The disposition of four therapeutically important antimicrobial agents
was studied in llamas following intravenous bolus administration. Six llamas were
each given ampicillin, tobramycin, trimethoprim and enrofloxacin at a dose of 12
mg/kg, 1 mg/kg, 3 mg/kg and 5 mg/kg of body weight with a wash out period
of 3 days...
Seasonally, in 1998 and 1999, I examined spatial and temporal variation in
fish assemblages of agricultural, forested, and acid mine drainage tributaries within
the Wayne National Forest (WNF) in southern Ohio. Land use and natural
disturbance explained patterns in stream fish assemblages. Creek chub and green
sunfish were present in...
I used a comparative and experimental approach to examine nest habitat
selection, reproductive success, and nest site fidelity of burrowing owls (Athene
cunicularia) in a large, non-fragmented grassland in southwest California. In 1999,
I compared habitat characteristics between nest sites (n = 31) and randomly
selected, unoccupied burrows (n =...
In cross-cultural studies, respondents from specific cultures may have
different product preferences and scale usage. Combining data from different
cultures will result in departures from the basic assumptions of analysis of variance
(ANOVA) and loss of power in testing capability of finding product and culture
differences. However, the result of...
I conducted acoustic lure surveys of northern pygmy-owls (Glaucidium gnoma) on
transects that were systematically placed in forested areas throughout the state of Oregon.
My objectives were to determine if pygmy-owls were associated with particular forest
types, ecoregions, or with large-diameter dominant overstory trees. I also examined
temporal variation in...
The purpose of this study was to investigate the primary factors
affecting colony size, reproductive success, and foraging patterns of
Double-crested Cormorants (Phalacrocorax auritus albociliatus) nesting at
East Sand Island in the Columbia River estuary, the largest colony of this
species on the Pacific Coast of North America. This colony...
Although widely studied in many portions of North America, little is known
about the specific habitat requirements of mallard ducks (Anas platyrhynchos) during
the breeding season in western Oregon. I radio-marked 72 female mallards in the
Willamette Valley of Oregon in March-April 1995-96 to document wetland habitat
selection during pre-nesting...
The ability to non-destructively assess fish condition and subsequently track fish behavior and survival can be vital in understanding natural and anthropogenic stressors and sources of mortality, especially in populations of fish listed as threatened or endangered. I investigated the use of a quick, non-lethal, external examination technique to assess...
Recent studies suggest that competition from brook trout (Salvelinus fontinalis; EBT) may have negative effects (e.g. displacement) on Lahontan cutthroat trout (Oncorhynchus clarki henshawi; LCT). Results from these studies have failed to elucidate the responsible mechanisms and have not examined if changing environmental conditions result in competitive/subordinate role reversals. The...
North American sagebrush (Artemisia spp.) ecosystems are suffering from
reductions in habitat extent and quality. Only about 50% of sagebrush remains
from pre-settlement conditions, and much of the remaining habitat is
fragmented or degraded by invasive species, fire suppression and overgrazing.
Sagebrush-obligate species are experiencing population declines as a result...