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Nudibranchs were identified and counted approximately monthly at 2 INT and 4 FC sites along shallow transects, recording a total of 47 species. At INT, 28 species were recorded, with a mean monthly species richness ranging from 2.2 to 5.2 species, while FC had 42 species (6.0-12.2 species). Species richness was highest in autumn-winter in both habitats. Overall nudibranch abundance peaked in autumn at both habitats, largely due to mass occurrences of spawning ephemeral species. Multivariate analyses revealed a clear significant difference in assemblage structure between habitats, with season being a key factor in variability, particularly at FC sites. Species abundance patterns fell broadly into 2 main phenology groups: Group A, consisting of taxa with a defined peak in abundance in autumn-winter (INT: 6 taxa, FC: 11 taxa) and Group B, peaking in summer (INT: 0, FC: 6). Remaining species were assigned to Group C, an ad hoc residual category comprising taxa with ambiguous patterns, or species found in densities too low to allow for reliable pattern detection (INT: 23, FC: 27). This study provides insights into the composition and seasonal dynamics of sub-Arctic nudibranch assemblages for the first time, highlighting notable habitat differences and strong seasonal variability. These findings underscore the importance of long-term monitoring in marine biodiversity studies, especially in regions with poorly understood taxa.<\/jats:p>","DOI":"10.3354\/meps15211","type":"journal-article","created":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T11:47:16Z","timestamp":1780314436000},"page":"1-17","update-policy":"https:\/\/doi.org\/10.3354\/policy","source":"Crossref","is-referenced-by-count":0,"title":["Sub-Arctic coastal nudibranch (Mollusca, Gastropoda) assemblages vary distinctly with habitat and season"],"prefix":"10.3354","volume":"787","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5742-4993","authenticated-orcid":true,"given":"Fredrik","family":"Broms","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul E.","family":"Renaud","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5188-7305","authenticated-orcid":true,"given":"Torkild","family":"Bakken","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jussi","family":"Evertsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4584-7796","authenticated-orcid":true,"given":"Bodil A.","family":"Bluhm","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1913","published-online":{"date-parts":[[2026,6,11]]},"reference":[{"key":"Ref1","doi-asserted-by":"publisher","DOI":"10.1093\/mollus\/60.2.129"},{"key":"Ref2","doi-asserted-by":"publisher","DOI":"10.1007\/BF02112130"},{"key":"Ref3","unstructured":"Artsdatabanken (2026) Data for Dendronotus elegans A. 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