The presence of the etiologic agent of "salmon poisoning"
disease, Neorickettsia helminthoeca, was demonstrated in eggs of
the trematode vector, Nanophyetus salmincola. Three dogs were
given 100,000 and one dog 82,000 ground fluke eggs by intraperitoneal
injection. The four animals developed "salmon poisoning"
disease and died. One of these dogs...
Primary monolayer cultures of chick renal epithelial cells
grown on plastic coverslips were reversibly dissociated with the
chelating agent ethylenediaminetetraacetic acid (EDTA). The cellular
responses during dissociation and reaggregation in Hank's balanced
salt solution (BSS) were observed with phase optics and recorded
by time-lapse cinemicrography.
The epithelial cells grow as...
In recent years, studies dealing with temperature regulation,
temperature sensitivity, and physiological responses to temperature
in lizards and other reptiles have increased tremendously. It is
notable that snakes have been largely ignored in such studies. This
no doubt is due to their less direct relationship to ancestral endotherms.
However, problems...
This study investigated several physiological aspects of the
water economy of the Sage Sparrow, Amphispiza belli nevadensis,as
they relate to the ability of this species to inhabit xeric desert environments.
When maintained in captivity on a dry diet without
drinking water, Sage Sparrows gradually lost weight and died. During the...
Rhabdocoels of the genus Paravortex are parasites of marine
molluscs. The bent-nosed clams, Macoma nasuta(Conrad, 1837) of
Yaquina Bay, Lincoln County, Oregon are commonly infected with a new
species of Paravortex. The morphology of the adult worm has been
described and it has been compared to the other three species...
The syllid polychaete Autolytus varius reproduces in the spring
and early summer in Yaquina Bay, Oregon, The fertilized female
epitokes, or Sacconereis, carry the developing eggs and larvae in a
ventral sac until the larvae are ready to be released; incubation
lasts 14 to 18 days in the laboratory, The...
In freshwater the crayfish, Pacifasticus leniusculus, maintains
sodium balance by absorbing sodium against a large concentration
gradient. The site of uptake is the gills. The rate of uptake is
regulated and can be increased by depleting the animals of sodium
Neither the mechanism of sodium transport or the regulatory mechanism...
An investigation was undertaken to determine if respiratory
changes might occur in conjunction with migrations of the rough-skinned
newt, Taricha granulosa (Skilton) in and out of ponds in the
Willamette Valley. A field study was carried on from December
1964 through October 1965 to investigate certain physical and
chemical parameters...
Studies were conducted within a 12-mile radius of Camp Sherman, Oregon, in the Deschutes National Forest during the spring and summer of 1965 and the spring of 1966, with one follow-up visit in the summer of 1967. The feeding and foraging activities of Eutamias amoenus and Citellus lateralis were observed,...
Weight-specific oxygen consumption of intact bluegill sunfish
was estimated in relation to body weight and temperature by the
sealed jar method. The relationship between body weight and weight-specific oxygen consumption was represented by the equation: Y = aX[superscript b]⁻¹ in which Y is the weight-specific oxygen consumption, expressed
as cc/kg/hr,...
This study deals with the patterns of development and distribution
of connective tissue fibers in the placentae and adnexa of the golden
hamster (Mesocricetus auratus Waterhouse). The placentae and
adnexa representing all days of gestation from six to term were
stained for the presence of collagen, reticulin, and elastin. Additionally,...
The 13 species of shrimps studied for this thesis were collected
off the Oregon coast. The family Oplophoridae is well represented
in this area. Five of the seven known genera were identified.
Hymenodora frontalis, H. glacialis, and H. gracilis were described
and further differentiating characters were illustrated. Other members
of...
The morphology and taxonomic use of the reproductive tracts of some of the Pacific Northwest Pulmonates were studied. The snails examined were, Monadenia fidelis (Gray), Vespericola columbiana (Lea), Allogona townsendiana (Lea), Haplotrema sportella (Gould), and Haplotrema vancouverense (Lea). The length of the reproductive tracts of nine or more individuals of...
The morphology of a rather rare parasitic copepod was
studied. Ismaila monstrosa Bergh, an endoparasitic copepod was
found in the nudibranch, Antiopella fusca, at Coos Bay, Oregon.
Many anatomical features were found, which were different from
previous descriptions. Males were described for the first time.
Young males lacked the gonadal...
The female Philometra americana Ekbaum, 1933 is a common
subcutaneous parasite of the starry flounder, Platichthyes stellatus (Pallas) of Yaquina Bay, Lincoln County, Oregon. Maturation of this
worm produces noticeable red cysts subcutaneously between the fin
and tail rays and similarly on the operculum. The gravid female
penetrates the epidermis...
The acanthocephalan Echinorhynchus lageniformis Ekbaum,
1938, is a common intestinal parasite of the starry flounder, Platichthys
stellatus (Pallas), of Yaquina Bay, Lincoln Co., Oregon. Three
hundred and sixty-one flounders were examined and 146 (40.5 percent)
were found to harbor infections of E. lageniformis.
Cystacanths of E. lageniformis were found encysted...
The fish of Suttle Lake, Oregon, have been found to harbor
an acanthocephalan parasite, which lives attached to the mucosa of
the intestine. Between July 1961 and January 1963, several hundred of
these fish were exarnined and nearly every one was infected
with this parasite, which was identified as Neochinorhynchus...
The stages in the life history of the parasitic copepod Nectobrachia
indivisa Fraser, 1920, have been described.
The adult female lives permanently attached to the gills of the
starry flounder, Platichthys stellatus (Pallas, 1811) Girard, 1854.
The adult male is a dwarf, which usually lives attached to the genital
process...