Table 1. Classification and key morphological characteristics of the study species.

Species	ID #	Division	Class	Size	Key Characteristics
fast-growing, susceptible to grazing
Nannochloris oculata	––	Chlorophyta	Chlorophyceae	2–3 µm	non-motile, green to yellow
Dunalliela tertiolecta	1320	Chlorophyta	Chlorophyceae	6–11 µm	biflagellate, green pigments at posterior
Rhodomonas sp.	768	Cryptophyta	Cryptophyceae	11–16 µm	biflagellate, red to light brown
slow-growing, potentially defended against grazers
Chaetoceros decipiens	173	Heterokontophyta	Bacillariophyceae	10–26 µm	straight chains, long setae, yellow to brown
Melosira octogona_cf	483	Heterokontophyta	Coscinodiscophyceae	19–25 µm	cylindrical cells, chain-forming, yellow to brown
Coscinodiscus sp.	1583	Heterokontophyta	Coscinodiscophyceae	75–90 µm	solitary, thick frustules, yellow to brown

Species were divided into two functional groups, as indicated. Identification numbers from the National Center for Marine Algae and Microbiota (formerly the CCMP) are listed. Measurements of cell length and width or diameter and height were made on at least 25 cells per species. Size ranges encompass all dimensions.