Relationships between environmental variables and free-living nematode communities in seasonally flooded wetlands.

T. Tran, Y. Nguyen, L. T. Pham, Bijeesh KV, S. Hoang, Q. Ngô
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Abstract

The Lo Go-Xa Mat is a national park in the southeastern region of Vietnam, which has a particularly high biodiversity and it includes different wetlands which are unique diverse in species composition. It can be categorized into two types: temporarily-seasonally and permanently flooded wetlands. Ta Not grassy marsh is representative of the seasonally flooded wetland. Whilst the diversity and ecology of plants and mammals are well documented, little or no information of the benthic ecology in the seasonally flooded wetland exist. This study aims to provide a new database of the nematode’s structure in the seasonally flooded wetland and its relation with environmental variables as well as detection of the ecological quality, considering nematodes as bioindicators. This work is the first investigation on nematodes communities in associate with some environmental variables in the Ta Not grassy marsh. The results showed that free-living nematodes in the Ta Not seasonally flooded grassy marsh are characterized by the high density (ranged from 235.01 to 898.43 inds.10cm-2) but rather low diversity. More specifically, the genus richness (S) ranged from 8.20 to 8.60. The observed Margalef’s species richness (d) was ranging from 1.07 to 1.53 and the Shannon-Wiener index (H') was measured from 2.36 to 2.52. In addition, the Pielou's evenness (J′) ranged from 0.55 to 0.68 and the Hill indices indicated average values ranging between 5.46- 5.84 for N1, between 4.32-4.60 for N2, and between 2.64-2.86 for Ninf. Specifically, our results indicated that deep level, pH, and NH4+ showed a significant correlation with the nematode density and bio-indices. The sediment of the Ta Not grassy marsh was assessed as in good conditions in all stations based on the Maturity Index of nematodes.
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季节性淹水湿地环境变量与自由生活线虫群落的关系
Lo Go-Xa Mat是越南东南部地区的一个国家公园,拥有特别高的生物多样性,它包括不同的湿地,物种组成独特多样。它可以分为两种类型:临时季节性和永久淹没湿地。塔诺草沼泽是季节性淹水湿地的代表。虽然植物和哺乳动物的多样性和生态有充分的记录,但关于季节性洪水湿地的底栖生物生态的资料很少或根本没有。本研究旨在以线虫为生物指标,建立季节性淹水湿地线虫结构及其与环境变量的关系以及生态质量检测的新数据库。本研究首次对塔诺草地湿地线虫群落与环境变量的关系进行了研究。结果表明:塔中季节淹水草地湿地线虫密度较高(235.01 ~ 898.43 ind.10 cm-2),多样性较低;属丰富度(S)在8.20 ~ 8.60之间。Margalef的物种丰富度(d)为1.07 ~ 1.53,Shannon-Wiener指数(H)为2.36 ~ 2.52。Pielou均匀度(J′)为0.55 ~ 0.68,Hill指数平均值N1为5.46 ~ 5.84,N2为4.32 ~ 4.60,Ninf为2.64 ~ 2.86。结果表明,深度、pH和NH4+与线虫密度和生物指数呈显著相关。利用线虫的成熟指数,各监测站的沉积物状况均为良好。
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来源期刊
CiteScore
7.90
自引率
2.90%
发文量
11
审稿时长
8 weeks
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