186 FOOD PREFERENCES OF HEMIGRAPSUS NUDUS (DANA, 1851) (DECAPODA, GRAPSIDAE) ON SAN JUAN ISLAND, WASHINGTON, U.S.A. BY DOUGLASS W. BIRCH Department of Biological Sciences, University of Southern California, Los Angeles, California 90007, U.S.A. Hemigräpsus (Dana, 1 85 1 ) , the purple shore crab, is a commonly found inhabitant of marine and estuarine environments along the Pacific coast, ranging from mid-Alaska (Hart, 1968) to Punta Eugenio on the outer coast of Baja Cali- fornia (R. Brusca, pers. comm.), but its occurrence below Point Conception is rare (pers. obs.). The substrata upon which the crab is found range from rocky inter- tidal headlands, with relatively little fine sediment, to sediments of rock, sand and broken shell. It apparently does not inhabit areas with finer sediments (i.e., fine muds and gravels), where its congener H. oregonen.ri.r (Dana, 185 1 ) is typically found (Hiatt, 1948; Knudsen, 1964; Ricketts & Calvin, 1968). H. nuduJ co-occurs with P?tchy?rcrp.rzr.r crdssipeJ Randall, 1840, in rocky inter- tidal areas from Newport, Oregon, to the southernmost extent of its range. There is considerable overlap in the habitats of these two sympatric grapsoid crabs, with H. nudu.r tending to occupy lower intertidal elevations or areas with finer
Crustaceana – Brill
Published: Jan 1, 1979
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