|Titre||Modeling distributions of cold-water corals in the Newfoundland and Labrador region using MaxEnt|
|Télécharger||Téléchargement (publication entière) |
|Auteur||Gullage, L; Edinger, E; Devillers, R|
|Source||Program 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. 54, https://doi.org/10.4095/305854 (Accès ouvert)|
|Liens||GeoHab 2017 |
|Éditeur||Ressources naturelles Canada|
|Réunion||2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017|
|Media||en ligne; numérique|
|Référence reliée||Cette 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|
|Province||Terre-Neuve-et-Labrador; Région extracotière de l'est; Région extracotière du nord|
|SNRC||1; 2; 3; 11; 13; 14|
|Lat/Long OENS|| -64.0000 -44.0000 60.0000 44.0000|
|Sujets||techniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement;
écosystèmes; marges continentales; plate-forme continentale; talus continental; glacis continental; benthos; établissement de modèles; bathymétrie; Plate-Forme de Terre-Neuve; Plate-Forme du Labrador; Coraux; Éponges; biologie; géologie
|Programme||Géoscience de la gestion des océans, Géoscience en mer|
|Diffusé||2017 09 26|
|Résumé||(disponible en anglais seulement)|
Species distribution models (SDMs) are increasingly used in ecology and conservation to predict species distributions based on benthic habitat requirements.
SDMs help when designing conservation approaches for regions lacking detailed data on species requiring protection; however, such approaches are limited by the quality of the training data, and by the modeling approaches used. In order to support the
design of marine protected areas that can protect cold-water corals and sponges in the Newfoundland and Labrador region, Eastern Canada, we used MaxEnt to model the distributions of 19 coral species belonging to four functional groups: large
gorgonians, small gorgonians, sea pens, and soft corals.
Coral distribution data from 2004-2011, obtained from the Department of Fisheries and Oceans Canada (DFO) multi-species trawl surveys, were used to generate SDMs. These data encompass the
south coast of Newfoundland, the Grand Banks, the Flemish Pass, Northeast Newfoundland Shelf, and Labrador shelf to 60N. Environmental datasets used to generate models included: GEBCO bathymetry, six terrain attributes derived from bathymetry, bottom
temperature and salinity, and surface chlorophyll A concentrations.
Modeled distributions predicted greatest coral abundance along the continental shelf break and upper slope throughout the region. When analyzed at the functional group level,
large gorgonians were predicted to be most abundant off northern Labrador, off the central Labrador shelf, and in parts of the SW Grand Banks. Small gorgonian distributions were most concentrated along the Labrador Shelf break, the NE Newfoundland
Shelf break, as well as along the shelf break of the SW Grand Banks. Sea pen distributions were greatest along the SW Grand Banks and the south coast, particularly within the Laurentian Channel. In contrast, soft corals were most abundant on the bank
tops. Agreement between observed and modeled distributions was assessed using area under the curve (AUC), true skill statistics (TSS), and comparisons with independent datasets. Findings consistently illustrated high model accuracy (e.g. AUC >0.9).
Analysis of predicted distributions at the species level found large differences among species within functional groups, particularly among the large gorgonians. Results indicate that coral functional groups based on taxonomy do not group species
sharing similar environmental preferences, and that SDMs should instead be performed on individual species of interest. Furthermore, previous models for the region based upon Random Forest modeling have predicted sponge and coral habitats extend into
deep water areas of the continental rise. Our study does not confirm those predictions, and limited knowledge of the bathyal and abyssal depths in these regions do not suggest appropriate bottom types for these species. In contrast, our results
predict coral distributions are concentrated along the continental slope and shelf break, having a high level of agreement with the training dataset, and with predicted global distributions of the same taxa. Our models suggest that conservation
efforts for corals should be concentrated at the shelf-break and upper continental slope, where they are known to occur, rather than in deep-water areas where they might occur, and where there are fewer competing human uses than on the shelf break
and upper slope.