Browsing Biology by Submit Date
Now showing items 41-60 of 228
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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) ... -
Prevalence and evolution of core photosystem II genes in marine cyanobacterial viruses and their hosts
(2006-08)Cyanophages ( cyanobacterial viruses) are important agents of horizontal gene transfer among marine cyanobacteria, the numerically dominant photosynthetic organisms in the oceans. Some cyanophage genomes carry and express ... -
Reduced Retinal Function in the Absence of Na(v)1.6
(2012-02)Background: Mice with a function-blocking mutation in the Scn8a gene that encodes Na(v)1.6, a voltage-gated sodium channel (VGSC) isoform normally found in several types of retinal neurons, have previously been found to ... -
The dystroglycan complex is necessary for stabilization of acetylcholine receptor clusters at neuromuscular junctions and formation of the synaptic basement membrane
(2001-02)The dystrophin-associated protein (DAP) complex spans the sarcolemmal membrane linking the cytoskeleton to the basement membrane surrounding each myofiber. Defects in the DAP complex have been linked previously to a ... -
Mechanisms Influencing the Timing and Success of Reproductive Migration in a Capital Breeding Semelparous Fish Species, the Sockeye Salmon
(University of Chicago Press, P.O. Box 37005 Chicago IL 60637 USA, [mailto:help@press.uchicago.edu], [URL:http://www.journals.uchicago.edu/], 2009)Two populations of homing sockeye salmon (Oncorhynchus nerka; Adams and Chilko) were intercepted in the marine approaches around the northern and southern ends of Vancouver Island (British Columbia, Canada) en route to ... -
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 ... -
Individual Variation in Migration Speed of Upriver-Migrating Sockeye Salmon in the Fraser River in Relation to Their Physiological and Energetic Status at Marine Approach
(University of Chicago Press, P.O. Box 37005 Chicago IL 60637 USA, [mailto:help@press.uchicago.edu], [URL:http://www.journals.uchicago.edu/], 2008)Little research has examined individual variation in migration speeds of Pacific salmon (Oncorhynchus spp.) in natural river systems or attempted to link migratory behavior with physiological and energetic status on a ... -
Entombed Plant-Communities Released by a Retreating Glacier at Central Ellesmere Island, Canada
(1984)No abstract available. -
Intense, Natural Pollution Affects Arctic Tundra Vegetation at the Smoking Hills, Canada
(1990-04)No abstract available. -
Survey of Vegetated Areas and Musk-Ox Populations in East-Central Ellesmere Island
(1986-03)No abstract available. -
Breeding Bird Surveys at Alexandra Fiord, Ellesmere Island, Nunavut (1980-2008)
(2010-09)Long-term monitoring of bird populations in the Arctic is of considerable interest as this area is experiencing rapid climate warming; however, multi-decadal studies in the Canadian High Arctic are rare. Over five summers ... -
Unveiling Interactions among Mitochondria, Caspase-Like Proteases, and the Actin Cytoskeleton during Plant Programmed Cell Death (PCD)
(2013-03)Aponogeton madagascariensis produces perforations over its leaf surface via programmed cell death (PCD). PCD begins between longitudinal and transverse veins at the center of spaces regarded as areoles, and continues ... -
Consequences of farmed-wild hybridization across divergent wild populations and multiple traits in salmon
(2010-06)Theory predicts that hybrid fitness should decrease as population divergence increases. This suggests that the effects of human-induced hybridization might be adequately predicted from the known divergence among parental ... -
Mixed evidence for reduced local adaptation in wild salmon resulting from interbreeding with escaped farmed salmon: complexities in hybrid fitness
(2008-08)Interbreeding between artificially-selected and wild organisms can have negative fitness consequences for the latter. In the Northwest Atlantic, farmed Atlantic salmon recurrently escape into the wild and enter rivers ... -
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 Influence of Operational Sex Ratio on the Intensity of Competition for Mates
(2011-02)The evolution and maintenance of secondary sexual characteristics and behavior are heavily influenced by the variance in mating success among individuals in a population. The operational sex ratio (OSR) is often used as ... -
Relative risks of inbreeding and outbreeding depression in the wild in endangered salmon
(2011-09)Conservation biologists routinely face the dilemma of keeping small, fragmented populations isolated, wherein inbreeding depression may ensue, or mixing such populations, which may exacerbate population declines via ... -
The Ecology of Atlantic Cod (Gadus morhua) in Canadian Arctic Lakes
(2011-06)The range of limnological conditions that support Atlantic cod populations in meromictic Arctic lakes is known to be relatively restricted. The degree to which differences in these features, particularly in the availability ... -
Avoidance of fisheries-induced evolution: management implications for catch selectivity and limit reference points
(2009-08)I examined how the fitness (r) associated with early-and late-maturing genotypes varies with fishing mortality (F) and age-/size-specific probability of capture. Life-history data on Newfoundland's northern Atlantic cod ... -
Concurrent habitat and life history influences on effective/census population size ratios in stream-dwelling trout
(2012-03)Lower effective sizes (Ne) than census sizes (N) are routinely documented in natural populations, but knowledge of how multiple factors interact to lower N-e/N ratios is often limited. We show how combined habitat and ...