Data from: Seasonal dynamics of spatial distribution and overlap between Northeast Arctic cod (Gadus morhua) and capelin (Mallotus villosus) in the Barents Sea ...

• Main Authors: Fall, Johanna, Ciannelli, Lorenzo, Skaret, Georg, Johannesen, Edda
• Format: Dataset
• Language: English
• Published: Dryad 2018
• Subjects: Generalised Additive Models; ecosystem survey; spatially variant effects; synoptic data collection; Barents Sea; winter survey; spatially explicit models; Mallotus villosus; overlap index; spatial association; Arctic; Arctic cod; Gadus morhua; Northeast Arctic cod
• Online Access: https://dx.doi.org/10.5061/dryad.pv3rc1m; https://datadryad.org/stash/dataset/doi:10.5061/dryad.pv3rc1m

The trophic link between cod (Gadus sp.) and capelin (Mallotus sp.) is important in many panarctic ecosystems. Since the early 2000s, the Northeast Arctic cod stock (G. morhua) in the Barents Sea has increased greatly, and the sea has been exceptionally warm. Such changes have potentially large effects on species distributions and overlap, which in turn could affect the strength of species interactions. Due to its high latitude location, the Barents Sea has strong seasonal variation in physical conditions and interactions. To study drivers of variation in cod-capelin overlap, we use data from two annual surveys run in winter and in autumn of 2004-2015. We first model winter and autumn spatial distributions of mature and immature cod and capelin. We then calculate overlap from model predictions on a grid with similar spatial resolution as the survey data. Our approach allowed us to interpret changes in overlap as species-specific effects of stock size and temperature, while accounting for sampling variation ... : Ecosystem survey 2004-2015Field-collected data on cod and capelin distribution from the Norwegian parts of the ecosystem survey 2004-2015. For details see README file.Norwegian part of ecosystem survey cod-capelin 2004-2015.txtWinter survey 2004-2015Field-collected data on cod and capelin distribution from the Norwegian parts of the winter survey 2004-2015. For details see README file.Norwegian part of winter survey cod-capelin 2004-2015.txt ...