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TitreMeasuring spatial and temporal benthic community change in Frobisher Bay, southern Baffin Island
TéléchargerTéléchargement (publication entière)
AuteurHerder, E; Misiuk, B; Aitken, A; Edinger, E
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; par Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Commission géologique du Canada, Dossier public 8295, 2017 p. 58, https://doi.org/10.4095/305858 (Accès ouvert)
LiensGeoHab 2017
Année2017
ÉditeurRessources naturelles Canada
Réunion2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/305858
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Commission géologique du Canada, Dossier public 8295
Formatspdf
ProvinceNunavut
SNRC25H; 25I; 25J; 25N; 25O; 25P
Lat/Long OENS -70.0000 -64.0000 64.0000 61.0000
Sujetstechniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement; écosystèmes; benthos; climat; glace marine; milieux de marée; échantillons prélevés au hasard; carottes; photographie; sédiments marins; levés géophysiques; levés acoustiques marins; levés au sonar; bathymétrie; biologie; géologie marine; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; géophysique
ProgrammeGéoscience de la gestion des océans, Géoscience en mer
Diffusé2017 09 26
Résumé(disponible en anglais seulement)
Benthic communities may be significantly impacted by long-term change as a result of anthropogenic or natural stressors. Arctic coastal regions are particularly at risk as seasonal sea ice retreats and previously ice covered regions open. Characterizing marine faunal biodiversity in Arctic regions through predictive habitat mapping is a crucial step towards protecting sensitive Arctic marine ecosystems. Benthic habitat maps provide a snapshot of the existing biological and physical environment while also providing a baseline of knowledge for long-term monitoring. Resampling of historical sites in Frobisher Bay, a large macro-tidal bay in southern Baffin Island, offers a unique opportunity to study temporal and spatial change in benthic communities.
Benthic infaunal samples were initially collected at twelve long-term ecology (LTE) stations using a grab sampler in inner Frobisher Bay from 1967-1976, providing seasonal and inter-annual benthic infaunal sample data for this region. In 2015 and 2016, the same LTE stations plus an additional eighteen stations were sampled nearby to a maximum water depth of 100 metres using a grab sampler, box core, and underwater towed video camera system. Benthic faunal samples and sediment samples collected for grain size analysis will be used to ground-truth multibeam bathymetry and backscatter data acquired between 2012 and 2016. Habitat maps produced from infaunal sample data will offer a visual depiction of current spatial community assemblages and allow for an assessment of spatial change based on historical infaunal community composition. This analysis will provide context for assessing temporal change in benthic communities in Frobisher Bay.
Polychaetous annelids were the dominant taxa observed at all stations sampled from 1967-1976. Other dominant taxa observed at stations near Iqaluit included oligochaetes, bivalves, and gastropods. Amphipods, ostracods and priapulids were observed at only a few of these stations in high densities. Ostracods were the second most dominant taxa at stations located to the south-east of Iqaluit. Amphipods, bivalves, cumaceans, pycnogonids, and tanaids varied among stations as the third most dominant taxon. Polychaetous annelids were dominant in the sorted 2016 benthic samples with amphipods, bivalves, gastropods, and ophiuroid echinoderms also present at all stations. Some stations near Iqaluit indicated the presence of isopods and ostracods while samples collected to the southeast of Iqaluit indicate the presence of ostracods, pycnogonids, shrimp, and bryozoan fragments. Towed video transects have been analyzed at four LTE stations. Two stations were dominated by tubiculous suspension-feeding polychaetes and ophiuroid echinoderms, however, different ophiuroid species were observed at each of these stations. One station was dominated by a red leafy macroalgae and ophiuroids and another station was dominated by a brown mat over the sediment along with the macroalgae Agarum sp. and Laminaria sp. Community structure analysis performed on the historical and new sample data will evaluate the extent of temporal change of benthic communities in inner Frobisher Bay.
GEOSCAN ID305858