Seagrass meadows at the extreme of environmental tolerance: the case of Posidonia oceanica in a semi-enclosedcoastal lagoon

Germana Di Maida, Maria Pirrotta, Sebastiano Calvo, Agostino Tomasello, Marco Borra, Maria Pirrotta, Germana Di Maida, Gabriele Procaccini, Sebastiano Calvo, Agostino Tomasello

Risultato della ricerca: Article

42 Citazioni (Scopus)

Abstract

Atoll-like structures of the endemic Mediterranean seagrass Posidonia oceanicawere encountered in the innermost area of the Stagnone di Marsala, a semienclosedcoastal lagoon along the western coasts of Sicily. The area is characterizedby limited water exchange with the open sea and by a marked seasonalvariation of water salinity and temperature, reaching beyond the theoretical tolerancelimits of the species. In the present study we determined the geneticcomposition of the atoll-like structures, as well as the growth performance andflowering rate of these stands. We also assessed whether and to what extent theatoll-like structures are genetically isolated from plants growing in meadowsoutside the lagoon. For this purpose we utilized 13 microsatellite markers togenotype single shoots sampled inside and outside the lagoon. Lepidochronologicalanalyses were performed on the same shoots to determine the annualrhizome growth rate, the number of leaves and the inflorescences formed as anestimate of growth- and reproductive performance over the years. The innermostarea of the lagoon showed a lower number of alleles, a lower percentageof polymorphic loci, a lower clonal diversity, but higher heterozygosis excesswith respect to the other areas analysed. Spatial autocorrelation was here significant,up to slightly below 300 m. Shoots collected in the atolls exhibited a25% lower vertical growth rate and 16% lower leaf formation in comparison tothose in open-sea meadows. No flowering events were recorded during 24 yearsof investigation, whereas inflorescences were observed frequently in meadowsoutside the lagoon. Results from Fst and factorial correspondence analysis confirmedthe expected genetic isolation of the confined atolls with respect to themeadows outside the lagoon and revealed limited gene flow within the lagoonitself. Apparently, the enclosed system of the Stagnone lagoon is genetically isolated,with a possible selection of genotypes adapted to persistent stressful conditions,consistent with reduced growth and lack of flowering events.
Lingua originaleEnglish
Numero di pagine13
RivistaMarine Ecology
Volume2009
Stato di pubblicazionePublished - 2009

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seagrass meadow
atolls
meadows
lagoon
tolerance
shoots
growth performance
inflorescences
flowering
Sicily
water salinity
autocorrelation
shoot
atoll
leaves
reproductive performance
gene flow
water temperature
microsatellite repeats
alleles

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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Seagrass meadows at the extreme of environmental tolerance: the case of Posidonia oceanica in a semi-enclosedcoastal lagoon. / Di Maida, Germana; Pirrotta, Maria; Calvo, Sebastiano; Tomasello, Agostino; Borra, Marco; Pirrotta, Maria; Di Maida, Germana; Procaccini, Gabriele; Calvo, Sebastiano; Tomasello, Agostino.

In: Marine Ecology, Vol. 2009, 2009.

Risultato della ricerca: Article

Di Maida, Germana ; Pirrotta, Maria ; Calvo, Sebastiano ; Tomasello, Agostino ; Borra, Marco ; Pirrotta, Maria ; Di Maida, Germana ; Procaccini, Gabriele ; Calvo, Sebastiano ; Tomasello, Agostino. / Seagrass meadows at the extreme of environmental tolerance: the case of Posidonia oceanica in a semi-enclosedcoastal lagoon. In: Marine Ecology. 2009 ; Vol. 2009.
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abstract = "Atoll-like structures of the endemic Mediterranean seagrass Posidonia oceanicawere encountered in the innermost area of the Stagnone di Marsala, a semienclosedcoastal lagoon along the western coasts of Sicily. The area is characterizedby limited water exchange with the open sea and by a marked seasonalvariation of water salinity and temperature, reaching beyond the theoretical tolerancelimits of the species. In the present study we determined the geneticcomposition of the atoll-like structures, as well as the growth performance andflowering rate of these stands. We also assessed whether and to what extent theatoll-like structures are genetically isolated from plants growing in meadowsoutside the lagoon. For this purpose we utilized 13 microsatellite markers togenotype single shoots sampled inside and outside the lagoon. Lepidochronologicalanalyses were performed on the same shoots to determine the annualrhizome growth rate, the number of leaves and the inflorescences formed as anestimate of growth- and reproductive performance over the years. The innermostarea of the lagoon showed a lower number of alleles, a lower percentageof polymorphic loci, a lower clonal diversity, but higher heterozygosis excesswith respect to the other areas analysed. Spatial autocorrelation was here significant,up to slightly below 300 m. Shoots collected in the atolls exhibited a25{\%} lower vertical growth rate and 16{\%} lower leaf formation in comparison tothose in open-sea meadows. No flowering events were recorded during 24 yearsof investigation, whereas inflorescences were observed frequently in meadowsoutside the lagoon. Results from Fst and factorial correspondence analysis confirmedthe expected genetic isolation of the confined atolls with respect to themeadows outside the lagoon and revealed limited gene flow within the lagoonitself. Apparently, the enclosed system of the Stagnone lagoon is genetically isolated,with a possible selection of genotypes adapted to persistent stressful conditions,consistent with reduced growth and lack of flowering events.",
keywords = "Coastal lagoon, Posidonia oceanica, environmental stress, genetic isolation, lepidochronology, microsatellites",
author = "{Di Maida}, Germana and Maria Pirrotta and Sebastiano Calvo and Agostino Tomasello and Marco Borra and Maria Pirrotta and {Di Maida}, Germana and Gabriele Procaccini and Sebastiano Calvo and Agostino Tomasello",
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T1 - Seagrass meadows at the extreme of environmental tolerance: the case of Posidonia oceanica in a semi-enclosedcoastal lagoon

AU - Di Maida, Germana

AU - Pirrotta, Maria

AU - Calvo, Sebastiano

AU - Tomasello, Agostino

AU - Borra, Marco

AU - Pirrotta, Maria

AU - Di Maida, Germana

AU - Procaccini, Gabriele

AU - Calvo, Sebastiano

AU - Tomasello, Agostino

PY - 2009

Y1 - 2009

N2 - Atoll-like structures of the endemic Mediterranean seagrass Posidonia oceanicawere encountered in the innermost area of the Stagnone di Marsala, a semienclosedcoastal lagoon along the western coasts of Sicily. The area is characterizedby limited water exchange with the open sea and by a marked seasonalvariation of water salinity and temperature, reaching beyond the theoretical tolerancelimits of the species. In the present study we determined the geneticcomposition of the atoll-like structures, as well as the growth performance andflowering rate of these stands. We also assessed whether and to what extent theatoll-like structures are genetically isolated from plants growing in meadowsoutside the lagoon. For this purpose we utilized 13 microsatellite markers togenotype single shoots sampled inside and outside the lagoon. Lepidochronologicalanalyses were performed on the same shoots to determine the annualrhizome growth rate, the number of leaves and the inflorescences formed as anestimate of growth- and reproductive performance over the years. The innermostarea of the lagoon showed a lower number of alleles, a lower percentageof polymorphic loci, a lower clonal diversity, but higher heterozygosis excesswith respect to the other areas analysed. Spatial autocorrelation was here significant,up to slightly below 300 m. Shoots collected in the atolls exhibited a25% lower vertical growth rate and 16% lower leaf formation in comparison tothose in open-sea meadows. No flowering events were recorded during 24 yearsof investigation, whereas inflorescences were observed frequently in meadowsoutside the lagoon. Results from Fst and factorial correspondence analysis confirmedthe expected genetic isolation of the confined atolls with respect to themeadows outside the lagoon and revealed limited gene flow within the lagoonitself. Apparently, the enclosed system of the Stagnone lagoon is genetically isolated,with a possible selection of genotypes adapted to persistent stressful conditions,consistent with reduced growth and lack of flowering events.

AB - Atoll-like structures of the endemic Mediterranean seagrass Posidonia oceanicawere encountered in the innermost area of the Stagnone di Marsala, a semienclosedcoastal lagoon along the western coasts of Sicily. The area is characterizedby limited water exchange with the open sea and by a marked seasonalvariation of water salinity and temperature, reaching beyond the theoretical tolerancelimits of the species. In the present study we determined the geneticcomposition of the atoll-like structures, as well as the growth performance andflowering rate of these stands. We also assessed whether and to what extent theatoll-like structures are genetically isolated from plants growing in meadowsoutside the lagoon. For this purpose we utilized 13 microsatellite markers togenotype single shoots sampled inside and outside the lagoon. Lepidochronologicalanalyses were performed on the same shoots to determine the annualrhizome growth rate, the number of leaves and the inflorescences formed as anestimate of growth- and reproductive performance over the years. The innermostarea of the lagoon showed a lower number of alleles, a lower percentageof polymorphic loci, a lower clonal diversity, but higher heterozygosis excesswith respect to the other areas analysed. Spatial autocorrelation was here significant,up to slightly below 300 m. Shoots collected in the atolls exhibited a25% lower vertical growth rate and 16% lower leaf formation in comparison tothose in open-sea meadows. No flowering events were recorded during 24 yearsof investigation, whereas inflorescences were observed frequently in meadowsoutside the lagoon. Results from Fst and factorial correspondence analysis confirmedthe expected genetic isolation of the confined atolls with respect to themeadows outside the lagoon and revealed limited gene flow within the lagoonitself. Apparently, the enclosed system of the Stagnone lagoon is genetically isolated,with a possible selection of genotypes adapted to persistent stressful conditions,consistent with reduced growth and lack of flowering events.

KW - Coastal lagoon

KW - Posidonia oceanica

KW - environmental stress

KW - genetic isolation

KW - lepidochronology

KW - microsatellites

UR - http://hdl.handle.net/10447/42227

M3 - Article

VL - 2009

JO - Marine Ecology

JF - Marine Ecology

SN - 0173-9565

ER -