Biology: Recent submissions
Now showing items 161-180 of 228
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Genomic islands of divergence and their consequences for the resolution of spatial structure in an exploited marine fish
(2013-04)As populations diverge, genomic regions associated with adaptation display elevated differentiation. These genomic islands of adaptive divergence can inform conservation efforts in exploited species, by refining the ... -
Why do fish stocks collapse? The example of cod in Atlantic Canada
(1997-02)In 1993, six Canadian populations of Atlantic cod (Gadus morhua) had collapsed to the point where a moratorium was declared on fishing. It has been argued that the collapses were caused by poor recruitment of cod to the ... -
Hybridization effects on phenotypic plasticity: experimental compensatory growth in farmed-wild Atlantic salmon
(2011-05)Compensatory growth (CG) is a means by which organisms can increase their growth rate above their routine growth rate after a period of environmentally induced growth depression. Despite a focus on the implications of ... -
Evolutionary and ecological feedbacks of the survival cost of reproduction
(2012-04)Arguably the most fundamental of trade-offs in life-history evolution is the increase in natural mortality resulting from sexual maturity and reproduction. Despite its central importance, this increase in mortality, a ... -
Individual variation in Atlantic salmon fertilization success: Implications for effective population size
(2002-02)Mating structure can influence the variance in individual reproductive success, which in turn has important implications for a population's effective size. Atlantic salmon (Salmo salar) males are characterized by alternative ... -
Life-history correlates of extinction risk and recovery potential
(2012-06)Extinction risk is inversely associated with maximum per capita population growth rate (r(max)). However, this parameter is not known for most threatened species, underscoring the value in identifying correlates of r(max) ... -
Consequences of sexual selection for fisheries-induced evolution: an exploratory analysis
(2008-02)Reproductive behaviour and mating system complexity may influence fisheries-induced evolution. Mate choice and intrasexual competition might favour late-, large-maturing genotypes in contrast to the selection imposed by ... -
Response: on the consequences of sexual selection for fisheries-induced evolution
(2008-11)No abstract available. -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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.