Dietary-induced responses in the phagotrophic flagellate Oxyrrhis marina

作者:Florian Matthias Hantzsche and Maarten Boersma 刊名:Marine Biology 上传者:魏建波

全文阅读

ORIGINAL PAPER Dietary-induced responses in the phagotrophic flagellate Oxyrrhis marina Florian Matthias Hantzsche • Maarten Boersma Received: 5 August 2009/Accepted: 26 March 2010/Published online: 13 April 2010 Springer-Verlag 2010 Abstract Primary producers may be limited by different nutrients as well as by light availability, which in turn affects their quality as food for higher trophic levels. Typically, algae with high C:N and/or C:P ratios are low-quality food for consumers. Heterotrophic protists are important grazers on these autotrophes, but despite their importance as grazers, knowledge of food quality effects on heterotrophic protists is sparse. In the present study, we examined how differently grown Rhodomonas salina (nutrient replete, N-limited and P-limited) affected the phagotrophic flagellate Oxyrrhis marina. The functional response of O. marina (based on ingested biovolume) did not show significant differences between food sources, thus food uptake was independent of food quality. O. marina was weakly homoeostatic which means that its C:N:P ratio still reflected the elemental composition of its food to some extent. Food quality had a significantly negative effect on the numerical response of O. marina. Whereas N-limited R. salina and nutrient replete R. salina resulted in similar growth rates, P-limited algae had a significantly negative effect on the specific growth rate of O. marina. Hence, the lack of elemental phosphorus of O. marina feeding on P-limited alga

参考文献

引证文献

问答

我要提问