The natural estrogen 17β-estradiol (E2) is responsible for the endocrine disruption and also has potential effect on the reproduction of vertebrate. However, its effect on invertebrate reproduction has scarcely been studied. The present study was conducted to determine the effect of E2 on survival, egg production and egg hatch of...
Published March 2004. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
4-H advancement programs consist of a series of steps that provide a framework for progressive learning within a specific project area. Advancement programs encourage 4-H members to learn at their own speed based on their interests and abilities. Advancement programs are self-paced, and age- and skill-level appropriate. Advancement programs can...
A 4-H dairy goat project will provide an opportunity for you to:
• Learn about breeds and how to select and judge dairy goats.
• Learn how to feed and care for your dairy goats.
• Learn responsibility by having animals of your own to care for regularly.
• Appreciate...
The Beginning Level of food preservation is for members of any age who are just starting the project. You might spend up to 3 years in this level as you learn the basic procedures and try the different methods.
Members who have complete the Beginning and Expanding levels of the 4-H Food Preservation project are ready for the Advanced Level. There are numerous activities for you to explore.
Record for 4-H horse project. Revised May 2004. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
This study is aimed at evaluating the effectiveness of buyback program implemented last during a 10-year period using a bioeconomic model. Aggregate fisheries stocks are assessed by the surplus-production model and standardized aggregate harvest function is used in the bioeconomic model. The simulation result indicate that the fish stocks are...
A bioeconomic model allowing different degrees of harvesting closures for two sub-stocks consisting of mature and immature fish is presented. Hence the model opens for partial closures of fisheries on both sub-stocks. Migration between the two sub-stocks is defined as recruitment of the young to the mature sub-stock, and egg...
Scallop fisheries are often characterized by variable abundance and periodic mass mortality occurrences. Area rotation is a respected management tool for sedentary species. A bioeconomic simulation model that incorporates the spatial and temporal distribution of scallop beds and fishing effort is presented. The model is user-friendly and was designed for...
This publication is designed to help you learn more about agricultural cooperatives or to help you think through the process of organizing and
operating such a business. While the focus is on creating a new
cooperative, many of the ideas may be of interest to those thinking
about reorganizing or...
We focus on problems of access to marine sites for aquaculture in different countries, particularly in Maine, U.S.A. and Canada. The main question examined is how public natural goods (marine space) are allocated for aquaculture activities. Using ideas from law and economics, as well as institutional economics, we looked at...
We compare the oceanic circulation patterns over the
Southwestern Atlantic Shelf (SWAS) forced by nine
different wind stress climatologies. The largest differences
are observed in experiments forced with the Hellerman
and Rosenstein [1983, hereafter HR83] and Trenberth
et al. [1990, hereafter TR90] winds. HR83 shows a
general northeastward flow near...
A high prevalence of vertebral deformities has been observed in various fishes, especially cyprinids, from certain regions of the Willamette River for many years. One proposed source of these deformities is exposure to toxicants. Histological evaluation of affected chiselmouth Acrocheilus alutaceus revealed that all lesions associated with vertebrae were associated...
The primary purpose of this Guide is to encourage private landowners to conserve, and when appropriate, actively manage Oregon white oaks that already exist on their property, and consider planting additional oaks. In the early chapters of the Guide, we describe some of the uses and benefits of this remarkable...
The fishery cooperative association of Akita Prefecture closed the sailfin sandfish Arctoscopus japonicus fisheries from 1992 to 1994 to rehabilitate the stock. Following the temporary closure, the total allowable catch (TAC) has gradually increased. The aim of this study is to evaluate the effects of the fishery moratorium and other...
The propagation of incident coastal-trapped waves in the Gulf of California is investigated using a hydrostatic
primitive equation model. The behavior of idealized incident wave disturbances with different amplitudes and
time scales is examined. The incident wave disturbances propagate northward up-gulf along the east side with
no significant change. At...
Scientists explore the effects of tree buffers along creek banks on both grazing land and stream ecology. Featuring Dr. Badege Bishaw, Dr. Bill Emmingham, and Dr. Bill Rogers.
This article analyzes the barotropic circulation in the Southwestern Atlantic Shelf using
a three-dimensional numerical model forced with winds and tides. South of 40°S, the shelf
circulation is dominated by the propagation of the semidiurnal tides. In this region the
diurnal tides are generally weak, except at the shelf edge...
This paper introduces the even-odd POMDP an approximation to POMDPs Partially Observable Markov Decision Problems in which the world is assumed to be fully observable every other time step. This approximation works well for problems with a delayed need to observe. The even-odd POMDP can be converted into an equivalent...
Algal beds are a key component of coastal ecosystems. In terms of inshore fisheries, algal beds are important as: spawning grounds for fishes; habitats for fry; and sources of small prey animals for fishes. To maintain robust fish catches, it is considered worthwhile to maintain the functions of algal beds,...
We have measured the CO₂ concentration of air occluded during the last 40,000 years in the deep Siple Dome A (hereafter Siple Dome) ice core, Antarctica. The general trend of CO₂ concentration from Siple Dome ice follows the temperature inferred from the isotopic composition of the ice and is mostly...
Molds are an increasingly important issue for all building materials, including
wood. While washing with bleach is a commonly recommended method for removing
molds, and the associated discolorations, there is surprisingly little information on the
effectiveness of this treatment. The ability of mold removal treatments to brighten
wood and eliminate...
Abrupt transitions to strongly superrotating states have been found in some idealized models of the troposphere. These transitions are thought to be caused by feedbacks between the eddy momentum flux convergence in low latitudes and the strength of the equatorial flow. The behavior of an axisymmetric shallow-water model with an...
Soil acidification sometimes is necessary for optimum plant growth
west of the Cascade Mountain Range. Commercial producers of
blueberries, azaleas, rhododendrons, and other ornamentals may
need to reduce soil pH for optimum production.
Soil acidification is best performed prior to planting; it is much
more difficult in established plantings. No...