RT Journal Article
T1 A warmer Arctic compromises winter survival of habitat-forming seaweeds
A1 López-Gordillo, Francisco Javier
A1 Carmona-Fernández, Raquel
A1 Jiménez-Gámez, Carlos
K1 Algas marinas
K1 Cambios climáticos
AB Continuous winter darkness at a latitude of 79_N was simulated in cultures of fourspecies of Arctic seaweeds at 3 and 8°C. The laminarians Saccharina latissima andAlaria esculenta, and the rhodophytes Phycodrys rubens and Ptilota gunneri weremonitored for 4 months in total darkness and after 1 week following light return inearly spring, under controlled laboratory conditions. Biomass loss during darknesswas enhanced by the high temperature in all species. At 8°C, the two laminarianswere unable to resume growth upon re-illumination. Alaria esculenta showed newblade production by the end of the dark period, but only at 3°C. In all species, the photosynthetic ability was sustained, not suspended, during the whole dark period. P. rubens exhibited lower photosynthetic potential at 8°C than at 3°C duringthe darkness period, but it was able to recover its O2 evolving potential upon reillumination, as P. gunneri and S. latissima did, but the latter only at 3°C. The reactivation of photosynthesis seemed to involve photosystem II over photosystem I, as 7 d of photoperiod after the prolonged darkness was not enough to fully recover the PAM-related photosynthetic parameters. Only small changes were recorded in theinternal chemical composition (total C, total N, carbohydrates, proteins, and lipids), butspecies-specific differences were observed. Unlike subarctic areas with an operatingphotoperiod along the year, a warmer polar night might pose a limit to the ability ofmulti-year seaweeds to occupy the new ice-free illuminated areas of the Arctic coasts,so that newcomers will potentially be restricted to the spring-summer season.
PB Frontiers in Marine Science
YR 2022
FD 2022
LK https://hdl.handle.net/10630/40395
UL https://hdl.handle.net/10630/40395
LA eng
NO Gordillo FJL, Carmona R and Jiménez C (2022) A Warmer Arctic Compromises Winter Survival of Habitat-Forming Seaweeds. Front. Mar. Sci. 8:750209. doi: 10.3389/fmars.2021.750209
NO Spanish Ministry of Science, Innovation and Universities (project CGL2015-67014R).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 25 ene 2026