Effect of CO_2 enrichment on competition between Skeletonema costatum and Heterosigma akashiwo  

作　　者：徐达 周斌 王悠 鞠青 于庆云 唐学玺 

机构地区：[1]Laboratory of Ecology,College of Marine Life Science,Ocean University of China

出　　处：《Chinese Journal of Oceanology and Limnology》2010年第4期933-939,共7页中国海洋湖沼学报（英文版）

基　　金：Supported by the Specialized Research Program for Marine Public Welfare Industry,SOA(No.200805066)

摘　　要：We investigated the effect of CO2 enrichment and initial inoculum density on competition between Skeletonema costatum and Heterosigma akashiwo,two common algae seen in algal blooms.The initial inoculum density(0.2×104,0.4×104,0.8×104 cells/ml) had a significant effect on population growth and competition between H.akashiwo and S.costatum.The time required for population growth to reach the exponential growth phase and stationary phase decreased significantly as the initial density increased.When the two species were cultured together,S.costatum tended to outcompete H.akashiwo,especially when present at higher initial ratios.CO_2 enrichment(5 000μl/L CO_2) increased the maximum population density and carrying capacity of H.akashiwo but decreased these measures for S.costatum.Thus,CO_2 enrichment favored the growth of H.akashiwo over S.costatum.We investigated the effect of CO2 enrichment and initial inoculum density on competition between Skeletonema costatum and Heterosigma akashiwo,two common algae seen in algal blooms.The initial inoculum density（0.2×10^4,0.4×10^4,0.8×10^4 cells/ml） had a significant effect on population growth and competition between H.akashiwo and S.costatum.The time required for population growth to reach the exponential growth phase and stationary phase decreased significantly as the initial density increased.When the two species were cultured together,S.costatum tended to outcompete H.akashiwo,especially when present at higher initial ratios.CO2 enrichment（5 000μl/L CO2） increased the maximum population density and carrying capacity of H.akashiwo but decreased these measures for S.costatum.Thus,CO2 enrichment favored the growth of H.akashiwo over S.costatum.

关 键 词：marine microalgae population competition CO2 enrichment red tide microalgae Skeletonema costatum Heterosigma akashiwo 

分 类 号：Q945[生物学—植物学]