Comparison of community structure and diversity of free-living marine nematodes in the sandy intertidal zone of Dalian in winter

Song Huili; Mu Fanghong; Sun Yan; Hua Er

doi:10.12284/hyxb2021060

Volume 43 Issue 8

Aug. 2021

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Song Huili，Mu Fanghong，Sun Yan, et al. Comparison of community structure and diversity of free-living marine nematodes in the sandy intertidal zone of Dalian in winter[J]. Haiyang Xuebao，2021, 43(8)：139–151 doi: 10.12284/hyxb2021060

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Song Huili，Mu Fanghong，Sun Yan, et al. Comparison of community structure and diversity of free-living marine nematodes in the sandy intertidal zone of Dalian in winter [J]. Haiyang Xuebao，2021, 43(8)：139–151 doi: 10.12284/hyxb2021060

Citation:

Song Huili，Mu Fanghong，Sun Yan, et al. Comparison of community structure and diversity of free-living marine nematodes in the sandy intertidal zone of Dalian in winter [J]. Haiyang Xuebao，2021, 43(8)：139–151 doi: 10.12284/hyxb2021060

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Comparison of community structure and diversity of free-living marine nematodes in the sandy intertidal zone of Dalian in winter

doi: 10.12284/hyxb2021060

Song Huili^1
,,
Mu Fanghong¹,
Sun Yan¹,
Hua Er^{1
,
,}

College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China

Received Date: 2020-11-18
Rev Recd Date: 2020-12-23

Available Online: 2021-08-12

Publish Date: 2021-08-25

Abstract

Abstract

In this study, marine nematode samples were collected from Dalian Xiajiahezi Beach near the Bohai Sea and Dalian Golden Beach near the Yellow Sea in December 2015, and the community structure and diversity characteristics of marine nematodes in two sandy intertidal zones were studied. The results showed that there were significant differences in the abundance, dominant species, trophic structure and diversity of marine nematodes at the two beaches. The average abundance of marine nematodes were (592.0±318.9) ind./(10 cm²) in the Xiajiahezi Beach, and (54.6±53.8) ind./(10 cm² ) in the Golden Beach, which was significantly lower than that in the Xiajiahezi Beach. A total of 43 species of marine nematodes were identified, and 13 common species. The dominant species of marine nematodes in the Xiajiahezi Beach were Daptonema sp.1, Daptonema sp.2, Theristus sp.1, Setosabatieria sp.1, Prochromadorella sp.1, Daptonema sp.3, Paracyatholaimus sp.1, Sabatieria breviseta, which were mainly non-selective sedimenous nematodes. The dominant species in the Golden Beach were Oncholaimus sp.1 Chromadorita sp.1, Theristus sp.2, Neochromadora sp.1, Enoplus sp.1, Prochromadorella sp.1, which were mainly omnivorous or predatory nematodes. There were significant differences in species number (S), Margalef’s species richness (d) and Shannon–Wiener index(H′) between the two sandy beaches, and the values were significantly higher in the Xijiahezi Beach than the Golden Beach. The Analysis of Similarity tests (ANOSIM) results showed that there were significant differences in marine nematodes community structure between the two beaches. Interstitial water temperature and median diameter (MD_Φ) were the main environmental factors that cause differences in marine nematode community structure and diversity. The characteristics of the marine nematodes community in the Xijiahezi Beach were also different among different tidal zones due to the variations of sediment granularity and pH. The diversity of marine nematodes in low tidal zone was higher than that in high and mid tidal zones, and the abundance of omnivores and predators was higher, which reflected the complex structure of the marine nematodes community. In the Golden Beach, there was no significant difference in environmental factors in different tidal zones, and the difference in nematodes community structure and diversity of tidal areas was not significant and relatively uniform. In addition, hydrodynamic force function was also an important factor that causes differences in marine nematode community structures at the studied beaches. On the one hand, hydrodynamic force affected the community characteristics of marine nematodes by influencing the deposition of sediments with different particle sizes. On the other hand, hydrodynamic force could affect the dispersity of nematodes which in turn affects their tidal distribution.
- Dalian; beach,
- marine nematodes,
- community structure,
- feeding type

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References(52)

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