woodpecker              package:popbio              R Documentation

_S_u_r_v_i_r_v_o_r_s_h_i_p _d_a_t_a _f_o_r _a_d_u_l_t _a_n_d _j_u_v_e_n_i_l_e _A_c_o_r_n _W_o_o_d_p_e_c_k_e_r_s

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

     Number of  juvenile and adult Acorn Woodpeckers and survival in
     the Water Canyon, New Mexico population, reconstructed from Stacey
     and Taper (1992).

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

     data(woodpecker)

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

     A data frame with 18 observations on the following 4 variables.

     '_r_a_t_e' Adult or juvenile stage

     '_y_e_a_r' Year

     '_s_t_a_r_t' Total number of starting individuals

     '_s_u_r_v' Number surviving to spring

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

     Stacey, P.B., and M. Taper. 1992. Environmentl variation and the
     persistence of small populations. Ecological Applications 2:
     18-29.

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

     Akcakaya, H. R. 2002. Estimating the variance of survival rates
     and fecundities. Animal Conservation 5: 333-336.

     Kendall, B. E. 1998. Estimating the magnitude of environmental
     stochasticity in survivorship data. Ecological Applications 8(1):
     184-193.

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

     'Kendall' and 'varEst'

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

     data(woodpecker)
     woodpecker
     ##stage-specific survival rate
     x<-aggregate(list(Nstart=woodpecker$start, Nsurv=woodpecker$surv),
     list(stage=woodpecker$rate), sum)
     x$survival<-x[,3]/x[,2]
     x

