Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction
The decline in freshwater calcium has become a new environmental stressor to Daphnia with high calcium demand, however, the population dynamics and sexual reproduction of Daphnia under low calcium stress are still lack of deep understanding. To evaluate the impact of declined calcium on Daphnia from...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Ecotoxicology and Environmental Safety |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651322001920 |
| _version_ | 1819121518063386624 |
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| author | Jing Huang Zihang Wang Bo Yu Yunfei Sun Lei Gu Lu Zhang Yuan Huang Zhou Yang |
| author_facet | Jing Huang Zihang Wang Bo Yu Yunfei Sun Lei Gu Lu Zhang Yuan Huang Zhou Yang |
| author_sort | Jing Huang |
| collection | DOAJ |
| description | The decline in freshwater calcium has become a new environmental stressor to Daphnia with high calcium demand, however, the population dynamics and sexual reproduction of Daphnia under low calcium stress are still lack of deep understanding. To evaluate the impact of declined calcium on Daphnia from population level, we respectively exposed two clones of Daphnia pulex (CH and SH) to different calcium concentrations (0.5, 1.0, 1.5, 5.0, 10.0, 25.0 mg L−1) for 30 days and recorded the population indicators. Results showed that total biomass, average dry weight per individual, total number of ephippia, total number of resting eggs of Daphnia pulex CH clone at 1.0 mg L−1 calcium decreased by 75.5%, 34.0%, 83.6%, and 77.6% compared with those at 25 mg L−1 calcium, while SH clone at 1.0 mg L−1 calcium decreased by 64.6%, 26.1%, 94.5%, and 82.2%, respectively. Importantly, Ca content in dry Daphnia pulex population of CH clone at 1.0 and 1.5 mg L−1 calcium decreased by 32.7% and 6.7% compared to those at 25 mg L−1 calcium, and SH clone at 1.0 mg L−1 and 1.5 mg L−1 calcium also decreased by 30.9% and 10.5%, respectively. Furthermore, low calcium significantly decreased the perimeter and surface area of ephippia. Interestingly, observation by scanning electron microscope found that low calcium changed the surface of ephippia. The negative impact of calcium decline on Daphnia population and sexual reproduction will inevitably endanger the persistence of species and genes at meta population level. |
| first_indexed | 2024-12-22T06:37:50Z |
| format | Article |
| id | doaj.art-aeb33b66524e440e90cb6d05f985f44d |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-22T06:37:50Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-aeb33b66524e440e90cb6d05f985f44d2022-12-21T18:35:32ZengElsevierEcotoxicology and Environmental Safety0147-65132022-03-01233113352Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproductionJing Huang0Zihang Wang1Bo Yu2Yunfei Sun3Lei Gu4Lu Zhang5Yuan Huang6Zhou Yang7Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaJiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaCorresponding author.; Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing 210023, ChinaThe decline in freshwater calcium has become a new environmental stressor to Daphnia with high calcium demand, however, the population dynamics and sexual reproduction of Daphnia under low calcium stress are still lack of deep understanding. To evaluate the impact of declined calcium on Daphnia from population level, we respectively exposed two clones of Daphnia pulex (CH and SH) to different calcium concentrations (0.5, 1.0, 1.5, 5.0, 10.0, 25.0 mg L−1) for 30 days and recorded the population indicators. Results showed that total biomass, average dry weight per individual, total number of ephippia, total number of resting eggs of Daphnia pulex CH clone at 1.0 mg L−1 calcium decreased by 75.5%, 34.0%, 83.6%, and 77.6% compared with those at 25 mg L−1 calcium, while SH clone at 1.0 mg L−1 calcium decreased by 64.6%, 26.1%, 94.5%, and 82.2%, respectively. Importantly, Ca content in dry Daphnia pulex population of CH clone at 1.0 and 1.5 mg L−1 calcium decreased by 32.7% and 6.7% compared to those at 25 mg L−1 calcium, and SH clone at 1.0 mg L−1 and 1.5 mg L−1 calcium also decreased by 30.9% and 10.5%, respectively. Furthermore, low calcium significantly decreased the perimeter and surface area of ephippia. Interestingly, observation by scanning electron microscope found that low calcium changed the surface of ephippia. The negative impact of calcium decline on Daphnia population and sexual reproduction will inevitably endanger the persistence of species and genes at meta population level.http://www.sciencedirect.com/science/article/pii/S0147651322001920CalciumDaphnia pulexPopulationSexual reproductionEphippia |
| spellingShingle | Jing Huang Zihang Wang Bo Yu Yunfei Sun Lei Gu Lu Zhang Yuan Huang Zhou Yang Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction Ecotoxicology and Environmental Safety Calcium Daphnia pulex Population Sexual reproduction Ephippia |
| title | Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction |
| title_full | Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction |
| title_fullStr | Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction |
| title_full_unstemmed | Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction |
| title_short | Population changes of Daphnia caused by declined calcium concentration: Evidences from population dynamics and sexual reproduction |
| title_sort | population changes of daphnia caused by declined calcium concentration evidences from population dynamics and sexual reproduction |
| topic | Calcium Daphnia pulex Population Sexual reproduction Ephippia |
| url | http://www.sciencedirect.com/science/article/pii/S0147651322001920 |
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