biostudies-literatureUnknown12(4)Lorz ANUnderstanding the ecological requirements and thresholds of individual species is crucial to better predict potential outcomes of climate change on species distribution. In particular, species optima and lower and upper limits along resource gradients require attention. Based on Huisman-Olff-Fresco (HOF) models, we determined species-specific responses along gradients of nine environmental parameters including depth in order to estimate niche attributes of 30 deep-sea benthic amphipods occurring around Iceland. We, furthermore, examined the relationships between niche breadth, occupancy, and geographic range assuming that species with a wider niche are spatially more widely dispersed and vice versa. Overall, our results reveal that species react very differently to environmental gradients,Ecology and evolutione8802https://www.ebi.ac.uk/biostudies/studies/S-EPMC8986549biostudies-literatureNiche breadth and biodiversity change derived from marine Amphipoda species off Iceland.PMC8986549Lorz ANKaiser SOldeland JfalseNiche breadth and biodiversity change derived from marine Amphipoda species off Iceland.Understanding the ecological requirements and thresholds of individual species is crucial to better predict potential outcomes of climate change on species distribution. In particular, species optima and lower and upper limits along resource gradients require attention. Based on Huisman-Olff-Fresco (HOF) models, we determined species-specific responses along gradients of nine environmental parameters including depth in order to estimate niche attributes of 30 deep-sea benthic amphipods occurring around Iceland. We, furthermore, examined the relationships between niche breadth, occupancy, and geographic range assuming that species with a wider niche are spatially more widely dispersed and vice versa. Overall, our results reveal that species react very differently to environmental gradients,2022-01-01T00:00:00Z2022 Apr2025-04-04T22:16:33.817Z2025-04-04T22:16:33.817ZS-EPMC89865493541489410.1002/ece3.8802