2007年10月南海北部浮游纤毛虫的丰度和生物量

报道2007年10月南海北部海域(21°25.47′N 17°24.95′N,109°28.86′E 113°13.01′E)纤毛虫丰度和生物量的水平分布及砂壳纤毛虫的种丰富度。包括了13个断面的82个站位,Rosette采水器采水,水深低于15 m的站位采0,5 m和10 m;小于30 m站位,采0,10 m和底层;大于30 m的站位,采0,10,30 m和底层。纤毛虫丰度为0 5757 ind./L,平均(848±776)ind./L。无壳纤毛虫占绝对优势,其丰度占纤毛虫总丰度的比例平均为(91.9±9)%;纤毛虫生物量为0 12.09μg C/L,平均是(1.2±1.54)μg C/L,无壳纤毛虫的生物量平均为(0.94±1.27)μg C/L,占纤毛虫总生物量的78.6%。共发现砂壳纤毛虫16个属,49种,拟铃虫最多,具有一定的季节性。纤毛虫水体(40 m到表层)丰度为6.4×1069.1×107ind./m2,平均是(3.6×106±1.4×106)ind./m2;水体生物量3.6 195.8 mg C/m2,平均(48.1±33.7)mg C/m2。纤毛虫多分布于近岸浅水区(高温低盐,高Chl a),最大丰度要高于我国其他海区,不是Chl a最高的地方纤毛虫的丰度也最大,纤毛虫丰度最大时Chl a偏低。

Ciliate abundance and biomass in northern South China Sea in October 2007

The abundance and biomass of ciliate and species richness of tintinnids in the northern South China Sea (21°25. 47' N- 17°24.95'N, 109°28.86' E-113°13.01'E) were investigated in October, 2007, across 13 sections over 82 stations. Sampling was conducted with Rosette at 0, 5, and 10 m in the area shallower than 15 m; at 0, 10, and the bottom in the case of < 30 m in depth ; or at 0, 10, 30, and the bottom if the depth > 30 m. The results show that 49 species of tintinnids were identified including 16 genera. Genus Tintinnopsis was dominant and seasonal in abundance. The ciliates abundance ranged from 0 to 5757 ind./L in average of (848 ± 776) ind./L, of which aloricate ciliates took (91.9 ± 9) %. The biomass of all ciliates was 0 - 12.09 μg C/L in average of 1.2 - 1.54 μg C/L, of which aloricate ciliates took (0. 94 ± 1.27)μg C/L, or 78.6% to the total. In water column, the abundance of ciliates was 6.4 × 10~6- 9.1 × 10~7 ind./m~2 in average of (3.6 × 10~6 ± 1.4 × 10~6 ind./m~2 ; and the biomass was 3.6 - 195.8 mg C/m~2 in average of (48.1 ± 33.7) mg C/m~2. Ciliates distributed mainly near coastal shallow waters of warm and less salty with more Ch1 a. The maximum abundance of ciliate in the study was higher than those in other parts of China seas. However, the maximum abundance of ciliates in the study area corresponded occasionally to a low Ch1 a concentration.