Feeding by Antarctic Krill, Euphausia superba: Does Size Matter?
Feeding by Antarctic Krill, Euphausia superba: Does Size Matter?
复制标题
南极磷虾、南极磷虾的喂养：大小重要吗？
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
R. Ross
中科院分区：
文献类型：
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作者：
L. Quetin;R. Ross
对全长25~30 mm的南极磷虾Euphausia Superba(全长25~30 mm)、羽状硅藻三角褐指藻(当量球径=4μm)、鞭毛藻等鞭藻(球体直径=4μm)和两种中心硅藻(球径分别为30μm和40μm)的单藻培养物进行了研究。实验在−0.5℃下进行3-4d，经过4d的初步驯化，摄食反应随浮游植物细胞的大小而变化。对4种浮游植物的最大清除速率分别为：103ml动物−1h−1,167ml动物−1h−1,281ml动物−1h−1,357ml动物−1h−1。所有个体的最大清除速率与计算的细胞球面半径平方(CSR)2成正比，方程为y=61.75+0.233 CSR2，其中y是清除速率(N=20，r=0.694)。球藻的临界浓度不能达到25000个细胞毫升−1，这表明球藻不能非常有效地摄食小圆形细胞。由于最大清除速率的变化与被摄取的浮游植物的大小密切相关，而不是与物种有关，因此细胞的物理尺寸而不是化学成分可能是影响最大清除速率的最重要参数。这些摄食反应对超级巨藻的能量学和磷虾赖以生存的浮游植物群落的改造都很重要。
Antarctic Krill, Euphausia superba (25–30 mm total length), were fed uni-algal cultures of a flagellate, Isochrysis galbana (= 4 μm sphere), a pennate diatom, Phaeodactylum tricornutum (equivalent spherical diameter (ESD) = 4 μm), and 2 centric diatoms, Ditylum brightwellii (ESD = 30 μm) and Thalassiosira eccentrica (ESD = 40 μm). Experiments were conducted at −0.5°C for 3–4 d, after an initial acclimation period of 4 d. The feeding response varied with the size of the phytoplankton cell. The maximum clearance rates for any individual feeding on the 4 phytoplankton species were: 103 ml animal−1 h−1 for I. galbana, 167 ml animal−1 h−1 for P. tricornutum,281 ml animal−1 h−1 for D. brightwellii, and 357 ml animal−1 h−1 for T. eccentrica. The maximum clearance rates of all individuals were directly proportional to the calculated spherical radius squared (CSR)2 of the cells, described by the equation y = 61.75 + 0.233 CSR2 where y is the clearance rate (N = 20, r = 0.694). No critical concentration was established for I. galbana at concentrations as great as 25000 cells ml−1, indicating that E. superba does not feed very effectively on small round cells. Because the variation in the maximum clearance rate is closely linked to the size, but not the species, of phytoplankton being ingested, the physical dimensions, not the chemical composition, of the cell are probably the most important parameters affecting the maximum clearance rate. These feeding responses are important both to the energetics of E. superba, and to the modification of the phytoplankton community in which Krill feed.