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Sweepnet-collected invertebrate biomass from high- and low-input agricultural fields in Kansas



Sweepnet-collected invertebrate biomass from high- and low-input agricultural fields in Kansas



Wildlife Society Bulletin 25(1): 133-138



Various forms of low-input sustainable agriculture (LISA) are becoming more common in the Plains States, but little research has been conducted to evaluate the suitability of LISA fields for avian populations, except as nesting habitat. Because invertebrates are the primary food source of many grassland birds, we compared invertebrate biomass associated with LISA to that of conventionally farmed fields, grasslands, pastureland, and fallow fields. Sweepnets were used to collect invertebrate samples from twenty 1.5-ha plots at 2 locations in eastern Kansas. Invertebrates were sorted to order (Orthoptera and Hemiptera to family) and oven dried. Significantly higher biomasses (P lt 0.05) of invertebrates were collected from LISA, fallow, grassland, and pastureland plots than from conventionally farmed fields. invertebrate biomasses varied among different LISA treatments but few responses were significant because of limited replication of treatments and large variances. Two- to nine-fold differences in biomasses of Orthopteran and Hemipteran families were found among treatments. incorporation of LISA into intensive habitat-management programs could be beneficial to avian species relying on invertebrates as a food source.

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Accession: 002973927

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