Monitoring of sessile and mobile epifauna – Considerations for non-indigenous species
2019
Outinen, Okko | Forsström, Tiia | Yli-Rosti, Juho | Vesakoski, Outi | Lehtiniemi, Maiju
The present study aimed to develop monitoring methods for shallow water sessile and mobile epifauna with the main focus on enhancing the chance of early detection for new non-indigenous species (NIS) invasions. The field sampling was conducted between June and September in 2012, in the Archipelago Sea (Finland). The tested monitoring methods included baited traps that capture organisms and habitat collectors that provide habitat and refuges for organisms, as well as fouling plates. Catch efficiency of a trap/collector was defined as the number of NIS and all species caught, including their abundances. The American collector with oyster shells (habitat collector) caught the highest number of NIS, and their use is recommended in all places, where oyster shells are easily accessible. Sampling of all habitats of interest between 1 and 2 m depth is recommended with at least three habitat collectors per site. Highlights • Sampling of mobile and sessile epifauna with habitat collectors is recommended. • Habitat traps should provide attachment surfaces, habitats and refuges to organisms. • Sampling of all habitats present between 1 and 2 m depth is recommended. • Deployment of 3 collectors per site is suggested for routine coastal monitoring. • Timing and duration of sampling may differ significantly between geographical areas.
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