Abstract
Climate warming, a serious environmental problem worldwide, is considered a major threat to aquatic ecosystems. A primary feature of climate warming is elevated temperatures which in shallow aquatic ecosystems might affect competition for light and nutrient between benthic algae on the sediment surface and planktonic algae in the water. The outcomes of such competition would not only affect the distribution of primary production, but also determine the fundamental character of shallow aquatic habitats as clear water or turbid water systems. We conducted a mesocosm study to evaluate the effects of elevated temperature on competition between planktonic algae and benthic algae for light and nutrients. We found that elevated temperature increased the concentrations of total nitrogen (TN), total phosphorus (TP), and total suspended solids (TSS) in overlying water and enhanced the growth of planktonic algae (measured as chlorophyll a, Chl a), but decreased light intensity and benthic algal biomass (Chl a). Our results indicate that elevated temperature can increase the growth of planktonic algae and enhance their competitive advantage over the benthic algae in shallow lakes, thereby contributing to eutrophication and a decline in water quality. These findings shed further light on the effects of global warming on aquatic ecosystems.
Introduction
Climate warming has become a serious environmental problem worldwide and is considered a major threat to the natural environment, including aquatic ecosystems (; ). A major feature of climate warming is elevated temperatures (). According to the Sixth Scientific Assessment Report (), global average temperatures increased 1.5°C from 1880 to 2018, and this trend continues. The currents warming rate is projected to be 0.25°C per decade until the middle of the 21st century and 0.36°C per decade in the second half of the century (). Warming will have profound impacts on ecological processes in aquatic ecosystems () by affecting primary production, water resource distribution and water quality ().
Elevated temperatures can promote the growth of algae in both benthic and planktonic habitats and affect the physiology of primary producers (; ; ) because temperature plays a crucial role in metabolic processes, including photosynthesis, nutrient uptake and the enzymatic activity of cells (; Thorel et al., 2014). However, temperature also influences the chemical and physical processes of aquatic ecosystems (Takano and Hino, 2000; ; ) with implication for the dynamics of the aquatic ecosystems. Increased temperature promotes the release of nitrogen and phosphorus from sediments (), which may enhance planktonic algal growth and thus an increase in TSS. Increases of planktonic algae and total suspended solids (TSS) reduce the light intensity on the sediment surface (; Zhang et al., 2015; ), limiting the growth of benthic algae (Takano and Hino, 2000; ). Thus, elevated temperature might affect the growth of both planktonic and benthic algae in aquatic systems.
In shallow lakes, benthic algae growing on sediment surfaces are often limited by light resources as a result of attenuation caused by planktonic algae in the overlying water (Vadeboncoeur et al., 2003). In systems where external nutrient loading has been reduced, internal loading becomes a limiting factor for the planktonic algae (Zhu et al., 2010), while benthic algae benefit from nutrients in the sediment. If abundant, benthic algae may reduce sediment release of nutrients and thereby further hampering growth of planktonic algae (Vadeboncoeur et al., 2003; Zhang et al., 2013; ). Competition between planktonic algae and benthic algae is one of the key factors affecting shallow aquatic ecosystem dynamics (; ) and has become an area of great interest in freshwater ecology (; Zhang et al., 2013; ).
However, the effects of elevated temperature on resource competition between benthic and planktonic algae in shallow aquatic ecosystems are yet to be fully understood. Here, we hypothesized that elevated temperature would benefit planktonic algae and hamper benthic algae, leading to a deterioration in water quality. To test this hypothesis, we designed a mesocosm experiment with elevated temperatures and compared with controls run at ambient temperature. The effects of elevated temperature on the competition between planktonic algae and benthic algae for resources of light and nutrient were investigated using measurements of light intensity on the sediment surface, nutrient content in overlying water, and the development of benthic and planktonic algal biomass over time. The aim of this study is to evaluate the effect of elevated temperature on resource competition between benthic and planktonic algae in shallow aquatic ecosystems. The results may shed light on the effects of global warming on natural aquatic ecosystems.
Materials and Methods
Experimental Setup
The mesocosm system consisted of eight white polyethylene plastic tanks (bottom diameter = 46 cm, upper diameter = 57 cm, and height = 72 cm) placed in the agricultural garden of Anhui Agricultural University, Hefei, China. Sediments were collected from a pond at the campus and were air dried and crushed to remove large particles. The treated sediment was then added to the tanks in order to obtain a 10 cm thick layer (Zhang et al., 2016).
Rainwater (TN = 0.96 mg/L−1, TP = 0.02 mg/L−1) was collected and added to each tank to a depth of 70 cm. All eight mesocosms were allowed to equilibrate for 2 weeks before the experiment started. Then four treatments were covered by black plastic paper on the outside wall to create elevated temperature while the controls were covered by heat insulation film. Both the black paper and the heat insulation film are lightproof. So, sunlight did not enter through the sidewall of either the treatment or the control mesocosms. A Petri dish (diameter of 6 cm) containing treated sediments was inserted into the upper sediment layer of each mesocosm, such that the surface the sediments inside and outside the dishes was at the same level for benthic algae growth. Rainwater was added to the mesocosms as required to maintain the water levels during the experiment. The experiment was then run for 60 days from July 23 to 20 September 2020.
Sampling
The tanks were sampled at approximately 12 noon every 10 days during the experimental period. Water samples (500 ml) were taken with a clean glass bottle from 10 cm below the water surface from each mesocosm, and analyzed for total nitrogen (TN), total phosphorus (TP), total suspended solids (TSS) and planktonic algal biomass (Chl a). TN was determined by alkaline potassium persulfate UV spectrophotometry and TP was determined by ammonium molybdate UV spectrophotometry (). 200 ml water was filtered by GF/C grade filter for Chl a of planktonic algal biomass and the Chl a on the filter was determined by UV spectrophotometry after extraction in 90% acetone (). TSS was calculated by weighing the residue retained on a GF/C grade filter after filtering 200 ml water and drying at 108°C for 2 h ().
Water temperature was measured using a YSI probe from 30 cm below the water surface. Light intensity was measured using an underwater irradiance meter (ZDS-10W) at 50 cm below the water surface before sampling the water.
The Petri dishes with their benthic algae were removed slowly from each mesocosm and the benthic algae were scraped off and diluted with distilled water to 500 ml, then stored in brown glass bottles prior to analysis of algal biomass (Chl a) using the same method as for planktonic algae. After sampling, the Petri dishes and the sediments were re-loaded into each mesocosm for further benthic algae growth.
Statistical Analyses
Independent sample t-tests were used to analyze differences in water temperature, TSS, light intensity, TN, TP and Chl a of both planktonic and benthic algal biomass between the elevated temperature treatment mesocosms and the controls. One-way ANOVA was performed to detect differences between treatments on each sampling occasion. SPSS 19.0 was used for data statistics analysis. All data are presented as mean ± SD and figures were generated by Origin Pro 9.0.
Results
Water Temperature
On average, water temperature was 1.7°C higher in the elevated temperature treatments than in the controls (t-test, p = 0.037), at 30.7 ± 0.3°C compared to 29.0 ± 0.2°C (Table 1). A significant difference in temperature was apparent on every sampling occasion except for day 10 and day 60 (one-way ANOVA, treatment effect, p < 0.05).
TABLE 1
| Time (d) | Control | Elevated Temperature | Increased | p |
|---|---|---|---|---|
| 0 | 29.3 ± 0.0 | 29.3 ± 0.0 | — | — |
| 10 | 33.8 ± 0.2 | 35.8 ± 0.1 | 2.0 ± 0.2 | p > 0.05 |
| 20 | 29.1 ± 0.1 | 30.6 ± 0.2 | 1.6 ± 0.2 | p < 0.05 |
| 30 | 29.7 ± 0.5 | 30.9 ± 0.4 | 1.2 ± 0.3 | p < 0.05 |
| 40 | 30.0 ± 0.1 | 31.2 ± 0.4 | 1.2 ± 0.4 | p < 0.05 |
| 50 | 26.3 ± 0.1 | 28.3 ± 0.4 | 2.0 ± 0.4 | p < 0.05 |
| 60 | 25.3 ± 0.2 | 27.4 ± 0.3 | 2.1 ± 0.2 | p > 0.05 |
Water temperature (°C).
Total Nitrogen and Total Phosphorus
TN concentrations in the overlying water of the elevated temperature treatments were higher on average than in the controls at 6.43 ± 0.96 mg/L to 5.38 ± 0.42 mg/L respectively (t-test, p = 0.049), and also significantly higher in the elevated temperature treatments on day 40, day 50 and day 60 (one-way ANOVA, treatment effect, p < 0.05, Figure 1).
FIGURE 1
TP concentrations in overlying water were also higher in the elevated temperature treatments than in the controls (t-test, p = 0.043) at 0.23 ± 0.06 mg/L and 0.16 ± 0.05 mg/L respectively, being significantly higher in the elevated temperature treatments on three out of six sampling occasions (day 30, 40 and 60, one-way ANOVA, p < 0.05, Figure 1).
Planktonic Algal Biomass
The biomass of planktonic algae (Chl a) was higher on average in the elevated temperature treatments than in the controls (t-test, p = 0.041) and on each sampling occasion except for day 40 and day 60 (one-way ANOVA, treatment effect, p < 0.05; Figure 2).
FIGURE 2
Total Suspended Solids and Light Intensity
TSS concentrations (Figure 3) were higher on average in the elevated temperature treatments than in the controls (t-test, p = 0.012) at 19.50 ± 3.44 mg/L to 13.46 ± 2.78 mg/L respectively. Significantly higher TSS values were recorded in the elevated temperature treatments on each sampling occasion except for day 10 and day 30 (one-way ANOVA, treatment effect, p < 0.05).
FIGURE 3
Light intensity (Figure 3) at the sediment surface was lower on average in the elevated temperature treatments than in the controls (t-test, p = 0.039) at 9565 ± 4403 lx to 15119 ± 3383 lx respectively. Reduced light intensity was recorded in the elevated temperature treatments on all sampling occasions except for day 10 and day 30 (one-way ANOVA, treatment effect, p < 0.05).
Benthic Algal Biomass
The biomass of benthic algae (Chl a) was lower on average in the elevated temperature treatments than in the controls (t-test, p = 0.003), and significantly so on every sampling occasion except for day 10 and day 30 (one-way ANOVA, treatment effect, p < 0.05; Figure 4).
FIGURE 4
Discussion
We found that elevated temperature increased the nutrient concentrations of TN and TP in the overlying water, enhanced growth of planktonic algae (Chl a), increased TSS concentration, decreased light intensity at the sediment surface and reduced benthic algal biomass (Chl a).
The water temperature of the black covered mesocosms was 1.2–2.1°C (1.7°C on average) higher than in the controls. According to the Sixth Scientific Assessment Report (), global average temperatures increased 1.5°C from 1880 to 2018. This rate of increase has been observed in lakes world-wide (); and in some lakes, summer temperatures has increased 1.5°C in the last decades alone (, Oneida Lake, NY, United States). Globally, the water temperature of rivers is expected to increase 0.8–1.6°C more in between 2071 and 2100 than between 1971 and 2000 (van Vliet et al., 2013). Thus, the treatment applied in our study resulted in heating comparable to real-world examples.
The increased nutrients (both TN and TP) in the overlying water of the elevated temperature treatments probably points to increased release from the sediments (). A water temperature increase of 3–4°C, is sufficient to double the release rate of P (). Further inputs of nutrients may be associated with rain events and atmospheric deposition (). However, in this experiment, both the controls and the treatments mesocosms were maintained in the same garden of Anhui Agricultural University, so the N and P deposition from the atmosphere should be the same in both the different treatments. However, we cannot discount the possibility that some atmospheric N was added to the water N fixation by algae, as we did not monitor these algae separately in this study.
That elevated temperature can enhance the growth of planktonic algae is well-established (e.g., ). found a 15% increase in planktonic algae for every 1°C increase in average annual temperature. In addition, elevated temperature can enhance the release of nutrients from the sediment (), which may lead to an increase in the growth of planktonic algae and thus increase in TSS. Further, increases of planktonic algae and TSS can reduce water clarity and thereby limit benthic algae growth due to increased light limitation. Our results are consistent with this literature. We found a reduction in light intensity at the sediment surfaces of the elevated temperature treatments, and a lower benthic algae biomass compared with the controls, indicating increased competitive advantage of planktonic algae over benthic algae. Such a decline or even disappearance of benthic algae will further enhance the release of nutrients from the sediment into overlying water, creating a positive feedback loop promoting planktonic algae growth (Spears et al., 2008; Zhang et al., 2013). Thus, the elevated temperature leads to the transfer of nutrients from benthic to planktonic habitats (; ; Zhang et al., 2015).
It is important to acknowledge that the effects of elevated temperature on the dynamics of benthic and planktonic algae in natural aquatic ecosystems will be more complex than in our mesocosm system, which excluded fish, benthic animals and submerged macrophytes, all of which may have important roles in the competitive interplay between benthic and planktonic algae (Zhang et al., 2014; Zhang et al., 2017; ; Mei et al., 2021). Furthermore, water flow and wave action typical for natural lake ecosystems were not accounted for in our experiments. However, there are calm, fishless or fish poor aquatic ecosystems, where conditions are similar to those simulated here.
The implications are that in similar natural systems, expected increase in temperature resulting from climate change will be conducive to the growth of planktonic algae and enhance their competitive advantage over benthic algae, leading to increased potential for eutrophication and deteriorating water quality. However, further studies at larger scale conditions and different trophic state and trophic structure are needed before general conclusions can be drawn about the effect of climate change on the benthic-pelagic coupling.
In conclusion, in our experimental system simulating shallow lake ecosystems, elevated temperature increased the growth of planktonic algae and enhanced their competitive advantage over the benthic algae, thereby contributing to eutrophication and a decline in water quality.
Statements
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.
Author contributions
Conceptualization: XM, XZ, and ZL Investigation: XM, SG, YL, and JH Funding acquisition XM Writing original draft: XM and SG. Writing; editing: XM, VR, LR, EJ, ZL, and XZ.
Funding
This research was supported by the National Natural Science Foundation of China (No. 41771100; 42011530017) and the Chinese-Belarusian Joint Project of Belarussian Republican Foundation for Fundamental Research (B18KI-007). EJ was supported by the Tübitak program BIDEB2232 (project 118C250).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Summary
Keywords
elevated temperature, planktonic algae, benthic algae, aquatic ecosystem, nutrient
Citation
Mei X, Gao S, Liu Y, Hu J, Razlustkij V, Rudstam LG, Jeppesen E, Liu Z and Zhang X (2022) Effects of Elevated Temperature on Resources Competition of Nutrient and Light Between Benthic and Planktonic Algae. Front. Environ. Sci. 10:908088. doi: 10.3389/fenvs.2022.908088
Received
30 March 2022
Accepted
22 April 2022
Published
12 May 2022
Volume
10 - 2022
Edited by
Jaan H. Pu, University of Bradford, United Kingdom
Reviewed by
Mohammad Amir Khan, Galgotias Educational Institutions, India
Manish Pandey, National Institute of Technology Warangal, India
Updates
Copyright
© 2022 Mei, Gao, Liu, Hu, Razlustkij, Rudstam, Jeppesen, Liu and Zhang.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Xiufeng Zhang, wetlandxfz@163.com
† These authors have contributed equally to this work
This article was submitted to Freshwater Science, a section of the journal Frontiers in Environmental Science
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.