Community structure of spiders in rice based rabi crops
2001
Kamal, N.Q. | Ahmed, N. (Bangladesh Rice Research Inst., Gazipur 1701 (Bangladesh). Entomology Div.)
Bangladesh has an inherent biodiverse environment and as such is able to grow diverse crops such as cereals, jute, beverages, pulses, oilseeds, fruits and vegetables. An experiment was carried out to study the relative abundance, composition and structure of spiders on 14 different rabi crops (e.g. wheat, chick pea, edible podded bean, bush bean, peanut, pigeon pea, sesame, mustard (Tori and Sambal), safflower, flax, soybean, pea, and sunflower) and T. Aman crops: Boro seed bed, and rice stubble. The spiders were virtually monitored during 1994-1995, 1995-1996 and 1996-1997 rabi seasons (dry seasons) weekly in 48 sampling occasions. Fifteen species of spiders were present in wheat, 13 in chickpea, 12 in each of edible podded bean and bush bean, 10 in flax, 9 in each of peanut, sunflower and safflower, 8 in each of sesame and pea, 7 in seedbed, 6 in rice stubble, 5 in each of soybean and pigeon pea, and 21 in rice fields. The survey showed that only three spide species were associated with both rice and wheat crops (Lynx spider, Oxyopes javanus, Leucauge decorata, and Thomisus cherapunjeus). In rice, T. cherapunjeus was the dominant spider species followed by Pardosa pseudoannulata and Bianor sp. Lycosids were dominant in most non-crop fields, except for wheat and sunflower where Thomisids and Oxyopids were dominant, respectively. But in rice seed bed, stubble and rice fields spider community was dominated by Lycosids, Oxyopids and Tetragnathids, respectively. Intensive uniform samplings taken at different occasions revealed that spider richness and diversity increased with crop age
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