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- Title
Grasshopper population dynamics and meteorological parameters -- lessons from a case study
- Authors
Perner, J.; Schumacher, J.; Kohler, G.
- Abstract
Population dynamics of grasshoppers differing in phenology were analysed on a xerothermic meadow in Central Germany . The study was basedon standardized annual sweep net samples in relation to meteorological factors (mean and maximum temperature, rainfall, sunshine) from May through September of current and previous year, respectively. Threegrasshopper species, the early hatching Euthystira brachyptera, the phenologically intervening Stenobothrus lineatus, and the late hatching Gomphocerus rufus, were investigated over ten years during three periods: 1971-74, 1983-85, 1987-89. By means of stepwise linear regression and a cross-validation procedure a subset of meteorological parameters was extracted which best described the field sampling data of the grasshoppers. This subset of variables was then used in multiple linear regression analyses in order to model the long-term populationdynamics of the grasshoppers from 1971 to 1990. The selected variables for each species revealed different influences of meteorological parameter combinations reflecting the different phenologies. The dynamics of the three gomphocerine species modelled for 20 years (1971-1990) differed both with maxima and minima in different years and in thefluctuation factors from 29 (E. brachyptera) to 155 (S. lineatus). In comparison with fluctuation trends in populations of other sites within the region some species-specific and habitat-specific populationdynamics must be assumed. There were no significant correlations between annual aridity (precipitation-temperature)-indices and densitiesof the three populations studied.
- Subjects
METEOROLOGY; INSECTS; GRASSHOPPERS; PHENOLOGY
- Publication
Ecography, 1999, Vol 22, Issue 2, p205
- ISSN
0906-7590
- Publication type
Article