Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge
Abstract Quillworts (Isoëtes) represent highly specialized flora of softwater lakes, that is, freshwater ecosystems potentially sensitive to acidification. In this paper, we combine a review of previous studies and our new results to address unrecognized reproduction strategies of quillworts to over...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-03-01
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| Series: | Ecology and Evolution |
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| Online Access: | https://doi.org/10.1002/ece3.9878 |
| _version_ | 1797857503712641024 |
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| author | Martina Čtvrtlíková Jiří Kopáček Jiří Nedoma Petr Znachor Petr Hekera Jaroslav Vrba |
| author_facet | Martina Čtvrtlíková Jiří Kopáček Jiří Nedoma Petr Znachor Petr Hekera Jaroslav Vrba |
| author_sort | Martina Čtvrtlíková |
| collection | DOAJ |
| description | Abstract Quillworts (Isoëtes) represent highly specialized flora of softwater lakes, that is, freshwater ecosystems potentially sensitive to acidification. In this paper, we combine a review of previous studies and our new results to address unrecognized reproduction strategies of quillworts to overcome long‐term environmental stresses. These strategies play an important role in the plant's ability to overcome atmospheric acidification of freshwaters, protecting the plants until their environment can recover. Environmental drivers of recovery of Isoëtes echinospora and I. lacustris were studied in two acidified lakes in the Bohemian Forest (Central Europe). Both populations survived more than 50 years of severe acidification, although they failed to recruit new sporelings. Their survival depended entirely on the resistance of long‐living adult plants because the quillworts do not grow clonally. During the past two decades, a renewal of I. echinospora population inhabiting Plešné Lake has been observed, while no such renewal of I. lacustris, dwelling in Černé Lake, was evident, despite similar changes in water composition occurring in both lakes undergoing advanced recovery from acidification. Our in vitro experiments revealed that the threshold acidity and toxic aluminium concentrations for sporeling survival and recruitment success differed between I. echinospora (pH ≤ 4.0 and ≥300 μg L−1 Al at pH 5) and I. lacustris (pH ≤ 5.0 and ≥100 μg L−1Al at pH 5). The higher sensitivity of I. lacustris to both stressors likely stems from its year‐long germination period and underlines the risk of exposure to chronic or episodic acidification in recovering lakes. By contrast, the shorter germination period of I. echinospora (2–3 months) enables its faster and deeper rooting, protecting this quillwort from periodic acidification during the next snowmelt. Our study brings novel insights into widely discussed environmental issues related to the long‐term degradation of softwater lakes, which represent important hotspots of pan‐European biodiversity and conservation efforts. |
| first_indexed | 2024-04-09T20:57:41Z |
| format | Article |
| id | doaj.art-ab3010395d8b4c6f9809380fb739de39 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-04-09T20:57:41Z |
| publishDate | 2023-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-ab3010395d8b4c6f9809380fb739de392023-03-29T14:14:47ZengWileyEcology and Evolution2045-77582023-03-01133n/an/a10.1002/ece3.9878Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refugeMartina Čtvrtlíková0Jiří Kopáček1Jiří Nedoma2Petr Znachor3Petr Hekera4Jaroslav Vrba5Biology Centre CAS, Institute of Hydrobiology České Budějovice Czech RepublicBiology Centre CAS, Institute of Hydrobiology České Budějovice Czech RepublicBiology Centre CAS, Institute of Hydrobiology České Budějovice Czech RepublicBiology Centre CAS, Institute of Hydrobiology České Budějovice Czech RepublicFaculty of Science Palacký University Olomouc Olomouc Czech RepublicBiology Centre CAS, Institute of Hydrobiology České Budějovice Czech RepublicAbstract Quillworts (Isoëtes) represent highly specialized flora of softwater lakes, that is, freshwater ecosystems potentially sensitive to acidification. In this paper, we combine a review of previous studies and our new results to address unrecognized reproduction strategies of quillworts to overcome long‐term environmental stresses. These strategies play an important role in the plant's ability to overcome atmospheric acidification of freshwaters, protecting the plants until their environment can recover. Environmental drivers of recovery of Isoëtes echinospora and I. lacustris were studied in two acidified lakes in the Bohemian Forest (Central Europe). Both populations survived more than 50 years of severe acidification, although they failed to recruit new sporelings. Their survival depended entirely on the resistance of long‐living adult plants because the quillworts do not grow clonally. During the past two decades, a renewal of I. echinospora population inhabiting Plešné Lake has been observed, while no such renewal of I. lacustris, dwelling in Černé Lake, was evident, despite similar changes in water composition occurring in both lakes undergoing advanced recovery from acidification. Our in vitro experiments revealed that the threshold acidity and toxic aluminium concentrations for sporeling survival and recruitment success differed between I. echinospora (pH ≤ 4.0 and ≥300 μg L−1 Al at pH 5) and I. lacustris (pH ≤ 5.0 and ≥100 μg L−1Al at pH 5). The higher sensitivity of I. lacustris to both stressors likely stems from its year‐long germination period and underlines the risk of exposure to chronic or episodic acidification in recovering lakes. By contrast, the shorter germination period of I. echinospora (2–3 months) enables its faster and deeper rooting, protecting this quillwort from periodic acidification during the next snowmelt. Our study brings novel insights into widely discussed environmental issues related to the long‐term degradation of softwater lakes, which represent important hotspots of pan‐European biodiversity and conservation efforts.https://doi.org/10.1002/ece3.9878acidificationisoetidsreproductionsoftwater lakestoxicity |
| spellingShingle | Martina Čtvrtlíková Jiří Kopáček Jiří Nedoma Petr Znachor Petr Hekera Jaroslav Vrba Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge Ecology and Evolution acidification isoetids reproduction softwater lakes toxicity |
| title | Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge |
| title_full | Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge |
| title_fullStr | Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge |
| title_full_unstemmed | Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge |
| title_short | Aquatic quillworts, Isoëtes echinospora and I. lacustris under acidic stress—A review from a temperate refuge |
| title_sort | aquatic quillworts isoetes echinospora and i lacustris under acidic stress a review from a temperate refuge |
| topic | acidification isoetids reproduction softwater lakes toxicity |
| url | https://doi.org/10.1002/ece3.9878 |
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