Bivalve data (Legendre et al. 1997) used for example application.
Ecological Archives E086-041-S1.
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Brian S. Cade
Fort Collins Science Center, USGS
2150 Centre Avenue, Building C
Fort Collins, Colorado 80526
brian_cade@usgs.gov
Barry R. Noon
Department of Fishery and Wildlife Biology
Colorado State University
Fort Collins, Colorado 80523
Curtis H. Flather
Rocky Mountain Research Stations, USFS
2150 Centre Avenue, Building A
Fort Collins, Colorado 80526
The ASCII text data frame bivalve.txt contains 200 rows of observations corresponding to the 0.25 square meter sample plots on a 250 m × 500 m area on the sandflat of Wiroa Island, Manukau Harbor, New Zealand (data from Legendre et al. 1997). The 21 column variables are: LN.MACG15, logarithm of counts of Macomona >15 mm; MACG15, counts of Macomona >15 mm; ELEV.M, bed elevation in meters above chart datum; ELEV2, ELEV.M squared; ELEV3, ELEV.M cubed; X.CTR, longitude coordinates centered to mean 0; Y.CTR, latitude coordinates centered to mean 0; X2, X.CTR squared; XY, X.CTR multiplied by Y.CTR; Y2, Y.CTR squared; X3, X.CTR cubed; X2Y, X2 multiplied by Y.CTR; XY2, X.CTR multiplied by Y2; Y3, Y.CTR cubed; EBBSTRESS, ebb tide bed shear stress (N/m2); SWWAVEWORK, southwest wave work per unit of bed area (kg/s2); WSWWAVEWORK, west, southwest wave work per unit of bed area (kg/s2); WATER.G20CM, proportion of time the plot is covered by water >20 cm deep during spring tide (0 - 1); LRGWAVE.STIR, proportion of time large waves stir the plot during spring tide (0 - 1); FLDSTRESS, flood tide bed shear stress (N/m2); and SHELLHASH, bivalve shell hash (g) in the bed sediment. Missing values are indicated by NA.
Legendre, P., et al. 1997. Spatial structure of bivalves in a sandflat: scale and generating processes. Journal of Experimental Marine Biology and Ecology 216:99–128.
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