Abstract
Methods for bioindication of early climate impacts in the marine ecosystem are unknown and being developed for the first time. The high rate of changes in the littoral barnacle Semibalanus balanoides (L.) populations is of key importance for bioindication. Mass mortality and significant decrease in the abundance over 1–3 years were observed in estuaries only and mainly associated with an increase of spring floods during the period of ongoing climate warming in the Arctic. The survival of the juveniles appeared in 2023 (up to 8000 sp/m2) fully depends on further climate changes.
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