Photoperiod and temperature interactions drive the latitudinal distribution ofLaminaria hyperborea(Laminariales, Phaeophyceae) under climate change

• DOI: 10.1111/jpy.13497
• Publication Date: 2024-09-12T16:45:45Z
• Authors: Nora Diehl; Philipp Laeseke; Inka Bartsch; Margot Bligh; Hagen Buck‐Wiese; Jan‐Hendrik Hehemann; Sarina Niedzwiedz; Niklas Plag; Ulf Karsten; Tifeng Shan; Kai Bischof
• Keywords: Norway; Arctic Regions; Photoperiod; Climate Change; Temperature; Laminaria; Photosynthesis; Seaweed

Abstract Due to global rises in temperature, recent studies predict marine species shifting toward higher latitudes. We investigated the impact of interacting abiotic drivers on distribution potential temperate kelp Laminaria hyperborea . The ecosystem engineering is widespread along European coasts but has not yet been observed High Arctic, although it can survive several months low temperatures and darkness. To investigate its ability extend northward future, we conducted a long‐term multifactorial experiment with sporophytes from Porsangerfjorden, Norway—close species' documented northernmost margin. samples were exposed three different photoperiods (PolarDay, LongDay, PolarNight) at 0°C, 5°C, 10°C for 3 months. Optimum quantum yield photosynthesis ( F v / m ), dry weight, pigments, phlorotannins, storage carbohydrates monitored. Both physiological biochemical parameters revealed that L. was strongly influenced by their interaction while temperature alone exerted only minor effects. data integrated into model project possible expansion combination extended day lengths appeared be limiting reason spread until recently. However, water reaching summer, this will able thrive also Arctic. Moreover, no evidence stress Arctic winter warming observed. Consequently, high spreading further which may significantly affect structure function ecosystems.