Appendix A : Data

Table A-1. Years sampled and size of the sampling extent for sites included in the northern North Island bivalve surveys since 1999–2000. Surveys are ordered by site and year. The original and retained extent are areas in ha, density is listed as average number of cockles per m2, and the SE is the standard error of the density. The retained extent and strata list the area and strata retained for analysis after manual parsing to assure comparability of surveys through time.