Climate features or the composition of submerged vegetation? Which factor has a greater impact on the phytoplankton structure in temperate lakes?

Pełechata, Aleksandra; Kufel, Lech; Pukacz, Andrzej; Strzałek, Małgorzata; Biardzka, Elżbieta; Brzozowski, Michał; Kaczmarek, Lech; Pełechaty, Mariusz

doi:10.1016/j.ecolind.2022.109840

Cited by 7 publications

(2 citation statements)

References 53 publications

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“…Considering climate change and the consequence of bloom-forming cyanobacteria domination in the phytoplankton community structure, only submerged vegetation with lower requirements for critical environmental factors can better withstand climate- and cyanobacteria-caused disturbances in the ecosystem. Surprisingly, charophytes seem to be good candidates as they can diminish the share of cyanobacteria in the lake phytoplankton more effectively than submerged vascular macrophytes and exhibit the potential to mitigate the effects of climate change ( Pełechata et al., 2023 ). Therefore, future global warming effects should be considered in planning, management, and restoration since strategies may need to be refined and adapted to preserve or improve the present-day lake water quality ( Trolle et al., 2011 ).…”

Section: Discussionmentioning

confidence: 99%

Submerged macrophyte self-recovery potential behind restoration treatments: sources of failure

Rybak,

Rosińska,

Wejnerowski

et al. 2024

Front. Plant Sci.

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When exploring the challenges of restoring degraded lakes, we often do not observe the expected results despite executing all planned activities. Our study elucidates the reasons that impede the recovery of submerged macrophytes despite ameliorated light conditions. When prolonged lake degradation occurs, subsequent efforts to increase light availability often prove insufficient, resulting in a persistent turbid water state. In this study, we attempted to determine the reasons for these failures through a germination test and propagule bank analysis conducted in bottom sediments from a severely degraded lake, which underwent restoration. Although the bottom sediments indicate relative potential in the number of oospores and seeds, their germination efficacy remained dismally low. Based on the germination test results and factors affecting the development of submerged macrophytes (physical and chemical parameters, lake morphology), we stated that improvement of light conditions in the lake could be insufficient to recover the vegetation, especially when the potential to renew diverse plant communities from sediments naturally is low. Our findings advocate for a paradigmatic shift in lake restoration strategies. A holistic approach that includes propagule bank assessments before embarking on restoration initiatives and enabling the identification of macrophyte resurgence potentials is recommended. We also advocate for a multifaceted restoration framework, emphasizing the indispensability of augmenting natural recovery mechanisms with targeted interventions. Consequently, in some cases, macrophyte reintroduction could be the only solution. By reintroducing autochthonic species to site-specific ecological dynamics, we anticipate an increased success rate in restituting submerged vegetation, thus catalyzing ecological regeneration within degraded lake ecosystems.

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Section: Discussionmentioning

confidence: 99%

Submerged macrophyte self-recovery potential behind restoration treatments: sources of failure

Rybak,

Rosińska,

Wejnerowski

et al. 2024

Front. Plant Sci.

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“…We selected six lakes dominated by common charophyte species based on our earlier surveys. Three lakes were situated in the Lubuskie Lakeland (W Poland) and three in the Masurian Lakeland (NE Poland), two regions with different climatic conditions (Table 1; for further differences see Pełechata et al 2023). Sites within a lake (one to three per lake—Table 2) were not <50 m away from each other, and charophytes grew at a depth of 1.5–3 m. Lake water and plant samples were collected once per season: in summer (the middle of July), autumn (the middle of November) and spring (2–3 weeks after ice‐out, usually at the end of March or at the beginning of April) between summer 2017 and spring 2020.…”

Section: Methodsmentioning

confidence: 99%

Recycling and deposition of inorganic carbon from calcium carbonate encrustations of charophytes

Strzałek,

Kufel,

Apolinarska

et al. 2023

Limnology & Oceanography

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Many aquatic primary producers can use bicarbonates as a carbon source for photosynthesis. Charophytes of the two genera: Chara and Nitellopsis are quite efficient in this process. Some species of these macroalgae produce carbonate encrustations, mainly calcium carbonate, constituting up to 86% of the summer maximum dry weight of the standing crop. In this study, we analyzed the fate of inorganic carbon accumulated this way in Chara spp. and Nitellopsis obtusa from six Polish lakes located in two regions (warmer W Poland and cooler NE Poland). Our study distinguished two groups of charophyte species that differed in the way of CaCO3 release from their summer standing crops. On average, the corticate Chara rudis and C. tomentosa belonging to the first group were less efficient in depositing CaCO3 from summer to autumn than the less corticate C. contraria and ecorticate N. obtusa of the second group. The latter two species were more efficient in inorganic carbon burial in sediments. On the contrary, dissolution of encrustation was more typical of the first species group and was facilitated by decreasing the pH and saturation index of calcite in lake water. The final output of CaCO3 loss mainly resulted from combined species‐specific features, lake water properties and overwintering patterns. Our study revealed that inorganic carbon cycling through charophytes involves burial and dissolution and is more complex than previously thought.

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Do stable carbon and nitrogen isotope values of Nitella flexilis differ between softwater and hardwater lakes?

et al. 2023

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The composition of stable carbon and nitrogen isotopes (δ13C and δ15N) is widely used for tracking the origin of organic matter (OM) present in lacustrine sediments. These isotopes also define the evolution of OM in food web loops. Charophyte species Nitella flexilis C. Agardh, 1824 can be found in different aquatic environments where it contributes significantly to sediment formation and influences biota function. Therefore, it is crucial to study more about δ13C and δ15N in different lake types. Here, we present the results of the first comprehensive study of N. flexilis δ13C and δ15N, which add to the knowledge of the C and N isotope records of charophytes. We obtained the δ13C and δ15N records of N. flexilis OM from hardwater and softwater lakes and checked for differences between these records. We also analyzed the differences in physical and chemical parameters. Finally, we compared the δ13C and δ15N records with physical and chemical parameters to identify the variables that have the highest influence on N. flexilis δ13C and δ15N values. Our study showed that both δ13C and δ15N did not differ significantly in the two types of lakes, although the lakes had significant differences in several physical and chemical parameters (pH, Ca2+, dissolved inorganic carbon, total phosphorus, conductivity). However, we observed that δ13C values were influenced by light conditions (photosynthetic active radiation, depth, dissolved OM), while δ15N values were influenced by the total nitrogen concentration in water.

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Climate features or the composition of submerged vegetation? Which factor has a greater impact on the phytoplankton structure in temperate lakes?

Cited by 7 publications

References 53 publications

Submerged macrophyte self-recovery potential behind restoration treatments: sources of failure

Submerged macrophyte self-recovery potential behind restoration treatments: sources of failure

Recycling and deposition of inorganic carbon from calcium carbonate encrustations of charophytes

Do stable carbon and nitrogen isotope values of Nitella flexilis differ between softwater and hardwater lakes?

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