The importance of crustacean zooplankton in structuring rotifer and phytoplankton communities: An enclosure study
The importance of crustacean zooplankton in structuring rotifer and phytoplankton communities: An enclosure study
复制标题
DOI：
10.1093/plankt/18.10.1897
复制
发表时间：
1996-10-01
影响因子：
2.1
通讯作者：
Fussmann, G
中科院分区：
文献类型：
--
作者：
Fussmann, G
1993年春季清水期，在中营养Schohsee（普隆，西德）进行了围护实验，以评估甲壳类浮游动物对轮虫和浮游植物群落的影响。在甲壳类浮游生物中，类足类和圆类足类数量丰富，但本实验中水蚤的密度最高。群体轮虫 Conochilus unicornis 不受甲壳类浮游生物的影响。当大型浮游动物被排除在围栏之外时，两种最丰富的物种，梳状纲毛藻（Synchaeta pectinata）和蜗形龟甲藻（Keratella cochlearis），呈指数增长，但当甲壳类动物存在时，它们的数量并没有增加。在该田间实验中可以可靠地确定 K. cochlearis 的出生率和死亡率，这表明该轮虫物种主要受剥削性竞争而非机械干扰或捕食控制。 “longispina”水蚤通常选择性地吃较小的纤毛虫和藻类，从而剥夺了轮虫的浮游植物资源。无论甲壳类动物是否存在，占主导地位的藻类——金藻类恐龙——都会增加，但尽管其细胞大小和群体组织相当大，但似乎在一定程度上被吃掉了。
During the spring clear-water phase of 1993, an enclosure experiment was performed in the mesotrophic Schohsee (Plon, FRG) in order to assess the impact of crustacean zooplankton on the rotifer and phytoplankton community. Among the crustacean plankton, calanoid and cyclopoid cope pods were abundant, but Daphnia 'longispina' reached the highest densities in this experiment. The colonial rotifer Conochilus unicornis was not affected by crustacean plankton. The two most abundant species, Synchaeta pectinata and Keratella cochlearis, increased exponentially when macrozooplankton had been excluded from the enclosures, but did not increase when crustaceans were present. Birth and death rates of K. cochlearis could be reliably determined in this field experiment, suggesting that this rotifer species was mainly controlled by exploitative competition rather than by mechanical interference or predation. Daphnia 'longispina' generally grazed selectively on the smaller ciliates and algae, thus depriving the rotifers of their phytoplankton resources. ?he dominant alga, the chrysophycean Dinobryon, increased, whether crustaceans were present or not, but appeared to be grazed upon to a certain extent despite its considerable cell size and colonial organization.