Comparison of the karyotypes of the central and southern populations of the northern anchovy Engraufis mordax, girard 1854 (engraulidae, pisces)

Orozco, Yolanda Hornelas; Alcocer, M Uribe; Arenas, Virgilio; Jaimes, Píndaro Díaz; Morales, Néstor Valdés

doi:10.7773/cm.v22i3.859

Cited by 6 publications

(6 citation statements)

References 14 publications

(22 reference statements)

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“…1989, 1994; Hedgecock 1991, 1994; Diaz‐Jaimes et al . 1999) and karyotypes (Uribe‐Alcocer et al . 1996) have revealed shallow but significant subpopulation structure along the west coast of North America.…”

Section: Discussionmentioning

confidence: 99%

Living with uncertainty: genetic imprints of climate shifts in East Pacific anchovy (Engraulis mordax) and sardine (Sardinops sagax)

Grant²,

et al. 2004

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In the upwelling zone of the northeastern Pacific, cold nutrient-rich conditions alternate with warm nutrient-poor intervals on timescales ranging from months to millennia. In this setting, the abundances of Pacific sardine (Sardinops sagax) and northern anchovy (Engraulis mordax) fluctuate by several orders of magnitude, with sardine dominating during warm conditions and anchovy dominating during cool conditions. Two population models can explain the response of these fishes to adverse conditions. Under the basin model, species distributions contract to a central (optimal) range during population crashes. Expectations of this model may include a single range-wide population with a decline in genetic diversity on both sides of a central refuge. In contrast, the self-recruitment model invokes a series of local oceanographic domains that maintain semi-isolated subpopulations. During adverse conditions, some subpopulations cannot complete the life cycle within the local environment and are extirpated. Expectations of this model include some degree of population genetic structure and no clear gradient in genetic diversity. We examined mitochondrial DNA cytochrome b sequences to assess these competing models for anchovy (N = 196; 539 bp) and sardine (N = 107; 425 bp). The mitochondrial DNA gene genealogies are shallow but diverse for both species. Haplotype frequencies are homogeneous among subpopulations, but genetic diversities peak for both species along Baja California and adjacent southern California. Mismatch distributions and Tajima's D-values reveal distinctive signatures of population bottlenecks and expansions. Sardine haplotypes coalesce at approximately 241,000 years bp, with an initial female effective population size Nf0 = 0 followed by exponential growth to Nf1 = 115 million. Anchovy haplotypes coalesce at approximately 282,000 years bp, with an initial population size of Nf0 = 14,000, followed by exponential growth to Nf1 = 2.3 million. These results indicate a founder event for sardine and a severe population decline for anchovy in the California Current during the late Pleistocene. Overall, these data support the basin model on decadal timescales, although local recruitment may dominate on shorter timescales.

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Section: Discussionmentioning

confidence: 99%

Living with uncertainty: genetic imprints of climate shifts in East Pacific anchovy (Engraulis mordax) and sardine (Sardinops sagax)

Grant²,

et al. 2004

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“…En Puerto San Carlos, en noviembre de 1989, las muestras se obtuvieron de embarcaciones atuneras vareras. El número de individuos estudiados karyotypic comparison of the central and southern populations of the northern anchovy E. mordax has shown that the genetic diversification found in other studies is not reflected in a modification of the number nor the structure of chromosomes (Uribe-Alcocer et al, 1996).…”

Section: Materiales Y Métodosmentioning

confidence: 73%

“…The number of specimens studied from each sample appears in table 1. The justification of the collection sites for the samples of the central and southern populations is presented by Uribe-Alcocer et al (1996). Hemoglobin analysis required organisms to be collected live so that fresh blood can be extracted.…”

Section: Methodsmentioning

confidence: 99%

“…La población sureña ha sido la menos estudiada de las tres, particularmente desde el punto de vista genético. La comparación de los cariotipos de las poblaciones central y sureña de la anchoveta E. mordax ha mostrado, por otra parte, que la diversificación genética encontrada en otro estudios no se ha manifestado en la modificación en el número y en la estructura de los cromosomas (Uribe-Alcocer et al, 1996).…”

Section: Introductionunclassified

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Electrophoretic variation between the central and southern populations of the northern anchovy Engraulis mordax Girard 1854 (Engraulidae, Pisces) from Baja California, Mexico

Jaimes

Alcocer²,

Duval³

1999

Cienc. Mar.

Self Cite

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“…Although E. mordax has a high potential for gene flow because of its high dispersion, many studies have advocated the isolation of populations along the North American coast (e.g. Vrooman et al, 1981;Uribe-Alcocer et al, 1996). These results are corroborated by the findings of Spanikis et al (1989) and Bembo et al (1996) that reported genetic and morphometric differences in E. encrasicolus between the Aegean and Ionian Seas and between the Aegean and Tyrrhenian Seas.…”

Section: Discussionmentioning

confidence: 90%

Morphological divergence in the anchovy Anchoa januaria (Actinopterygii, Engraulidae) between tropical and subtropical estuarine areas on the Brazilian coast

et al. 2018

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Phenotypic differentiation among fish populations may be used for management of distinct stocks and helps in conserving biodiversity. We compared morphometric and meristic characters of the anchovy Anchoa januaria from shallow semi-closed bays between the south-eastern (Tropical, 23°S) and southern (Subtropical, 25°S) Brazilian coast. We hypothesized that differences between habitats and environmental conditions result in morphological divergence between conspecific populations. Fish size did not differ significantly between the two areas. Significant differences in the meristic and morphological characters were detected for individuals between the two areas, with specimens from the Subtropical region having significant larger head height, pectoral fin length and eye diameter compared with those from the Tropical region. Conversely, specimens from the Tropical region had significantly larger maxillary length, mouth length and body height than those from the Subtropical region. The number of rays for the dorsal and pectoral fins were higher for the specimens from the Subtropical region, whereas for the anal fin was higher for individuals from the Tropical region. Different morphological groups between the two regions were depicted by principal component analysis and discriminant function analysis, which suggest that morphological divergence is occurring. Local environmental influences and the lack of genetic interchange are likely to be the causes of such divergence. This is facilitated by the low tolerance of this species to marine waters that prevents connectivity between these stocks/populations.

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Comparison of the karyotypes of the central and southern populations of the northern anchovy Engraufis mordax, girard 1854 (engraulidae, pisces)

Cited by 6 publications

References 14 publications

Living with uncertainty: genetic imprints of climate shifts in East Pacific anchovy (Engraulis mordax) and sardine (Sardinops sagax)

Living with uncertainty: genetic imprints of climate shifts in East Pacific anchovy (Engraulis mordax) and sardine (Sardinops sagax)

Electrophoretic variation between the central and southern populations of the northern anchovy Engraulis mordax Girard 1854 (Engraulidae, Pisces) from Baja California, Mexico

Morphological divergence in the anchovy Anchoa januaria (Actinopterygii, Engraulidae) between tropical and subtropical estuarine areas on the Brazilian coast

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