Aberle N, Lengfellner K, Sommer U
IFM-GEOMAR Leibniz Institute of Marine Sciences, Düsternbrooker Weg 20, 24116, Kiel, Germany.
Oecologia. 2007 Jan;150(4):668-81. doi: 10.1007/s00442-006-0540-y. Epub 2006 Sep 9.
This study aimed at simulating different degrees of winter warming and at assessing its potential effects on ciliate succession and grazing-related patterns. By using indoor mesocosms filled with unfiltered water from Kiel Bight, natural light and four different temperature regimes, phytoplankton spring blooms were induced and the thermal responses of ciliates were quantified. Two distinct ciliate assemblages, a pre-spring and a spring bloom assemblage, could be detected, while their formation was strongly temperature-dependent. Both assemblages were dominated by Strobilidiids; the pre-spring bloom phase was dominated by the small Strobilidiids Lohmaniella oviformis, and the spring bloom was mainly dominated by large Strobilidiids of the genus Strobilidium. The numerical response of ciliates to increasing food concentrations showed a strong acceleration by temperature. Grazing rates of ciliates and copepods were low during the pre-spring bloom period and high during the bloom ranging from 0.06 (Delta0 degrees C) to 0.23 day(-1) (Delta4 degrees C) for ciliates and 0.09 (Delta0 degrees C) to 1.62 day(-1) (Delta4 degrees C) for copepods. During the spring bloom ciliates and copepods showed a strong dietary overlap characterized by a wide food spectrum consisting mainly of Chrysochromulina sp., diatom chains and large, single-celled diatoms.
本研究旨在模拟不同程度的冬季变暖，并评估其对纤毛虫演替和与摄食相关模式的潜在影响。通过使用装有基尔湾未过滤海水的室内中型生态系统、自然光照和四种不同温度条件，诱导浮游植物春季水华，并对纤毛虫的热响应进行量化。可以检测到两种不同的纤毛虫组合，即春季前和春季水华组合，而它们的形成强烈依赖于温度。两种组合均以陀螺藻属为主；春季前水华阶段以小型陀螺藻卵形洛曼藻为主，春季水华主要以陀螺藻属的大型陀螺藻为主。纤毛虫对食物浓度增加的数值响应显示出温度的强烈加速作用。在春季前水华期，纤毛虫和桡足类的摄食率较低，在水华期较高，纤毛虫的摄食率范围为0.06（温度变化0℃）至0.23天⁻¹（温度变化4℃），桡足类的摄食率范围为0.09（温度变化0℃）至1.62天⁻¹（温度变化4℃）。在春季水华期间，纤毛虫和桡足类表现出强烈的食物重叠，其特征是食物谱广泛，主要由金藻、硅藻链和大型单细胞硅藻组成。
