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Available from: João Pedro Souza-Alves, Oct 04, 2015
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    • "Given the high diversity of tropical spider assemblages and the lack of knowledge on species' biology, they recognized future guild classifications can potentially be distinct from the present ones. Other studies in Brazil (Battirola et al. 2004; Oliveira-Alves et al. 2005; Peres et al. 2007; Souza-Alves et al. 2007; Rodrigues et al. 2009; Dias et al. 2010), South America (Silva 1996; Silva & Coddington 1996; Fló rez 1999; Avalos et al. 2007; Benavides & Fló rez 2007; Rubio et al. 2008) and elsewhere in the world (Jennings & Hilburn 1988; Uetz et al. 1999; Toti et al. 2000; Whitmore et al. 2002; Chen & Tso 2004; Sørensen 2004; Laeser et al. 2005; Loeser et al. 2006; Hore & Uniyal 2008), focused in various aspects of spider guilds, especially their differential occurrence in distinct environments , plant strata and capturability by different collection methods. "
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    ABSTRACT: We evaluated spider guild abundance and vegetation complexity in riparian forests in southern Brazil in four distinct river basins over 2 yr. We compared spider guild abundance among rivers, habitats (edges vs. forest interior), and against vegetation complexity. We also compared spider assemblages between juvenile and adults in terms of guilds. Of 42,057 spiders sampled, 79% were juveniles and 21% were adults. Space-web weaving was the most abundant guild whereas cursorial hunters was the least abundant one. Weaving spiders dominated over hunters (59% vs 40.58%, respectively). Thirty-four families were recorded; ambush hunters totaled 11 families; space web sheet builders and hunting runners had eight families each and there were seven families for orbicular web builders. Space web sheet builders dominated on all levels: among rivers and habitats (edges and forest interior). Unexpectedly, spider guilds did not seem to be influenced by environmental complexity, given the variables measured, under a Canonical Correspondence Analysis. There was an interaction between guild relative abundance and ontogeny, since the proportion of the space web sheet builders guild among adult spiders was larger than the proportion among juveniles, with a decrease in proportion of adults especially for hunting runners.
    Journal of Arachnology 07/2012; 40(1):39-47. DOI:10.1636/P10-105.1 · 0.62 Impact Factor
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    ABSTRACT: With Russian as the target language, a proof of concept study was undertaken to determine whether it is possible to identify linguistic features, control over which is implicated in progress on the Interagency Linguistic Roundtable (ILR) proficiency scale, thereby better to inform the instructional process. Following its development in an instrumentation study, a revised version of a computer-delivered battery of 33 perception and production tasks was administered to 68 participants—57 learners between levels 2 and 3 (21 at ILR 2, 18 at 2+, and 18 at 3) on the ILR scale, and 11 native speaker controls—whose proficiency was tested via an ILR oral proficiency telephone interview. The tasks sampled subjects’ control of Russian phonology, morphology, syntax, lexis, and collocations. Relationships between control of the linguistic features and the ILR levels of interest were assessed statistically. All 33 tasks, 18 of which assessed learners’ abilities in perception and 15 of which assessed their abilities in production, were found to differentiate ILR proficiency levels 2 and 3, and a subset was found to also distinguish levels 2 and 2+, and 2+ and 3. On the basis of the results, a checklist of linguistic features pegged to proficiency levels was produced that can be useful for syllabus designers, teachers, and learners themselves as well as providing the basis for future diagnostic tests.
    Studies in Second Language Acquisition 03/2012; 34(01). DOI:10.1017/S0272263111000519 · 1.11 Impact Factor