scholarly journals Macro- and micro-geographic variation in pantophysin (PanI) allele frequencies in NE Atlantic cod Gadus morhua

2005 ◽  
Vol 301 ◽  
pp. 267-278 ◽  
Author(s):  
RAJ Case ◽  
WF Hutchinson ◽  
L Hauser ◽  
C Van Oosterhout ◽  
GR Carvalho
Keyword(s):  
Geographic Variation ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Allele Frequencies ◽  
Ne Atlantic

Geographic Variation in Atlantic Cod, Gadus morhua, off Eastern North America: A Biochemical Systematics Approach

1978 ◽  
Vol 35 (1) ◽  
pp. 117-123 ◽  
Author(s):  
T. F. Cross ◽  
R. H. Payne
Keyword(s):  
North America ◽  
Geographic Variation ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Allele Frequencies ◽  
Fish Stock ◽  
Eastern North America ◽  
The North ◽  
Stock Discrimination ◽  
Significant Difference

Analysis of geographic variation in the frequencies of alleles at the Tf locus in Atlantic cod, Gadus morhua, indicates that it is possible to distinguish three major populations off eastern North America: (1) north of the Laurentian Channel, (2) south of the Laurentian Channel, and (3) Flemish Cap. The data also suggest that the north Laurentian stock may be further subdivided into a northern and southern component. The genetic distinction between the cod population on Flemish Cap and those on other areas of the continental shelf is confirmed by a significant difference in allele frequencies at the PGI-2 locus. It is suggested that the cod population on Flemish Cap may have persisted in isolation since the last glaciation. Key words: fish stock discrimination, transferrin, phosphoglucose isomerase, allele frequencies, genetic distance

Historical analysis of Pan I in Atlantic cod (Gadus morhua): temporal stability of allele frequencies in the southeastern part of the species distribution

2007 ◽  
Vol 64 (10) ◽  
pp. 1448-1455 ◽  
Author(s):  
Einar Eg Nielsen ◽  
Brian R MacKenzie ◽  
Eydfinn Magnussen ◽  
Dorte Meldrup
Keyword(s):  
Species Distribution ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Temporal Stability ◽  
Historical Analysis ◽  
Allele Frequencies ◽  
Degraded Dna ◽  
Frequency Variation ◽  
Genetic Stock ◽  
Southeastern Part

We investigated temporal genetic differentiation at the pantophysin (Pan I) locus in four Atlantic cod (Gadus morhua) populations from the southeastern part of the species distribution: the Baltic Sea, the North Sea, the Faroe Plateau, and the Faroe Bank. Historical otolith collections enabled investigation of allele frequency variation over time periods up to 69 years employing Pan I primers specifically designed for partially degraded DNA. Small and nonsignificant temporal changes in Pan I allele frequencies were observed in the four populations. Simultaneous microsatellite analysis revealed similar temporal genetic stability with temporal FST values ranging from 0 to 0.006, suggesting limited demographic changes. Sea surface temperature, which has been suggested as the primary driver for the geographical distribution of Pan I alleles in cod, showed no long-term trend although temperature has increased since the mid-1990s. Our study demonstrates that populations in the southeastern part of the species range has been characterized by very high frequencies of the Pan IA allele for many decades, and accordingly, Pan I serves as a reliable marker for genetic stock identification on a macrogeographical scale.

scholarly journals Parallel adaptive evolution of Atlantic cod on both sides of the Atlantic Ocean in response to temperature

2010 ◽  
Vol 277 (1701) ◽  
pp. 3725-3734 ◽  
Author(s):  
Ian R. Bradbury ◽  
Sophie Hubert ◽  
Brent Higgins ◽  
Tudor Borza ◽  
Sharen Bowman ◽  
...  
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Spatial Scales ◽  
Geographic Distance ◽  
Marine Organisms ◽  
Allele Frequencies ◽  
Nucleotide Polymorphisms ◽  
Genome Survey ◽  
A Genome ◽  
Adaptive Diversity

Despite the enormous economic and ecological importance of marine organisms, the spatial scales of adaptation and biocomplexity remain largely unknown. Yet, the preservation of local stocks that possess adaptive diversity is critical to the long-term maintenance of productive stable fisheries and ecosystems. Here, we document genomic evidence of range-wide adaptive differentiation in a broadcast spawning marine fish, Atlantic cod ( Gadus morhua ), using a genome survey of single nucleotide polymorphisms. Of 1641 gene-associated polymorphisms examined, 70 (4.2%) tested positive for signatures of selection using a Bayesian approach. We identify a subset of these loci ( n = 40) for which allele frequencies show parallel temperature-associated clines ( p < 0.001, r 2 = 0.89) in the eastern and western north Atlantic. Temperature associations were robust to the statistical removal of geographic distance or latitude effects, and contrasted ‘neutral’ loci, which displayed no temperature association. Allele frequencies at temperature-associated loci were significantly correlated, spanned three linkage groups and several were successfully annotated supporting the involvement of multiple independent genes. Our results are consistent with the evolution and/or selective sweep of multiple genes in response to ocean temperature, and support the possibility of a new conservation paradigm for non-model marine organisms based on genomic approaches to resolving functional and adaptive diversity.

Geographic Variation in the Spawning of Atlantic Cod, Gadus morhua, in the Northwest Atlantic

1993 ◽  
Vol 50 (11) ◽  
pp. 2457-2467 ◽  
Author(s):  
Jeffrey A. Hutchings ◽  
Ransom A. Myers ◽  
George R. Lilly
Keyword(s):  
Continental Shelf ◽  
Geographic Variation ◽  
Relative Abundance ◽  
Coastal Waters ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Eastern Slope ◽  
Northwest Atlantic ◽  
Small Section ◽  
Eggs And Larvae

We analyzed 47 yr (1946–92) of research trawl data and 5 yr (1964–68) of research gillnet data to identify spawning locations of Atlantic cod, Gadus morhua, in the Newfoundland–Labrador region. Offshore, spawners are common on the continental shelf but generally rare on the slope. Relative abundance of spawning individuals on the shelf is comparably high off northeast Newfoundland, within 100 km of the Newfoundland coast from Cape Freels to Cape Race, on central Grand Bank, and on St. Pierre Bank. Slope spawning is largely restricted to the eastern slope of Hamilton Bank, a small section of northern Grand Bank, and Flemish Cap. Inshore spawning is evident in southeastern Labrador and southeastern Newfoundland, particularly in St. Mary's, Placentia, Trinity, and Bonavista bays. Trajectories of satellite-tracked drifter buoys indicate that it is highly improbable that eggs spawned on the slope of Grand Bank and much of the northeastern Newfoundland slope will be transported into shelf and coastal waters. We conclude that cod spawn in areas in which their eggs and larvae are likely to be retained and that inshore spawning populations may provide a considerably larger contribution to cod recruitment in coastal Newfoundland than has previously been believed.

Effects of temperature on life history set the sensitivity to fishing in Atlantic cod Gadus morhua

2014 ◽  
Vol 514 ◽  
pp. 217-229 ◽  
Author(s):  
HY Wang ◽  
LW Botsford ◽  
JW White ◽  
MJ Fogarty ◽  
F Juanes ◽  
...  
Keyword(s):  
Life History ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Effects Of Temperature

Responses of Atlantic cod Gadus morhua head kidney leukocytes to phytase produced by gastrointestinal-derived bacteria

2009 ◽  
Vol 36 (4) ◽  
pp. 883-891 ◽  
Author(s):  
Carlo C. Lazado ◽  
Christopher Marlowe A. Caipang ◽  
Sanchala Gallage ◽  
Monica F. Brinchmann ◽  
Viswanath Kiron
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Head Kidney

Some recent data on sperm morphology and motility kinetics in Atlantic cod (Gadus morhua L.)

2021 ◽  
Author(s):  
Sayyed Mohammad Hadi Alavi ◽  
Azadeh Hatef ◽  
Ian A.E. Butts ◽  
Olga Bondarenko ◽  
Jacky Cosson ◽  
...  
Keyword(s):  
Gadus Morhua ◽  
Sperm Morphology ◽  
Atlantic Cod

Natural mortality from poor condition in Atlantic cod (Gadus morhua)

2000 ◽  
Vol 57 (4) ◽  
pp. 826-836 ◽  
Author(s):  
Jean-Denis Dutil ◽  
Yvan Lambert
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Negative Impact ◽  
Fish Muscle ◽  
Early Summer ◽  
Wild Fish ◽  
Natural Mortality ◽  
Muscle Lactate ◽  
Lactate Dehydrogenase Activity ◽  
Poor Condition

The extent of energy depletion was assessed in Atlantic cod (Gadus morhua) in spring and early summer (1993-1995) to assess relationships between poor condition and natural mortality. Several indices of condition were compared in wild fish in the northern Gulf of St. Lawrence and in fish exposed to a prolonged period of starvation in laboratory experiments. Discriminant analyses classified only a small fraction of the wild fish as similar to cod that did not survive and a much larger fraction as similar to cod that survived starvation. This percentage increased from April to May and peaked in June 1993 and 1994. Condition factor and muscle somatic index allowed a clear distinction between live and dead fish. Muscle lactate dehydrogenase activity suggested that cod had experienced a period of negative growth early in 1993, 1994, and 1995. Fish classified as similar to starved individuals were characterized by a higher gonad to liver mass ratio than others. Reproduction may have a negative impact on survival not only in spring but also later into summer, as some individuals were found not to have recovered by late summer. This study shows that natural mortality from poor condition contributed to lower production in the early 1990s.

scholarly journals Gastrointestinal microbial community changes in Atlantic cod (Gadus morhua) exposed to crude oil

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Andrea Bagi ◽  
Even Sannes Riiser ◽  
Hilde Steine Molland ◽  
Bastiaan Star ◽  
Thomas H. A. Haverkamp ◽  
...  
Keyword(s):  
Microbial Community ◽  
Crude Oil ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Community Changes
Sign in / Sign up

Export Citation Format

Share Document