Tropical bloom-forming mesoalgae Cladophoropsis sp. and Laurencia sp.-responses to ammonium enrichment and a simulated heatwave.

Autor: Fricke A; WG Algae and Seagrass Ecology, Leibniz Centre for Tropical Marine Research (ZMT), Bremen, Germany.; Department Plant Quality and Food Security, Leibniz Institute of Vegetable and Ornamental Crops (IGZ), Großbeeren, Germany., Bast F; WG Algae and Seagrass Ecology, Leibniz Centre for Tropical Marine Research (ZMT), Bremen, Germany.; Department of Botany, Central University of Punjab, Ghudda VPO, Punjab, India., Moreira-Saporiti A; WG Algae and Seagrass Ecology, Leibniz Centre for Tropical Marine Research (ZMT), Bremen, Germany.; Marine Biological Laboratory, The Ecosystems Center, Woods Hole, Massachusetts, USA., Martins Bussanello G; Florianópolis (UFSC), R. Eng. Agronômico Andrei Cristian Ferreira, Federal University of Santa Catarina, Florianópolis, SC, Brazil., Msuya FE; Zanzibar Seaweed Cluster Initiative (ZaSCI), Zanzibar, Tanzania., Teichberg M; WG Algae and Seagrass Ecology, Leibniz Centre for Tropical Marine Research (ZMT), Bremen, Germany.; Marine Biological Laboratory, The Ecosystems Center, Woods Hole, Massachusetts, USA.
Jazyk: angličtina
Zdroj: Journal of phycology [J Phycol] 2024 Apr; Vol. 60 (2), pp. 554-573. Date of Electronic Publication: 2024 Feb 25.
DOI: 10.1111/jpy.13435
Abstrakt: Algal blooms are increasing worldwide, driven by elevated nutrient inputs. However, it is still unknown how tropical benthic algae will respond to heatwaves, which are expected to be more frequent under global warming. In the present study, a multifactorial experiment was carried out to investigate the potential synergistic effects of increased ammonium inputs (25 μM, control at 2.5 μM) and a heatwave (31°C, control at 25°C) on the growth and physiology (e.g., ammonium uptake, nutrient assimilation, photosynthetic performance, and pigment concentrations) of two bloom-forming algal species, Cladophoropsis sp. and Laurencia sp. Both algae positively responded to elevated ammonium concentrations with higher growth and chlorophyll a and lutein concentrations. Increased temperature was generally a less important driver, interacting with elevated ammonium by decreasing the algaes' %N content and N:P ratios. Interestingly, this stress response was not captured by the photosynthetic yield (Fv/Fm) nor by the carbon assimilation (%C), which increased for both algae at higher temperatures. The negative effects of higher temperature were, however, buffered by nutrient inputs, showing an antagonistic response in the combined treatment for the concentration of VAZ (violaxanthin, antheraxanthin, zeaxanthin) and thalli growth. Ammonium uptake was initially higher for Cladophoropsis sp. and increased for Laurencia sp. over experimental time, showing an acclimation capacity even in a short time interval. This experiment shows that both algae benefited from increased ammonium pulses and were able to overcome the otherwise detrimental stress of increasingly emerging temperature anomalies, which provide them a strong competitive advantage and might support their further expansions in tropical marine systems.
(© 2024 The Authors. Journal of Phycology published by Wiley Periodicals LLC on behalf of Phycological Society of America.)
Databáze: MEDLINE
Externí odkaz: