1
|
Kan D, Zhang Y, Zeng J, Lian H, Feng L, Feng Y, Liu X, Han C, Yang J. Physiological response and molecular mechanisms against UV-B radiation in Brachionus asplanchnoidis (Rotifera). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 262:115319. [PMID: 37542982 DOI: 10.1016/j.ecoenv.2023.115319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/24/2023] [Accepted: 07/31/2023] [Indexed: 08/07/2023]
Abstract
Ultraviolet B (UV-B, 280-320 nm) radiation is a major environmental stressor for aquatic organisms on Earth's surface. Its effects on biological systems are well known, but the mechanisms by which organisms respond and adapt to UV-B radiation are still being explored. In this study, we investigated the effects of UV-B radiation on the monogonont rotifer Brachionus asplanchnoidis, focusing on physiological parameters, antioxidant systems, DNA damage, and DNA repair-related molecular mechanism. Our results showed that the LD50 was at 28.53 kJ/m2, indicating strong tolerance to UV-B. However, UV-B radiation caused adverse effects on growth and reproduction, with shortened reproductive period and longevity, decreased fecundity and hatchability, and inhibition of population growth. Biochemical analyses revealed severe oxidative damage and lipid peroxidation, with increased ROS and MDA levels. Activities of antioxidant enzymes were highly induced at low doses but decreased at high doses. DNA damage also occurred in UV-B-exposed rotifers. Furthermore, selected DNA repair-related genes were up-regulated in a dose-dependent manner. These findings provide a comprehensive understanding of the effects of UV-B radiation on rotifers and highlight the importance of considering both ecological and molecular responses in assessing the impact of UV-B radiation on aquatic organisms.
Collapse
Affiliation(s)
- Dongqi Kan
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Yu Zhang
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Jiancheng Zeng
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Hairong Lian
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China; School of Ecology and Environment, Anhui Normal University, Wuhu, Anhui Province 241002, People's Republic of China
| | - Lei Feng
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Yifan Feng
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Xiaojie Liu
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Cui Han
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China
| | - Jiaxin Yang
- School of Marine Science and Engineering, Nanjing Normal University, Nanjing, Jiangsu Province 210023, People's Republic of China.
| |
Collapse
|
2
|
Wang Z, Wang Y, Qin S, Yang Z, Sun Y. Polystyrene microplastics weaken the predator-induced defenses of Daphnia magna: Evidences from the changes in morphology and behavior. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 316:120657. [PMID: 36379287 DOI: 10.1016/j.envpol.2022.120657] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/10/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Abstract
Polystyrene microplastics are ubiquitous in freshwater ecosystems and have significant impacts on freshwater organisms. Stable interspecific relationships, including the predation and defense relationships between predator and prey, play an extremely important role in maintaining the health of aquatic ecosystems. However, it still remains unknown whether polystyrene microplastics can interfere with predator-induced defenses of prey, especially in behavior change. Therefore, we studied the effects of different particle sizes and concentrations of polystyrene microplastics on the induced defenses related to morphology, reproduction, and behavior of Daphnia magna exposed to the predation risks from a species of zooplanktivorous fish Rhodeus ocellatus. Results showed that polystyrene microplastics weakened the predator-induced defenses of D. magna, including morphology, reproduction, and behavior. Polystyrene microplastics did not affect the beat rate of the second antennae (swimming activity) and thoracic appendage (filter-feeding activity) of D. magna, but R. ocellatus kairomone reduced Daphnia swimming activity. Moreover, in the absence of R. ocellatus predation risks, polystyrene microplastics did not alter the vertical distribution of D. magna in the water column, whereas D. magna exposed to R. ocellatus kairomone stayed deeper in the water; however, when both polystyrene microplastics and fish kairomone were present, D. magna inhabited in shallower water. Furthermore, small-sized microplastics interfered with the inducible behavioral defense of D. magna more strongly than large-sized polystyrene microplastics. Such findings suggested that polystyrene microplastics can weaken the predator-induced defenses of Daphnia, which may increase their risk of predation and alter the population dynamics of zooplankton.
Collapse
Affiliation(s)
- Zihang Wang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yixiang Wang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Shanshan Qin
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Zhou Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yunfei Sun
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
| |
Collapse
|
3
|
Zhang R, Zhao Y, Liu J, Yang S, Jing L. The response of bacterial community to UVB was significantly different between immature periphyton and mature periphyton, but not for physiological indicators. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 246:114185. [PMID: 36244171 DOI: 10.1016/j.ecoenv.2022.114185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/22/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
Periphyton has important ecological functions. It can even exist in environments with strong ultraviolet radiation. However, knowledge of periphyton under ultraviolet is limited, which limits the understanding and application of periphyton in environments with high ultraviolet radiation. In this study, immature periphyton (IMP) and mature periphyton (MP) under ultraviolet B (UVB) irradiation were investigated and compared in terms of physiological characteristics and bacterial community. Analysis of the physiological characteristics showed that the response patterns of IMP and MP to UVB were similar. IMP and MP could adapt to UVB of 1 W/m2 well. However, high-intensity UVB (2 and 3 W/m2) reduced the periphyton biomass, inhibited photosynthesis and antioxidant enzyme activity and caused severe lipid peroxidation in both IMP and MP. Integrated Biological Response (IBR) analysis and toxicological model fitting showed that the ED50 values of UVB for IMP and MP were 1.25 and 1.50 W/m2, respectively. 16 S rRNA gene analysis showed that in both IMP and MP, bacterial community composition, assembly and function were affected by UVB. In addition, the response of the bacterial community in IMP to UVB was stronger than that in MP. The diversity of the IMP community was inhibited by UVB, but that of the MP community was not. Proteobacteria and Deinococcus-Thermus are key microorganisms responsible for tolerance to UVB stress. Neutral community model fitting showed that both UVB and the development process caused the determinism of bacterial succession. However, UVB may weaken the deterministic process caused by development. Functional prediction showed that many metabolic functions of periphyton were inhibited by UVB in IMP and MP. However, UVB caused different changes (enhancement or inhibition) of some ecological functions in them. This study provides valuable information for understanding periphyton in environments with UVB radiation, which may be used to improve the application of periphyton in these environments.
Collapse
Affiliation(s)
- Run Zhang
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China; Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Yue Zhao
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China; Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Jia Liu
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China; Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Shengtao Yang
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China; Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Liandong Jing
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China; Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China.
| |
Collapse
|
4
|
Employment of algae-based biological soil crust to control desertification for the sustainable development: A mini-review. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
5
|
Ren L, Huang J, Ding K, Wang Y, Yang Y, Zhang L, Wu H. Comparative Study of Algal Responses and Adaptation Capability to Ultraviolet Radiation with Different Nutrient Regimes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19095485. [PMID: 35564879 PMCID: PMC9104955 DOI: 10.3390/ijerph19095485] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 04/24/2022] [Accepted: 04/28/2022] [Indexed: 02/04/2023]
Abstract
Frequent outbreaks of harmful algal blooms (HABs) represent one of the most serious outcomes of eutrophication, and light radiation plays a critical role in the succession of species. Therefore, a better understanding of the impact of light radiation is essential for mitigating HABs. In this study, Chlorella pyrenoidosa and non-toxic and toxic Microcystis aeruginosa were mono-cultured and co-cultured to explore algal responses under different nutrient regimes. Comparisons were made according to photosynthetically active radiation (PAR), UV-B radiation exerted oxidative stresses, and negative effects on the photosynthesis and growth of three species under normal growth conditions, and algal adaptive responses included extracellular polymeric substance (EPS) production, the regulation of superoxide dismutase (SOD) activity, photosynthetic pigments synthesis, etc. Three species had strain-specific responses to UV-B radiation and toxic M. aeruginosa was more tolerant and showed a higher adaptation capability to UV-B in the mono-cultures, including the lower sensitivity and better self-repair efficiency. In addition to stable μmax in PAR ad UV-B treatments, higher EPS production and enhanced production of photosynthetic pigments under UV-B radiation, toxic M. aeruginosa showed a better recovery of its photosynthetic efficiency. Nutrient enrichment alleviated the negative effects of UV-B radiation on three species, and the growth of toxic M. aeruginosa was comparable between PAR and UV-B treatment. In the co-cultures with nutrient enrichment, M. aeruginosa gradually outcompeted C. pyrenoidosa in the PAR treatment and UV-B treatment enhanced the growth advantages of M. aeruginosa, when toxic M. aeruginosa showed a greater competitiveness. Overall, our study indicated the adaptation of typical algal species to ambient UV-B radiation and the stronger competitive ability of toxic M. aeruginosa in the UV-radiated waters with severer eutrophication.
Collapse
Affiliation(s)
- Lingxiao Ren
- School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China; (K.D.); (Y.W.); (L.Z.); (H.W.)
- Correspondence: ; Tel.: +86-158-5066-2170
| | - Jing Huang
- Three Gorges Beijing Enterprises Nanjing Water Group Co., Ltd., Nanjing 210000, China;
| | - Keqiang Ding
- School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China; (K.D.); (Y.W.); (L.Z.); (H.W.)
| | - Yi Wang
- School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China; (K.D.); (Y.W.); (L.Z.); (H.W.)
| | - Yangyang Yang
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China;
| | - Lijuan Zhang
- School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China; (K.D.); (Y.W.); (L.Z.); (H.W.)
| | - Haoyu Wu
- School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China; (K.D.); (Y.W.); (L.Z.); (H.W.)
| |
Collapse
|
6
|
Liu Q, Liu L, Huang J, Gu L, Sun Y, Zhang L, Lyu K, Yang Z. The response of life history defense of cladocerans under predation risk varies with the size and concentration of microplastics. JOURNAL OF HAZARDOUS MATERIALS 2022; 427:127913. [PMID: 34865906 DOI: 10.1016/j.jhazmat.2021.127913] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 11/11/2021] [Accepted: 11/24/2021] [Indexed: 06/13/2023]
Abstract
Microplastics are an emerging and increasingly serious pollutant in freshwater environment, which have become a threat to freshwater organisms. However, whether microplastics interfere with the responses of organisms to their predators is still unclear. In this study, we investigated the effects of microplastics with tiny different particle size (diameter: 0.7 and 1 µm) on the anti-predation (Rhodeus ocellatus as the predator) defense responses of different body-sized cladocerans, Daphnia pulex and Moina macrocopa. Results showed that microplastics had a size-based inhibitory effect on the induced defense of both D. pulex and M. macrocopa. Specifically, 0.7 µm microplastics had stronger effects on reduced survival time, delayed maturation time, and decreased offspring numbers. In addition, the effects of microplastics also varied with different body-sized cladocerans, i.e. medium-sized cladoceran (D. pulex) were more sensitive than the small-sized one (M. macrocopa) regarding the maturation time. This study illustrated for the first time that the effect of microplastics on induced defense was related to cladoceran species and microplastics size, and further revealed the extensive negative effects of microplastics from the perspective of interspecific relationship.
Collapse
Affiliation(s)
- Qi Liu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Leihong Liu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Jing Huang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Lei Gu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Yunfei Sun
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Lu Zhang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Kai Lyu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Zhou Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China.
| |
Collapse
|
7
|
Song H, Wei L, Zhong M, Chen X, Xie C, Chen X, Wang X, Huang B, Liu Y, Zhang M, Qi Y, Wang X. Ambient ultraviolet B radiation induced valve behavioral acclimation of Pacific oyster which resulted from the different response strategies of smooth and striated adductor muscles. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 228:113035. [PMID: 34863076 DOI: 10.1016/j.ecoenv.2021.113035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/18/2021] [Accepted: 11/25/2021] [Indexed: 06/13/2023]
Abstract
Light not only conveys image-forming vision but also has an impact on various physiological functions. In particular, ultraviolet B (UVB) radiation has the closest relationship with living organisms. For Pacific oysters (Crassostrea gigas), alteration of valve behavior is one of the most important ways responding to ambient UVB. In the present study, the response of adult C. gigas to sunlight (especially UVB) was evaluated by monitoring valve activity and further elucidated at the physiological and metabolomic levels. After exposure, the valve activity of C. gigas demonstrated flexible acclimation to the ambient conditions. The potential adjustment of osmoregulation and oxidative stress might be related to ambient UVB radiation. Mycosporine-like amino acids might contribute to the protection of C. gigas against UVB, while precursors of β-alanine and degradation products of 5-hydroxytryptamine might adjust the contraction of the adductor muscles. The different responses of the adductor muscles (smooth and striated) were manifested in signal transduction and metabolisms of energy and nucleotide. This study not only indicated the correlation between the valve behavioral changes in oysters and light radiation, especially UVB, but illustrated the acclimation strategies of oysters to ambient light (UVB) environment.
Collapse
Affiliation(s)
- Hongce Song
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Lei Wei
- School of Agriculture, Ludong University, Yantai 264025, PR China.
| | - Mingyu Zhong
- Ocean School, Yantai University, Yantai 264005, PR China
| | - Xi Chen
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Chaoyi Xie
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Xiao Chen
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Xiaona Wang
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Baoyu Huang
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Yaqiong Liu
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Meiwei Zhang
- School of Agriculture, Ludong University, Yantai 264025, PR China
| | - Yitao Qi
- Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Developing of Endangered Chinese Crude Drugs in Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an 710119, PR China
| | - Xiaotong Wang
- School of Agriculture, Ludong University, Yantai 264025, PR China.
| |
Collapse
|
8
|
Wu S, Yu K, Ding X, Song F, Liang X, Li Z, Peng L. Transcriptomic analyses reveal dynamic changes of defense response in Glycyrrhiza uralensis leaves under enhanced ultraviolet-B radiation. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2021; 163:358-366. [PMID: 33915442 DOI: 10.1016/j.plaphy.2021.04.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 04/09/2021] [Indexed: 06/12/2023]
Abstract
The amount of solar ultraviolet-B (UV-B) radiation reaching the Earth's surface is increasing due to stratospheric ozone dynamics and global climate change. Increased UV-B radiation poses a major threat to ecosystems. Although many studies have focused on the potential effects of enhanced UV-B radiation on plants, the dynamic changes of defense response in plants under continuous UV-B radiation remains enigmatic. In this study, we investigated the effect of UV-B radiation at 0.024 W/m2 on the UVR8-and reactive oxygen species (ROS-) signaling pathways, antioxidant system, and wax synthesis of G. uralensis. These parameters were investigated at different UV-B radiation stages (2 h, 6 h, 12 h, 24 h, 48 h, and 96 h). The results revealed that the uvr8 expression level was significantly repressed after 2 h of UV-B radiation, partly because G. uralensis rapidly acclimated to UV-B. Significant H2O2 accumulation occurred after 12 h UV-B radiation, resulting in activation of the ROS signaling pathway and the antioxidant system. After 24 h of UV-B radiation, wax synthesis was enhanced alongside a decrease in the capacity of the main antioxidant system. The dynamic and ordered changes in these pathways reveal how different strategies function in G. uralensis at different times during adaption to enhanced UV-B radiation. This study will help us better understand dynamic changes of defense response in plant under enhanced UV-B radiation, further providing fundamental knowledge to develop plant resistance gene resources.
Collapse
Affiliation(s)
- Shijie Wu
- School of Life Sciences, Ningxia University, Yinchuan, 750021, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China
| | - Kaiqiang Yu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China
| | - Xiaoli Ding
- School of Life Sciences, Ningxia University, Yinchuan, 750021, China
| | - Fuyang Song
- School of Life Sciences, Ningxia University, Yinchuan, 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, 750021, China
| | - Xinhua Liang
- School of Life Sciences, Ningxia University, Yinchuan, 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, 750021, China
| | - Zhenkai Li
- School of Life Sciences, Ningxia University, Yinchuan, 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, 750021, China
| | - Li Peng
- School of Life Sciences, Ningxia University, Yinchuan, 750021, China; Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, 750021, China.
| |
Collapse
|
9
|
Sun Y, Chen Y, Wei J, Zhang X, Zhang L, Yang Z, Huang Y. Ultraviolet-B radiation stress alters the competitive outcome of algae: Based on analyzing population dynamics and photosynthesis. CHEMOSPHERE 2021; 272:129645. [PMID: 33465615 DOI: 10.1016/j.chemosphere.2021.129645] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/10/2021] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
The solar ultraviolet-B radiation (UVB) is increasingly affecting the aquatic ecosystems due to the long-term antropic damage to the stratospheric ozone. The distrupted interspecies competition is one of the primary causes driving the plankton community composition shifts under UVB stress. To reveal the competitive responses to enhanced UVB radiation, we grew two green algae Scenedesmus obliquus and Chlorella pyrenoidosa, and the unicellular cyanobacterium Microcystis aeruginosa in monocultures and in cocultures under differerent UVB intensities (0, 0.3 and 0.7 W m-2), respectively. Results showed that elevated UVB radiation consistently decreased the population carrying capacies and the photosynthesis of the three species in monocultures. While cocultivated, C. pyrenoidosa was competively excluded by the presence of S. obliquus, and the competitive outcome was not affected by UVB exposure. By contrast, unicellular M. aeruginosa overwhelmingly suppressed the population growth of S. obliquus under no UVB, yet S. obliquus tended to be a better competitor under 0.3-0.7 W m-2 UVB exposure. The species-specific photosynthesis sensitivity to UVB can partly explain the different tolerance of the algae to UVB and the change of competition outcome under elevated UVB. The present study elucidated the potential role of increased UVB radiation in determining the competitions between phytoplankton species, contributing to the understanding of phytoplankton community shifts under enhanced UVB stress.
Collapse
Affiliation(s)
- Yunfei Sun
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yitong Chen
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Junjun Wei
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Xingxing Zhang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Lu Zhang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Zhou Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yuan Huang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
| |
Collapse
|
10
|
Zhang L, Sun Y, Cheng J, Cui G, Huang Y, Yang Z. Warming mitigates the enhancement effect of elevated air CO 2 on anti-grazer morphological defense in Scenedesmus obliquus. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 770:145341. [PMID: 33517020 DOI: 10.1016/j.scitotenv.2021.145341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 01/16/2021] [Accepted: 01/17/2021] [Indexed: 06/12/2023]
Abstract
Atmospheric CO2 and temperature are increasing, which will have substantial impacts on interactions among organisms. While each stressor in isolation has been studied extensively, there has been less focus on their combined effects on the interspecies interaction. In order to reveal how warming and elevated CO2 interact on the induced defense of phytoplankton, we investigated the combined influences of elevated CO2 (750 ppm vs 390 ppm) and high temperature (28 °C and 31 °C vs 25 °C) on grazer Daphnia-induced morphological defense in Scenedesmus obliquus. Results showed that S. obliquus formed big-sized colonies (e.g., four- and eight-celled colonies) as response to Daphnia infochemicals, resulting in an increase in the number of cells per particle. Elevated CO2 further decreased the proportion of unicells from >40% in the populations growing at 390 ppm CO2 without Daphnia filtrate to <7% in the populations growing at 750 ppm CO2 with Daphnia filtrate, with the formation of more than 90% colonies, thus enhancing this morphological defense in S. obliquus. However, under elevated CO2, increasing temperature up to 31 °C remarkably increased the four-celled colonies by at least 159% but decreased the eight-celled colonies by 37% compared with 25 °C. As a result, the maximum cells per particle were significantly decreased to the 390 ppm CO2-grown level at high temperature. The time to reach the maximum cells per particle was also shortened by high temperature under elevated CO2. These results suggest that high temperature has an overwhelming inhibitory effect on the enhanced anti-grazer defense by elevated CO2, which provides significant implications for forecasting the predator-prey interaction changes in freshwater ecosystem under future climate regimes.
Collapse
Affiliation(s)
- Lu Zhang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Yunfei Sun
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Jiahui Cheng
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Guilian Cui
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Yuan Huang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China
| | - Zhou Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, China.
| |
Collapse
|