首页|Thermal fluctuations and nitrogen enrichment synergistically accelerate biomass yield of Pyropia haitanensis
Thermal fluctuations and nitrogen enrichment synergistically accelerate biomass yield of Pyropia haitanensis
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NSTL
Elsevier
Coastal ecosystems are increasingly affected by recurring and frequent extreme temperature events as well as by high nutrient load. Current warming scenarios indicate that rapidly fluctuating temperatures will become the norm; however, the interactive effects of global and local stressors on the performance of coastal species (especially under environmental fluctuations) have not been investigated. This study evaluated the combined effects of elevated temperature and nitrogen enrichment on the ecophysiology of algae Pyropia haitanensis. Algae were exposed to three different temperature regimes (20 degrees C, 24 degrees C, and increasing from 20 degrees C to 24 degrees C, then decreasing to 20 degrees C at a rate of 1 degrees C per day) and two nutrient concentrations (40 mu mol center dot L-1 and 300 mu mol center dot L-1). The resulting growth rates, photosynthetic performances, and photosynthetic pigment concentrations were determined and compared between treatments. All three metrics increased with increasing temperature, but decreased when the temperature increased at the thermal threshold of P. haitanensis (24 degrees C). Moreover, under fluctuating temperatures condition, both growth and pigment contents increased significantly. These results indicate that in current warming scenarios, both the yield and quality of P. haitanensis would improve. This effect is further increased by elevated nitrogen supply, due to coastal eutrophication.
NSTL
Elsevier
