Data from: Spatial contraction of demersal fish populations in a large marine ecosystem ...

• Main Authors: Orio, Alessandro, Bergström, Ulf, Florin, Ann-Britt, Lehmann, Andreas, Šics, Ivo, Casini, Michele
• Format: Dataset
• Language: English
• Published: Dryad 2019
• Subjects: Platichthys flesus; depth preference; habitat contraction; Spatial distribution; Gadus morhua
• Online Access: https://dx.doi.org/10.5061/dryad.kb2f352; https://datadryad.org/stash/dataset/doi:10.5061/dryad.kb2f352

Aim: The interdependencies between trophic interactions, environmental factors and anthropogenic forcing determine how species distributions change over time. Large changes in species distributions have occurred as a result of climate change. The objective of this study was to analyse how the spatial distribution of cod and flounder have changed in the Baltic Sea during the past four decades characterized by large hydrological changes. Location: Baltic Sea Taxon: Cod (Gadus morhua) and flounder (Platichthys flesus) Methods: Catch per unit of effort (CPUE) data for adult and juvenile cod and for adult flounder were modelled using Delta-Generalized additive models including environmental and geographical variables between 1979 and 2016. From the annual CPUE predictions for each species, yearly distribution maps and depth distribution curves were obtained. Mean depth and the depth range were estimated to provide an indication on preferred depth and habitat occupancy. Results: Adult and juvenile cod showed a ... : Data_cod_flounderAdult cod, juvenile cod and flounder CPUE data (in grams). The datasets contain also the associated bottom temperature, salinity and oxygen concentration of each haul as well as the latitude and longitude in decimal degrees. ...