Posidonia oceanica in the Marmara Sea

Meinesz, A.; Cirik, Şükran; Akçalı, Barış; Javel, F.; Migliaccio, Marianna; Thibaut, Thierry; Yüksek, Ahsen; Procaccini, Gabriele

doi:10.1016/j.aquabot.2008.04.013

Cited by 22 publications

(14 citation statements)

References 30 publications

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“…Out of 484 collected ramets, only 134 (28%) represented different genotypes. This low value is comparable to a fully isolated Posidonia population of the Marmara Sea with 30% (Meinesz et al, 2009). Although detection of fine-scaled population structures largely depends on the applied sampling strategy (Procaccini et al, 2007), we regard that a sampling of 30 individuals along 30 m transects with 1 m distance intervals, covering nearly the entire population in most small isolated sites, should allow the detection of important fine-scaled patterns.…”

Section: Local Spatial Structurementioning

confidence: 87%

“…At least, R. maritima did not follow a pattern of decreasing diversity along a northward gradient because of the higher values obtained from Baltic Sea populations, even close to the current northernmost edge of the species' range (Uusikaupunki, Finland). It otherwise is very common to observe less diversity at edges of a species' distribution range, e.g., in P. oceanica (Ruggiero et al, 2002;Meinesz et al, 2009), Zostera noltii Horn. (Coyer et al, 2004), Cymodocea nodosa (Ucria) Aschers.…”

Section: Bottlenecked and Inbred Populationsmentioning

confidence: 97%

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Strong bottlenecks, inbreeding and multiple hybridization of threatened European Ruppia maritima populations

Triest¹,

Sierens

2015

Aquatic Botany

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Section: Local Spatial Structurementioning

confidence: 87%

Section: Bottlenecked and Inbred Populationsmentioning

confidence: 97%

Strong bottlenecks, inbreeding and multiple hybridization of threatened European Ruppia maritima populations

Triest¹,

Sierens

2015

Aquatic Botany

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“…; Meinesz et al . ; Tomasello et al . ), we did not find any evidence for a range‐edge scenario in our meta‐analysis.…”

Section: Discussionmentioning

confidence: 99%

“…) may well be attributable to the effects of disturbance and isolation (rather than history; Meinesz et al . ; Tomasello et al . ).…”

Section: Discussionmentioning

confidence: 99%

A meta‐analysis reveals a positive correlation between genetic diversity metrics and environmental status in the long‐lived seagrassPosidonia oceanica

2015

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The seagrass Posidonia oceanica is a key engineering species structuring coastal marine systems throughout much of the Mediterranean basin. Its decline is of concern, leading to the search for short- and long-term indicators of seagrass health. Using ArcGIS maps from a recent, high-resolution (1-4 km) modelling study of 18 disturbance factors affecting coastal marine systems across the Mediterranean (Micheli et al. 2013, http://globalmarine.nceas.ucsb.edu/mediterranean/), we tested for correlations with genetic diversity metrics (allelic diversity, genotypic/clonal diversity and heterozygosity) in a meta-analysis of 56 meadows. Contrary to initial predictions, weak but significantly positive correlations were found for commercial shipping, organic pollution (pesticides) and cumulative impact. This counterintuitive finding suggests greater resistance and resilience of individuals with higher genetic and genotypic diversity under disturbance (at least for a time) and/or increased sexual reproduction under an intermediate disturbance model. We interpret the absence of low and medium levels of genetic variation at impacted locations as probable local extinctions of individuals that already exceeded their resistance capacity. Alternatively, high diversity at high-impact sites is likely a temporal artefact, reflecting the mismatch with pre-environmental impact conditions, especially because flowering and sexual recruitment are seldom observed. While genetic diversity metrics are a valuable tool for restoration and mitigation, caution must be exercised in the interpretation of correlative patterns as found in this study, because the exceptional longevity of individuals creates a temporal mismatch that may falsely suggest good meadow health status, while gradual deterioration of allelic diversity might go unnoticed.

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“…In the Mediterranean, Posidonia oceanica (L.) Delile is the most important seagrass for its ecological role (Boudouresque et al 1984;UNEP 2007), and it is considered a species at risk, its regression being due to its low genetic variability and many other causes (Meinesz et al 1993(Meinesz et al , 2009DiazAlmela et al 2007;Spatafora et al 2008 subsequently, it has been included in the "Red List" of endangered marine species (UNEP 1990). Reduction of meadow extension leads to reduction in polymorphism and, consequently, its plasticity and resistance to environmental changes, particularly in the most anthropically impacted areas .…”

Section: Introductionmentioning

confidence: 98%

Genetic input byPosidonia oceanica(L.) Delile fruits dispersed by currents in the Ligurian Sea

Micheli

Spinosa

Aliani

et al. 2010

Plant Biosystems - An International Journal Dealing with all As

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An external genetic input of Posidonia oceanica fruits dispersed by currents in the Ligurian Sea (Western Mediterranean) was investigated. During 2003-2004, when a massive fruiting event occurred, fruits were collected from plants at Monterosso al Mare (meadow) and compared with stranded fruits sampled in front of the meadow and downcurrent in Tuscany along 80 km of the coast. After their growth in culture, the plants were analysed using 10 random amplified polymorphic DNA (RAPD) molecular markers. Cluster analysis of similarity showed four distinct genetic populations. One group included parental plants from Monterosso and stranded fruits with the same genetic traits. The second group was formed by fruits stranded in the southern sector (Tuscany), and the third and the fourth groups were samples taken onshore, in front of the meadow, which appeared very different from the other two groups. Results evidenced the probability of the arrival of a new genetic population of nearly 40%, and it seems likely that the stranded fruits of external provenance did not come from the nearest P. oceanica meadows of Tuscany but were probably carried ashore by the Corsica current, as supported by an oceanographic analysis.

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Posidonia oceanica in the Marmara Sea

Cited by 22 publications

References 30 publications

Strong bottlenecks, inbreeding and multiple hybridization of threatened European Ruppia maritima populations

Strong bottlenecks, inbreeding and multiple hybridization of threatened European Ruppia maritima populations

A meta‐analysis reveals a positive correlation between genetic diversity metrics and environmental status in the long‐lived seagrassPosidonia oceanica

Genetic input byPosidonia oceanica(L.) Delile fruits dispersed by currents in the Ligurian Sea

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