Abundância de três espécies de aranhas (Araneae) em ecossistemas nativos e manejados no Rio Grande do Sul, Brasil

Abstract

Abundances of three spider (Araneae) species in native and managed ecosystems in Rio Grande do Sul State, Brazil Abundância de três espécies de aranhas (Araneae) em ecossistemas nativos e manejados no Rio Grande do Sul, Brasil AbstractWe assessed the abundance patterns of three theridiid species: Hetschkia gracilis (Keyserling 1886); Phycosoma altum (Keyserling 1886); and Thwaitesia affinis O. P.-Cambridge, 1882 in four habitats: Araucaria Forest (native forest) and plantations of A. angustifolia, Pinus spp., and Eucalyptus spp. in Floresta Nacional de São Francisco de Paula Reserve, southern Brazil. The plantation stands in the study system are managed by the selective cutting of adult trees, allowing longer rotation intervals. We collected spiders in 2003 and 2004 by beating the vegetation inside three replicates of each forest type. We performed a permanova to test whether there were differences on species abundances between habitats. We tested the influence of the stand sizes, distance between stands, and vegetation cover composition on each spider species abundance. Stands with higher vegetation cover of bushes and vines presented higher abundances of Hetschkia gracilis and Thwaitesia affinis. Phycosoma altum abundance did not respond to any explanatory variables. Results highlighted the importance of alternative management of plantation stands to enhance and maintain the understory vegetation diversity, which in turn support the spider populations.

صدام - لقاء ثقافتین فی روایة "هجوم على النیل" لإروس بالدیسیرا

“…Il romanzo Assalto sul Nilo di Baldissera è uscito nel 2007, si tratta di un racconto tra realtà vissuta e fantasia inventata. La narrazione inizia, infatti, con un sogno 25 ; un'avventura di Abu Amìr al-Bunduqàni (padre di Amir il veneziano) che simboleggia, secondo me, l'io narrante, l'autore (Eros Baldissera il veneziano). Questo sogno nel prologo dell'Assalto richiama, a mio avviso, lo stesso stratagemma narrativo di Annie vivanti nel suo romanzo ''Terra di Cleopatra'' 26 .…”