Subfossil chironomid assemblages as indicators of recent hypolimnetic oxygen changes. Subfossil chironomid assemblages as indicators of recent hypolimnetic oxygen changes. Using CCA and RDA ordinations, oxygen-related measures were shown to explain a significant portion of variation in chironomid assemblages.
Results suggest that for most lakes there has been little change in hypolimnetic oxygen.
However, more lakes showed inferred declines in oxygen versus increases.