CGR03 Effects of spring burning on Grasshopper Nymphs (1982)


Sweep samples were taken for grasshoppers (Arcididae) at two upland sites on 5 watersheds at approximately two week intervals, June-Sept 1982. At each site on each occasion, 20 sets of 20 sweeps (400 sweeps total) were taken. Stored data include for each site on each occasion: total number of each species (all instars combined) collected and total number for each instar for each species (400 sweeps combined).

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Monitor changes in species composition of grasshopper assemblages over the course of the summer on unburned areas and areas burned for the first time in 1, 2, or 4 years.


Location of Sampling Stations: All sites on upland (Florence & Dwight-Irwin) soils (1982)

Frequency of Sampling: 20 samples of 20 sweeps each (400 sweeps total) were taken at each of the 10 sites at approximately two week intervals from June 1- September 2, 1982.

Variable Measured: Date, location, time, wind, temperature, species

Methods: Sweeps were taken with standard canvas nets 38 cm in diameter by the same two individuals throughout the summer, each of whom took ten sets of 20 sweeps along parallel transects (5-10 m apart) 200 m long. Transects were flagged, enabling sweeps to be taken in the same local areas on each occasion. A sweep was taken at each step by traversing an arc of 180° with the net through the top layer of vegetation. After 20 such sweeps, the contents of the net were emptied into plastic bags. These samples were frozen until grasshoppers were removed and identified.

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