|Dispersion of gastrotricha in a marine beach of the San Juan Archipelago, Washington|
Hummon, W.D. (1972). Dispersion of gastrotricha in a marine beach of the San Juan Archipelago, Washington. Mar. Biol. (Berl.) 16(4): 349-355
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Gastrotricha were quantitatively sampled at low tide on several dates from two transeets at Eagle Cove, San Juan Island, Washington, USA, during the summers of 1963/1964. They showed low species diversity and very high whole-beach densities. Chaetonotus testiculophorus Hummon, 1966 and Turbanella cornuta Remane, 1925 were found abundantly, Paraturbanella intermedia Wieser, 1957 only rarely. Abundant C. testiculophorus were found above 100 cm elevation; T. cornuta occurred abundantly in a rip-channel trough and in the lower beach area. T. cornuta, but not C. testiculophorus, showed significantly greater clumping at high than at low density. Curves of LC90 temperature-salinity tolerance for both species show that they tolerate widely fluctuating temperatures and salinities. Causes of whole-beach distribution patterns are discussed.