Table 2. Total Emergent Aquatic Insect Number of Each Insect Group, Biomass, and Insect-Mediated PFAS Transfer per Day and Square Meter Collected at Lake Söderhavet (KS) in 2017 and 2018a.
| Year | Total number of individuals | Number of individuals (m–2 d–1) | Biomass (mg dw m–2 d–1) | PFAS transfer (ng m–2 d–1) | |
|---|---|---|---|---|---|
| Midges | 2017 | 358 | 77 | 96 | 112 |
| Midges | 2018 | 3653 | 33 | 6.6 | 3.6 |
| Alderflies | 2017 | 50 | 11 | 46 | 140 |
| Alderflies | 2018 | 36 | 1.5 | 9.9 | 21 |
| Damselflies | 2017 | 11 | 2.4 | 23 | 5.8 |
| Damselflies | 2018 | 32 | 0.6 | 6.5 | 3.8 |
| Stoneflies | 2017 | 3 | 0.6 | 14 | 17 |
| Caddisflies | 2018 | 5 | 0.1 | 3.0 | 1.0 |
a
The sum of each group in each year corresponds approximately the total PFAS transfer. Note that data on emergent aquatic insects are based on insects caught via deposition traps only.