首页|Photosynthetic response to a winter heatwave in leading and trailing edge populations of the intertidal red alga Corallina offi-cinalis(Rhodophyta)

Photosynthetic response to a winter heatwave in leading and trailing edge populations of the intertidal red alga Corallina offi-cinalis(Rhodophyta)

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Marine heatwaves(MHWs)caused by anthropogenic climate change are becoming a key driver of change at the ecosystem level.Thermal conditions experienced by marine organisms across their distribution,particularly towards the equator,are likely to approach their physiological limits,resulting in extensive mortality and subsequent changes at the population level.Populations at the margins of their species'distribution are thought to be more sensitive to climate-induced environmental pressures than central populations,but our understanding of variability in fitness-related physiological traits in trailing versus leading-edge populations is limited.In a laboratory simulation study,we tested whether two leading(Iceland)and two trailing(Spain)peripheral populations of the intertidal macroalga Corallina officinalis display different levels of maximum potential quantum efficiency(Fv/Fm)resilience to current and future winter MHWs scenarios.Our study revealed that ongoing and future local winter MHWs will not negatively affect leading-edge populations of C.officinalis,which exhibited stable photosynthetic efficiency throughout the study.Trailing edge populations showed a positive though non-significant trend in photosynthetic efficiency throughout winter MHWs exposure.Poleward and equatorward populations did not produce significantly different results,with winter MHWs having no negative affect on Fv/Fm of either population.Additionally,we found no long-term regional or population-level influence of a winter MHWs on this species'photosynthetic efficiency.Thus,we found no statistically significant difference in thermal stress responses between leading and trailing populations.Nonetheless,C.officinalis showed a trend towards higher stress responses in southern than northern populations.Because responses rest on a variety of local population traits,they are difficult to predict based solely on thermal pressures.

marginal populationcoralline algaeclimate changeecophysiologyphotophysiologymacroalgaeFv/Fm

Regina Kolzenburg、Federica Ragazzola、Laura Tamburello、Katy R.Nicastro、Christopher D.McQuaid、Gerardo I.Zardi

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Umeå Marine Sciences Centre,Umeå University,905 71 Norrbyn,Sweden

University of Portsmouth,Institute of Marine Science,Portsmouth PO49LY,UK

Stazione Zoologica Anton Dohrn,Genova Marine Center,Genova 16126,Italy

Stazione Zoologica Anton Dohrn,Sicily Marine Center,Palermo 90149,Italy

Department of Zoology and Entomology,Rhodes University,Makhanda(Grahamstown)6139,South Africa

Centre of Marine Sciences,University of Algarve,Faro 8005-139,Portugal

Laboratoire d'Océanologie et de Géosciences,Université de Lille,Lille 59000,France

Université de Caen Normandie,Laboratoire de Biologie des Organismes et des Ecosystèmes Aquatiques,Caen 14032,France

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Funda??o para a Ciência e Tecnologia(FCT-MEC,Portugal)South African Research Chairs Initiative(SARChI)of the Department of Science and TechnologyNational Research Foundation of South AfricaFund of European Unions'Horizon 2020 Research and Innovation Programme under the Marie Sk?odowska-CurieWINNINGNormandy Program supported by the Normandy Region for Gerardo Zardi

UIDB/04326/202064801101034329

2024

10.1007/s13131-023-2275-6

海洋学报(英文版)
中国海洋学会

海洋学报(英文版)

CSTPCD
影响因子：0.323
ISSN：0253-505X
年,卷(期)：2024.43(7)