Linked from
The 12 pages that link to Chlorophyll a, each with the reason it gives.
EutrophicationRelated: Its concentration helps track algal responses to nutrient enrichment.
PlanktonRelated: Its concentration is widely used as an indicator of phytoplankton biomass.
ArchaeplastidaRelated: It is shared by cyanobacteria and the primary plastids of Archaeplastida.
ChlorophytaRelated: Chlorophyta shares this core pigment with other photosynthetic lineages.
FucoxanthinRelated: Fucoxanthin transfers captured energy toward chlorophyll a.
GlaucophyteRelated: Glaucophyte plastids use chlorophyll a to capture light.