nematode               package:popbio               R Documentation

_P_o_p_u_l_a_t_i_o_n _d_e_n_s_i_t_i_e_s _f_o_r _t_h_e _s_u_g_a_r_b_e_e_t _c_y_s_t _n_e_m_a_t_o_d_e

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

     A time-series of population vectors for the sugarbeet cyst
     nematode _Heterodera schachtii_. Individuals were classified into
     three stages (J2, J3+J4, and adult) and densities (per 60 cc of
     soil) were averaged over four replicates, measured every two days,
     for 10 days. .

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

     data(nematode)

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

     A matrix listing densities from  3 stage classes over 6 time
     periods

_S_o_u_r_c_e:

     Used in Example 6.3 in Caswell (2001).

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

     Caswell, H. 2001. Matrix population models. Construction, Analysis
     and interpretation. 2nd ed. Sinauer, Sunderland, Massachusetts.

_S_e_e _A_l_s_o:

     'QPmat'

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

     data(nematode)
     stage.vector.plot(nematode, prop=FALSE, log='y', ylim=c(.3,200), 
      xlab="Time", ylab="Nematode density")

