Cladoceran body size and vulnerability to copepod predation
Cladoceran body size and vulnerability to copepod predation
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枝角类动物的体型和对桡足类捕食的脆弱性
DOI：
10.4319/lo.1994.39.2.0419
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发表时间：
1994
影响因子：
4.5
通讯作者：
G. Umaña
中科院分区：
文献类型：
--
作者：
Z. Gliwicz;G. Umaña
我们研究了五种近缘枝角类中由捕食性桡足类(粗刺棘环类)引起的物种相关和年龄相关的死亡率，这些枝角类的个体大小各不相同。来自克隆培养的所有五种动物在有或不含有自然密度的棘足类成虫和桡足类(40-50个桡足类升−1)的桡足类感染的围栏中暴露1、2或4d。在这五个物种中的每一个物种中，1日龄的新生儿最容易受到桡足类的影响，而成年最不容易受到影响。小体水蚤和网纹水蚤在成熟前仍然脆弱，但大型大型水蚤的敏感度在3日龄和5日龄动物中急剧下降，7日龄成虫对桡足类捕食具有免疫力。
We examined species-related and age- related mortality caused by a predaceous copepod (Acanthocyclops robustus) in five closely related cladocerans representing a wide spectrum of body size. Animals of all five species from clonal cultures were exposed for 1, 2, or 4 d in medium from a copepod-infested enclosure that either did or did not contain natural densities of Acanthocyclops adults and copepodites (40–50 copepods liter−1). In each of the five species, the 1-d-old neonates were most, and adults least, vulnerable to the copepods. Small-bodied Daphnia cucullata and Ceriodaphnia reticulata remained vulnerable until maturation, but the susceptibility of large Daphnia magna drastically decreased in 3- and 5-d-old animals, and 7-d-old adults were immune to copepod predation.