Location of each of the sampling sites along the Swedish western and southern coasts. (1) Tjärnö near the Tjärnö Marine Laboratory (formerly Sven Lovén Centre for Marine Sciences Tjärnö), 58°52’41.0 N 11°06’56.0 E; (2) Fiskebäckskil near the Sven Lovén Centre for Marine Sciences Kristineberg, 58°14’52.1 N 11°27’05.8 E; (3) Halmstad at Påarp Beach, 56°36’10.0 N 12°54’48.3 E; (4) Kåseberga, just east of Ales stenar, 55°23’00.6 N 14°03’46.5 E; (5) Landön western side, 55°58’20.6 N 14°24’29.6 E.