RT Journal Article
T1 Heatwaves during low tide are critical for the physiological performance of intertidal macroalgae under global warming scenarios
A1 Román Geada, Marta
A1 Roman Del Valle, Salvador
A1 Vázquez Otero, Maria Elsa
A1 Souza Troncoso, Jesús
A1 Olabarría Uzquiano, Celia
K1 24 Ciencias de la Vida
K1 2417 Biología Vegetal (Botánica)
K1 2510.90 Geología Marina
AB 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 Fv/Fm, 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.
PB Scientific Reports
SN 20452322
YR 2020
FD 2020-12-08
LK http://hdl.handle.net/11093/2223
UL http://hdl.handle.net/11093/2223
LA eng
NO Scientific Reports, 10(21408): 1-14 (2020)
NO European Maritime and Fisheries Fund
DS Investigo
RD 17-mar-2025