Vertical distribution and feeding of Thalia democratica on the Agulhas Bank during March 1994
Vertical distribution and feeding of Thalia democratica on the Agulhas Bank during March 1994
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DOI：
10.1017/s0025315400071824
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发表时间：
1997-05-01
影响因子：
1.2
通讯作者：
Gibbons, MJ
中科院分区：
文献类型：
--
作者：
Gibbons, MJ
1994年3月，在南非阿古拉斯滩的野外研究了大口海棠(Thalia democatica，Thalia Democatica)的垂直迁移和就地取食。Dhalia Democatica在整个研究期间没有显示DVM，聚集体和孤子大多局限在水柱的上层。海棠没有表现出明显的摄食节律，色素含量随着盐分大小的增加而增加。色素含量最高的单株出现在叶绿素最大值。对放牧影响的估计随着盐分丰度和肠道通过时间的不同而不同，从不到浮游植物生产力的1%到超过100%不等。
Diel vertical migration (DVM) and in situ feeding of Thalia democratica (Tunicata: Thaliacea) was studied in the field (Agulhas Bank, South Africa) over a 48 h period in March 1994. Thalia democratica did not display DVM, and both aggregates and solitaires were mostly confined to the upper layers of the water column throughout the study period. Thalia democratica did not display any discernible diel feeding rhythm, and pigment content increased with salp size. Individuals with greatest pigment content were found at the chlorophyll maximum. Estimates of grazing impact varied with salp abundance and gut passage time, ranging from less than 1% to greater than 100% of phytoplankton productivity.