Photosynthesis
- Not all submersed species are equally adapted to low light:
Elodea densa optimum at 107 lux (0.3% full sun) whereas Heteranthera dubia optimum at 6350 lux (18%)
- Accessory pigments allow for high variability in spectral preferences :
Elodea densa died under light 480-630 nm (yellow-green) whereas Heteranthera dubia grew 3 times greater.