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            <gco:CharacterString>Fisheries and Oceans Canada’s (DFO) National Biofouling Monitoring Program (BMP) has conducted annual field surveys to monitor the introduction, establishment, spread, species richness, and relative abundance of native and non-indigenous species (NIS) since 2006. Standardized monitoring protocols employed by DFO-Maritimes, -Gulf, and -Quebec Regions include biofouling collector plates deployed from May to October at intertidal and shallow subtidal, geo-referenced sites, including public and private docks, aquaculture lease sites, public and private marinas and yacht clubs. 
Initially in the Maritimes Region (2006-2017) collectors consisted of 3, 10 cm by 10cm PVC plates deployed in a vertical array and spaced approximately 40-cm apart with the shallowest plate hung at least 1 m below the surface to sample shallow subtidal and intertidal species (Sephton et al. 2011, 2017). Two replicate arrays were deployed at least 5 m apart per site. Since 2018, collector arrays were modified to enhance statistical replication, including 10 individual collectors deployed per site at 1 m depth and at least 5 m apart (as above) from May to October. The percent cover of AIS on all collectors was determined by visual examination and scored as follows; (i) ‘0’ = absent, (ii) ‘1’ = ≤25 % cover, (iii) ‘2’ = 25 to ≤50 %, (iv) ‘3’ = 50–75% , and (v) ‘4’ = &gt;75%. Average percent cover is provided for all NIS observed annually per site. Presence-absence indicates that an NIS was observed on at least one collector plate. 
One additional rocky intertidal species (Asian shore crab; Hemigrapsus sanguineus) was assessed via beach surveys as permitted by time and resources following its initial siting in St Mary’s Bay (Nova Scotia) in April 2020. Rapid assessment surveys conducted in the Fall of 2020 and 2021 were employed to delineate H. sanguineus’ distribution and relative abundance. Areas deemed suitable and at high risk for spread were targeted, including exposed rocky intertidal habitat in southwest regions of Nova Scotia and New Brunswick. Each rapid assessment consisted of 30-minute beach surveys per site conducted by 2 or 3 people (modified from Stephenson et al. 2011). During each survey, crabs were collected under rocks and seaweed in preferred cobble/boulder habitat (Lohrer et al. 2000). Count data was standardized for each site as the number of crabs collected per 30-min search per person.

Cite as:
DFO-Maritimes Biofouling Monitoring Program. Published October 2018, Updated December 2023. Coastal Ecosystems Science Division, Fisheries and Oceans Canada, Dartmouth, NS

Citations:
Sephton D, B Vercaemer, JM Nicolas, J Keays (2011) Monitoring for invasive tunicates in Nova Scotia, Canada (2006-2009) Aquatic Invasions 6: 391-403.

Sephton D, B Vercaemer, A Silva, L Stiles, M Harris, K Godin (2017) Biofouling monitoring for aquatic invasive species (AIS) in DFO Maritimes Regions (Atlantic shore of Nova Scotia and southwest New Brunswick): May-November, 2012-2015. Canadian Technical Report of Fisheries and Aquatic Sciences 3158: 72 pp.

Stephenson EH, RS Steneck, RH Seeley (2009) Possible temperature limits to range expansion of non-native Asian shore crabs in Maine. Journal of Experimental Marine Biology and Ecology 375: 21–31. doi:10.1016/j.jembe.2009.04.020</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#fra">Le programme national de surveillance des salissures marines de Pêches et Océans Canada (MPO) effectue des relevés annuels sur le terrain pour surveiller l’introduction, l’établissement, la propagation, la richesse des espèces et l’abondance relative des espèces indigènes et non indigènes depuis 2006. Les protocoles de surveillance normalisés employés par les régions des Maritimes, du Golfe et du Québec du MPO comprennent des plaques collectrices de biosalissures déployées de mai à octobre à des sites géoréférencés intertidaux et subtidaux peu profonds, y compris des quais publics et privés, des sites des concessions aquacoles, des marinas publiques et privées et des clubs nautiques. 
Initialement, dans la région des Maritimes (2006-2017), les collecteurs consistaient en trois plaques en PVC de 10 cm sur 10 cm déployées en réseau vertical et espacées d’environ 40 cm, la plaque la moins profonde étant suspendue à au moins 1 m sous la surface pour échantillonner les espèces subtidales et intertidales peu profondes (Sephton et al. 2011, 2017). Deux réseaux répétés ont été déployés à au moins 5 m de distance par site. Depuis 2018, les réseaux de collecteurs ont été modifiés pour améliorer la réplication statistique, y compris 10 collecteurs individuels déployés par site à 1 m de profondeur et à au moins 5 m de distance (comme ci-dessus) de mai à octobre. Le pourcentage de couverture des espèces aquatiques envahissantes sur tous les collecteurs a été déterminé par examen visuel et noté comme suit : (i) ‘0’ = absent, (ii) ‘1’ = ≤ 25 % de couverture (iii) ‘2’ = 25 à ≤ 50 %, (iv) ‘3’ = 50 à 75 % et (v) ‘4’ =&gt; 75 %. La couverture moyenne en pourcentage est fournie pour toutes les espèces non indigènes observées annuellement par site. La présence et l’absence indiquent qu’une espèce non indigène a été observée sur au moins une plaque collectrice. 
Une autre espèce intertidale rocheuse (le crabe sanguin; Hemigrapsus sanguineus) a été évaluée par l’intermédiaire de relevés de plage, selon le temps et les ressources disponibles, à la suite du site, qui a été initialement installé dans la baie St. Marys (Nouvelle-Écosse) en avril 2020. Des relevés d’évaluation rapide effectués à l’automne 2020 et 2021 ont été employés pour délimiter la distribution et l’abondance relative de H. sanguineus. Les zones jugées appropriées et à haut risque pour la propagation ont été ciblées, notamment l’habitat intertidal rocheux exposé dans les régions du sud ouest de la Nouvelle-Écosse et du Nouveau-Brunswick. Chaque évaluation rapide consistait en des relevés de plage de 30 minutes par site effectués par deux ou trois personnes (modifié de Stephenson et al. 2011). Au cours de chaque relevé, les crabes ont été recueillis sous les rochers et les algues dans l’habitat préféré des galets et des rochers (Lohrer et al. 2000). Les données de dénombrement ont été standardisées pour chaque site comme le nombre de crabes recueillis par 30 minutes de recherche et par personne.

Doit être cité comme suit :
Programme de surveillance des salissures marines de la région des Maritimes du MPO. Publié en octobre 2018, mis à jour en Décembre 2022. Division de la science des écosystèmes côtiers, Pêches et Océans Canada, Dartmouth (Nouvelle-Écosse).

Références :
Sephton D, B Vercaemer, JM Nicolas, J Keays (2011) Monitoring for invasive tunicates in Nova Scotia, Canada (2006-2009) Aquatic Invasions 6: 391-403.

Sephton D, B Vercaemer, A Silva, L Stiles, M Harris, K Godin (2017) Biofouling monitoring for aquatic invasive species (AIS) in DFO Maritimes Regions (Atlantic shore of Nova Scotia and southwest New Brunswick): May-November, 2012-2015. Canadian Technical Report of Fisheries and Aquatic Sciences 3158: 72 pp.

Stephenson EH, RS Steneck, RH Seeley (2009) Possible temperature limits to range expansion of non-native Asian shore crabs in Maine. Journal of Experimental Marine Biology and Ecology 375: 21–31. doi:10.1016/j.jembe.2009.04.020.</gmd:LocalisedCharacterString>
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