Modelling population density of Pinna nobilis (Bivalvia) on the eastern and southeastern coast of Tunisia

Rabaoui, Lotfi; Tlig‐Zouari, Sabiha; Katsanevakis, Stelios; Hassine, Oum Kalthoum Ben

doi:10.1093/mollus/eyq023

Cited by 39 publications

(41 citation statements)

References 26 publications

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“…It is important to remark, that although methods Hendriks et al, 2012), we have conducted simple strip transects because of cost/benefit considerations and because the related bias was small (as the prior intercallibration transects showed). The recorded P. nobilis densities found are among the highest in the Mediterranean Sea (see Table 3 for densities overview in Rabaoui et al, 2010). The mean density among all transects is 3.81 ind/100 m 2 , which agrees with previous studies; being the maximum values found in P. oceanica seagrass meadows (5.21 ind/100 m 2 ).…”

Section: Observed Field Densitiessupporting

confidence: 89%

“…This prediction concurs with the widely known relationship and habitat fidelity of P. nobilis for P. oceanica seagrass meadows Rabaoui et al, 2010) and other vegetated habitats (Katsanevakis and Thessalou-Legaki, 2009). Accordingly, the high densities were also predicted in areas with low values of habitat diversity index, which correspond to a strong homogeneity of P. oceanica seagrass meadows.…”

Section: Effect Of Predictor Variables In Relation To Previous Worksupporting

confidence: 88%

“…In Lake Vouliagmeni, most individuals were predicted to be in the strip between the 10 and 15 m contours, with no individuals deeper than 22 m (possibly due to the high silt content of the deeper areas; Katsanevakis, 2007a). In Tunisia, Rabaoui et al (2010) predicted a density of practically zero at 0.3 m depth, but an increasing density with depth. However, this study was conducted only at a depth of 0 to 6 metres.…”

Section: Effect Of Predictor Variables In Relation To Previous Workmentioning

confidence: 99%

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Spatial distribution modelling of the endangered bivalve Pinna nobilis in a Marine Protected Area

et al. 2014

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The spatial distribution of Pinna nobilis densities have been analysed through a geostatistical approach in the MPA of Cabrera National Park, Balearic Islands (Spain), Western Mediterranean Sea. Regression kriging was used to model the effect of environmental variables on the density of living individuals of P. nobilis and generate a predictive map of its distribution within the MPA. The environmental variables considered for the model were: depth; slope; habitat type and heterogeneity; wave exposure; and MPA zoning. A total of 378 transects were randomly distributed with a total of 149,000 m 2 surveyed at a depth range from 4.2 to 46 m. The recorded P. nobilis densities are among the highest in the Mediterranean Sea. With respect to the prediction model, results indicate that benthic habitats play a key role in the spatial distribution of P. nobilis, with higher densities in seagrass meadows of Posidonia oceanica. The fan mussel population density peaked at 9 m depth, decreasing with depth. Also, decreasing densities are expected with increasing exposure to waves. The predicted map shows some hotspots of density different in size and distributed along the MPA, and provides valuable information for the spatial conservation management of this species.

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Section: Observed Field Densitiessupporting

confidence: 89%

Section: Effect Of Predictor Variables In Relation To Previous Worksupporting

confidence: 88%

Section: Effect Of Predictor Variables In Relation To Previous Workmentioning

confidence: 99%

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Spatial distribution modelling of the endangered bivalve Pinna nobilis in a Marine Protected Area

et al. 2014

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“…The fan mussel Pinna nobilis (Linnaeus 1758) (Mollusca: Bivalvia) is an endemic Mediterranean species with great conservation interest due to regression of its populations as a consequence of overexploitation and habitat deterioration (Rabaoui et al, 2011;Sanna et al, 2013). It has been recognized as an endangered species in the Mediterranean Sea according to European Council Directive 92/43/EEC and is under strict protection (Annex IV of the directive); its capture is forbidden (92/43/EEC).…”

Section: Introductionmentioning

confidence: 99%

“…P. nobilis presents veliger-stage larvae, which drift in the water column for 5-10 days before settling in the sediment, showing highly variable recruitment rates (Hendriks et al, 2012). Despite its endangered conservation status, few studies have addressed population genetics and connectivity patterns in P. nobilis (Katsares et al, 2008;Rabaoui et al, 2011;Sanna et al, 2013;. These studies have used 2 mitochondrial (COI and 16S genes) and 2 nuclear (18S and 28S) markers, which were limited in their resolution to assess the current genetic structure of P. nobilis populations.…”

Section: Introductionmentioning

confidence: 99%

Highly polymorphic microsatellite markers for the Mediterranean endemic fan mussel Pinna nobilis

et al. 2014

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Pinna nobilis is an endemic bivalve of the Mediterranean Sea whose populations have decreased in the last decades due to human pressure; as consequence, it was declared a protected species in 1992. Despite its conservation status, few genetic studies using mitochondrial markers have been published. We report on the isolation and development of 10 microsatellite loci for the fan mussel, Pinna nobilis. All loci (2 di-nucleotide, 5 tri-nucleotide, 2 tetra-nucleotide and 1 penta-nucleotide) are characterized by high polymorphism levels in 76 individuals tested from two populations in Balearic Islands (Spain, Western Mediterranean Sea). Number of alleles ranged from 4 to 24 and expected heterozygosity ranged from 0.4269 to 0.9400. These microsatellites could be very useful to assess the genetic diversity and connectivity patterns of P. nobilis and to establish new conservation strategies.

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Gene pool and connectivity patterns of Pinna nobilis in the Balearic Islands (Spain, Western Mediterranean Sea): Implications for its conservation through restocking

González‐Wangüemert

Basso

Balau

et al. 2018

Aquatic Conservation

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1. Pinna nobilis is an endemic bivalve of the Mediterranean Sea, and a vulnerable species registered as endangered and protected under the European Council Directive 92/43/EEC and Barcelona Convention. 2. In early autumn 2016, a mass mortality event impacted P. nobilis populations in the south-western Mediterranean Sea, including the Balearic Islands. At the time of this study, P. nobilis still maintained high population densities along the Balearic coasts (Western Mediterranean).3. This study evaluated the connectivity of P. nobilis post-larvae and adults in seagrass habitats around the Balearic Islands and identified its source and sink populations.These objectives were reached through a multidisciplinary approach including population genetics (10 microsatellites) and hydrodynamic modelling. 4. High genetic diversity was found and significant genetic differentiation (inferred by fixation index F ST ) was detected between post-larvae samples, but not between adult populations. Significant genic and genotypic differentiation was recorded for adults and post-larvae.5. This pattern was confirmed by correspondence analysis using allele frequencies.The genetic connectivity pattern was consistent with marine currents and dispersal models.6. This work not only improves knowledge of the P. nobilis gene pool in south-west Mediterranean populations and their connectivity patterns, but is also crucial to help evaluate the possibility of recovery from source populations and the possibility of restocking programmes, as well as provide a solid base to establish effective marine reserve networks.

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Modelling population density of Pinna nobilis (Bivalvia) on the eastern and southeastern coast of Tunisia

Cited by 39 publications

References 26 publications

Spatial distribution modelling of the endangered bivalve Pinna nobilis in a Marine Protected Area

Spatial distribution modelling of the endangered bivalve Pinna nobilis in a Marine Protected Area

Highly polymorphic microsatellite markers for the Mediterranean endemic fan mussel Pinna nobilis

Gene pool and connectivity patterns of Pinna nobilis in the Balearic Islands (Spain, Western Mediterranean Sea): Implications for its conservation through restocking

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