Realm: Terrestrial
Climate: Temperate
Biome: Temperate broadleaf and mixed forests
Central latitude: 45.400000
Central longitude: -93.200000
Duration: 18 years, from 1989 to 2006

7958 records

61 distinct species

Across the time series Melanoplus femurrubrum is the most frequently occurring species

Methods

Approximately 20 old agricultural fields which were abandoned at various times make up the core of e014. In these core fields four permanent sampling transects were laid out in each field. Fields 22 and 29 have 6 transects but these fields are not generally considered part of the core group. In addition to these core old fields. many other similar abandoned fields exist at Cedar Creek and a subset was also sampled for grasshoppers. For the purpose of the grasshopper sampling these fields have been labeled as “supplemental” old fields. The supplemental fields did not have permanent transects in them and grasshopper sampling methods were adjusted accordingly. Grasshoppers in 19 core E014 old fields were sampled by sweepnet mid-month from June through September from 1989-2006. Field 28 was added in 1997 and field 11 was added in 2002. bringing the total core field count to 21. Sampling dates are summarized in Table: Core Old Fields Grasshopper Sampling. fields and dates. In each sampling period. 50 sweeps were taken with a 15-inch muslin sweep net along four 40m transects (labeled G. R. W. Y) near the center of each plot. The total number of sweeps for each field in each sample period was 200. with an annual total of 800 sweeps/field. A sweep consisted of a rapid approximately 2m-long horizontal swing of the net through the vegetation. Sweeps were generally collected between 10am-4pm during a two day period when it had not rained and weather was fair with sunny skies. modest breezes. and temperatures above 70°F. The contents for each transect were bagged separately in 1-gallon plastic bag. but counts in this data set are pooled by sampling period. Samples where frozen until Orthoptera could be counted and identified to genus and species (where possible). All identifications were done by John Haarstad. *Note about comparing experiments: morphological notes may not indicate the same species/group in different experiments. -------------- Core Old Field Grasshopper Sampling: Irregularities to Note 1) Only the family Acrididae was recorded throughout the entire survey period (1989-2006). Other families were sorted and identified in all years except 1992 and 1993. 2) Two newly abandoned fields were added to the core old field survey after it began in 1989. Field 28 was added in 1997 and field 11 was added in 2002. 3) In 2003. samples were lost from 7 fields in June (21. 24. 26. 27. 32. 39. 40) and 4 fields in August (47. 45. 53. 76). The total counts for these fields were augmented by proportional additions from remaining samples by John Haarstad and crew. 4) During the first three years of this study (1989-1991) John Haarstad was unable to distinguish several species of Melanoplus nymphs and they were lumped under the identification: “Melanoplus undet nymphs”. No other serious difficulties in identification were encountered. Sweepnet Unit of abundance = IndCountInt, Unit of biomass = NA

Citation(s)

Knops, J. & Tilman, D. Successional Dynamics on a Resampled Chronosequence - Experiment 014. Cedar Creek Ecosystem Science Reserve. Available at http://www.cedarcreek.umn.edu/research/data/dataset?ghe014, accessed 2016.