Helianthemum         package:ecespa         R Documentation(latin1)

_S_p_a_t_i_a_l _p_o_i_n_t _p_a_t_t_e_r_n _o_f _H_e_l_i_a_n_t_h_e_m_u_m _s_q_u_a_m_a_t_u_m _a_d_u_l_t _p_l_a_n_t_s _a_n_d _s_e_e_d_l_i_n_g_s

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

     Locations of _H. squamatum_ adult plants and seedlings in a 6 m x
     7 m plot over gypsum soil  in Chinchon (near Madrid, Spain). These
     are part of the data collected by Romao (2003) that have been
     analyzed several times (Escudero _et al._2005, De la Cruz 2006, De
     la Cruz et al. _in press._ ). The coordinates of the plans are
     given in cm.

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

     data(Helianthemum)

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

     An object of class "ppp"  of 'spatstat' representing the point
     pattern of plants locations marked by their type. See 'ppp.object'
      for details of the format.The dataset has 866 points with the
     following levels: 

     _a_d_u_l_t_H_S adult _H. squamatum_ plants

     _d_e_a_d_p dying _H. squamatum_ seedlings

     _s_u_r_v_p_l surviving _H. squamatum_ seedlings

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

     Romao, R.L. 2003. _Estructura espacial de comunidades de
     gipsofitos: interacciones bioticas y constricciones abioticas._
     Tesis Doctoral. Universidad Politecnica de Madrid.

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

     De la Cruz, M. 2006. Introduccion al analisis  de datos mapeados o
     algunas de las (muchas) cosas  que puedo hacer si tengo
     coordenadas. _Ecosistemas_ 15 (3): 19-39.  <URL:
     http://www.revistaecosistemas.net/pdfs/448.pdf>.

     De la Cruz, M., Romao, R.L.,  Escudero, A. and Maestre, F.T. 2008.
     Where do seedlings go? A spatio-temporal analysis of early
     mortality in a semiarid specialist. _Ecography_,31 DOI:
     10.1111/j.2008.0906-7590.05299 .

     Escudero, A., Romao, R.L., De la Cruz, M. & Maestre, F. 2005.
     Spatial pattern and neighbour effects on  _Helianthemum squamatum_
     seedlings in a Mediterranean gypsum community. _J. Veg. Sci._,
     *16*: 383-390.

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

     data(Helianthemum)
     plot(Helianthemum)

