Aquatic quillworts, iIsoetes echinospora/i and iI. lacustris/i under acidic stress-A review from a temperate refuge

0583945 - BC 2024 RIV US eng J - Článek v odborném periodiku
Čtvrtlíková, Martina - Kopáček, Jiří - Nedoma, Jiří - Znachor, Petr - Hekera, P. - Vrba, Jaroslav
Aquatic quillworts, iIsoetes echinospora/i and iI. lacustris/i under acidic stress-A review from a temperate refuge.
Ecology and Evolution. Roč. 13, č. 3 (2023), č. článku e9878. ISSN 2045-7758. E-ISSN 2045-7758
Grant CEP: GA ČR GA22-05421S
Institucionální podpora: RVO:60077344
Klíčová slova: aluminum toxicity * submerged macrophytes * mountain lakes * softwater lakes
Obor OECD: Plant sciences, botany
Impakt faktor: 2.6, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1002/ece3.9878

Quillworts (Isoetes) 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 Isoetes 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 Plesne Lake has been observed, while no such renewal of I. lacustris, dwelling in Cerne 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 mu g L-1 Al at pH 5) and I. lacustris (pH <= 5.0 and >= 100 mu g 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.
Trvalý link: https://hdl.handle.net/11104/0351925