西藏麦地卡湿地不同水文期原生动物优势种生态位及其种间联结性

doi:10.11707/j.1001-7488.20210213

Abstract

Abstract:

Objective: This study aims to explore the niche and interspecific association of dominant species of protozoa community under different hydrologic periods in the Mitika Wetland National Nature Reserve of Tibet, China, to reveal the resource utilization status, functional status and ecological adaptability of the dominant species of protozoa community in different hydrologic periods, and to provide basis for further study on the stability and spatial distribution pattern of protozoan community in Mitika Wetland. Method: According to the characteristics of ecological environment, functional zoning and gradient structure of Mitika wetland, 14 representative sampling sites were set for sample collection. A total of 168 water samples were collected using 25 # standard plankton net in July (wet season) and October (dry season), 2018. The niche and interspecific association among the dominant species were analyzed via the niche breadth, niche overlap, ecological response rate, overall interspecific connections, χ²-test, association coefficient (AC), percentage co-occurrence (PC) and percentage point correlation (φ). Result: 1) A total of 141 species of protozoa were identified in wet season of Mitika wetland and 138 species were identified in dry season. Among them, there are 9 dominant species, belonging to 2 phyla and 5 genera. Cryptomonas obovate and Difflugia globulosa were the dominant species in two hydrological periods. The frequency, abundance and dominance of dominant species were different in different hydrological periods. 2) The dominant species of protozoa in the Mitika wetland are composed of broad niche species, medium niche species and narrow niche species, and the broad niche species were dominant. The result showed that there were significant differences in niche overlap values between species. The maximum and minimum values were 1 and 0.001, respectively. Moreover, the degree of niche overlap was not high, and the inter specific competition was weak; the sum of ecological response rates in the two hydrological periods was positive, indicating that the protozoan community was in the development stage. 3) The dominant species in the two hydrological periods of Mitika wetland were in general positively correlated with each other, however, the correlation among the most species was not significant (χ² > 3.841), and the interspecific relationship was relatively loose. Conclusion: Among the dominant species of protozoa community in the Mitika wetland, Bodo sp. in wet season, Cryptomonas rostrata in dry season and Difflugia globulosa in the two hydrological periods have strong adaptability to the environment, and have a wide range of ecological adaptation; while Hyalosphenia minuta in wet season and Vorticella campanula in dry season are more sensitive to the changes of water environment conditions, and their adaptability is weak. The niche overlap and breadth characteristics of some dominant species are not consistent. For example, the overlap value of Cryptomonas pyrenoidifera and Cryptomonas rostrata in dry season was high, but the niche breadth was small. The species composition and dominant species structure of protozoa community in the Mitika wetland are relatively stable and have a positive succession trend, but the relative dynamic balance between dominant species and between dominant species and environment is not reached, and the protozoa community is still in the development stage and has not yet reached the top stage of succession.

Key words: Mitika wetland, protozoa, dominant species, niche, interspecific association, Tibet

CLC Number:

Ruizhi An,Peng Zhang,Zhen Da,Nanqian Qiao,Qiuyue Tang,Sang Ba. Niche and Interspecific Association of Dominant Protozoan Species Under Different Hydrologic Periods in the Mitika Wetland of Tibet, China[J]. Scientia Silvae Sinicae, 2021, 57(2): 126-138.

Figures/Tables 10

Fig.1

Table 1

Basic information of sampling sites in the Mitika Wetland"

编号 No.	样点名称 Sample name	经度 Longitude	纬度 Latitude	海拔 Altitude/m	水温 WT/℃	pH	盐度 Salt/(mg·L^-1)	溶解氧 DO/(mg·L^-1)	生境类型 Habitat type
M1	麦地藏布上游Upper Reaches of the Miti Tsangpo	93°02′49.21″	31°05′20.91″	4 944	8.22±4.28	7.81±0.45	60.00±15.07	6.79±0.85	河流River
M2	热达曲Redaqu	92°57′28.44″	31°05′48.58″	4 885	6.00±3.23	7.65±0.17	89.45±13.89	7.64±0.95	河流River
M3	瓦瑞措Waruicuo	92°56′50.04″	31°06′40.62″	4 888	8.32±5.09	8.35±0.46	26.47±4.13	6.61±1.4	湖泊Lake
M4	玛荣曲Marongqu	92°51′24.12″	31°05′31.62″	4 869	11.17±4.03	8.01±0.59	62.73±10.27	6.22±0.65	河流River
M5	秋朗曲Qiulangqu	92°50′58.60″	31°06′43.65″	4 901	7.53±2.67	8.16±0.47	63.47±2.3	6.88±0.74	河流River
M6	措热措Cuorecuo	92°50′29.20″	31°06′38.74″	4 898	9.4±2.73	8.26±0.70	66.8±0.63	6.29±0.95	湖泊Lake
M7	松董措Songdongcuo	92°48′55.39″	31°06′55.65″	4 915	10.47±5.11	7.69±0.06	47.83±7.57	6.33±0.94	湖泊Lake
M8	松董曲Songdongqu	92°46′47.31″	31°06′57.71″	4 898	11.23±2.75	7.65±0.16	59.27±11	6.09±0.69	河流River
M9	措董措Cuodongcuo	92°42′07.42″	31°06′11.36″	5 006	10.65±2.45	7.70±0.30	55.35±20.08	6.35±0.52	湖泊Lake
M10	东德措Dongdecuo	92°56′47.79″	30°58′54.95″	4 898	10.00±1.17	7.33±0.07	39.95±3.37	6.37±0.29	湖泊Lake
M11	措査措Cuozhacuo	92°49′40.97″	31°00′19.92″	4 828	6.05±4.32	7.41±0.14	60.78±1.89	5.72±1.4	湿地Marsh
M12	乌铅曲Wuqianqu	92°48′35.26″	30°58′37.93″	4 833	7.00±5.70	7.76±0.19	37.33±2.4	7.13±0.44	河流River
M13	乌穷措Wuqiongcuo	92°50′02.65″	30°56′18.33″	4 885	9.35±2.52	7.48±0.16	36.77±0.07	6.25±0.43	湖泊Lake
M14	麦地藏布下游Lower reaches of the Miti Tsangpo	92°36′46.19″	30°57′02.79″	4 744	7.80±3.40	7.42±0.03	58.97±9.04	7.02±0.18	河流River

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门 Phylum	优势种 Dominant species	丰水期Wet season			枯水期Dry season
门 Phylum	优势种 Dominant species	f_i	A/(10⁴cells·L^-1)	Y	f_i	A/(10⁴cells·L^-1)	Y
肉鞭门 Sarcomastigophora	波豆虫属Bodo sp.	0.571	2.154	0.108	—	—	—
	倒卵形隐滴虫Cryptomonas obovata	0.571	0.677	0.034	0.357	0.547	0.034
	卵形隐滴虫C. ovata	—	—	—	0.714	1.432	0.179
	蛋白核隐滴虫C. pyrenoidifera	—	—	—	0.500	0.478	0.042
	回转隐滴虫C. reflexa	—	—	—	0.500	0.478	0.042
	吻状隐滴虫C. rostrata	—	—	—	0.571	0.609	0.061
	球形砂壳虫Difflugia globulosa	0.857	0.416	0.031	0.929	0.977	0.159
	小茄壳虫Hyalosphenia minuta	0.500	0.758	0.033	—	—	—
纤毛门Ciliophora	钟形钟虫Vorticella campanula	—	—	—	0.286	1.202	0.060

编号No.	丰水期Wet season	B_i	编号No.	枯水期Dry season	B_i
W01	波豆虫属一种Bodo sp.	0.445	D01	卵形隐滴虫C. ovata	0.227
W02	倒卵形隐滴虫C. obovata	0.132	D02	球形砂壳虫D. globulosa	0.272
W03	小茄壳虫H. minuta	0.101	D03	吻状隐滴虫C. rostrata	0.269
W04	球形砂壳虫D. globulosa	0.376	D04	钟形钟虫V. campanula	0.141
—	—	—	D05	蛋白核隐滴虫C. pyrenoidifera	0.197
—	—	—	D06	回转隐滴虫C. reflexa	0.197
—	—	—	D07	倒卵形隐滴虫C. obovata	0.187

编号No.	W01	W02	W03	W04
W01	1
W02	0.114	1
W03	0.077	0.012	1
W04	0.456	0.338	0.089	1

编号No.	D01	D02	D03	D04	D05	D06	D07
D01	1
D02	0.124	1
D03	0.173	0.371	1
D04	0.013	0.062	0.001	1
D05	0.133	0.038	0.705	0.001	1
D06	0.133	0.038	0.705	0.001	1.000	1
D07	0.008	0.146	0.558	0.001	0.645	0.645	1

编号No.	丰水期Wet season		编号No.	丰水期Wet season
编号No.	ΔO_ik	R	编号No.	ΔO_ik	R
W01	0.415	1.072	D01	-6.897	-0.033
W02	-0.312	-0.423	D02	-5.551	-0.049
W03	-1.461	-0.069	D03	6.583	0.041
W04	1.358	0.277	D04	-10.452	-0.013
—	—	—	D05	6.650	0.030
—	—	—	D06	6.650	0.030
—	—	—	D07	3.019	0.062

Niche and Interspecific Association of Dominant Protozoan Species Under Different Hydrologic Periods in the Mitika Wetland of Tibet, China

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水文期Hydrologic period	σ_T²	S_T²	VR	W	χ²临界值χ² critical value	测度结果Measurement results
丰水期Wet season	0.332	0.816	2.456	34.386	(6.570 6, 23.684 8)	显著正关联Significantly positive correlated
枯水期Dry season	0.711	2.265	3.184	44.582	(6.570 6, 23.684 8)	显著正关联Significantly positive correlated

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