Mixed-conifer stands of grand fir (Abies grandis (Dougl. ex D. Don) Lindl., Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco), and ponderosa pine (Pinus ponderosa Dougl. ex Laws.) were fertilized with nitrogen and combination treatments of nitrogen, phosphorus, potassium, and sulfur to test their effects on trees and associated insects during...
While an abundance of research exists that looks at the impact that representatives’ backgrounds have on policy decisions, most of this research is focused on the areas of race and gender. As a result, there is a large gap in the literature that specifically looks at the impact that matters...
In many animal species, males direct more intense courtship towards females they have not previously encountered,
than towards females with which they have previously mated. To test the factors responsible for this "Coolidge Effect", we need
studies on a wide range of taxa – including those with mating systems in...
In some species, sperm is stored within the female reproductive tract for months to years, and yet remains viable to fertilize eggs and produce offspring. Female red-sided garter snakes store sperm for over seven months of winter dormancy. In previous work we demonstrated that these stored sperm account for an...
Polyandry is a source of sexual conflict and males often try to limit female promiscuity. Consequently, male manipulation of receptivity via antiaphrodisiacs and copulatory plugs that prevent female remating can be a source of sexual conflict. This sexual conflict may be intensified when females must remate for fertility insurance. Male...
Female sexual promiscuity is a prevalent element of mating systems. One consequence of female sexual promiscuity is that male‐male competition often continues post‐copulation within the female’s reproductive tract. According to theory, the number of sperm a male inseminates relative to his rivals strongly predicts his fertilization success. However, sperm quality...
In many undergraduate engineering programs, students do not synthesize content learned from multiple courses until a capstone senior design course. As an example, in undergraduate civil engineering programs, transportation engineering concepts (e.g., geometric alignment, asphalt design procedures) and geotechnical engineering concepts (e.g., shear strength of soils, soil compaction) are not...
The use of mechanized harvest equipment has been
increasing as an economical method to harvest small diameter
timber. While the use of this equipment is increasing,
little is known about associated soil compaction. In
particular, little information exists on soil compaction
caused by feller--bunchers.
This study measured soil compaction caused...