Dataset: Results of light-limited growth experiments including the full range of volatile organic compounds (VOCs) produced by the diatom T. weissflogii and alga D. tertiolecta during laboratory experiments conduced in Sept of 2023

VOCs were collected from axenic.Dunaliella tertiolecta (urn:lsid:marinespecies.org:taxname:178590) and Thalassiosira weissflogii (urn:lsid:marinespecies.org:taxname:163513) using proton transfer reaction time-of-flight mass spectroscopy (PTR-TOF/MS; Ionicon, Austria) as previously described (Moore et al., 2020). Autoclaved f/2+Si media was measured alongside the samples as blank (background) controls. 100 ml culture, media, or HPLC water was transferred to a dynamic stripping chamber (Halsey et al., 2017)and bubbled with breathing-grade air passed first through a hydrocarbon trap and then through a glass frit in the bottom of the chamber at 50 ml min^-1 for 5 min to strip VOCs from the sample. The stripped gasses were directed into the PTR-ToF/MS for measurement via soft ionization with H₃O⁺. The mass spectrum (30-240 a.m.u.) was acquired at 5 s intervals.  PTR-TOF/MS data were analyzed using PTR viewer 3.4.3 (Ionicon Analytik). A three-point calibration was performed on each .h5 file using a search range of 0.2 m/z. Within the three-point calibration mode, each mass spectrum was calibrated against three internal standards known to be present within the spectrum, namely 29.998 (NO+), 203.943, and 330.848 (1,3-diiodobenzene).