| 摘要: |
| 为探究蜈支洲岛珊瑚礁区大型底栖贝类群落特征及其碳储量，环岛均匀布设了13个调查断面，系统开展了底栖贝类资源调查。通过对调查数据分析，揭示了底栖贝类群落的种类组成、优势物种分布、多样性特征及其与底质类型的相关性，同时基于贝类样品含碳率的测定结果，评估了其碳储量功能。（1）调查共发现底栖贝类34种，其中腹足类22种、双壳类12种；优势物种10种，其中金口蝾螺Turbo chrysostomus和亚洲棘螺Chicoreus asianus为各站位主要优势种；各断面贝类平均丰度为0.36 ind.·m-2，平均生物量为15.69 g·m-2。(2)各底栖贝类丰度与底质类型相关性分析表明，珊瑚礁贝类总丰度与珊瑚覆盖率呈负相关；黄口荔枝螺Reishia luteostoma和布目皱纹蛤Periglypta lacerata丰度与礁石底质占比呈显著正相关；金口蝾螺和阿文绶贝Mauritia arabica asiatica丰度与砂石底质占比呈显著正相关。(3)珊瑚覆盖度较低断面(如1、9和11)的底栖贝类群落多样性(H')、均匀度(J')及丰富度(d)等指数较高。(4)所获样品贝壳含碳率为12.1%-14.3%，软体组织含碳率为22.2%-44.4%；经测算，珊瑚礁区单位面积贝壳碳储量为1.47 g·m-2，软体组织碳储量为0.18 g·m-2，且不同断面贝类碳储量与丰度一致。研究结果可为珊瑚礁生态系统生物多样性保护及碳储量评估提供参考。 |
| 关键词: 珊瑚礁 底栖贝类 群落结构 底质 碳储量 |
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| Assessment of macrobenthic mollusk community structure and carbon content in coral reef area of Wuzhizhou Island |
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Liu Jingcan1, Zhou Duyan1, Qi Xiaoqing2, Hong Xin1, Sun Yunchao1, Wang Aimin1, Liu Chunsheng1, Lv Shuguo2
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1.Hainan University;2.Hainan Provincial Academy of Environmental Science
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| Abstract: |
| To investigate the characteristics of macrobenthic mollusk communities and their carbon storage capacity in the coral reef ecosystem of Wuzhizhou Island, 13 survey transects were uniformly set up around the island, and a systematic survey of macrobenthic mollusk resources was conducted. Through comprehensive analysis of the survey data, this study elucidated the species composition, dominant species distribution, biodiversity patterns, and habitat correlations of the mollusk communities, and evaluated their carbon sequestration function based on carbon content measurements of the collected samples.S The results showed that, (1) A total of 34 species of mollusks were identified, including 22 gastropods and 12 bivalves. Ten dominant species were identified using the Index of Relative Importance (IRI), withSTurbo chrysostomusSandSChicoreus asianusSbeing the primary dominants across all stations. The average abundance and biomass of mollusks were 0.36 ind./m2 and 15.69 g/m2, respectively. (2)SCorrelation analyses revealed a negative relationship between total mollusk abundance and coral cover. Reishia luteostomaSandSPeriglypta lacerataSshowed strong positive associations with rocky substrates, while T. chrysostomusSandSMauritia arabica asiaticaScorrelated positively with sandy substrates. (3)SBiodiversity indices, including diversity index (H"), evenness index (J") and richness (d), were relatively higher at transects with lower coral coverage (e.g., transects 1, 9, and 11). (4) The carbon content rates of the mollusk shells ranged from 12.1% to 14.3%, while those of the soft tissues ranged from 22.2% to 44.4%. The carbon storage per unit area in the shell component of Wuzhizhou Island carol reef area was 1.47 g.m-2, and that of the soft tissues was 0.18 g.m-2. Moreover, the spatial variations in carbon storage density were consistent with mollusk abundance patterns across different transects. These findings provide a reference for biodiversity conservation and carbon storage assessment in coral reef ecosystems. |
| Key words: coral reef benthic mollusk community structure substrate carbon storage |