Clearance rates of two batches (1 and 2) of cultured G. childressi mussels filtering phytoplankton. Batch 1 mussels ('small': 51 ± 3 mm SD, 'large': 77 ± 4 mm SD) received either Rhodomonas or Nannochloropsis cells. Batch 2 mussels from were cultured under different nutritional treatments (CH4: 'M', algae + CH4: MA', only algae: 'A'). The measurement of clearance rates of batch 2 G. childressi cultured in the 'A' treatment (without CH4 supply) was conducted twice: once while mussels were placed in CH4-enriched seawater, and, subsequently, once without CH4.
The cryptophyte Rhodomonas salina was subjected to various concentrations of supernatants of Alexandrium (A. pseudogonyaulax, A. monilatum) for 3 or 24 h. Then, the percentage of intact R. salina cells was quantified microscopically. This dataset comprises all cell counts from the R. salina bioassays used to construct dose-response curves. The experiments were carried out between November 9, 2023 and March 26, 2024 in the laboratories at the Alfred-Wegener-Institute in Bremerhaven, Germany.