<p>A adaptação das aranhas aos diversos tipos de ambientes e suas relações com as comunidades vegetais existentes, as colocam como peças-chaves nos ecossistemas florestais e excelentes organismos bioindicadores devido à sensibilidade aos efeitos da urbanização e fragmentação de ecossistemas. Visando inventariar e investigar a riqueza da fauna de aranhas de solo de um fragmento de mata antropizado, utilizou-se 50 “pitfalls trap” (número total de amostras = 600), durante 12 meses no período entre 2010–2011. Um total de 1238 indivíduos foi coletado, os quais estiveram distribuídos em 51 espécies pertencentes a 18 famílias, das quais Zodariidae e Lycosidae foram as mais abundantes, e Salticidae e Theridiidae as com maior riqueza. Observou-se ainda um alto percentual de espécies raras (“Singletons e Doubletons”). A tendência de não estabilização dos estimadores de riqueza e a relação da predição de espécies coletadas e esperadas indicam que a área precisa de uma melhor amostragem, visando melhor conhecimento da biodiversidade existente e contribuindo para o desenvolvimento para a preservação e conservação da biodiversidade local.</p><p><strong>Palavras chave</strong>: Araneofauna, aracnídeos, ecossistemas, urbanização.</p><p><strong>Epigeal spiders in a forest fragment in an urban area of the city of Fortaleza, Ceará, Brazil</strong></p><p><strong>Abstract</strong>: Spiders are indicators of environment quality due fact of been sensible to environment changes. Their adaptions among the environment and their relations between vegetal communities make them have a special role in forest ecosystems. However, this relation makes spiders susceptible to effects of urban process and to defloration and ecosystem fragmentation process. A spider fauna survey was developed using 50 “pitfall traps”, annual sample process begun in 2010 and finished in 2011 (total samples = 600) in an urbanized patch. A total of 1238 individuals were collected, constituting 51 species belonged to 18 families which Zodariidae and Lycosidae were most abundant, and Salticidae and Theridiidae were the richest families. It´s also observed many rare species (Singletons and Doubletons). The richness estimators didn´t exhibit a trend do exhibit an asymptote and the relation between collected species and estimated species, suggesting more samples process also suggests a necessity of develop politics to preserve the local biodiversity.</p><p><strong>Key words</strong>: Araneofauna, arachnids, ecosystems, urbanization.</p>
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