treepipit                package:coin                R Documentation

_T_r_e_e _P_i_p_i_t (_A_n_t_h_u_s _t_r_i_v_i_a_l_i_s) _F_o_r_e_s_t _D_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     Data on the population density of tree pipits in Franconian oak
     forests including variables describing the forest ecosystem.

_U_s_a_g_e:

     data(treepipit)

_F_o_r_m_a_t:

     A data frame with 86 observations describing 86 stands with  the
     following 10 variables:

     _c_o_u_n_t_s the number of tree pipits observed.

     _a_g_e the ages of the overstorey oaks taken from forest data.

     _c_o_v_e_r_s_t_o_r_e_y percentage of cover of canopy overstorey. The crown
          cover is described relative to a fully stocked stand. Very
          dense overstorey with multiple  crown cover could reach
          values greater than 100 percent.

     _c_o_v_e_r_r_e_g_e_n percentage of cover of regeneration and shrubs.

     _m_e_a_n_r_e_g_e_n mean height of regeneration and shrubs.

     _c_o_n_i_f_e_r_o_u_s percentage of coniferous trees.

     _d_e_a_d_t_r_e_e number of dead trees per grid.

     _c_b_p_i_l_e_s number of crowns and branch piles. All laying crowns and
          branch piles per hectare were  counted. These were induced by
          logging and the creation  of wind breaks.

     _i_v_y_t_r_e_e number of ivied trees. All ivied trees were counted per
          hectare.

     _f_d_i_s_t distance to the forest edge. The closest distance to the
          forest edge was measured  from the centre of each grid.

_D_e_t_a_i_l_s:

     This study is based on fieldwork conducted in three lowland oak
     forests in the Franconian region of northern Bavaria close to
     Uffenheim, Germany. Diurnal breeding birds were samples from March
     to  June 2002 five times, using a quantitative grid mapping. Each
     grid was a 1-ha square. In total, 86 sample sites weres
     established. All individuals were counted in time intervals of 7
     min/grid during slow walks along the middle of the grid with a
     stop in the  centre. Environmental factors were measured for each
     grid.

_R_e_f_e_r_e_n_c_e_s:

     J{\"o}rg M{\"u}ller and Torsten Hothorn (2004). Maximally Selected
     Two-Sample  Statistics as a new Tool for the Identification and
     Assessment of Habitat  Factors with an Application to Breeding
     Bird Communities in Oak Forests.  _Journal of Forest Research_,
     *123*, 219-228.

_E_x_a_m_p_l_e_s:

     data(treepipit, package = "coin")

     maxstat_test(counts ~ age + coverstorey + coverregen + meanregen +
                           coniferous + deadtree + cbpiles + ivytree,
                  data = treepipit)

