Synergistic effects of extreme temperature and low salinity on foundational macroalga Fucus vesiculosus in the northern Baltic Sea
| Autor: | Elina Leskinen, Antti Takolander, Mar Cabeza |
|---|---|
| Přispěvatelé: | Biosciences, Centre of Excellence in Metapopulation Research, Tvärminne Zoological Station, Environmental Sciences, Mar Cabeza-Jaimejuan / Principal Investigator, Ecology and Evolutionary Biology, Marine Ecosystems Research Group, Global Change and Conservation Lab |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Marine biology Environmental change Ecology 010604 marine biology & hydrobiology Fucus vesiculosus Biota Aquatic Science Biology Photosynthetic efficiency Photosynthesis biology.organism_classification 010603 evolutionary biology 01 natural sciences Salinity 13. Climate action Environmental chemistry Seawater 14. Life underwater 1172 Environmental sciences Ecology Evolution Behavior and Systematics |
| Zdroj: | Journal of Experimental Marine Biology and Ecology. 495:110-118 |
| ISSN: | 0022-0981 |
| Popis: | Climate change has been identified as one of the biggest current drivers of environmental change. Climate model projections for the Baltic Sea forecast increased frequency and duration of extreme temperatures, together with declines in salinity , which are expected to have impacts on the biota. In this experimental study, the interacting effects of low salinity and short-term (8 days) extreme seawater temperatures, followed by an 11-day recovery period, on the foundational macroalga , Fucus vesiculosus , were investigated. To account for potential variation in the responses at local scale, individuals originating from two different local populations, a warm and a cold site were included. In experiments manipulating temperature (20 °C to 28 °C) and salinity (4 or 6), it was found that even an 8-day exposure to 26 °C or higher was detrimental to F. vesiculosus, causing extensive tissue necrosis. Tissue necrosis was enhanced by low salinity. Photosynthesis, measured as the steady-state electron transport rate (ETR) and maximum ETR, declined at 26 °C, and this effect was also enhanced by low salinity. Temperatures above 26 °C caused declines in light-limited photosynthetic efficiency (α), indicating direct physiological damage to PS II reaction centers. After 11 days of recovery, some photosynthetic parameters recovered in the 26 °C, but not in the 28 °C treatment. It is concluded that Baltic F. vesiculosus populations may be severely affected even by short-term (8 days) exposure to high seawater temperatures when combined with the synergistic effects of low salinity predicted for the future Baltic Sea. |
| Databáze: | OpenAIRE |
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