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Despite their great size, abyssal plains extend across modest environmental gradients compared to other marine ecosystems. However, little is known about the patterns and processes regulating biodiversity or potentially delimiting biogeographical boundaries at regional scales in the abyss. Improved macroecological understanding of remote abyssal environments is urgent as threats of widespread anthropogenic disturbance grow in the deep ocean. Here, we use a new, basin-scale dataset to show the existence of clear regional zonation in abyssal communities across the 5,000\u2009km span of the Clarion\u2013Clipperton Zone (northeast Pacific), an area targeted for deep-sea mining. We found two pronounced biogeographic provinces, deep and shallow-abyssal, separated by a transition zone between 4,300 and 4,800\u2009m depth. Surprisingly, species richness was maintained across this boundary by phylum-level taxonomic replacements. These regional transitions are probably related to calcium carbonate saturation boundaries as taxa dependent on calcium carbonate structures, such as shelled molluscs, appear restricted to the shallower province. Our results suggest geochemical and climatic forcing on distributions of abyssal populations over large spatial scales and provide a potential paradigm for deep-sea macroecology, opening a new basis for regional-scale biodiversity research and conservation strategies in Earth\u2019s largest biome.<\/jats:p>","DOI":"10.1038\/s41559-023-02122-9","type":"journal-article","created":{"date-parts":[[2023,7,24]],"date-time":"2023-07-24T16:01:51Z","timestamp":1690214511000},"page":"1388-1397","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Carbonate compensation depth drives abyssal biogeography in the northeast Pacific"],"prefix":"10.1038","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9667-2917","authenticated-orcid":false,"given":"Erik","family":"Simon-Lled\u00f3","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3044-107X","authenticated-orcid":false,"given":"Diva J.","family":"Amon","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8163-8724","authenticated-orcid":false,"given":"Guadalupe","family":"Bribiesca\u2010Contreras","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4042-8215","authenticated-orcid":false,"given":"Daphne","family":"Cuvelier","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6529-9109","authenticated-orcid":false,"given":"Jennifer M.","family":"Durden","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8714-4696","authenticated-orcid":false,"given":"Sofia P.","family":"Ramalho","sequence":"additional","affiliation":[]},{"given":"Katja","family":"Uhlenkott","sequence":"additional","affiliation":[]},{"given":"Pedro Martinez","family":"Arbizu","sequence":"additional","affiliation":[]},{"given":"No\u00eblie","family":"Benoist","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3333-4325","authenticated-orcid":false,"given":"Jonathan","family":"Copley","sequence":"additional","affiliation":[]},{"given":"Thomas G.","family":"Dahlgren","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9489-074X","authenticated-orcid":false,"given":"Adrian G.","family":"Glover","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6608-2841","authenticated-orcid":false,"given":"Bethany","family":"Fleming","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4250-1068","authenticated-orcid":false,"given":"Tammy","family":"Horton","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3479-6652","authenticated-orcid":false,"given":"Se-Jong","family":"Ju","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6154-8809","authenticated-orcid":false,"given":"Alejandra","family":"Mej\u00eda-Saenz","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0395-8332","authenticated-orcid":false,"given":"Kirsty","family":"McQuaid","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2881-8341","authenticated-orcid":false,"given":"Ellen","family":"Pape","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2477-5129","authenticated-orcid":false,"given":"Chailinn","family":"Park","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3976-0889","authenticated-orcid":false,"given":"Craig R.","family":"Smith","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5218-1649","authenticated-orcid":false,"given":"Daniel O. 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