Diversity and distribution of tintinnid ciliates along salinity gradient in the Pearl River Estuary in southern China
Diversity and distribution of tintinnid ciliates along salinity gradient in the Pearl River Estuary in southern China
复制标题
华南珠江口丁丁纤毛虫沿盐度梯度的多样性及分布
DOI：
10.1016/j.ecss.2019.106268
复制
发表时间：
2019-10-15
影响因子：
2.8
通讯作者：
Xiao, Tian
中科院分区：
文献类型：
--
作者：
Li, Haibo;Wang, Chaofeng;Xiao, Tian
从珠江口上游淡水到多盐水域，共进行了6次(2014年10月29日10次，2015年6月30日11次，2017年3月15日4月1日)调查。共鉴定出金龟科15属43种。淡水、微咸水和海洋物种沿盐度梯度依次出现。玛氏金线虫、管状金线虫和河扁豆是淡水物种。其中有14种为淡咸水种，15种为海洋种。淡水物种的首选盐度为<；3，且淡水物种丰度沿盐度梯度递减。微咸水物种的首选盐度范围为3-23。微咸水物种丰度高出现在中盐区，并向少盐区和多盐区减少。随着盐度的降低，海洋物种丰度急剧下降，当盐度为-15时，海洋物种丰富度很少。在低盐度地区，Tintinnid物种丰富度低。随着盐度的升高，不同季节的水母类物种丰富度表现出不同的变化规律。Tintinnid丰度沿盐度梯度呈双峰型。第一个丰度峰主要由微咸水物种贡献，出现在盐度为<；15的地方；第二个丰度峰出现在盐度为25或>；30左右的地方，主要由海洋物种贡献。根据不同盐度类型的丰度百分率变化，划分出低盐度、微咸水和沿海丁虫群落。这些群落的复杂性随着盐度梯度的增加而增加。
Tintinnid community structure in the Pearl River Estuary were investigated 6 times (10, 29 October 2014; 11, 30 June 2015 and 15 March, 1 April 2017) from upstream freshwaters to polyhaline waters. A total of 43 tintinnid species in 15 genera were identified. Freshwater, brackish and marine species occurred in sequence along salinity gradient. Tintinnopsis mayeri, T. tubulosa and Tintinnidium fluviatile were freshwater species. Fourteen and 15 tintinnid species were considered as brackish and marine species, respectively. The preferred salinity of freshwater species was < 3, and the abundance of freshwater species decreased along salinity gradient. Preferred salinity of brackish species ranged in 3-23. High abundance of brackish species occurred at mesohaline regions and decreased towards both oligohaline and polyhaline regions. Marine species abundance dropped sharply with the decrease of salinity, and seldom appeared when salinity was < 15. Tintinnid species richness was low at low salinity areas. With the increase of salinity, tintinnid species richness showed different variation patterns in different seasons. Tintinnid abundance showed bimodal-peak along salinity gradient. The first abundance peak was mainly contributed by brackish species and occurred where salinity was < 15. While the second abundance peak appeared where salinity was around 25 or > 30, which was mainly contributed by marine species. Low salinity, brackish and coastal tintinnid communities were divided based on the abundance percentage variations of different tintinnid types. Complexities of those communities increased along salinity gradient.