ABSTRACT: The peritrich ciliate Epistylis sp. is commonly found attached to the dominant calanoid copepod Pseudodiaptomus stuhlmanni in the St Lucia Estuary, South Africa. A study was conducted to test if salinity interacted with temperature and turbidity to affect the survivorship of Epistylis sp. Two-way analysis of variance on ranks was conducted to test for the main and interaction effects of these parameters. There was no interaction between temperature and salinity, and temperature (15, 21 and 30°C) did not affect Epistylis sp. The survivorship of Epistylis sp. was however significantly and negatively affected by high salinity. Post hoc analyses revealed that the highest salinity level (25) was responsible for most of the Epistylis sp. mortalities. The survivorship of Epistylis sp. was significantly affected by the interaction between turbidity and salinity. High turbidity (1000 nephelometric turbidity units [NTU]) negatively affected survivorship across the entire salinity gradient (0 to 25), and high salinity (25) also generally resulted in low survivorship across the turbidity gradient of 50 to 1000 NTU. As the host P. stuhlmanni is more tolerant of high salinity and high turbidity, these findings suggest that these conditions can modulate epibiosis by limiting the prevalence and cover of Epistylis sp. in the St Lucia Estuary, particularly when salinity is high.

中文翻译：

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盐度，温度和浑浊度对表生性peritrich Peristrich Epistylis sp。的存活率的影响。

摘要：蠕虫的纤毛Epistylis sp。常见于南非圣卢西亚河口的优势cal足类an足类Pseudodiaptomus stuhlmanni。进行了一项研究，以测试盐度是否与温度和浊度相互作用，从而影响Epistylis sp。的存活。进行了等级方差的双向分析，以测试这些参数的主要作用和交互作用。温度和盐度之间没有相互作用，温度（15、21和30°C）不影响Epistylis sp。Epistylis的幸存者sp。然而，盐度高对土壤有显着的负面影响。事后分析显示，最高盐度水平（25）导致大多数Epistilis sp.。死亡率。Epistylis sp。的生存。浊度和盐度之间的相互作用显着影响。高浊度（1000浊度浊度单位[NTU]）对整个盐度梯度（0到25）的存活率产生负面影响，而高盐度（25）也通常导致50到1000 NTU浊度梯度的低存活率。作为东道主P。施图尔曼尼由于对高盐度和高浊度的耐受性更高，这些发现表明这些条件可以通过限制Epistylis sp。的流行和覆盖来调节流行病。在圣卢西亚河口，特别是当盐度高时。