期刊
AQUATIC MICROBIAL ECOLOGY
卷 22, 期 1, 页码 57-68出版社
INTER-RESEARCH
DOI: 10.3354/ame022057
关键词
planktonic ciliate; Halteria; oligotrichs; growth; feeding behaviour; functional response; prey selection
In laboratory experiments, we studied the growth and feeding characteristics of Halteria cf. grandinella, a common and widespread oligotrichous ciliate in freshwater plankton. Particle-size-dependent feeding rates were measured with fluorescent latex micropheres (0.22 to 4.23 mu m diameter) and natural food organisms (bacteria, Synechococcus sp., Chlorella minutissima) in short-term feeding experiments. N. cf. grandinella ingested all but the smallest (0.22 mu m) particles offered and demonstrated a concentration dependent type-2 functional response. Maximum clearance rates were obtained with 2.76 mu m latex beads (0.6 mu l h(-1)). Clearance rates declined for smaller and larger particle sizes but even with the suboptimal size classes, 0.47 and 1 mu m, high maximal ingestion rates were measured (19 and 13 beads ciliate(-1) min(-1), respectively). The maximum clearance rates for bacteria and algae were close to those of similar sized latex beads, and no discrimination of particles based on properties other than size could be detected. The physiological state of the ciliates did not seem to have an impact on the relative pattern of the particle-size-dependent functional response curves, but the absolute feeding rates decreased nearly 10-fold after prolonged starvation. The experiments demonstrated that this small filter-feeding ciliate is an omnivorous species which is able to efficiently exploit the planktonic prey size spectrum from 0.5 to 5 mu m, covering heterotrophic and autotrophic pico- and nanoplankton in the diet.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据