Population, Aquaculture and Transplantation Applications of Critically Endangered Species Pinna nobilis (Linnaeus 1758) in the Mediterranean Sea

Acarlı, Sefa

doi:10.33714/masteb.627562

Cited by 10 publications

(4 citation statements)

References 91 publications

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“…Transplantations have been suggested to be responsible for the absence of geographic structure of Mytilus galloprovincialis populations in the Aegean Sea ( Giantsis, Kravva & Apostolidis, 2012 ). This might have been the case also for P. nobilis , as transplantations had been proposed as a conservation action for the protection of the species ( Katsanevakis, 2016 ; Acarli, 2021 ), although they were most likely performed only on a local scale and, thus, they should not have influenced the genetic structure of P. nobilis at the scale of the Aegean Sea. However, since they were not documented in detail, it is impossible to fully assess their potential effect on the populations.…”

Section: Discussionmentioning

confidence: 99%

Insights on Pinna nobilis population genetic structure in the Aegean and Ionian Sea

Sarafidou,

Tsaparis,

Issaris

et al. 2023

PeerJ

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The fan mussel Pinna nobilis Linnaeus, 1758 is an endemic species of the Mediterranean Sea, protected by international agreements. It is one of the largest bivalves in the world, playing an important role in the benthic communities; yet it has been recently characterized as Critically Endangered by the IUCN, due to mass mortality events. In this context, the assessment of the genetic variation of the remaining P. nobilis populations and the evaluation of connectivity among them are crucial elements for the conservation of the species. For this purpose, samples were collected from six regions of the Eastern Mediterranean Sea; the Islands of Karpathos, Lesvos and Crete; the Chalkidiki and Attica Peninsulas; and the Amvrakikos Gulf. Sampling was performed either by collecting tissue from the individuals or by using a non-invasive method, i.e., by scraping the inside of their shells aiming to collect their mucus and thus avoid stress induction to them. Conventional molecular techniques with the use of the COI and 16S rRNA mitochondrial markers were selected for the depiction of the intra-population genetic variability. The analyses included 104 samples from the present study and publicly available sequences of individuals across the whole Mediterranean Sea. The results of this work (a) suggest the use of eDNA as an efficient sampling method for protected bivalves and (b) shed light to the genetic structure of P. nobilis population in the Eastern Mediterranean; this latter knowledge might prove to be fundamental for the species conservation and hence the ecosystem resilience. The haplotype analyses reinforced the evidence that there is a certain degree of connectivity among the distinct regions of the Mediterranean; yet there is evidence of population distinction within the basin, namely between the Western and the Eastern basins. The combination of both genetic markers in the same analysis along with the inclusion of a large number of individuals produced more robust results, revealing a group of haplotypes being present only in the Eastern Mediterranean and providing insights for the species’ most suitable conservation management.

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Section: Discussionmentioning

confidence: 99%

Insights on Pinna nobilis population genetic structure in the Aegean and Ionian Sea

Sarafidou,

Tsaparis,

Issaris

et al. 2023

PeerJ

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“…Similarly, Basso et al (2015) documented that there was a decreasing trend in the number of individuals with increasing depth, with higher densities in the first 10-12 m. It has also been observed that P. nobilis densely distributed in seagrass habitats while scarce or no population has been observed in gravelly or sandy habitats. Many researchers have reported the dense distribution of P. nobilis populations within seagrass meadows (Coppa et al, 2010;Basso et al, 2015;Tatton et al, 2019;Acarli, 2021;Acarlı et al, 2021). Basso et al (2015) compared 24 scientific papers based on 77 observations and noted that P. nobilis were most frequently observed in P. oceanica beds with an average of 8.06±2.35 ind./100 m 2 , while in Cymodocea meadows with averages of 11.06±1.82 ind./100 m 2 .…”

Section: Discussionmentioning

confidence: 99%

Distribution of the critically endangered fan mussel Pinna nobilis population in the Çanakkale Strait and Marmara Sea

Acarlı,

Kale

2024

EgeJFAS

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This study was conducted with the primary objective of determining the presence of both healthy and impacted Pinna nobilis populations along the European coasts of the Sea of Marmara, followed by the identification of P. nobilis abundance and survival rates in the region encompassing the Çanakkale Strait and the southern coasts of the Sea of Marmara. Underwater surveys were randomly conducted at 19 distinct stations, including 8 stations along the European coasts of the Sea of Marmara, 7 stations along the southern coasts of the Sea of Marmara, and 6 stations within the Çanakkale Strait. SCUBA diving equipment was utilized to record information on habitat structure, water temperature, depth, and visibility at each station. The transect length during underwater surveys and the number of transects at each station were determined based on the condition of the seabed and the size of the area, respectively. Throughout the study period (September 2021 and October 2023), water temperature fluctuated between 17.5°C and 26.6°C. At the end of the study, a total of 395 individuals (147 live, 248 dead) were observed, with live individuals exhibiting total lengths ranging from 16.4 cm to 50.9 cm. This study represents the first investigation into the spatial distribution of P. nobilis along the European coast of the Marmara Sea. The study contributes significantly to enhancing our understanding of the ecology of P. nobilis populations in both the Sea of Marmara and the Çanakkale Strait. Additionally, recommendations for the rehabilitation of impacted populations and the conservation of healthy populations have been provided for decision-makers and fisheries managers.

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“…The culture of fan mussels in captivity has complications related to the small number of individuals to work with, their large size, which reduces the number of individuals that can be maintained in tanks, and the impossibility of growing collected seed in suspended culture in the open sea, as had been done priors to the mortality event (Kozul et al, 2012; Acarli, 2021). These circumstances make it necessary to find alternative solutions to obtain gametes and work on larval settlement as a key objective to close the life cycle in captivity.…”

Section: Discussionmentioning

confidence: 99%

Reproduction of the endangered fan mussel Pinna nobilis under natural and captivity conditions

Hernandis,

Prado,

García‐March

et al. 2023

Aquatic Conservation

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A mass mortality event that started in 2016 has put the fan mussel Pinna nobilis close to the brink of extinction, leading to the species being classified as Critically Endangered in the Red List of the International Union for Conservation of Nature. Under current circumstances, with the persistence of the disease caused by Haplosporidium pinnae in the open sea, isolated populations in coastal lagoons and estuarine bays appear to be the main chance for the survival of the species. The low resilience of those populations highlights the importance of implementing additional measures to avoid the extinction of the fan mussel. One of these measures relies on completing its reproductive cycle in captivity. The reproductive window of the remaining fan mussel population in Alfacs Bay was explored to obtain gametes and to understand possible limitations in the reproductive activity in wild populations. For this purpose, during the reproductive season, several groups of individuals were relocated for short periods (~2 weeks) into the vivarium to obtain gametes under controlled conditions. Simultaneously, controlled temperature treatments and adapted food dosage for conditioning adult fan mussels out of their reproductive season in the wild were conducted in a recirculating aquaculture system. The reproduction of natural populations was mostly restricted to May, featuring temperatures around 20°C. A low success of spawning was obtained in the vivarium, with a 0% success in 11 out of 20 of the trials (six to nine individuals each) and an overall success of 16% (25 out of 156 individuals). A 100% success (14 out of 14) was obtained with individuals conditioned for ~2 months in the recirculating aquaculture system. A second conditioning of six of those individuals was attempted after a ~3‐month period, with a 33.3% success of spawning.

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Population, Aquaculture and Transplantation Applications of Critically Endangered Species Pinna nobilis (Linnaeus 1758) in the Mediterranean Sea

Cited by 10 publications

References 91 publications

Insights on Pinna nobilis population genetic structure in the Aegean and Ionian Sea

Insights on Pinna nobilis population genetic structure in the Aegean and Ionian Sea

Distribution of the critically endangered fan mussel Pinna nobilis population in the Çanakkale Strait and Marmara Sea

Reproduction of the endangered fan mussel Pinna nobilis under natural and captivity conditions

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