeographic analyses of terrestrial plant and animal taxa, and seeks to provide universality, objectivity and stability. The Andean region is currently comprised of the Central Chilean, Subantarctic and Patagonian sub-regions and the South American transition zone, 15 provinces, five sub-provinces and 81 districts. Complete synonymies and brief descriptions of the areas are provided, as well as the endemic taxa that diagnose the provinces.
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              Thermal and water relations of desert beetles.

               S. Thompson (2001)
              The physical problems that living organisms have to contend with in hot deserts are primarily extremes of temperature, low humidity, shortage or absence of free water, and the environmental factors that accentuate these--such as strong winds, sand-storms, lack of shade, rocky and impenetrable soils. Climatic factors are particularly important to smaller animals such as arthropods on account of their relatively enormous surface to volume ratios. Nevertheless, beetles (especially Tenebrionidae and, to a lesser extent, Chrysomelidae) are among the most successful animals of the desert, and are often the only ones to be seen abroad during the day. Similar physical problems are experienced by insects in all terrestrial biomes, but they are much enhanced in the desert. Although climatic extremes are often avoided by burrowing habits coupled with circadian and seasonal activity rhythms, as well as reproductive phenology, several species of desert beetle are nevertheless able to withstand thermal extremes that would rapidly cause the death of most other arthropods including insects. The reactions of desert beetles to heat are largely behavioural whilst their responses to water shortage are primarily physiological. The effects of coloration are not discussed. In addition to markedly low rates of transpiration, desert beetles can also withstand a considerable reduction in the water content of their tissues. The study of desert beetles is important because it illustrates many of the solutions evolved by arthropods to the problems engendered, in an extreme form, by life in all terrestrial environments.

                Author and article information

                Role: ND
                Role: ND
                Role: ND
                Revista mexicana de biodiversidad
                Rev. Mex. Biodiv.
                Instituto de Biología (México, DF, Mexico )
                December 2016
                : 87
                : 4
                : 1283-1291
                La Serena Coquimbo orgnameUniversidad de La Serena orgdiv1Instituto de Investigación Multidisciplinar en Ciencia y Tecnología Chile
                Mendoza Buenos Aires orgnameConsejo Nacional de Investigaciones Científicas y Técnicas orgdiv1Instituto Argentino de Investigaciones de las Zonas Áridas orgdiv2Laboratorio de Entomología Argentina
                La Serena Coquimbo orgnameUniversidad de La Serena orgdiv1Departamento de Biología orgdiv2Laboratorio de Entomología Ecológica Chile

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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