Date Start: 2017-04Date End: 2017-06Latitude/Longitude: Specimen of the macroalgae F. serratus were collected with and without colonies of E. pilosa from the intertidal zone at Weisennhauser Strand, off the Western Baltic coast (54°18'25''N, 10°45'08''E) in Germany on the 19th of March 2017Project: Buddy – Exploring functional interfaces: extreme biogenic fluctuations may amplify or buffer environmental stress on organisms associated with marine macrophytes (Grant Number: SA 2791/3-1).