Table 2 Distribution and abundances (ind./0.1 m2) of thyasirid bivalves during the study period. N = number of Van Veen grab (0.1 m2) samples. Values expressed as mean ± S.D. note: only presence (+) / absence (-) data are available for 2020
|  | Saltfjord | Skerstadfjord | Sørfolda | |||||
|---|---|---|---|---|---|---|---|---|
2013 (n = 16) | 2015 (n = 6) | 2020 (n = 6) | 2013 (n = 22) | 2015 (n = 6) | 2020 (n = 6) | 2015 (n = 22) | 2020 (n = 5) | |
Parathyasira equalis | 0.9 ± 0.9 | 19.5 ± 4.3 | + | 18.5 ± 18.3 | 45.0 ± 13.3 | + | 14.8 ± 6.6 | + |
Parathyasira dunbari | - | - | - | 1.2 ± 1.8 | 6.7 ± 4.2 | + | - | - |
Thyasira obsoleta | - | 0.2 ± 0.4 | - | - | - | - | 15.7 ± 5.8 | + |
Thyasira sarsii | - | - | - | 0.1 ± 0.4 | 0.8 ± 2.0 | + | - | - |
Genaxinus eumyarius | - | - | - | - | - | - | 12.1 ± 8.6 | + |
Mendicula ferruginosa | - | - | - | - | - | - | 5.0 ± 3.5 | + |
Thyasiridae indet. | 0.6 ± 1.0 | - | - | 1.7 ± 2.3 | 12.8 ± 13.1 | - | 0.2 ± 0.9 | - |