摘要：
Riverine environments have been threatened by anthropogenic perturbations worldwide, whereby their fish assemblages have been modified by habitat changes and nonendemic species invasions. We assessed changes in fish assemblages by comparing the species presence in historical and contemporary fish data in the Yellow River from 1965 to 2015. The temporal change in species assemblages was found with increased nonendemic species and fewer natives. Fish species richness of the river declined 35.4% over the past fifty years. Moreover, the decreased mean Bray–Curtis dissimilarity among reaches suggested that the fish assemblages of different reaches in the Yellow River were becoming more similar over time. However, temporal patterns of fish assemblages varied among reaches. In the upper Yellow River, higher species richness and more invasive species were found than those in the historical record, while the lower reaches experienced significant species loss. Dam constructions, exotic fish invasions, and flow reductions played the vital role in structuring the temporal fish assemblages in the Yellow River. It is suggested that river basins which experienced different types and levels of stressors by anthropogenic perturbations can produce varied effects on their temporal trends of species assemblages.
作者：
Xie, J. Y.*;Xia, Y.;Yan, Y.;Liang, W. T.;Ren, C.
期刊：
Journal of Applied Ichthyology,2017年33(1):37-41 ISSN：0175-8659
通讯作者：
Xie, J. Y.
作者机构：
[Ren, C.; Xie, J. Y.; Xia, Y.; Liang, W. T.; Yan, Y.] Wuhan Polytech Univ, Sch Biol & Pharmaceut Engn, Wuhan, Hubei, Peoples R China.
通讯机构：
[Xie, J. Y.] W;Wuhan Polytech Univ, Sch Biol & Pharmaceut Engn, Wuhan, Hubei, Peoples R China.
摘要：
The reproductive biology of Triplophysa stenura, an indigenous cyprinid species from the Qushui County in the middle of the Yarlung Tsangpo River in the Tibetan Plateau, China, was investigated by bimonthly sampling from May 2014 to April 2015 using electrofishing. The gonadosomatic index (GSI) of T. stenura differed significantly between males and females over the seasonal trend, indicating that spawning extends from March (shortly after the ice melts) to May, as observed for indigenous species in response to environmental conditions on the cold plateau. Average oocyte diameter was 0.66 ± 0.13 mm, whereby the oocyte diameter distribution exhibited a clear seasonal pattern as the temporal pattern of GSI. Absolute fecundity of T. stenura was 3999 eggs/individual, which increased significantly with the increase in fish size and gonad weight, demonstrating the relationship of an exponential equation between them.
期刊：
Russian Journal of Genetics,2012年48(10):1029-1034 ISSN：1022-7954
通讯作者：
Xie, J. Y.
作者机构：
[Xie, J. Y.] Wuhan Polytech Univ, Sch Biol & Pharmaceut Engn, Wuhan 430023, Peoples R China.
通讯机构：
[Xie, J. Y.] W;Wuhan Polytech Univ, Sch Biol & Pharmaceut Engn, Wuhan 430023, Peoples R China.
关键词：
Freshwater Lake;Taihu Lake;Discriminant Function Analysis;Yellow Perch;Chaohu Lake
摘要：
Population structure of the important commercial fish, Coilia ectenes, was investigated in samples from three freshwater lakes in the Eastern China using a multivariate approach of morphometrics and mitochondrial DNA control region sequencing. A total of eighteen morphological distances of truss method and eight morphometric variables were taken from each fish. Multivariate analyses of the morphometric data revealed significant morphological differences among the three lake populations, especially for those samples from Taihu Lake. Discriminant functions were used to compare sites, and these permitted an 83% success rate in distinguishing fish from the three sites. However, no obviously geographical differentiation was found among those populations of C. ectenes based on the genetic data. In the AMOVA analysis, only 2.2% genetic variability came from different populations, and most of them were present within the sub-populations. Experience a recent population expansion and some movement of fish among those areas, quite possibly enough to bring about relative genetic homogeneity, but there is insufficient to prevent the three populations from differing phenotypically. The diversified environmental factors may be playing an important role in shaping morphological variations among those populations.
