DAO prepress abstract  -  doi: 10.3354/dao01917

ABSTRACT: The association of the scuticociliate Orchitophrya stellarum with three species of asteriid sea stars from the west coast of North America was studied, by flushing the gonopore region with seawater and spawning the seastars, along a latitudinal gradient of 2549 km between Pigeon Point, CA and Kodiak, AK. Asterias forbesii and A. rubens from the Isles of Shoals, NH were also sampled. The ciliate is found on the aboral surface of both sexes of reproductively ripe Evasterias troschelii, Leptasterias spp., and Pisaster ochraceus with a maximum intensity of association occurring at Cape Arago, OR and Clallum Bay and Manchester Dock, WA. A survey of gonad smears and hematoxylin and eosin stained sections documents that the ciliate is only present in males. Spring spawning E. troschelii and P. ochraceus are more negatively impacted by the ciliate than are winter spawning Leptasterias spp. as judged by a skewed sex ratio and sex size differences, which may be associated with seasonal differences in water temperature affecting the growth rate of O. stellarum. The external morphology of O.stellarum appears to be similar throughout the geographical range surveyed.