Distribution and abundance of intertidal sea urchins in South Africa

This dataset contains data described in the paper entitled
"Intertidal estimates of sea urchin abundance reveal congruence in
spatial structure for a guild of consumers". Data include: (1) counts
of intertidal sea urchins (Diadema cf. savignyi, Echinometra mathaei,
Parechinus angulosus, Stomopneustes variolaris, and Tripneustes gratilla)
made from 164 visits to 116 rocky shore sites across South Africa by six
different observers; (2) GPS co-ordinates determined for every 1-km
distance interval of the South African coastline starting from the mouth
of the Orange River at the border of South Africa and Namibia; and (3)
calculations of the amount of upstream and downstream rocky habitat from
surveyed sites.