Genetic and morphometric variation of Mediterranean hake, Merluccius merluccius, in the Strait of Sicily (Central Mediterranean)

Marco Arculeo, Sabrina Lo Brutto, Nicolo' Parrinello, Bernardo Patti, Dino Levi, Pietro Rizzo

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5 Citazioni (Scopus)

Abstract

Allozyme, morphometric and growth analyses were applied to samples collected in the Strait of Sicily (central Mediterranean Sea) to test the hypothesis of the existence of a unique hake stock (Merluccius merluccius) in the study area. The level of genetic variation was detected from five polymorphic loci (ADH*, PGI-1*, PGI-2*, PGM*, SOD-1*). The average observed heterozygosity amounted to 0.421, while the average expected was 0.353. Weir &amp; Cockerham statistics showed no heterogeneity, except for the single PGI? locus (theta = 0.011; P < 0.05); the mean value was not significant (theta = 0.05; P > 0.05). Morphometric analyses revealed some differentiation. Females showed different relationships in six out of eight morphometric indices with total length, while the differences were significant for only four indices in males. Otolith readings also showed significant differences in growth rates of younger female specimens (age groups: 0-3 years) between the southwestern and northeastern parts of the Strait, whereas no clear variations were detected among males. These differences, conversely to genetic data, are probably related to the different environmental conditions characterizing the two sub-areas and give useful information for the management of this important resource.
Lingua originaleEnglish
pagine (da-a)165-170
Numero di pagine6
RivistaTHE ITALIAN JOURNAL OF ZOOLOGY
Volume71
Stato di pubblicazionePublished - 2004

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Merluccius merluccius
hake
Sicily
information management
loci
otoliths
Mediterranean Sea
allozymes
heterozygosity
superoxide dismutase
statistics
genetic variation
environmental factors
testing
sampling

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

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title = "Genetic and morphometric variation of Mediterranean hake, Merluccius merluccius, in the Strait of Sicily (Central Mediterranean)",
abstract = "Allozyme, morphometric and growth analyses were applied to samples collected in the Strait of Sicily (central Mediterranean Sea) to test the hypothesis of the existence of a unique hake stock (Merluccius merluccius) in the study area. The level of genetic variation was detected from five polymorphic loci (ADH*, PGI-1*, PGI-2*, PGM*, SOD-1*). The average observed heterozygosity amounted to 0.421, while the average expected was 0.353. Weir & Cockerham statistics showed no heterogeneity, except for the single PGI? locus (theta = 0.011; P < 0.05); the mean value was not significant (theta = 0.05; P > 0.05). Morphometric analyses revealed some differentiation. Females showed different relationships in six out of eight morphometric indices with total length, while the differences were significant for only four indices in males. Otolith readings also showed significant differences in growth rates of younger female specimens (age groups: 0-3 years) between the southwestern and northeastern parts of the Strait, whereas no clear variations were detected among males. These differences, conversely to genetic data, are probably related to the different environmental conditions characterizing the two sub-areas and give useful information for the management of this important resource.",
author = "Marco Arculeo and {Lo Brutto}, Sabrina and Nicolo' Parrinello and Bernardo Patti and Dino Levi and Pietro Rizzo",
year = "2004",
language = "English",
volume = "71",
pages = "165--170",
journal = "Italian Journal of Zoology",
issn = "1125-0003",
publisher = "Taylor and Francis Ltd.",

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TY - JOUR

T1 - Genetic and morphometric variation of Mediterranean hake, Merluccius merluccius, in the Strait of Sicily (Central Mediterranean)

AU - Arculeo, Marco

AU - Lo Brutto, Sabrina

AU - Parrinello, Nicolo'

AU - Patti, Bernardo

AU - Levi, Dino

AU - Rizzo, Pietro

PY - 2004

Y1 - 2004

N2 - Allozyme, morphometric and growth analyses were applied to samples collected in the Strait of Sicily (central Mediterranean Sea) to test the hypothesis of the existence of a unique hake stock (Merluccius merluccius) in the study area. The level of genetic variation was detected from five polymorphic loci (ADH*, PGI-1*, PGI-2*, PGM*, SOD-1*). The average observed heterozygosity amounted to 0.421, while the average expected was 0.353. Weir & Cockerham statistics showed no heterogeneity, except for the single PGI? locus (theta = 0.011; P < 0.05); the mean value was not significant (theta = 0.05; P > 0.05). Morphometric analyses revealed some differentiation. Females showed different relationships in six out of eight morphometric indices with total length, while the differences were significant for only four indices in males. Otolith readings also showed significant differences in growth rates of younger female specimens (age groups: 0-3 years) between the southwestern and northeastern parts of the Strait, whereas no clear variations were detected among males. These differences, conversely to genetic data, are probably related to the different environmental conditions characterizing the two sub-areas and give useful information for the management of this important resource.

AB - Allozyme, morphometric and growth analyses were applied to samples collected in the Strait of Sicily (central Mediterranean Sea) to test the hypothesis of the existence of a unique hake stock (Merluccius merluccius) in the study area. The level of genetic variation was detected from five polymorphic loci (ADH*, PGI-1*, PGI-2*, PGM*, SOD-1*). The average observed heterozygosity amounted to 0.421, while the average expected was 0.353. Weir & Cockerham statistics showed no heterogeneity, except for the single PGI? locus (theta = 0.011; P < 0.05); the mean value was not significant (theta = 0.05; P > 0.05). Morphometric analyses revealed some differentiation. Females showed different relationships in six out of eight morphometric indices with total length, while the differences were significant for only four indices in males. Otolith readings also showed significant differences in growth rates of younger female specimens (age groups: 0-3 years) between the southwestern and northeastern parts of the Strait, whereas no clear variations were detected among males. These differences, conversely to genetic data, are probably related to the different environmental conditions characterizing the two sub-areas and give useful information for the management of this important resource.

UR - http://hdl.handle.net/10447/4678

M3 - Article

VL - 71

SP - 165

EP - 170

JO - Italian Journal of Zoology

JF - Italian Journal of Zoology

SN - 1125-0003

ER -