Comparative depth profiles of aggregate abundance and other parameters in Year 4. a) Year 4 vertical distribution of mean aggregate abundance, water column density (σ_T), chlorophyll concentration (µg L^–1) and particulate organic carbon concentration (POC; µmol L^–1) in a) early summer (n = 3) andb) late summer (n = 2). Chlorophyll and POC were derived from CTD profiles of fluorescence and optical transmission. Scales are the same in both panels to facilitate comparison. DOI:https://doi.org/10.1525/elementa.355.f4