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Spiders (Araneae) Associated with Rice in Arkansas with Notes on Species Compositions of Populations

J. S. Heiss and M. V. Meisch
The Southwestern Naturalist
Vol. 30, No. 1 (Mar. 27, 1985), pp. 119-127
DOI: 10.2307/3670665
Stable URL: http://www.jstor.org/stable/3670665
Page Count: 9
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Spiders (Araneae) Associated with Rice in Arkansas with Notes on Species Compositions of Populations
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Abstract

An investigation of spiders associated with rice fields in Arkansas was made to provide a foundation to evaluate spiders as predators of rice insect pests and mosquitoes. Using aquatic dip net and metal dipper, 1201 spider specimens were collected over four seasons, resulting in a checklist including 12 families, 30 genera and 40 species. Four new species records for Arkansas were recorded: Eperigone banski Ivie and Barrows, Erigone dentigera O.P.-Cambridge, Ozyptila creola Gertsch, and Zygoballus rufipes Peckham and Peckham. The composition of the spider population in rice fields was broken down into three guilds based on method of prey capture: web spinners, ambushers, hunters. The dominant guild was the hunting spiders (67.5%). The web-spinners and ambushers constituted 32.1% and 0.4% of the total, respectively. The most abundant individual species of spiders were Pardosa milvina (Hentz), Glenognatha foxi (McCook) and Tetragnatha laboriosa Hentz. The population of spiders in rice fields treated with carbofuran insecticide was compared with populations from untreated fields. Carbofuran has little effect on spider populations in general but may decrease species diversity.

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