Biodiversity Science ›› 2017, Vol. 25 ›› Issue (1): 53-61.doi: 10.17520/biods.2016259

• Orginal Article • Previous Article     Next Article

Biodiversity and distribution patterns of Triplophysa species in the northeastern margin of the Tibetan Plateau

Chenguang Feng1, 2, 3, Chao Tong1, 2, 3, Renyi Zhang1, 2, Guogang Li1, 2, Kunyuan Wanghe1, 2, 3, Yongtao Tang1, 2, 3, Cunfang Zhang1, 2, *(), Kai Zhao1, 2, *()   

  1. 1 Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008
    2 Laboratory of Plateau Fish Evolutionary and Functional Genomics, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008
    3 University of Chinese Academy of Sciences, Beijing 100049
  • Received:2016-09-12 Accepted:2016-12-30 Online:2017-02-08
  • Zhang Cunfang,Zhao Kai E-mail:cfzhang@nwipb.cas.cn;zhaokai@nwipb.cas.cn

The northeastern region of the Tibetan Plateau is a region with high genetic diversity for endemic species. To comprehensively document the patterns of diversity and the distribution of Triplophysa species in this area, we probed the allocation of Triplophysa species using field surveys from 2012 to 2015. We found that areal shrinkage and fragmentation had occurred in some species. Species richness in this area was uneven. But the middle to upper reaches of the Heihe River, Datong River and Taohe River were uncommon areas with high species-richness and high biodiversity. Along altitudinal gradients, species richness presented a unimodal pattern and peaked at mid-elevations (2,200-2,400 m), which was the transition area between two community zones with high species richness. The unimodal pattern fit Lomolino’s prediction regarding species density and altitude. Biodiversity indices displayed uniform patterns with species richness and elevation. Consistent with most studies, the unimodal shape may be the universal pattern of biodiversity distribution along elevational gradients in the Tibetan Plateau and its adjacent highlands. The intermediate elevational regions should be conservation priorities.

Key words: Tibetan Plateau, Triplophysa, biodiversity, distribution pattern, elevational gradient, conservation

Fig. 1

Drainage systems of investigation area. Gray lines in right part: 1, Damaying River; 2, Ganzi River; 3, Taohe River; 4, Daxia River; 5, Zhuanglang River; 6, Datong River; 7, Huangshui River; 8, Guide; 9, Maqu; 10, Bailong River; 11, Upper reaches of Jialing River."

Table 1

Fish diversity of Triplophysa species in northeastern margin of Tibetan Plateau (mean ± SD)"

水系
Basin
水系单元
Basin unit
物种丰富度
Species richness
Shannon-Wiener指数
Shannon-Wiener index
Pielou指数
Pielou index
Simpson指数
Simpson index
河西
Hexi rivers
疏勒河干流 Shule River 4 0.690 ± 0.114 0.727 ± 0.074 0.553 ± 0.047
疏勒河附属水体 Tributaries of Shule River 2 0.560 ± 0.217 0.810 ± 0.312 0.556 ± 0.250
黑河干流 Heihe River 6 1.136 ± 0.213 0.842 ± 0.078 0.350 ± 0.064
黑河附属水体—大马营河 Damaying-tributary of Heihe River 4 1.100 0.790 0.346
黑河附属水体—其他 Other tributaries of Heihe River 2 0.320 ± 0.157 0.463 ± 0.229 0.806 ± 0.117
石羊河干流 Shiyang River 4 1.035 ± 0.093 0.893 ± 0.121 0.364 ± 0.035
石羊河附属水体 Tributaries of Shiyang River 2 0.640 ± 0.044 0.923 ± 0.064 0.545 ± 0.040
小计 Subtotal 7
青海湖
Lake Qinghai
甘子河 Ganzi River 2 0.620 ± 0.028 0.890 ± 0.042 0.539 ± 0.054
入湖河流 Tributaries of Qinghai Lake 2 0.673 ± 0.029 0.973 ± 0.046 0.418 ± 0.075
小计 Subtotal 4
黄河上游
Upper reaches
of Yellow River
洮河 Taohe River 8 1.198 ± 0.246 0.848 ± 0.122 0.337 ± 0.072
大夏河 Daxia River 4 0.573 ± 0.107 0.633 ± 0.261 0.589 ± 0.229
庄浪河 Zhuanglang River 4 0.570 0.410 0.723
大通河 Datong River 6 1.390 ± 0.014 0.820 ± 0.057 0.293 ± 0.019
湟水河 Huangshui River 7 1.060 ± 0.159 0.753 ± 0.130 0.368 ± 0.103
贵德至玛曲段 Guide-Maqu section 4 0.777 ± 0.168 0.950 ± 0.053 0.417 ± 0.086
玛曲段 Maqu section 6 0.645 ± 0.134 0.515 ± 0.021 0.674 ± 0.049
玛曲至玛多段 Maqu-Maduo section 3 0.530 ± 0.382 0.545 ± 0.247 0.667 ± 0.269
小计 Subtotal 12
渭河 Weihe River 渭河上游 Upper reaches of Weihe River 4 1.010 ± 0.113 0.790 ± 0.098 0.419 ± 0.045
嘉陵江
Jialing River
白龙江 Bailong River 4 0.845 ± 0.247 0.950 ± 0.028 0.446 ± 0.104
嘉陵江上游 Upper reaches of Jialing River 3 0.990 0.900 0.392
小计 Subtotal 5

Fig. 2

UPGMA cluster of basin units in study area based on component of Triplophysa species. YH1 and YH2 are the sections above and below of Guide in upper reaches of Yellow River."

Fig. 3

The species richness pattern of Triplophysa species in northeastern margin of Tibetan Plateau, serial number in accordance with Fig. 1."

Fig. 4

Elevational distribution pattern of species richness of Triplophysa in northeastern margin of Tibetan Plateau"

Fig. 5

The relationship between biodiversity indices and elevation"

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