Mitochondrial DNA Diversity and Population Structure in Marine Fish Species from the Gulf of Mexico

1994 ◽  
Vol 51 (S1) ◽  
pp. 205-214 ◽  
Author(s):  
John R. Gold ◽  
Linda R. Richardson ◽  
Carol Furman ◽  
Feng Sun
Keyword(s):  
Mitochondrial Dna ◽  
Gulf Of Mexico ◽  
Isolation By Distance ◽  
Red Drum ◽  
Red Snapper ◽  
Maximum Parsimony Analysis ◽  
Female Population ◽  
Mtdna Haplotypes ◽  
Haplotype Frequencies ◽  
Mtdna Haplotype

Variation in mitochondrial DNA (mtDNA) was examined among 693 red drum (Sciaenops ocellatus), 300 black drum (Pogonias cromis), and 421 red snapper (Lutjanus campechanus) sampled from several localities in the Gulf of Mexico. The number of mtDNA genotypes (haplotypes) observed were: 99 in red drum, 37 in black drum, and 68 in red snapper. Variation in mtDNA haplotype frequencies among localities in all three species was not significant, although two mtDNA haplotypes in black drum appeared to be clinally distributed. Maximum-parsimony analysis and phenetic clustering of mtDNA haplotypes and of samples in each species revealed little evidence of phylogeographic structuring. These data indicate that gene flow among localities in each species is sufficient to preclude genetic divergence. Spatial autocorrelation analysis of mtDNA haplotype frequencies revealed an isolation-by-distance effect in red drum and black drum, and indicated that migration between neighboring estuaries or bays in black drum may be less frequent than in red drum. Spatial autocorrelations in red snapper were negative in all distance classes, suggesting little migration even between adjacent localities. Differences in intrapopulational mtDNA diversities were found in all three species, suggesting that geographic differences in effective female population size may occur within each species.

Red Snapper: Ecology and Fisheries in the U.S. Gulf of Mexico

2007 ◽  
Keyword(s):  
Gulf Of Mexico ◽  
Allelic Variation ◽  
Isolation By Distance ◽  
Red Snapper ◽  
Significant Heterogeneity ◽  
Effective Population ◽  
Mt Dna ◽  
Protein Coding ◽  
Haplotype Variation ◽  
Mtdna Variants

<em>Abstract</em>.—Allelic variation at 19 nuclear-encoded microsatellite loci and haplotype variation in a 590 bp protein-coding fragment of mitochondrial (mt)DNA were assayed among Gulf red snapper sampled from four cohorts at each of three offshore localities (12 samples total) in the northern Gulf of Mexico. Significant heterogeneity in allele and genotype distributions among samples was detected at four microsatellites; six of seven ‘significant’ pairwise comparisons between samples revealed the heterogeneity to be temporal rather than spatial. Nested-clade analysis of mtDNA variants indicated different temporal episodes of range expansion and isolation by distance. Estimates of variance effective population size (microsatellites) ranged between ∼1,000 and >75,000 and differed significantly among localities. The differences in variance effective size likely reflect differences in number of individuals successfully reproducing or differences in patterns and intensity of migration. Collectively, these findings are consistent with the hypothesis that red snapper in the northern Gulf occur as a network (or metapopulation) of semi-isolated assemblages that may be demographically independent over the short term, yet over the long term can influence each other’s demographics via gene flow. This type of population structure may be difficult to detect with commonly used, selectively neutral genetic markers.

Heterogeneity in the Distribution of Mitochondrial DNA Haplotypes in Female Rainbow Trout Spawning in Different Seasons

1994 ◽  
Vol 51 (S1) ◽  
pp. 284-289 ◽  
Author(s):  
Roy G. Danzmann ◽  
Moira M. Ferguson ◽  
David M. Heculuck
Keyword(s):  
Mitochondrial Dna ◽  
Significant Heterogeneity ◽  
Temporal Heterogeneity ◽  
Commercial Fish ◽  
Mtdna Haplotypes ◽  
Hatchery Stock ◽  
Different Seasons ◽  
Spawning Time ◽  
The Government ◽  
Mtdna Haplotype

Analysis of females spawning throughout the year (October to late February) at a commercial fish farm in Ontario, revealed significant heterogeneity in the distribution of their mitochondrial DNA (mtDNA) haplotypes. These findings are consistent with previous data from this stock and indicate that female– daughter spawning times are temporally stable. This suggests a high maternal genetic contribution to this trait. Conversely, no temporal heterogeneity in the spawning times of females with different mtDNA haplotypes was observed in an unselected government (Ontario Ministry of Natural Resources) hatchery stock recently derived from a wild naturalized population. The government hatchery stock is normally spring spawning and has much higher levels of nucleon diversity compared with the cultured stock. Therefore, it appears that only a limited number of family lines within unselected stocks may show the propensity towards greatly accelerated spawning times. Furthermore, associations between spawning time and mtDNA haplotype may only become apparent following several generations of artificial selection.

Testing assumptions of otolith radiometric aging with two long-lived fishes from the northern Gulf of Mexico

2001 ◽  
Vol 58 (6) ◽  
pp. 1244-1252 ◽  
Author(s):  
M Scott Baker, Jr. ◽  
Charles A Wilson ◽  
Daniel L VanGent
Keyword(s):  
Gulf Of Mexico ◽  
Activity Ratio ◽  
Red Drum ◽  
Sciaenops Ocellatus ◽  
Red Snapper ◽  
Great Promise ◽  
Lutjanus Campechanus ◽  
Northern Gulf Of Mexico ◽  
Elemental Analyses ◽  
Mass Increase

In this study, we evaluate the assumptions for estimating ages with radiometric and elemental analyses of otoliths of red snapper (Lutjanus campechanus) and red drum (Sciaenops ocellatus) from the northern Gulf of Mexico. In whole otoliths of both red snapper and red drum, 226Ra activity was inversely correlated with the otolith mass increase with age, validating the assumption that 226Ra accumulation in otoliths occurs at a rate proportional to that of Ca. 222Rn emanation from otoliths decreased as otolith mass increased. 222Rn loss occurred in all red snapper otolith samples ([Formula: see text]4.1%) and, to a lesser extent, in red drum otolith samples ([Formula: see text]0.6%) and decreased with increasing size (age) of the otolith. For red drum, the assumption that the initial activity ratio of 210Po to 226Ra in otoliths is essentially zero was indirectly validated with elemental analyses of Pb and Ba. Radiometric age estimation of shallow-water fishes from the northern Gulf of Mexico holds great promise, considering that 226Ra activities observed in this study are some of the highest recorded to date for species to which the 210Pb/226Ra dating technique has been applied.

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