Heatwaves during low tide are critical for the physiological performance of intertidal macroalgae under global warming scenarios

被引:26
作者
Roman, Marta [1 ,2 ]
Roman, Salvador [1 ,2 ]
Vazquez, Elsa [1 ,2 ]
Troncoso, Jesus [1 ,2 ]
Olabarria, Celia [1 ,2 ]
机构
[1] Univ Vigo, Dept Ecoloxia & Biol Anim, Fac Ciencias Mar, Campus Lagoas Marcosende S-N, Vigo 36310, Pontevedra, Spain
[2] Univ Vigo, CIM Grp Ecoloxia Costeira, Edificio CC Expt,Campus Vigo, Vigo 36310, Spain
关键词
ALGA FUCUS-SERRATUS; CLIMATE-CHANGE; MARGINAL POPULATIONS; DISTRIBUTION MODELS; DECADAL CHANGES; FUCOID ALGAE; HEAT WAVES; STRESS; RESPONSES; SEAWEEDS;
D O I
10.1038/s41598-020-78526-5
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The abundance and distribution of intertidal canopy-forming macroalgae are threatened by the increase in sea surface temperature and in the frequency and intensity of heatwaves caused by global warming. This study evaluated the physiological response of predominant intertidal macroalgae in the NW Iberian Peninsula (Bifurcaria bifurcata, Cystoseira tamariscifolia and Codium tomentosum) to increased seawater temperature during immersion and increased air temperatures during consecutive emersion cycles. We combined field mensuration and laboratory experiments in which we measured mortality, growth, maximum quantum yield and C:N content of the macroalgae. Air temperature was a critical factor in determining physiological responses and survivorship of all species, whereas high seawater temperature had sublethal effects. Cystoseira tamariscifolia suffered the greatest decreases in F-v/F-m, growth and the highest mortality under higher air temperatures, whereas C. tomentosum was the most resistant and resilient species. Two consecutive cycles of emersion under atmospheric heatwaves caused cumulative stress in all three macroalgae, affecting the physiological performance and increasing the mortality. The potential expansion of the warm-temperate species B. bifurcata, C. tamariscifolia and C. tomentosum in the NW Iberian Peninsula in response to increasing seawater temperature may be affected by the impact of increased air temperature, especially in a region where the incidence of atmospheric heatwaves is expected to increase.
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页数:14
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