L. Forró szerk.: Miscellanea Zoologica Hungarica 12. 1998 (Budapest, 1998)
Horváth, Gy.: Population dynamics and trappability of four rodent species in a forest habitat
caused the inaccuracy of the estimation that appears in Fig. 5 in the form of wide confidence intervals. The high values of the coefficient of variation (Table 2) in the case of A. sylvaticus also suggest the inaccuracy of the population estimates. A. sylvaticus with its low capture numbers did not satisfy the conditions of the JOLLY programme, while in the other three species coefficients of variation with values always remaining below 20% are acceptable for each period. Table 2. Coefficient of variation (cv[%]) of population size estimates of four rodent species in 1997, based on the D-model 1997/Months A. flavicollis A. sylvaticus A. agrárius C. glareolus March 12.19 45.54 14.37 8.82 April 11.57 36.91 17.80 7.98 May 9.64 33.90 17.41 8.54 June 8.76 33.48 16.69 7.51 July 8.26 30.43 16.12 6.64 August 8.40 31.26 14.44 6.78 September 7.79 27.16 11.67 6.69 October 8.00 28.39 11.51 6.82 November 11.25 32.42 16.95 8.23 Daily capture and trappability Wooden and plastic traps did not differ significantly in their capture results in either of the trapping periods and in respect of any of the captured species (Tables 3 & 4). Accordingly, the two types of traps operated approximately with identical efficiency in both periods, implying that their mixed use did not cause erroneous sampling. Table 3. x 2-test of the trapping capacity of the two trap types in 1995-1996, by species Species Number of captures Number of captures Total number of ^-values Significance in plastic traps in wooden traps captures A. flavicollis 153 126 279 20.85 ns A. sylvaticus 30 42 72 19.28 ns A. agrárius 358 284 642 21.69 ns C. glareolus 85 77 162 8.14 ns Table 4. X 2-test of the trapping capacity of the two trap types in 1997, by species Species Number of Number of Total number of X 2-values Significance captures in plastic captures in wooden captures traps traps A. flavicollis 553 524 1077 11.75 ns A. sylvaticus 53 49 102 6.65 ns A. agrárius 506 481 987 21.3 ns C. glareolus 440 473 913 8.36 ns
