作者
Hafiz Muhammad Tahir, Abida Butt
发表日期
2009/1/1
期刊
Pakistan J. zool
卷号
41
期号
2
页码范围
85-93
简介
Present study was designed to investigate the effect of different management practices and field margins on the abundance pattern of spiders in rice ecosystems. For this purpose four fields viz., reduced input field (RIF), organic field (ORF), herbicide treated field (HFT) and tilled field (TLF) were selected in district Sheikupura, Punjab, Pakistan. In total, 4645 spiders belonging to 7 families, 16 genera and 21 species were captured in pitfall traps during rice growing season of 2006. Species and numbers of lycosids were numerically dominant. Average number of spiders per pitfall was highest in ORF and lowest in TLF. Mean abundance, richness, diversity and evenness of spiders at different distances among different fields were compared using two-way ANOVA. Results showed non-significant differences between diversity and evenness. However, mean abundance and richness differed significantly. When different distances from field’s margins within each management practices were analyzed, significant differences between mean abundance, richness, diversity and evenness were recoded. Species composition did not differ significantly among fields or among distances but the activite density of individuals in each species showed significant differences. Canonical correspondence analysis showed that active density of most dominant species (Lycosa terrestris and Pardosa birmanica) was associated with ORF and RIF and with field’s margin (0 m distance).
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