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...
Bimonthly plankton samples were collected from 1969 through
1971 along a transect off the central Oregon continental shelf (44°
39. l'N) to document the species of crab larvae present, their seasonality,
and their onshore-offshore distribution in relation to seasonal
changes in oceanographic conditions. A comprehensive key with
plates is given...
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...
Adula californiensis, which inhabits mudstone along the open
coast and in Yaquina Bay, Oregon, is subjected to extremely varying
conditions. Laboratory experiments of a factorial design were used
to investigate the effects of temperature and salinity on survival,
growth and respiration during early development.
The rate of development to the...
Zooplankton samples taken during daylight periods in a fast flushing estuary on the Central Oregon coast were analyzed for Brachyuran and Anomuran larvae and also for benthic gammaridean amphipods and Myscidacea. Several larval stages of Pinnixa littoralis, Hemigrapsus oregonensis, Pachycheles spp., Cancer oregonensis and Pagurus granosimanus were sufficiently abundant for...
During the Callianassa californiensis larval release period, weekly zooplankton samples were taken through daylight tidal cycles near the mouth of a small, fast flushing estuary on the Central Oregon coast. Although C. californiensis adults are confined to estuaries and embayments, stage I zoeal larvae were shown to be exported from...
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...
The primary objective of this study is to assess the Mexican experience in
managing coastal natural areas. The assessment is based on the categories, uses,
objectives, and political elements of Mexican protected coastal areas and governmental
efforts to develop and manage these areas. Specific problems within each protected
coastal area...
A two-year field study was made of a population of the California
Sea Mussel, Mytilus californianus, located on a protected tidal bench
at Yaquina Head on the Central Oregon Coast. This animal was
chosen because it is attached to the rocks, filters particulate matter
from the water, produces large amounts...
This investigation examined the community structure of two intertidal sedimentary environments on the Oregon coast in terms of species composition and vertical distribution.
A coring device was used to obtain samples from two levels above MLLW in each beach on four occasions. Of the 54 taxa found, 46.2% were crustaceans,...
The microdistribution of the amphipod Eohaustorius brevicuspis was
examined over a 19 month period. Field sampling was conducted principally
at Lost Creek State Park, Oregon, and on one occasion at Driftwood State
Park, Oregon. Both are high-energy, fine sand beaches which appear to be
uniform. Stratified random samples were taken...