English Science Mathematics & Statistics Describing ups and downs / peaks and troughs

SPAIN. Part of a text I'm revising/correcting, about "stoichiometry of invertebrate consumers ... in a Mediterranean stream". The phrase "peaked down" is obviously being used to mean "reached its lowest point", but I've never seen "peak" used this way. I'd normally say "bottomed out". I'd like to see some fellow translators' opinions on whether "peaked down" is appropriate/acceptable usage in this context. (The authors have also misspelt "peak" as "pick" in other sections of the text, so I'm reluctant to rely on their criteria).


"Changes in N:P ratios tightly mimicked C:P ones, as both were mainly driven by changes in P % (Table A2; Fig. 4). C:P ratios ***peaked down*** following stream flow cessation for all FFGs except for herbivores (Tukey’s test, P0.050). However, herbivore response slightly differed between taxa; Ancylus fluviatilis had higher C:P ratios in early spring than in the late recovery phase (Tukey’s test, P