Effect of UV-B irradiation on interspecific competition between Ulva pertusa and Grateloupia filicina  

作　　者：李丽霞 张培玉 赵吉强 周文礼 唐学玺 

机构地区：[1]College of Marine Life Science,Ocean University of China [2]Chemistry and Biology College,Yantai University [3]Department of Environmental Science and Engineering,Qingdao University

出　　处：《Chinese Journal of Oceanology and Limnology》2010年第2期288-294,共7页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.30270258);the Natural Science Foundation of Shandong Province(No.2007ZRB01903)

摘　　要：We report the effect of UVoB irradiation （9.6 kJ m-2 day^-） on interspecific competition between two species of macroalgae, Ulva pertusa （U） and Grateloupiafilicina （G）, in co-culture. Growth of U. pertusa and G. filicina was inhibited by UV-B irradiation in mono-culture and specific growth rate （μ） declined as a result. Interspecific competition between U. pertusa and G filicina was closely related to the initial weights when co-cultured. When initial ratios of U. pertusa （U） to G filicina （G） were U：G=I.2：I and 1：1, U. pertusa was the dominant algae. When the initial U：G ratio was 1：1.2, G. filicina was competitively dominant in the earlier stage, but U. pertusa grew faster, superseding G. filicina in the later stage. At initial ration U：G = 1：1.4, G. filicina was predominant. Under UV-B irradiation, the competitive ability of G filicina was weakened and the interspecific competitive balance favored U. pertusa, which suggests that G. filicina was more sensitive to UV-B irradiation. We also probed the potential allelopathic effects between the two species, which led to mutual growth inhibition.We report the effect of UV-B irradiation(9.6 kJ m-2day-1)on interspecific competition between two species of macroalgae,Ulva pertusa(U)and Grateloupia filicina(G),in co-culture.Growth of U.pertusa and G.filicina was inhibited by UV-B irradiation in mono-culture and specific growth rate (μ)declined as a result.Interspecific competition between U.pertusa and G.filicina was closely related to the initial weights when co-cultured.When initial ratios of U.pertusa(U)to G.filicina(G)were U:G=1.2:1 and 1:1,U.pertusa was the dominant algae.When the initial U:G ratio was 1:1.2,G.filicina was competitively dominant in the earlier stage,but U.pertusa grew faster,superseding G.filicina in the later stage.At initial ration U:G=1:1.4,G.filicina was predominant.Under UV-B irradiation,the competitive ability of G.filicina was weakened and the interspecific competitive balance favored U.pertusa,which suggests that G.filicina was more sensitive to UV-B irradiation.We also probed the potential allelopathic effects between the two species,which led to mutual growth inhibition.

关 键 词：Ulva pertusa Grateloupia filicina UV-B irradiation interspecific competition initial weight allelopathic effect 

分 类 号：S917.4[农业科学—水产科学]