The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Stephen J Obrien - One of the best experts on this subject based on the ideXlab platform.
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Population Characteristics of dna fingerprints in humpback whales megaptera novaeangliae
Journal of Heredity, 1993Co-Authors: C. S. Baker, John Calambokidis, Dennis A Gilbert, M T Weinrich, R H Lambertsen, B Mcardle, G K Chambers, Stephen J ObrienAbstract:Humpback whales exhibit a remarkable social organization that is characterized by seasonal long-distance migration (> 10,000 km/year) between summer feeding grounds in high latitudes and winter calving and breeding grounds in tropical or near-tropical waters. All Populations are currently considered endangered as a result of intensive commercial exploitation during the last 200 years. Using three hypervariable minisatellite DNA probes (33.15, 3'HVR, and M13) originally developed for studies of human genetic variation, we examined genetic variation within and among three regional subPopulations of humpback whales from the North Pacific and one from the North Atlantic oceans. Analysis of DNA extracted from skin tissues collected by biopsy darting from free-ranging whales revealed considerable variation in each subPopulation. The extent of this variation argues against a recent history of inbreeding among humpback whales as a result of nineteenth- and twentieth-century hunting. A canonical variate analysis suggested a relationship between scaled genetic distance, based on similarities of DNA fingerprints, and geographic distance (i.e., longitude of regional subPopulation). Significant categorical differences were found between the two oceanic Populations using a multivariate analysis of variance (MANOVA) with a modification of the Mantel nonparametric permutation test. The relationship between DNA fingerprint similarities and geographic distance suggests that nuclear gene flow between regional subPopulations within the North Pacific is restricted by relatively low rates of migratory interchange between breeding grounds or assortative mating on common wintering grounds.
Dongsheng Yu - One of the best experts on this subject based on the ideXlab platform.
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Clonal architecture and ramet Population Characteristics of Lysimachia congestiflora growing under different light conditions
Journal of Applied Ecology, 2004Co-Authors: Chen J, Ming Dong, Dongsheng YuAbstract:The response of clonal architecture and ramet Population Characteristics to resource heterogeneity is of great ecological significance.This paper studied the variations of clonal architecture and ramet Population Characteristics of stoloniferous herb Lysimachia congestiflora growing at the open land of forest edge,forest edge,and forest understory of evergreen broad-leaved forest in Mt.Lingyan of Dujiangyan,Sichuan Province,and compared the stolon internode length,frequency distribution of stolon internode length,braching intensity,branching angle,frequency distribution of branching angle,ramet Population density,ramet Population height,ramet Population biomass,and root/shoot of ramet Population among the three habitats.The results showed that the stolon internode length,branching intensity,ramet Population density and ramet Population biomass were different among three habitats.Kruskal Wallis test indicated that the distributions of stolon internode length and branching angle were significantly different among three habitats.The skewness in distribution of stolon internode length was in the order of open land of forest edgeforest edgeforest understory;and the branching angle,ramet Population height,and root/shoot of ramet Population were significant greater in open land of forest edge than in forest edge and forest understory.The skewness in distribution of branching angle in open land of forest edge was smaller than that in forest edge and forest understory.The branching angle,ramet Population height,and root/shoot of ramet Population were not significantly different between forest edge and forest understory.These results were discussed in the context of resource acquisition strategy by clonal plants.
C. S. Baker - One of the best experts on this subject based on the ideXlab platform.
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Population Characteristics of dna fingerprints in humpback whales megaptera novaeangliae
Journal of Heredity, 1993Co-Authors: C. S. Baker, John Calambokidis, Dennis A Gilbert, M T Weinrich, R H Lambertsen, B Mcardle, G K Chambers, Stephen J ObrienAbstract:Humpback whales exhibit a remarkable social organization that is characterized by seasonal long-distance migration (> 10,000 km/year) between summer feeding grounds in high latitudes and winter calving and breeding grounds in tropical or near-tropical waters. All Populations are currently considered endangered as a result of intensive commercial exploitation during the last 200 years. Using three hypervariable minisatellite DNA probes (33.15, 3'HVR, and M13) originally developed for studies of human genetic variation, we examined genetic variation within and among three regional subPopulations of humpback whales from the North Pacific and one from the North Atlantic oceans. Analysis of DNA extracted from skin tissues collected by biopsy darting from free-ranging whales revealed considerable variation in each subPopulation. The extent of this variation argues against a recent history of inbreeding among humpback whales as a result of nineteenth- and twentieth-century hunting. A canonical variate analysis suggested a relationship between scaled genetic distance, based on similarities of DNA fingerprints, and geographic distance (i.e., longitude of regional subPopulation). Significant categorical differences were found between the two oceanic Populations using a multivariate analysis of variance (MANOVA) with a modification of the Mantel nonparametric permutation test. The relationship between DNA fingerprint similarities and geographic distance suggests that nuclear gene flow between regional subPopulations within the North Pacific is restricted by relatively low rates of migratory interchange between breeding grounds or assortative mating on common wintering grounds.
Foy, Joseph P. - One of the best experts on this subject based on the ideXlab platform.
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Selected Population Characteristics of smallmouth bass and rock bass in a three county area of the West Fork of the White River, Indiana from 1991-1994
2000Co-Authors: Foy, Joseph P.Abstract:Several Population Characteristics were calculated for smallmouth bass Micropterus dolomieui and rock bass Ambloplites rupestris Populations on the west fork of the White River in Randolph, Delaware, and Madison counties, Indiana and were compared to other Populations. When compared to streams of similar size in Indiana that were sampled with the same methods, relative abundance (CPUE) of smallmouth bass was average (18.9-35.0 fish/hour) while rock bass were two to ten times more abundant (44.3-53.0 fish/hour). Age analysis and back calculation of length at age were only performed for smallmouth bass. These results indicated strong year classes were cyclical and smallmouth bass growth was above average for Indiana streams, but average for streams of the Midwest. Proportional stock density values were average for smallmouth bass (28-39%) and slightly below average for rock bass (17-33%). Strong weight-length models were also found for both species and relative weight values were optimal.Department of BiologyThesis (M.S.
Chen J - One of the best experts on this subject based on the ideXlab platform.
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Clonal architecture and ramet Population Characteristics of Lysimachia congestiflora growing under different light conditions
Journal of Applied Ecology, 2004Co-Authors: Chen J, Ming Dong, Dongsheng YuAbstract:The response of clonal architecture and ramet Population Characteristics to resource heterogeneity is of great ecological significance.This paper studied the variations of clonal architecture and ramet Population Characteristics of stoloniferous herb Lysimachia congestiflora growing at the open land of forest edge,forest edge,and forest understory of evergreen broad-leaved forest in Mt.Lingyan of Dujiangyan,Sichuan Province,and compared the stolon internode length,frequency distribution of stolon internode length,braching intensity,branching angle,frequency distribution of branching angle,ramet Population density,ramet Population height,ramet Population biomass,and root/shoot of ramet Population among the three habitats.The results showed that the stolon internode length,branching intensity,ramet Population density and ramet Population biomass were different among three habitats.Kruskal Wallis test indicated that the distributions of stolon internode length and branching angle were significantly different among three habitats.The skewness in distribution of stolon internode length was in the order of open land of forest edgeforest edgeforest understory;and the branching angle,ramet Population height,and root/shoot of ramet Population were significant greater in open land of forest edge than in forest edge and forest understory.The skewness in distribution of branching angle in open land of forest edge was smaller than that in forest edge and forest understory.The branching angle,ramet Population height,and root/shoot of ramet Population were not significantly different between forest edge and forest understory.These results were discussed in the context of resource acquisition strategy by clonal plants.