Helianthemum {ecespa} | R Documentation |
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. 2007). The coordinates of the plans are given in cm.
data(Helianthemum)
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:
adultHS
deadpl
survpl
Romao, R.L. 2003. Estructura espacial de comunidades de gipsofitos: interacciones bioticas y constricciones abioticas. Tesis Doctoral Inedita. Universidad Politecnica de Madrid.
De la Cruz, M. 2006. Introduccion al analisis de datos mapeados o algunas de las (muchas) cosas que puedo hacer si tengo coordenadas. Ecosistemas. 2006/3. http://www.revistaecosistemas.net/articulo.asp?Id=488&Id_Categoria=1&tipo=portada.
De la Cruz, M., Romao, R.L. & Escudero, A. 2007. Where do seedlings go? A spatio-temporal analysis of early mortality in a semiarid specialist. Ecography, in revision.
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.
data(Helianthemum) plot(Helianthemum)