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Description: Krill is a generic name for crustaceans of the order Euphausiids, most of which are found in the species Thysanoessa raschii and Meganyctiphanes norvegica in eastern Canada. Krill is an important food resource for many marine mammals, in particularthe blue whale.The layer was produced at our request, at a monthly resolution, by Caroline Lehoux and Stéphane Plourde from the mathematical model developed in Plourde et al. 2016(see Data source section). The model allowed to calculate the probability of meeting a strong aggregation of krill over a period of 10 years. High krill aggregations are defined as the 95th percentile of predicted biomass in 10x10 km cells covering the Estuary and Gulf of St. Lawrence (see Treatment section for more details). A threshold was then set so that only those cells where the high krill aggregations were observed over 6 years or more, not consecutive, were retained. Location: the layer represents the probabilities of strong aggregations in the Estuary and Gulf of Saint Lawrence where we retained only those cells where the probability appears over 6 years or more. However, it should be noted that the 95th percentile is calculated on a grid having a resolution of 10 km and an extent of 72.5°W with 35°W and 42°N with 58°N as used in Plourde et al. 2016. Data source:For the treated data: Plourde, S., Lehoux, C., McQuinn, I.H., and Lesage, V. (2016). Describing krill distribution in the western North Atlantic using statistical habitat models. DFO Can. Sci. Advis.Sec. Res. Doc. 2016/111. v+ 34p. http://waves-vagues.dfo-mpo.gc.ca/Library/40599991.pdfFor the data of the acoustic statements used for the predictions : Plourde, S., McQuinn, I.H., Lesage, V., Lehoux, C., Jolly, P., Bourassa, MN. in Prep. Space distribution of krill in eastern Canadian waters: a climatological appraoch based there is historical plankton net and acoustic data.Period represented on the layer: A grid per month from April to November over the period 2005-2014. This period differs from the period of sampling of the data used in the model to predict the biomass (see following section)#fra Le krill est un nom générique pour décrire des crustacés de l'ordre des Euphausiacés où l'on retrouve en grande majorité les espècesThysanoessa raschii et Meganyctiphanes norvegicadans l'est du Canada.Le krill est une ressource alimentaire importante pour de nombreux mammifères marins dont la baleine bleue.La couche a été produite à notre demande, à une résolution mensuelle, par Caroline Lehoux et Stéphane Plourde à partir du modèle mathématique développé dans Plourde et al. 2016. Le modèle a permis de calculer la probabilité de rencontrer une forte agrégation de krill sur une période de 10 années. Les fortes agrégationsde krillsont définies par le 95e percentile de la biomasseprédite dans des cellules de 10x10 km couvrant l'estuaire et le golfe du Saint-Laurent (voir la section Traitement pour plus de détails).On a ensuite établi un seuil de manière à ne conserver que les cellules où les fortes agrégations de krill ont été observées sur 6 années ou plus, non consécutives. Localisation : la couche représente les probabilités de fortes agrégations dans l'estuaire et le golfe du Saint-Laurent où l'on a retenu seulement les cellules où cette probabilité est apparue 6 années et plus. Cependant, il est à noter que le 95e percentile est calculé sur une grille ayant une résolution de 10 km x 10 km et une étendue allant de 72.5°W à 35°W et de 42°N à 58°N tel qu’utilisé dans Plourde et al. 2016.Source de données : Le modèle mathématique utilisé est décrit dans: Plourde, S., Lehoux, C., McQuinn, I.H., and Lesage, V. (2016). Describing krill distribution in the western North Atlantic using statistical habitat models. DFO Can. Sci. Advis. Sec. Res. Doc. 2016/111. v + 34p.http://waves-vagues.dfo-mpo.gc.ca/Library/40599991.pdfPour les données des relevés acoustiques ayant servies aux prédictions: Plourde, S., McQuinn, I.H., Lesage, V., Lehoux, C., Joly, P., Bourassa, M-N. in prep. Spatial distribution of krill in eastern Canadian waters: a climatological appraoch based on historical plankton net and acoustic data.Période représentée sur la couche : Une grille par mois d’avril à novembre pour la période 2005-2014. Cette période diffère de la période d’échantillonnage des données utilisées dans le modèle ayant servi à prédire la biomasse (voir section suivante)

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Copyright Text: For processed data : Plourde, S., Lehoux, C., McQuinn, I.H., and Lesage, V. (2016). Describing krill distribution in the western North Atlantic using statistical habitat models. DFO Can. Sci. Advis. Sec. Res. Doc. 2016/111. v + 34 p. For the data of the acoustic statements used for the predictions: Plourde, S., McQuinn, I.H., Lesage, V., Lehoux, C., Joly, P., Bourassa, M-N. in prep. Spatial distribution of krill in eastern Canadian waters: a climatological appraoch based on historical plankton net and acoustic data. #fra Pour les données traitées : Plourde, S., Lehoux, C., McQuinn, I.H., and Lesage, V. (2016). Describing krill distribution in the western North Atlantic using statistical habitat models. DFO Can. Sci. Advis. Sec. Res. Doc. 2016/111. v + 34 p. Pour les données des relevés acoustiques ayant servies aux prédictions: Plourde, S., McQuinn, I.H., Lesage, V., Lehoux, C., Joly, P., Bourassa, M-N. in prep. Spatial distribution of krill in eastern Canadian waters: a climatological appraoch based on historical plankton net and acoustic data.

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