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Egeria najas Planchon (Hydrocharitaceae) responses to abiotic short-term environmental changes

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Abstract

Understanding the factors that control the growth of macrophytes is of paramount importance in predicting their distribution and management. This study describes the effect of short-term variation of pH, light intensity (10–390 µmol m−2 s−1), and temperature (15–30 °C) over the gross photosynthetic rate, respiration rate and net photosynthetic rate (NP) of Egeria najas in nutrient limited condition, and high nutrient availability. The light and dark bottles method was utilized to measure photosynthesis. The pH increase from 4.0 to 8.5 promoted a continuous decrease in NP. Temperature had an important effect on the NP value, with variations in Q10 from 1.42 to 2.23. Although maximum NP rates occurred under low light intensity (158–204 µmol m−2 s−1), in short-term, the availability of light can represent the main factor controlling photosynthesis in rooted E. najas; nevertheless, dissolved nutrients can highly induce the growth of free-float specimens. Our results facilitate the understanding of E. najas potential to colonize since it easily adapts to changes in environmental conditions.

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Data availability

The data that support the findings of this study are available from the corresponding author (IBJ.) upon request.

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Acknowledgements

The authors thank Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the scholarships (CNPq proc. No. 140406/2003-4; 150169/2004-3; 306564/2020-0) and financing (CT-Hidro/CNPq, proc. No. 550188/2002-9; Edital MCT/CNPq 02/2006—Universal; proc. No. 470527/2006-4).

Funding

This study was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq proc. No. 140406/2003-4; 150169/2004-3; 306564/2020-0; 306564/2020-0; CT-Hidro/CNPq, proc. No. 550188/2002-9; Edital MCT/CNPq 02/2006—Universal; proc. No. 470527/2006-4).

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Contributions

IBJ and MBCS developed the math procedures. MMP, AFMC and MBCS participated in the design of the study, field surveys, experimental works, and data analyses, and wrote the manuscript. AFMC, MBCS and IBJ participated in the design of the study, edited the manuscript, and secured the funding. All authors read and approved the final manuscript. This paper has not been submitted elsewhere in an identical or similar form after its submission to Hydrobiologia. The four authors agree with the entire content (data and interpretation) of this manuscript and declare that the data are available under request.

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Correspondence to Irineu Bianchini Jr..

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Pezzato, M.M., da Cunha-Santino, M.B., Camargo, A.F.M. et al. Egeria najas Planchon (Hydrocharitaceae) responses to abiotic short-term environmental changes. Hydrobiologia (2024). https://doi.org/10.1007/s10750-024-05496-4

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  • DOI: https://doi.org/10.1007/s10750-024-05496-4

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