Genetic analyses reveal fine-scale genetic structure between lagoon and open water spoon seagrass (Halophila ovalis) populations around Dongsha Island

Liu, Shang-Yin Vanson; Hsu, Chi-Hsuan

doi:10.1016/j.aquabot.2021.103421

Cited by 5 publications

(4 citation statements)

References 35 publications

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“…TA B L E 3 List of known annotated functions for the 14 true outliers from the UniProt database (Details about BLASTn and BLASTx results can be found in Table S6). Sea (Meinesz et al, 2009) and the Stagnone di Marsala (Tomasello et al, 2009); Halophila beccarii populations in Cau Hai lagoon, Vietnam (Phan et al, 2017) or recently Halophila ovalis populations in Dongsha Island, Taiwan (Liu & Hsu, 2021)]. Additionally, we observed a reduction in the number of distinct genotypes detected (especially for the northern basin) when compared with Tomasello et al (2009).…”

Section: Discussionmentioning

confidence: 65%

“…This is in line with several previous studies showing that seagrass populations from confined environments (such as coastal lagoons) tend to exhibit some levels of genetic isolation [e.g. Zostera marina populations in San Quintin Bay, Mexico (Muñiz‐Salazar et al, 2006); P. oceanica in the Marmara Sea (Meinesz et al, 2009) and the Stagnone di Marsala (Tomasello et al, 2009); Halophila beccarii populations in Cau Hai lagoon, Vietnam (Phan et al, 2017) or recently Halophila ovalis populations in Dongsha Island, Taiwan (Liu & Hsu, 2021)]. Additionally, we observed a reduction in the number of distinct genotypes detected (especially for the northern basin) when compared with Tomasello et al (2009).…”

Section: Discussionmentioning

confidence: 99%

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Signs of local adaptation by genetic selection and isolation promoted by extreme temperature and salinity in the Mediterranean seagrass Posidonia oceanica

et al. 2023

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Adaptation to local conditions is known to occur in seagrasses; however, knowledge of the genetic basis underlying this phenomenon remains scarce. Here, we analysed Posidonia oceanica from six sites within and around the Stagnone di Marsala, a semi‐enclosed coastal lagoon where salinity and temperature exceed the generally described tolerance thresholds of the species. Sea surface temperatures (SSTs) were measured and plant samples were collected for the assessment of morphology, flowering rate and for screening genome‐wide polymorphisms using double digest restriction‐site‐associated DNA sequencing. Results demonstrated more extreme SSTs and salinity levels inside the lagoon than the outer lagoon regions. Morphological results showed significantly fewer and shorter leaves and reduced rhizome growth of P. oceanica from the inner lagoon and past flowering events were recorded only for a meadow farthest away from the lagoon. Using an array of 51,329 single nucleotide polymorphisms, we revealed a clear genetic structure among the study sites and confirmed the genetic isolation and high clonality of the innermost site. In all, 14 outlier loci were identified and annotated with several proteins including those relate to plant stress response, protein transport and regulators of plant‐specific developmental events. Especially, five outlier loci showed maximum allele frequency at the innermost site, likely reflecting adaptation to the extreme temperature and salinity regimes, possibly due to the selection of more resistant genotypes and the progressive restriction of gene flow. Overall, this study helps us to disentangle the genetic basis of seagrass adaptation to local environmental conditions and may support future works on assisted evolution in seagrasses.

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Section: Discussionmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Signs of local adaptation by genetic selection and isolation promoted by extreme temperature and salinity in the Mediterranean seagrass Posidonia oceanica

et al. 2023

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“…For the members of the genus Halophila, H. ovalis is widely distributed in the Indo-Pacific region (Liu and Hsu, 2021). By using five loci of microsatellite markers, Nguyen et al (2014) indicated that the genetic distances between southern Viet Nam and Gulf of Thailand were lower than other regions (Malaysia, Hong Kong, Andaman Sea).…”

Section: Genetic Diversity and Population Structures Of Selected Spec...mentioning

confidence: 99%

“…For the members of the genus Halophila , H. ovalis is widely distributed in the Indo-Pacific region ( Liu and Hsu, 2021 ). By using five loci of microsatellite markers, Nguyen et al.…”

Section: Genetic Diversity and Population Structures Of Selected Spec...mentioning

confidence: 99%

Current advances in seagrass research: A review from Viet Nam

Nguyen¹,

Phan

Cao

et al. 2022

Front. Plant Sci.

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Seagrass meadows provide valuable ecosystem services but are fragile and threatened ecosystems all over the world. This review highlights the current advances in seagrass research from Viet Nam. One goal is to support decision makers in developing science-based conservation strategies. In recent years, several techniques were applied to estimate the size of seagrass meadows. Independent from the method used, there is an alarming decline in the seagrass area in almost all parts of Viet Nam. Since 1990, a decline of 46.5% or 13,549 ha was found. Only in a few protected and difficult-to-reach areas was an increase observed. Conditions at those sites could be investigated in more detail to make suggestions for conservation and recovery of seagrass meadows. Due to their lifestyle and morphology, seagrasses take up compounds from their environment easily. Phytoremediation processes of Thalassia hemprichii and Enhalus acoroides are described exemplarily. High accumulation of heavy metals dependent on their concentration in the environment in different organs can be observed. On the one hand, seagrasses play a role in phytoremediation processes in polluted areas; on the other hand, they might suffer at high concentrations, and pollution will contribute to their overall decline. Compared with the neighboring countries, the total Corg stock from seagrass beds in Viet Nam was much lower than in the Philippines and Indonesia but higher than that of Malaysia and Myanmar. Due to an exceptionally long latitudinal coastline of 3,260 km covering cool to warm water environments, the seagrass species composition in Viet Nam shows a high diversity and a high plasticity within species boundaries. This leads to challenges in taxonomic issues, especially with the Halophila genus, which can be better deduced from genetic diversity/population structures of members of Hydrocharitaceae. Finally, the current seagrass conservation and management efforts in Viet Nam are presented and discussed. Only decisions based on the interdisciplinary cooperation of scientists from all disciplines mentioned will finally lead to conserve this valuable ecosystem for mankind and biodiversity.

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Temporal instability in genetic structure of a marine monocot (Halophila ovalis)

Liu¹,

Hsu²,

Li³

2022

Estuarine, Coastal and Shelf Science

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Genetic analyses reveal fine-scale genetic structure between lagoon and open water spoon seagrass (Halophila ovalis) populations around Dongsha Island

Cited by 5 publications

References 35 publications

Signs of local adaptation by genetic selection and isolation promoted by extreme temperature and salinity in the Mediterranean seagrass Posidonia oceanica

Signs of local adaptation by genetic selection and isolation promoted by extreme temperature and salinity in the Mediterranean seagrass Posidonia oceanica

Current advances in seagrass research: A review from Viet Nam

Temporal instability in genetic structure of a marine monocot (Halophila ovalis)

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