Yes, Maya said different algae were present at different temperatures.
Diatoms were much more
common in colder waters, and various types of green algae favored the
As the river’s temperature increased, the amount of algae also increased.
Then it declined as the water cooled slightly at our final sampling site.
I didn’t find this too surprising since very few species of algae
are best suited to live in cold waters—and those that are don’t
seem to grow very quickly. Now, however, I understand another reason algae
grow faster in warmer sections of the river. Algae need bicarbonates to
grow and the thermal runoff provides plenty.