Admixture of Holothurian Species in the Hellenic Seas (Eastern Mediterranean) as Revealed by RADseq

Gkafas, Georgios A.; Sarantopoulou, Joanne; Apostologamvrou, Chrysoula; Antoniadou, Chryssanthi; Exadactylos, Athanasios; Fleris, Georgios; Vafidis, Dimitris

doi:10.3390/su151511493

Cited by 4 publications

(2 citation statements)

References 64 publications

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“…mammata in the Ru der Bošković Institute collection in Rovinj, is indeed misidentified and is a mammilate morphotype of H. tubulosa, as [16] had predicted (Figure 2). Even though we did not find any research showing hybridisation between H. mammata and H. tubulosa, recent studies indicated that it is possible between H. tubulosa and H. poli [40]. Given that this analysis was carried out based on mtDNA, further analyses that combine nDNA and mtDNA markers are needed to ascertain the presence of hybrids.…”

Section: Discussionmentioning

confidence: 62%

Barcoding (COI) Sea Cucumber Holothuria mammata Distribution Analysis: Adriatic Rare or Common Species?

Sertić Kovačević,

Baričević,

Kružić

et al. 2023

Genes

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The overexploitation of the western Pacific Ocean has expanded the sea cucumber fishery into new regions to supply the Asian market. In 2013, sea cucumbers were removed from the Croatian marine protected species list, and commercial fishery took place for a short period (2017–2018) in the Eastern Adriatic Sea. However, holothuroid species are difficult to distinguish. Holothuria mammata is a species that has rarely been reported in this region and strongly resembles the common species Holothuria tubulosa. This is the first study to assess the genetic diversity of sea cucumbers in the Adriatic Sea using genetic barcoding of the mitochondrial gene cytochrome c oxidase subunit 1 (COI). Specimens for barcoding were collected from the northern and central Adriatic, along with a specimen that had been previously identified as H. sp. cf. mammata based on its morphological characteristics. While genetic analyses showed identified this specimen as H. tubulosa, 30% of the collected specimens were genetically identified as H. mammata. These results call into question the historically accepted sea cucumber assemblage in the Adriatic Sea, which regarded H. mammata as a rare species and generally disregarded its presence in large census studies. Such species distribution data are extremely important in developing and monitoring a sustainable fishery.

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Section: Discussionmentioning

confidence: 62%

Barcoding (COI) Sea Cucumber Holothuria mammata Distribution Analysis: Adriatic Rare or Common Species?

Sertić Kovačević,

Baričević,

Kružić

et al. 2023

Genes

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“…Because of their broadcast spawning behavior many closely related congeneric species of sea cucumbers can hybridize, particularly in areas where both populations are abundant (e.g. Gkafas et al, 2023). In Papua New Guinea the golden sandfish (H. lessoni) occurs in similar habits to H. scabra, although in Manus this species occurs in very low abundances (authors, personal observations).…”

Section: Introductionmentioning

confidence: 99%

Dispersal patterns of sandfish (Holothuria scabra) larvae in Manus Province, Papua New Guinea

Waldie,

Feary,

Bode

et al. 2024

Front. Mar. Sci.

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In many tropical nations, coastal communities seek to manage their sea cucumber fisheries by establishing locally managed marine areas on their traditional fishing grounds. These managed areas can protect spawning stocks, however the extent to which they help to replenish nearby sea cucumber fisheries is debated, as nothing is known about the scales at which sea cucumber larvae disperse. In this study, we used genetic parentage analyses and statistical modelling to provide the first empirical measure of larval dispersal patterns for a sea cucumber species. We analysed tissue samples from 765 adult and 827 juvenile sandfish (Holothuria scabra) collected from five traditional fishing grounds of the Titan tribe, from Manus Province, Papua New Guinea. All adults were sampled from the Pere fishing grounds (the larval source area), with juveniles sampled from the Pere, Mbunai, Tawi, Timonai and Mbuke fishing grounds. Parentage analysis identified 15 juveniles that were the offspring of parents sampled from Pere fishing grounds, with six of these juveniles located in the same fishing grounds as their parents. The best-fit larval dispersal kernel predicted that the average H. scabra larvae travelled 15 km from its spawning location, with 50% of larvae settling within 6.7 km of their parents and 95% of larvae settling within 59 km of their parents. These results suggest that the Titan tribes’ desire to protect their H. scabra spawning stocks by establishing a network of locally managed marine areas across 65 km of continuous coastline is a culturally appropriate strategy, which has merit from both an ecological and fisheries standpoint.

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Casting light on the European anchovy: from biology to conservation and industry

Mutalipassi,

D’Anza,

Pugliano

et al. 2024

Front. Ecol. Evol.

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This manuscript explores the role of European anchovies (Engraulis encrasicolus) in the central Mediterranean Region, shedding light on their ecological significance, conservation challenges, and sustainable utilization. The European anchovy is one of Europe’s most important fish resources in the Mediterranean basin, and it is considered a keystone species, playing a pivotal role in both ecological and socio-economic dimensions. However, in recent decades, European anchovy, together with Sardina pilchardus (commonly known as European sardine), has suffered a population decline for several reasons. Consequently, it is necessary to improve the management of anchovy fisheries by understanding the reproductive modes and characteristics, the influence of currents on the passive transport of eggs and larvae, the feeding habits, the environmental adaptability (e.g., salinity), and the distribution of ecotypes along the Italian coasts. Such information is fundamental for the management of fisheries, especially artisanal ones, and to control frauds, especially in protected, geographically referred, and traditional high-quality commercial products. Various aspects, ranging from their population dynamics to their industrial processing and the ecological implications of these activities were delved, highlighting the knowledge about anchovy populations and ecotypes and its importance in maintaining ecosystem balance and sustaining human communities. The ecological interaction of anchovies within the food web, as essential data in the conservation actions and management of these resources was emphasized. In addition, the metabolic and stomach contents diversity among anchovy populations and ecotypes was discussed, enhancing our understanding of their adaptability to varying environmental conditions. The manuscript then explores the traditional and industrial processing of anchovies, encompassing aspects ranging from fishing techniques (i.e., methods of capture) to their industrial significance, sustainability concerns, issues of fraud, and the establishment of geographical traceability. Finally, the opportunities for sustainable and biotechnological utilization of anchovy discards were also further explored, demonstrating the potential for waste reduction and resource optimization.

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Admixture of Holothurian Species in the Hellenic Seas (Eastern Mediterranean) as Revealed by RADseq

Cited by 4 publications

References 64 publications

Barcoding (COI) Sea Cucumber Holothuria mammata Distribution Analysis: Adriatic Rare or Common Species?

Barcoding (COI) Sea Cucumber Holothuria mammata Distribution Analysis: Adriatic Rare or Common Species?

Dispersal patterns of sandfish (Holothuria scabra) larvae in Manus Province, Papua New Guinea

Casting light on the European anchovy: from biology to conservation and industry

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