5 files are included in the object: Abundance data of the infaunal communities collected from two depth zones in four fjords along a long latitudinal gradient Biomass data of the infaunal communities collected from two depth zones in four fjords along a long latitudinal gradient Biological trait data for the collected taxa. Modalities for three biological traits are included (feeding mode, maximum size, life span) Habitat clasification for the studied locations R code for conducting RLQ analyses using the provided data