Exhaustive map locations of tupelo trees sampled in bottomland forests

Shea et al (1993) studied the small-scale spatial patterning of water tupelo, a gynodioecious tree. Locations of all trees in 50m x 50m quadrats were mapped using compass and tape. By inspection of flowers in spring, each tupelo was classified as male, female, or juvenile (not flowering). The biological questions concern spatial segregation. Do males tend to occur in the vicinity of other males. Do females tend to occur in the vicinity of other females? There are two data sets: tupall.dat and wtrlvl.dat. The data (tupall.dat) are records of all water tupelo trees in 3 approx. 50 m x 50m plots in bottomland hardwood forests. They are formatted as plot, sex (F = 1, M = 2, or juvenile = 3), index number of nearest neighbor (If a tree 1 in a plot has NN of 185, tree 185 is it's NN), x and y (the spatial location in meters). Also available, but not used in the tests of spatial relationships are water depth data collected on a grid (wtrlvl.dat). These observations almost certainly include considerable measurement error and small scale spatial variation.