The distribution and abundance of the interstitial acoel turbellarian,
Diatomovora amoena Kozloff, 1965 was studied in an
estuarine intertidal sand flat in Yaquina Bay, Oregon, from May
1970 through May 1971.
Monthly measurements of biological (organics, sulfides, chlorophyll,
and carotenoids), pore water (salinity, pH,oxygen, and temperature),
and sediment (fine sediment...
Righting behavior was examined in the asteroids Henricia
leviuscula and Leptasterias aequalis by repeating a standard laboratory
righting trial with a large number of individuals of each species,
and analyzing the observations made by statistical methods. Detailed
observations on the righting method, including leading pairs of
arms and righting time...
A 15-month field study was made on the reproductive cycles of
the prosobranch gastropods Nucella lamellosa, Nucella emarginata,
Searlesia dira and Amphissa columbiana on the Oregon coast.
Amphissa columbiaria and Searlesia dira were collected from Boiler
Bay, Nucella emarginata from Seal Rock and Nucella lamellosa
from inside Yaquina Bay.
All...
Along the central and southern Oregon coast and on San Juan Island, Washington, the lined chiton Tonicella lineata is very abundant in the lower intertidal levels on rocky shores. It is usually found on
encrusting coralline algae which, with epiphytic diatoms, make up the major portion of its diet. On...