Vertical Variations of Core Sound Velocity: Evidence of Paleooceanographic History Since the Pleistocene Epoch

Lü, Bo; Huang, Shaobo; Li, Ganxian; Zhang, Fusheng

doi:10.1080/716100485

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…Similar to other terrestrial species, E. cardinalis may have moved and survived in a potential glacial refuge during this period, such as the semiclosed South China Sea (Hewitt, 1999). In the late Pleistocene, the sea level was still 30 m lower than the present level, but the glaciation began to disappear and the sea water gradually poured into Beibu Gulf through the Qiongzhou Strait (Lu et al, 2003). An initial population of E. cardinalis may have immigrated to Beibu Gulf from neighboring areas after it was filled with sea water and sufficiently deep.…”

Section: Discussionmentioning

confidence: 91%

Threadfin Porgy (Evynnis Cardinalis) Haplotype Pattern and Genetic Structure in Beibu Gulf, South China Sea

Wang

et al. 2021

Front. Environ. Sci.

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Threadfin porgy (Evynnis cardinalis) is one of the important commercial fishing targets of bottom trawl fishery in the northern South China Sea. It is mainly threatened by overexploitation and listed as endangered species in the IUCN Red List. To investigate the demographic history and genetic structure of E. cardinalis population, partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene were obtained from 162 individuals collected from Beibu Gulf, South China Sea. In total, 44 different haplotypes were identified, and the dominant haplotype was found in all sampling sites. Across the dataset, nucleotide diversity was low, whereas haplotype diversity was high. Low pairwise comparisons of ΦST and high gene flow among sampling sites revealed a genetically homogeneous population structure in Beibu Gulf, indicating a single panmictic stock of E. cardinalis in this area. The star-like haplotype network, unimodal mismatch distribution, and significantly negative Tajima’s D and Fu’s Fs values indicated recent population demographic expansion of E. cardinalis. The mismatch distribution and Bayesian skyline plot results indicated that E. cardinalis from Beibu Gulf might have experienced colonization and demographic expansion due to sea level fluctuations during the late Pleistocene.

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Section: Discussionmentioning

confidence: 91%

Threadfin Porgy (Evynnis Cardinalis) Haplotype Pattern and Genetic Structure in Beibu Gulf, South China Sea

Wang

et al. 2021

Front. Environ. Sci.

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show abstract

“…Similar to other terrestrial species, E. cardinalis may have moved and survived in a potential glacial refuge during this period, such as the semi-closed South China Sea (Hewitt, 1999). In the late Pleistocene, the sea level was still 30 m below the present level, but the glaciation began to disappear and the sea water gradually poured into Beibu Gulf via the Qiongzhou Strait (Lu, Huang, Li, & Zhang, 2003). An initial population of E. cardinalis may have immigrated to Beibu Gulf from neighboring areas after it was filled with sea water and sufficiently deep.…”

Section: Discussionmentioning

confidence: 93%

Threadfin porgy (Evynnis cardinalis) haplotype pattern and genetic structure in Beibu Gulf, South China Sea

Xu,

Wang,

Wang

et al. 2024

Preprint

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Threadfin porgy (Evynnis cardinalis) is an important commercial fishing target of bottom trawl fisheries in the northern South China Sea. It is mainly threatened by overexploitation and listed as endangered in the IUCN Red List. To investigate E. cardinalis population demographic history and genetic structure, fragments of the mitochondrial cytochrome c oxidase subunit I gene were sequenced for 162 individuals collected from Beibu Gulf, South China Sea. In total, 44 different haplotypes were identified, and the dominant widespread haplotype was found in all 11 sampling sites. Across the dataset, nucleotide diversity was low but haplotype diversity was high. Low pairwise comparisons of ΦST and high gene flow between all sampling sites revealed a genetically homogeneous population structure in Beibu Gulf, which indicated a single panmictic stock of E. cardinalis in this area. The star-like haplotype network, unimodal mismatch distribution, and significantly negative Tajima’s D and Fu’s Fs values indicated recent population demographic expansion of E. cardinalis. The mismatch distribution and Bayesian skyline plot results indicated that E. cardinalis from Beibu Gulf experienced colonization and demographic expansion during the late Pleistocene due to sea level fluctuations.

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“…Because the test samples for these three trends were all silt, with little differences in porosity, density or water content, it is difficult to clearly interpret these results in terms of the actual effect of such trends in sediment sound velocities with temperature. In this study, it was speculated that seafloor sediments have complex structures due to their different sedimentary histories (Hamilton, 1976;Lu et al, 2003), and the testes samples were all unconsolidated sediments with a loose structure. The difference between loose and unconsolidated structures composed of pore particles of different shapes and geometries leads to the complexity of the relative motions of seawater through pores and the solid-phase particles under thermal motion, possibly resulting in the formation of the three trends observed by Zou et al (2008).…”

Section: Influence Of Temperature On the Deviation Of Sound Velocitymentioning

confidence: 95%

On-deck vs. laboratory analyses of the sound velocity of sediments from the Huanghai and Bohai seas

Liu,

Zheng,

Wang

et al. 2024

Front. Mar. Sci.

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One popular method of obtaining the acoustic parameters of seabed sediments is by measuring the sound velocity of sediment samples in a laboratory. However, the effects of environmental variation and physical perturbation on acoustic properties are typically neglected in the application of such measured acoustic parameters. In this study, sediment samples were collected from the Huanghai and Bohai seas to measure sound velocity both on the deck and in the laboratory using a digital sonic measuring system. Additionally, sediment compositions, physical and mechanical properties and microstructures were determined. Sound velocity comparisons between on-deck and laboratory measurements indicate that laboratory-measured velocities are generally higher than those measured on the deck, with differences ranging from 1.45 m/s to 130.05 m/s, due to the water loss and densification of sedimentary particles in laboratory settings. The discrepancy of sound velocities measured in the laboratory and on the deck also differ based on the types of sediments sampled. Overall, the discrepancy increases with measurement frequency, increasing average grain diameter and sand content, as well as with decreasing clay content.

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Vertical Variations of Core Sound Velocity: Evidence of Paleooceanographic History Since the Pleistocene Epoch

Cited by 9 publications

References 2 publications

Threadfin Porgy (Evynnis Cardinalis) Haplotype Pattern and Genetic Structure in Beibu Gulf, South China Sea

Threadfin Porgy (Evynnis Cardinalis) Haplotype Pattern and Genetic Structure in Beibu Gulf, South China Sea

Threadfin porgy (Evynnis cardinalis) haplotype pattern and genetic structure in Beibu Gulf, South China Sea

On-deck vs. laboratory analyses of the sound velocity of sediments from the Huanghai and Bohai seas

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