

FOLLOWUS
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
Online First:20 March 2010,
Published:2010
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Li, L., Zhang, P., Zhao, J. et al. Effect of UV-B irradiation on interspecific competition between Ulva pertusa and Grateloupia filicina, ., Chin. J. Ocean. Limnol. 28, 288–294 (2010). https://doi.org/10.1007/s00343-010-9255-3
We report the effect of UV-B irradiation (9.6 kJ m−2 day−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.
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