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 life cycle of a monogenean, Diclidophora sp., was studied
with special attention to the time required for developmental stages
to occur. Eggs are produced by adult worms at the rate of one every
13.5 minutes and require 32 days to hatch when incubated at 12.5°C
and 30.9‰ salinity. Rate...
The Bureau of Land Management (BLM) maintains a growing number of feral horses on public rangelands. With population growth rates as high as 22% annually, herds are exceeding their carrying capacity and millions of dollars are spent maintaining captured horses in holding facilities awaiting adoption. To manage the feral horse...
The Hemigrapsus oregonensis population at Coquille Point in
the Yaquina Bay Estuary on the Central Oregon Coast was studied
from April, 1972 through May, 1973. The population was found to be
vertically stratified from the 1 ft level to the 5 ft level. Population
densities were found to be most...
In situ salinity, turbidity and temperature were measured at discrete depths and water samples for radioanalysis were simultaneously collected in the Columbia River Estuary using a specially designed instrument package. Particulate radioactivity was concentrated by filtration and the dissolved radioactivity by evaporation or ferric oxide bulk precipitation. Radioanalysis was by...
The lack of first-hand experience or knowledge about
farming in the general population of the United States is a
concern among scientists as many current environmental
issues are strongly linked to agriculture. Developing
agricultural literacy and an appreciation for our dependance
on limited resources is important for preparing future
generations...
The genus Ormyrus has a worldwide distribution and
comprises about sixty recognized species. The higher
taxonomic relationships of the genus are uncertain, as
evidenced by its placement in the families Ormyridae,
Pteromalidae, or Torymidae. Here, the genus is described
in detail and a preliminary catalog of the world species
is...
Immunocontraception targeting the zona pellucida shows promise as a safe, effective and economically feasible method for controlling feral horse populations that roam public rangelands throughout the United States. The efficacy of porcine zona pellucida (pZP) vaccines to generate high titers can be evaluated with an indirect immunofuorescence assay or a...
Greenhouse-grown, September-harvested Lilium longiflorum cv. 'Nellie white' bulbs were used to determine temperature requirements during 5 pre-bloom and 1 post-bloom phases of development each of 1 month's duration. Plantes were subjected to 3 air temperatures(24°day/ 18°C night, 18°/13° and 13°/10°) in combination with soil temperatures at 30°, 24°, and equal...
The effects of several hormones and inducers of intracellular
messengers on plasminogen activator (PA) production and changes in
embryonic size by cultured bovine embryos were evaluated. Day 8 embryos
were cultured in Ham's F-12 with 1.5 mg/ml bovine serum albumin (BSA)
containing different levels of progesterone (P), estradiol -17fl (E₂),...