Results 181 to 190 of about 2,030 (202)
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Aquatic Conservation: Marine and Freshwater Ecosystems, 2021
Abstract Fishes with periodic life histories are long‐lived, slow to mature, and have intermittent periods of successful recruitment, limiting the ability of managers to recover their populations rapidly. Endangered razorback sucker (Xyrauchen texanus) in the Colorado River Basin, USA, is a periodic strategist whose persistence is largely dependent on
Tracy A. Diver +3 more
semanticscholar +2 more sources
Abstract Fishes with periodic life histories are long‐lived, slow to mature, and have intermittent periods of successful recruitment, limiting the ability of managers to recover their populations rapidly. Endangered razorback sucker (Xyrauchen texanus) in the Colorado River Basin, USA, is a periodic strategist whose persistence is largely dependent on
Tracy A. Diver +3 more
semanticscholar +2 more sources
Sampling properties of the heterozygote-excess estimator of the effective number of breeders
Conservation Genetics, 2010The effective number of breeders (N b) for a cohort of progeny can be estimated from an excess of heterozygotes that arises in progeny produced by finite numbers of parents. In principle, N b is a simple function of the standardized deviation (D) of the proportion of heterozygous progeny from its ...
A. Pudovkin +2 more
semanticscholar +2 more sources
Conservation Genetics, 2016
Monitoring short-term fluctuations in effective population sizes (N e) and effective number of breeders (N b), as well as their ratio to adult census population size (N e/N c and N b/N c), provide insight into ...
C. Perrier +4 more
semanticscholar +3 more sources
Monitoring short-term fluctuations in effective population sizes (N e) and effective number of breeders (N b), as well as their ratio to adult census population size (N e/N c and N b/N c), provide insight into ...
C. Perrier +4 more
semanticscholar +3 more sources
Journal of Fish Biology, 2018
This study assesses whether the effective number of breeders (Nb) can be estimated using a time and cost‐effective protocol using genetic sibship reconstruction from a single sample of young‐of‐the‐year (YOY) for the purposes of Atlantic salmon Salmo salar population monitoring. Nb was estimated for 10 consecutive reproductive seasons for S.
C. Bacles +5 more
semanticscholar +4 more sources
This study assesses whether the effective number of breeders (Nb) can be estimated using a time and cost‐effective protocol using genetic sibship reconstruction from a single sample of young‐of‐the‐year (YOY) for the purposes of Atlantic salmon Salmo salar population monitoring. Nb was estimated for 10 consecutive reproductive seasons for S.
C. Bacles +5 more
semanticscholar +4 more sources
Transactions of the American Fisheries Society, 2018
AbstractHatcheries are used as a conservation strategy to supplement native fish populations. Mating strategies used by hatcheries can employ different numbers of males and females, varying sex ratios, and different strategies to mix gametes. Due to sex ratio skew and variation in reproductive success, the effective number of breeders (Nb) contributing
M. Bartron, N. Sard, K. Scribner
semanticscholar +2 more sources
AbstractHatcheries are used as a conservation strategy to supplement native fish populations. Mating strategies used by hatcheries can employ different numbers of males and females, varying sex ratios, and different strategies to mix gametes. Due to sex ratio skew and variation in reproductive success, the effective number of breeders (Nb) contributing
M. Bartron, N. Sard, K. Scribner
semanticscholar +2 more sources
Conservation Genetics, 2008
Conservation programs that release captive-bred individuals into the wild to mix with naturally produced individuals are an increasingly common method of supporting or enhancing weak or reduced populations that otherwise may not be self-sustaining. Captive and supportive breeding can be important conservation tools for species with small or declining ...
J. Mclean +4 more
semanticscholar +2 more sources
Conservation programs that release captive-bred individuals into the wild to mix with naturally produced individuals are an increasingly common method of supporting or enhancing weak or reduced populations that otherwise may not be self-sustaining. Captive and supportive breeding can be important conservation tools for species with small or declining ...
J. Mclean +4 more
semanticscholar +2 more sources
The number of breeders explains genetic connectivity in an endangered bird
Molecular Ecology, 2019Connectivity is central to ecology and evolution as it focuses on the movement of individuals or genes across landscapes. Genetic connectivity approaches aim to understand gene flow but often estimate it indirectly based on metrics of genetic ...
Ellen P. Robertson +2 more
semanticscholar +1 more source
British Poultry Science, 1984
Semen from commercial breeder males was diluted two-fold and stored for 6 and 24 h at 2 to 3 degrees C. For each storage period, groups of caged dwarf broiler breeder hens from the same strain were inseminated with 300, 200 or 100 x 10(6) spermatozoa. Three replicates of 15 birds were inseminated per treatment.
openaire +2 more sources
Semen from commercial breeder males was diluted two-fold and stored for 6 and 24 h at 2 to 3 degrees C. For each storage period, groups of caged dwarf broiler breeder hens from the same strain were inseminated with 300, 200 or 100 x 10(6) spermatozoa. Three replicates of 15 birds were inseminated per treatment.
openaire +2 more sources
Nuclear Science and Engineering, 1976
The relative importance of energy redistribution by thermal conduction and sweep flow mixing in a wire-wrapped fuel assembly are quantitatively described at various Reynolds numbers. For a given bundle geometry, a critical Reynolds number exists below which thermal conduction appears to govern the temperature distribution within the bundle.
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The relative importance of energy redistribution by thermal conduction and sweep flow mixing in a wire-wrapped fuel assembly are quantitatively described at various Reynolds numbers. For a given bundle geometry, a critical Reynolds number exists below which thermal conduction appears to govern the temperature distribution within the bundle.
openaire +1 more source
2014
The use of genetic markers in monitoring populations has become increasingly important for conservation purposes, and can take many forms. While effective population size (Ne) is of great interest to conservation genetics, it may be much easier and more practical to estimate the effective number of breeders (Nb) per cohort as a tool for genetic ...
openaire +1 more source
The use of genetic markers in monitoring populations has become increasingly important for conservation purposes, and can take many forms. While effective population size (Ne) is of great interest to conservation genetics, it may be much easier and more practical to estimate the effective number of breeders (Nb) per cohort as a tool for genetic ...
openaire +1 more source