Search

Your search keyword '"Xu, Qinzeng"' showing total 158 results
Start Over Author "Xu, Qinzeng"
158 results on '"Xu, Qinzeng"'

14. Population genetics and evolutionary history of the intertidal brittle star Ophiothrix (Ophiothrix) exigua in the northern China Sea.

Author

Zhang, Qian, Hu, Xuying, Deng, Zongjing, Li, Yixuan, Dong, Yue, Han, Chen, Zeng, Xiaoqi, Xiao, Ning, Zhang, Xuelei, and Xu, Qinzeng

Subjects
POPULATION differentiation, PLEISTOCENE Epoch, GENETIC variation, GENE flow, HAPLOTYPES
Abstract

Ophiothrix (Ophiothrix) exigua is a common brittle star in the northwestern Pacific. As a dominant species, O. exigua inhabiting the intertidal rocky ecosystem are affected by multiple environmental stressors, but molecular insights into their genetic population structure remain poorly studied. In this study, we investigated the population genetics and evolutionary history of six O. exigua populations from the northern China Sea using mitochondrial (COI, NAD4) and nuclear (ITS2, 18S) gene markers. High haplotype diversity, low nucleotide diversity, and low rates of gene differentiation among the populations of O. exigua were detected. Pairwise genetic differentiation (ΦST) statistics between different localities were negative or low and insignificant, suggesting strong gene flow of this species over the study areas. The phylogenetic analyses showed that the populations exhibited high homogeneity between localities in our study area. Demographic analyses indicated that the populations experienced sustained expansion around 0.2 million years ago. This expansion was likely related to transgressions events in the Yellow Sea during the Pleistocene period. Additional samples of O. exigua from disparate geographical locations, especially the Japan Sea and the Korean Peninsula, will be needed to unravel the population genetic patterns and evolutionary history of this species. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

15. The complete mitochondrial genome of Mya japonica (Jay, 1857 Myida:myidae).

Author

Dai, Mengdi, Mo, Jing, Liao, Xiaomei, Li, Zhong, Wu, Han, Xia, Sudong, and Xu, Qinzeng

Subjects
MITOCHONDRIAL DNA, MYA arenaria, FISHERY resources, RIBOSOMAL RNA, PHYLOGENY
Abstract

The soft-shell clam Mya japonica (Jay, 1857) is a commercially important fishery resource. In this study, we identified the complete mitochondrial genome of M. japonica and performed a phylogenetic analysis to explore its genetic relationship with Mya arenaria. The genome is 21,396 bp in length and contains 13 protein-coding genes (PCGs), 23 transfer RNA genes (tRNAs), 2 ribosomal RNA genes (rRNAs), and 5 D-Loop control regions. The atp8 gene was annotated in Myidae for the first time. Notably, the genome contains an additional trnM, consistent with M. arenaria. The length of the cox2 gene is 1,947 bp, which is 513 bp longer than that in M. arenaria. Its base composition is 29.14% A, 37.26% T, 10.89% C, and 22.71% G. Phylogenetic analysis based on 12 PCGs and 2 rRNAs indicates that M. japonica and M. arenaria form a sister group. In this study, the identification and phylogenetic analysis of the complete mitochondrial genome of M. japonica provide significant information for future taxonomic and evolutionary research of the genus Mya. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

20. Symbiotic Relationship of Comasterschlegelii (Crinoidea: Comatulidae) and Gymnolophus obscura (Ophiuroidea: Ophiotrichidae) Derived from Stable Isotope and Fatty Acid Analyses.

Author

Li, Zhong, Dong, Yue, Ge, Meiling, Zhang, Qian, Sun, Yuyao, Dai, Mengdi, Zhang, Xuelei, Li, Xiubao, Wang, Zongling, and Xu, Qinzeng

Subjects
STABLE isotopes, CORAL communities, CORAL reefs & islands, DOMOIC acid, ORGANIC compounds, FATTY acids
Abstract

Coral reef community exhibits high species diversity and a broad range of biological relationships, including widespread symbiosis and complex food utilization patterns. In our study, we investigated the symbiotic relationship between the commonly crinoid host Comaster schlegelii and its ophiuroid obligatory symbiont Gymnolophus obscura. Using a combination of fatty acid biomarkers and stable isotopic compositions, we explored differences in their organic matter utilization strategies and nutritional relationships. The result of stable isotopes revealed that G. obscura had higher δ15N values than its crinoid host. Particulate organic matter and phytoplankton were identified as the primary food sources for both species, however C. schlegelii showed a higher proportional contribution from benthic microalgae. Fatty acid markers showed that C. schlegelii was more dependent on benthic microalgae such as diatoms, and less on debritic organic matter and bacteria than G. obscura. Elevated δ15N values of G. obscura and similar food source contribution rates between the host and symbiont suggest that ophiuroid feeds on materials filtered by crinoids and have similar diet to the host. Our results provide insights into the symbiotic patterns of crinoids and ophiuroids, while also supplying foundational data on how symbiotic reef species select organic matter utilization strategies to adapt to their environment. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

29. Ecosystem Management

Author

Dai, Limin, Shao, Guofan, Ren, Jizhou, Wang, Tao, Chen, Guangting, Lv, Xianguo, Xu, Qinzeng, Yang, Hongsheng, Xu, Qiang, Luo, Shiming, Ma, Lin, Qian, Liu, Ma, Wenqi, Zhang, Fusuo, Huang, Jikun, Jia, Xiangping, Xiang, Cheng, and Li, Wenhua, editor

Published
2015
Full Text
View/download PDF

44. Structure and Connectivity of Hydrothermal Vent Communities Along the Mid-Ocean Ridges in the West Indian Ocean: A Review

Author

Perez, Maeva, Sun, Jin, Xu, Qinzeng, Qian, Peiyuan, Perez, Maeva, Sun, Jin, Xu, Qinzeng, and Qian, Peiyuan

Abstract

To date, 13 biologically active hydrothermal vent (HTV) fields have been described on the West Indian Ocean ridges. Knowledge of benthic communities of these vent ecosystems serves as scientific bases for assessing the resilience of these ecosystems under the global effort to strike an elegant balance between future deep-sea mining and biodiversity conservation. This review aims to summarize our up-to-date knowledge of the benthic community structure and connectivity of these Indian vents and to identify knowledge gaps and key research questions to be prioritized in order to assess the resilience of these communities. The HTVs in the West Indian Ocean are home to many unique invertebrate species such as the remarkable scaly-foot snail. While distinct in composition, the macrofaunal communities of the Indian HTVs share many characteristics with those of other HTVs, including high endemism, strong zonation at the local scale, and a simple food web structure. Furthermore, Indian vent benthic communities are mosaic compositions of Atlantic, Pacific, and Antarctic HTV fauna possibly owning to multiple waves of past colonization. Phylogeographic studies have shed new light into these migratory routes. Current animal connectivity across vent fields appears to be highly influenced by distance and topological barriers. However, contrasting differences in gene flow have been documented across species. Thus, a better understanding of the reproductive biology of the Indian vent animals and the structure of their population at the local scale is crucial for conservation purposes. In addition, increased effort should be given to characterizing the vents’ missing diversity (at both the meio and micro-scale) and elucidating the functional ecology of these vents. © Copyright © 2021 Perez, Sun, Xu and Qian.

Published
2021

45. Phylogeography of the Brittle Star Ophiura sarsii Lütken, 1855 (Echinodermata: Ophiuroidea) from the Barents Sea and East Atlantic

Author

Genelt-Yanovskiy, Evgeny, Li, Yixuan, Stratanenko, Ekaterina, Zhuravleva, Natalia, Strelkova, Natalia, Xu, Qinzeng, and Nazarova, Sophia

Subjects
anatomy_morphology
Abstract

Ophiura sarsii is a common brittle star species across Arctic and subarctic regions of Atlantic and Pacific oceans. In the Barents Sea O. sarsii is among the dominant echinoderms. We studied genetic diversity of O. sarsii by sequencing the 548 bp fragment of mitochondrial COI gene. O.sarsii demonstrated high genetic diversity in the Barents Sea. Both major Atlantic mtDNA lineages were present in the Barents Sea and were evenly distributed between the northern waters around Svalbard archipelago and the southern part near Murmansk coast of Kola Peninsula. Both regions, as well as other parts of the O.sarsii range, were characterized by high haplotype diversity with a significant number of private haplotypes, being mostly satellites to the two dominant haplotypes, each belonging to a different mtDNA clade. Demographic analyses indicated that the demographic and spatial expansion of Ophiura sarsii in the Barents Sea most plausibly has started during the Bølling–Allerød interstadial, during the deglaciation of the western margin of the Barents Sea.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results