Growth of Platymonas helgolandica var.tsingtaoensis,Cylindrotheca closterium and Karenia mikimotoi and their survival strategies under different N/P ratios

Abstract

Abstract: In this study,laboratory culture experiments were carried out in a batch culture system,with the focus on the effect of different N/P ratios (1:1,4:1,16:1,80:1 and 160:1) on the growth of Platymonas helgolandica var.tsingtaoensis,Cylindrotheca closterium and Karenia mikimotoi.The cell abundance,growth rate,and chlorophyll a and protein contents were measured every 24 h for one week.The results showed that N/P ratio significantly affected the growth of three kinds of algae.Cylindrotheca closterium grew fastest under 160:1 N/P ratio,while Platymonas helgolandica var.tsingtaoensis and Karenia mikimotoi grew fastest under 4:1 and 80:1 N/P ratio,respectively.The maximum cell density of the phytoplankton was mainly influenced by cell size and specific growth rate,the synthesis of chlorophyll a was mainly affected by nitrogen,and high N/P ratio benefited the increase of chlorophyll a content.The protein concentration in cells correlated significantly with N/P ratio,cell size and cell period.As for survival strategy,Cylindrotheca closterium showed obvious features of fast-reproductioned r-selective species,whereas Platymonas helgolandica var.tsingtaoensis and Karenia mikimotoi were most likely to be the more competitive K-selected species.

Key words: N/P ratio, Phytoplankton, Chlorophyll a, Protein, Specific growth rate

CLC Number:

Q949.2

SUN Jun, LIU Dongyan, CHEN Zongtao, WEI Tiandi . Growth of Platymonas helgolandica var.tsingtaoensis,Cylindrotheca closterium and Karenia mikimotoi and their survival strategies under different N/P ratios[J]. Chinese Journal of Applied Ecology, 2004, (11): 2122-2126.

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