indspc                package:labdsv                R Documentation

_C_o_m_p_o_s_i_t_i_o_n_a_l _I_n_d_i_c_a_t_o_r _S_p_e_c_i_e_s _A_n_a_l_y_s_i_s

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

     Calculates the mean similarity of all plots in which a species
     occurs.

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

     indspc(veg,dis)

_A_r_g_u_m_e_n_t_s:

     veg: a data frame of taxa, samples as rows, species as columns

     dis: an object of class 'dist' from  'dist', 'vegist', or 
          'dsvdis'

_V_a_l_u_e:

     a data frame with species name, mean similarity, and number of
     occurrences

_N_o_t_e:

     One measure of the habitat specificity of a species is the 
     idegree to which a species only occurs in communities that are
     similar to each other.  This function calculates the mean
     similarity of  all samples in which each species occurs.  The mean
     similarity of species which only occur once is set as 0, rather
     than NA.

_A_u_t_h_o_r(_s):

     David W. Roberts droberts@montana.edu <URL:
     http://ecology.msu.montana.edu/labdsv>

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

     'duleg','duarm'

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

     data(bryceveg) # returns a vegetation dataframe
     dis.bc <- dsvdis(bryceveg,'bray/curtis')
         # returns a Bray/Curtis dissimilarity matrix
     indspc(bryceveg,dis.bc)

