An Analysis of Morphometric Characters of Greenland Halibut (Reinhardtius hippoglossoides) in the Northwest Atlantic Using a Multivariate Analysis of Covariance

1988 ◽  
Vol 45 (4) ◽  
pp. 580-585 ◽  
Author(s):  
W. R. Bowering
Keyword(s):  
Multivariate Analysis ◽  
The State ◽  
Analysis Of Covariance ◽  
Greenland Halibut ◽  
Northwest Atlantic ◽  
Morphometric Characters ◽  
Davis Strait ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides

Eleven morphometric characters were measured on samples of Greenland halibut (Reinhardtius hippoglossoides) from eight different areas of high Greenland halibut abundance throughout the Northwest Atlantic from Davis Strait to the northern Grand Bank. These data were then analysed using a multivariate analysis of covariance technique with the aim of using the results to delineate Greenland halibut stocks throughout the study area. The results suggested that each area examined may very well support a separate stock. However, given the state of knowledge of this resource, this was not believed to be truly the case. Alternative explanations for the results are discussed.

Blood Protozoa as an Aid for Separating Stocks of Greenland Halibut, Reinhardtius hippoglossoides, in the Northwestern Atlantic

1982 ◽  
Vol 39 (9) ◽  
pp. 1317-1322 ◽  
Author(s):  
R. A. Khan ◽  
M. Dawe ◽  
R. Bowering ◽  
R. K. Misra
Keyword(s):  
Least Squares ◽  
South Coast ◽  
The South ◽  
Greenland Halibut ◽  
Northwest Atlantic ◽  
Davis Strait ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides

Samples of subadult Greenland halibut, Reinhardtius hippoglossoides, from several northwest Atlantic locations, the Gulf of St. Lawrence, and Fortune Bay, an inlet on the south coast of Newfoundland, were examined for the prevalence of two blood protozoa. Because prevalence of infection varied widely, the data were analyzed using the general least squares analysis of fitting constants on logit values. Trypanosome and piroplasm infections in samples from Davis Strait, NAFO divisions 2G–2H and div. 3L, were mostly similar, but differed significantly from div. 2J–3K. Trypanosome infections in samples from the northwest Atlantic locations were significantly higher than in the Gulf of St. Lawrence and Fortune Bay. Piroplasm infections were significantly higher in samples from Fortune Bay than in the Gulf of St. Lawrence. The results suggest that Greenland halibut from Davis Strait, div. 2G–2H and div. 3L, are composed of one stock complex, while fish from div. 2J–3K represent an isolated group or most probably a cline between areas. Greenland halibut from the Gulf of St. Lawrence and Fortune Bay appear to represent distinct stocks.Key words: blood protozoa, trypanosome, piroplasm, Greenland halibut, stock separation, northwestern Atlantic

Evidence supporting panmixia in Greenland halibut (Reinhardtius hippoglossoides) in the Northwest Atlantic

2014 ◽  
Vol 71 (5) ◽  
pp. 763-774 ◽  
Author(s):  
Denis Roy ◽  
David C. Hardie ◽  
Margaret A. Treble ◽  
James D. Reist ◽  
Daniel E. Ruzzante
Keyword(s):  
Population Structure ◽  
Population Genetic ◽  
Conservation Strategies ◽  
Greenland Halibut ◽  
Northwest Atlantic ◽  
Population Genetic Differentiation ◽  
Conservation Implications ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides ◽  
Species Specific

Assessment of population structure is critical to the design and implementation of sound management and conservation strategies. However, population structure must be assessed using markers attuned to population genetic processes such as genetic drift and gene flow, which reflect actual levels of reproductive isolation among putative genetic clusters. This is critical for highly exploited, commercial species that form the backbone of regional and local economies. Here, we show extremely low levels of population genetic differentiation among Greenland halibut (Reinhardtius hippoglossoides) collected from throughout the Northwest Atlantic, which cannot be statistically differentiated from panmixia using 12 species-specific polymorphic microsatellite markers. In contrast, some previous studies have demonstrated significant differences among individuals collected from various parts of the species’ range using a variety of both genetic and nongenetic techniques. In accordance with other reports and consistent with the species’ life history, we demonstrate that the most parsimonious explanation reconciling observed patterns is a repeated high degree of local differentiation of new recruits and colonizers originating from a common gene pool. Such a scenario has important conservation implications in terms of devising more appropriate strategies balancing species persistence and replenishment with sustainable resource use.

Biochemical Genetic Analysis of Population Differentiation in Greenland Halibut (Reinhardtius hippoglossoides) from the Northwest Atlantic, Gulf of St. Lawrence, and Bering Sea

1981 ◽  
Vol 38 (6) ◽  
pp. 669-677 ◽  
Author(s):  
Daphne J. Fairbairn
Keyword(s):  
Genetic Distance ◽  
Bering Sea ◽  
Greenland Halibut ◽  
Northwest Atlantic ◽  
Genotype Frequencies ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Biochemical Genetic ◽  
Reinhardtius Hippoglossoides ◽  
Subspecific Level ◽  
The Bering Sea

Greenland halibut (Reinhardtius hippoglossoides) from the Northwest Atlantic Ocean, the Gulf of St. Lawrence, and the Bering Sea were analyzed for allele and genotype frequencies at 16 electrophoretically detectable protein loci. Thirteen of these loci were monomorphic, with identical mobilities in all samples. One locus (MDH-1) was polymorphic only in the Bering Sea sample. Two loci, PGM and PHI-2, were polymorphic in all samples. An analysis of allele frequencies at these latter loci indicated that Greenland halibut from the Northwest Atlantic area form a single genetically homogeneous stock, but that those in the Gulf of St. Lawrence form a separate though not completely isolated stock. Greenland halibut from the Bering Sea differ greatly from these, and a genetic distance estimate based on all 16 loci suggested genetic divergence at the subspecific level between the two oceans.Key words: Greenland halibut, Reinhardtius hippoglossoides; biochemical genetic variation, electrophoresis, phosphoglucomutase, phosphohexose isomerase, genetic distance

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