Browsing Biology by Title
Now showing items 140-159 of 228
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The Oaks Experiments on Organic Management of Turf: Final Industry Report
(Edmonds Landscape and Construction Services Limited, Halifax, Nova Scotia, Canada., 1996-10-30)The Oaks experiments were designed to address practical questions about organic management of turfs (lawns, sports fields etc.), notably: (i) How do we use organic fertilizers and soil-building amendments on turf for maximum ... -
Observations on a mixed farm during the transition to biological husbandry
(2011-01-19)Tunwath is a mixed farm (laying hens-grains) located in the Annapolis Valley, Nova Scotia, in a cool humid temperate zone. It includes about 2100 laying hens, 35 hectares of field crops and additional garden, pasture, hay ... -
Observer Effects and Avian-Call-Count Survey Quality: Rare-Species Biases and Overconfidence
(2012-01)Wildlife monitoring surveys are prone to nondetection errors and false positives. To determine factors that affect the incidence of these errors, we built an Internet-based survey that simulated avian point counts, and ... -
On-farm measurements of pH, electrical conductivity and nitrate in soil extracts for monitoring coupling and decoupling of nutrient cycles
(Biological Agriculture & Horticulture, 1993) -
Otolith elemental composition and adult tagging reveal spawning site fidelity and estuarine dependency in rainbow smelt
(2008)Observations of homing and straying in marine organisms based on traditional Eulerian approaches may fail to resolve dispersal kernels or be unable to differentiate homing from invariant local residency, The roles of ... -
Overestimating Fish Counts by Non-Instantaneous Visual Censuses: Consequences for Population and Community Descriptions
(2010-07)Background: Increasingly, underwater visual censuses (UVC) are used to assess fish populations. Several studies have demonstrated the effectiveness of protected areas for increasing fish abundance or provided insight into ... -
Oxygen transport in egg masses of the amphibians Rana sylvatica and Ambystoma maculatum: Convection, diffusion and oxygen production by algae
(1994)Many amphibians lay their eggs in gelatinous masses up to 10-20 cm in diameter, posing problems for diffusive oxygen delivery. Oxygen may also be provided by water convection between eggs or by oxygen production by endogenous ... -
Pacific Salmon in Hot Water: Applying Aerobic Scope Models and Biotelemetry to Predict the Success of Spawning Migrations
(University of Chicago Press, P.O. Box 37005 Chicago IL 60637 USA, [mailto:help@press.uchicago.edu], [URL:http://www.journals.uchicago.edu/], 2008-12)Concern over global climate change is widespread, but quantifying relationships between temperature change and animal fitness has been a challenge for scientists. Our approach to this challenge was to study migratory ... -
Patch Dynamics of a Phytophagous Mite Population Effect of Number of Subpopulations
(1991)I conducted a field test of the hypothesis that the dynamics of a predator-prey interaction should be affected by the number of interacting subpopulations within an assemblage. I used a "successful" biological control ... -
Phylogenomic analysis of natural selection pressure in Streptococcus genomes
(2007-08)Background: In comparative analyses of bacterial pathogens, it has been common practice to discriminate between two types of genes: (i) those shared by pathogens and their non-pathogenic relatives (core genes), and (ii) ... -
Physical and biological factors influencing mussel (Mytilus trossulus, M. edulis) settlement on a wave-exposed rocky shore
(1996)Settlement rates of mussels Mytilus trossulus and M. edulis on artificial collectors (aquarium filter wool) and natural substrata were measured in tidepools and on emergent rock in recently ice-scoured and non-scoured ... -
Polar Bear Diets and Arctic Marine Food Webs: Insights from Fatty Acid Analysis
(2008-11)We used quantitative fatty acid signature analysis (QFASA) to examine the diets of 1738 individual polar bears (Ursus maritimus) sampled across the Canadian Arctic over a 30-year span. Polar bear foraging varied over ... -
Pollen limitation of plant reproduction: Ecological and evolutionary causes and consequences
(2004-09)Determining whether seed production is pollen limited has been an area of intensive empirical study over the last two decades. Yet current evidence does not allow satisfactory assessment of the causes or consequences of ... -
Population Structure as Revealed by mtDNA and Microsatellites in Northern Fur Seals, Callorhinus ursinus, throughout Their Range
(2010-05)Background: The northern fur seal (Callorhinus ursinus; NFS) is a widely distributed pinniped that has been shown to exhibit a high degree of philopatry to islands, breeding areas on an island, and even to specific ... -
Population-specific gene expression responses to hybridization between farm and wild Atlantic salmon
(2009-11)Because of intrinsic differences in their genetic architectures, wild populations invaded by domesticated individuals could experience population-specific consequences following introgression by genetic material of ... -
Positive Darwinian Selection in the Piston That Powers Proton Pumps in Complex I of the Mitochondria of Pacific Salmon
(2011-09)The mechanism of oxidative phosphorylation is well understood, but evolution of the proteins involved is not. We combined phylogenetic, genomic, and structural biology analyses to examine the evolution of twelve mitochondrial ... -
Potential for anthropogenic disturbances to influence evolutionary change in the life history of a threatened salmonid
(2008-05)Although evolutionary change within most species is thought to occur slowly, recent studies have identified cases where evolutionary change has apparently occurred over a few generations. Anthropogenically altered ... -
The Poverty of mathematical and existential truth: examples from fisheries science
(2011-06-27)Several years ago I suggested that the harvesting of our commercial fisheries could be improved if the non-falsifiable models of a fisheries science were to be replaced with the falsiable models of a fisheries economics. ... -
Predicting wave dislodgment of mussels: variation in attachment strength with body size, habitat, and season
(2001)Breaking waves impose large hydrodynamic forces which may dislodge mussels and other organisms living on exposed rocky shores. We examined the effect of variation in attachment strength with size, habitat and season on ... -
Preliminary observations of the status of shallow water reefs at Sandy Island, Carriacou, Grenada
(1996-10-29)Sandy Island is an uninhabited cay lying off the west coast of Carriacou. Surrounded by clear waters and coral reefs, with an extensive white sand beach and quiet water on its south side and a palm canopy on the island, ...