Sensitivity of Photosynthesis to Warming in Two Similar Species of the Aquatic Angiosperm Ruppia from Tropical and Temperate Habitats
| Autor: | Lina M. Rasmusson, Aekkaraj Nualla-ong, Pimchanok Buapet, Martin Gullström, Tarawit Wutiruk, Mats Björk |
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| Rok vydání: | 2021 |
| Předmět: |
Ruppia
NPQ seagrass Geography Planning and Development TJ807-830 PAM fluorometry Management Monitoring Policy and Law TD194-195 Renewable energy sources Temperate climate Ruppia maritima GE1-350 Fv/F0 Local adaptation Environmental effects of industries and plants biology Renewable Energy Sustainability and the Environment Ecology Fv/Fm Biota biology.organism_classification Environmental sciences Seagrass Ruppia cirrhosa Productivity (ecology) marine heatwaves |
| Zdroj: | Sustainability Volume 13 Issue 16 Sustainability, Vol 13, Iss 9433, p 9433 (2021) |
| ISSN: | 2071-1050 |
| Popis: | Climate change-related events, such as marine heatwaves, are increasing seawater temperatures, thereby putting pressure on marine biota. The cosmopolitan distribution and significant contribution to marine primary production by the genus Ruppia makes them interesting organisms to study thermal tolerance and local adaptation. In this study, we investigated the photosynthetic responses in Ruppia to the predicted future warming in two contrasting bioregions, temperate Sweden and tropical Thailand. Through DNA barcoding, specimens were determined to Ruppia cirrhosa for Sweden and Ruppia maritima for Thailand. Photosynthetic responses were assessed using pulse amplitude-modulated fluorometry, firstly in short time incubations at 18, 23, 28, and 33 °C in the Swedish set-up and 28, 33, 38, and 43 °C in the Thai set-up. Subsequent experiments were conducted to compare the short time effects to longer, five-day incubations in 28 °C for Swedish plants and 40 °C for Thai plants. Swedish R. cirrhosa displayed minor response, while Thai R. maritima was more sensitive to both direct and prolonged temperature stress with a drastic decrease in the photosynthetic parameters leading to mortality. The results indicate that in predicted warming scenarios, Swedish R. cirrhosa may sustain an efficient photosynthesis and potentially outcompete more heat-sensitive species. However, populations of the similar R. maritima in tropical environments may suffer a decline as their productivity will be highly reduced. |
| Databáze: | OpenAIRE |
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