Twenty accessible rocky intertidal sites were selected to span the ‘kill-zone’ and peripheral locations (see list of sites in Jurgens et al. submitted). Two rocky intertidal areas were sampled per site, usually one on either side of the point of entry onto the beach and separated by approximately 100 m. We used quadrats (1m^2 [4 * 0.25 m^2] or 0.0625 m^2) and swaths (2 m wide transects) to estimate juvenile and adult abundance for each target species.
This data set includes abundances of Strongylocentrotus purpuratus (purple sea urchin) and their burrows on transects along the California coast from 37.9 N to 39.3 N.
Access Restriction: Access to these data are restricted until publication of the associated manuscript, which is currently in review at PLOS ONE. [2015-02-05]
Related Datasets:
Henricia counts
Purple urchin density by depth
Seastar and chiton counts - quadrats and swaths
CHIPS02 - seastar chiton urchin counts in quadrats
Gaylord, B., Dawson, M. N., Grosberg, R. K. (2014) Density of purple sea urchins along the California coast, 37.8 to 39.3 N: Andrew Molean State Park to Manchester State Park from 2005-2014 (CHIPS project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2014-12-20) Version Date 2014-12-20 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/541003 [access date]
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