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Environmental characterization of an Amazonian lake for Isoëtes cangae translocation

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Abstract

The Amazon endemic quillwort Isoëtes cangae is a critically endangered submerged plant found exclusively at the Lake Amendoim, at iron rock fields in Serra dos Carajás, Eastern Brazilian Amazon. Lake Amendoim is an oligotrophic lake with high iron content and rocky to organic-clay sediment. Another aquatic ecosystem in the vicinity, Lake Três Irmãs-3, was evaluated for its limnological characteristics and the ecophysiological markers to assess whether this ecosystem is suitable for the translocation and conservation of I. cangae. Over the course of 2 years, underwater light spectra and water physicochemical characteristics were determined at both sites during dry and rainy periods. In addition, the chlorophyll a fluorescence of I. cangae was measured using Pulse-Amplitude Modulated fluorometry. Our findings reveal that the limnological dynamics of both lakes are very similar, and differences in limnological conditions between time periods were restricted to a few variables associated with climatic regime shifts (such as temperature, turbidity and total solids). We also identified that I. cangae can maintain its photosynthetic performance and reproduced in the Lake Três Irmãs-3. Our findings suggest that Lake Três Irmãs-3 is a suitable candidate ecosystem for I. cangae conservation due to the high limnological similarity between the studied lakes and the ecophysiological results.

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Abbreviations

LA:

Lake Amendoim

LTI-3:

Lake Três Irmãs-3

PAM:

Pulse amplitude modulation

IUCN:

International union for conservation of nature

ORP:

Oxi-reduction potential

NTU:

Nephelometric turbidity unit

DO:

Dissolved oxygen concentration

PAR:

Photosynthetically active radiation

Fm:

Maximal fluorescence

Fv:

Variable fluorescence

ΔF/Fm’ :

Effective quantum yield of photosystem II

Fv/Fm’:

Potential quantum yield of photosystem II

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Funding

This work was supported by Fundacao Coppetec (Grant No. 20734). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by LASP, AdaRG, DBZ, ENC, JdaRG, and JGFG. The first draft of the manuscript was written by AdaRG, LASP, MPS, and DBZ, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Daniel B. Zandonadi.

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The authors declare that they have no conflict of interest.

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Communicated by Thomas Abeli

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Supplementary file1 (DOCX 1080 KB)

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Prado, L.A.S., da R. Gripp, A., Cogo, A.J.D. et al. Environmental characterization of an Amazonian lake for Isoëtes cangae translocation. Plant Ecol 224, 831–840 (2023). https://doi.org/10.1007/s11258-023-01300-w

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  • DOI: https://doi.org/10.1007/s11258-023-01300-w

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