The (*) hellbender and the now-extinct baiji could be found in these lotic ecosystems, whose productivity may be described by the flood pulse concept.
The photosynthesis to respiration ratio of these ecosystems first increases, then decreases according to a "continuum concept" of these ecosystems that explains how changes in the fine-to-coarse organic matter ratio affect shredders, collectors, and grazers. The (*) hellbender and the now-extinct baiji could be found in these lotic ecosystems, whose productivity may be described by the flood pulse concept. Their oxygen concentrations vary with pH and turbidity, and their edges are riparian zones. For 10 points, name these ecosystems with flowing water, like the Mississippi.
The photosynthesis to respiration ratio of these ecosystems first increases, then decreases according to a "continuum concept" of these ecosystems that explains how changes in the fine-to-coarse organic matter ratio affect shredders, collectors, and grazers.
rivers [or streams; accept lotic ecosystems before mentioned]