A hierarchical sampling design was used to describe scales of genetic structuring of Hediste diversicolor (Polychaeta: Nereididae) along the North Adriatic coast of Italy and to investigate possible relationships with patterns of heavy metal contamination. Analyses of a fragment of the mitochondrial COI gene revealed yielded ten different haplotypes. These results showing that, in the North Adriatic sea, H. diversicolor is characterised by high levels of genetic diversity at this mitochondrial gene and that the genetic structuring at this locus may beis more complex than previously hypothesised. Both COI and allozyme data show suggest that most of the total genetic variance is due to genetic differentiation 1)(1) among sites within estuaries and (2) among individuals within sites. These results suggest that, within estuaries, H. diversicolor does not form contiguous, panmictic populations, but rather is structured in fragmented populations that are isolated at small spatial scales. Sediment Concentrations concentrations of Zinnc, Copper Cu and, Nickel in sediments were above effects range-low (ERL) guideline values at several of the investigated sites (1, 2, and 12 sites out of 15, respectively). Regardless expectations of biological effects promoted by heavy metal stressYet, we did not observe any relationships between either heavy metal concentrations of metals and either the estimators of genetic diversity in H. diversicolor or the distribution of Aldolase genotypes expected from previous laboratory experiments. These results show suggest that, within North Adriatic estuaries, populations of H. diversicolor are structured by chaotic genetic patchiness and suggest that stochastic processes (e.g. genetic drift or sweepstake recruitment) have a major role in promoting small scale genetic structuring.

Mitochondrial DNA and allozyme patterns of Hediste diversicolor (Polychaeta: Nereididae): The importance of small scale genetic structuring / Virgilio M.; Backeljau T.; Abbiati M.. - In: MARINE ECOLOGY PROGRESS SERIES. - ISSN 0171-8630. - STAMPA. - 326:(2006), pp. 157-165. [10.3354/meps326157]

Mitochondrial DNA and allozyme patterns of Hediste diversicolor (Polychaeta: Nereididae): The importance of small scale genetic structuring

ABBIATI, MARCO
2006

Abstract

A hierarchical sampling design was used to describe scales of genetic structuring of Hediste diversicolor (Polychaeta: Nereididae) along the North Adriatic coast of Italy and to investigate possible relationships with patterns of heavy metal contamination. Analyses of a fragment of the mitochondrial COI gene revealed yielded ten different haplotypes. These results showing that, in the North Adriatic sea, H. diversicolor is characterised by high levels of genetic diversity at this mitochondrial gene and that the genetic structuring at this locus may beis more complex than previously hypothesised. Both COI and allozyme data show suggest that most of the total genetic variance is due to genetic differentiation 1)(1) among sites within estuaries and (2) among individuals within sites. These results suggest that, within estuaries, H. diversicolor does not form contiguous, panmictic populations, but rather is structured in fragmented populations that are isolated at small spatial scales. Sediment Concentrations concentrations of Zinnc, Copper Cu and, Nickel in sediments were above effects range-low (ERL) guideline values at several of the investigated sites (1, 2, and 12 sites out of 15, respectively). Regardless expectations of biological effects promoted by heavy metal stressYet, we did not observe any relationships between either heavy metal concentrations of metals and either the estimators of genetic diversity in H. diversicolor or the distribution of Aldolase genotypes expected from previous laboratory experiments. These results show suggest that, within North Adriatic estuaries, populations of H. diversicolor are structured by chaotic genetic patchiness and suggest that stochastic processes (e.g. genetic drift or sweepstake recruitment) have a major role in promoting small scale genetic structuring.
2006
Mitochondrial DNA and allozyme patterns of Hediste diversicolor (Polychaeta: Nereididae): The importance of small scale genetic structuring / Virgilio M.; Backeljau T.; Abbiati M.. - In: MARINE ECOLOGY PROGRESS SERIES. - ISSN 0171-8630. - STAMPA. - 326:(2006), pp. 157-165. [10.3354/meps326157]
Virgilio M.; Backeljau T.; Abbiati M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/40467
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