Invasive Species Compendium

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Abstract

Location of egg pods of Aulocara elliotti (Orthoptera: Acrididae) in a field of crested wheatgrass in Montana.

Abstract

The acridid Aulocara elliotti selected specific oviposition sites in a field of crested wheatgrass (Agropyron cristatum) in southwest Montana. The results indicated that selection could be influenced by soil temperature. Six locations were sampled for egg pods after oviposition terminated in the autumn: the north, south, east and west sides of grass clumps, the centre of grass clumps and the bare area to the south of each grass clump. Surface and soil temperatures were taken. Significantly more egg pods were found on the south side of clumps than on the east side or in the bare areas. However, these 3 locations contained nearly 3 times more egg pods than the west or north side. No egg pods were found in the centre of the grass clumps. The south sides of clumps were found to have the warmest soil temperature, with the east sides not significantly different in temperature from the bare area. The distribution of the number of egg pods found at any location was random for the north and west sides of grass clumps but not random for the south, east or bare locations.