Influences of a submerged macrophyte on colony formation and growth of a green alga

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Abstract

The effects of the submerged macrophyte Ceratophyllum demersum on the growth and morphology of the green alga Scenedesmus obliquus were assessed by conducting co-culture laboratory experiments (15 and 25°C, presence/absence of 3 g fresh wt of C. demersum per litre of water in S. obliquus culture). Growth rate, photosynthetic pigment-based growth, photo-synthetic activity and colony formation of S. obliquus increased in the presence of C. demersum. The proportion of 4-celled colonies of S. obliquus increased from 36 to 76% at 25°C, and from 51 to 71% at 15°C in the presence of C. demersum. The induced morphological shift from unicells to colonies in S. obliquus promoted sedimentation to the bottom-water region, thereby providing a competitive advantage for the submerged macrophyte.

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Dong, J., Lu, J. J., Li, G. B., & Song, L. R. (2013). Influences of a submerged macrophyte on colony formation and growth of a green alga. Aquatic Biology, 19(3), 265–274. https://doi.org/10.3354/ab00533

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