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Global warming is causing a more pronounced dip in marine species richness around the equator

Proceedings of the National Academy of Sciences - PNAS, 2021-04, Vol.118 (15), p.e2015094118 [Peer Reviewed Journal]

Copyright National Academy of Sciences Apr 13, 2021 ;2021 ;ISSN: 0027-8424 ;EISSN: 1091-6490 ;DOI: 10.1073/pnas.2015094118 ;PMID: 33876750

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  • Title:
    Global warming is causing a more pronounced dip in marine species richness around the equator
  • Author: Chaudhary, Chhaya ; Richardson, Anthony J ; Schoeman, David S ; Costello, Mark J
  • Subjects: Animal species ; Biodiversity ; Biological Sciences ; Climate change ; Equator ; Global warming ; Marine animals ; Northern Hemisphere ; Population decline ; Sea surface temperature ; Species richness ; Tropical environments
  • Is Part Of: Proceedings of the National Academy of Sciences - PNAS, 2021-04, Vol.118 (15), p.e2015094118
  • Description: The latitudinal gradient in species richness, with more species in the tropics and richness declining with latitude, is widely known and has been assumed to be stable over recent centuries. We analyzed data on 48,661 marine animal species since 1955, accounting for sampling variation, to assess whether the global latitudinal gradient in species richness is being impacted by climate change. We confirm recent studies that show a slight dip in species richness at the equator. Moreover, richness across latitudinal bands was sensitive to temperature, reaching a plateau or declining above a mean annual sea surface temperature of 20 °C for most taxa. In response, since the 1970s, species richness has declined at the equator relative to an increase at midlatitudes and has shifted north in the northern hemisphere, particularly among pelagic species. This pattern is consistent with the hypothesis that climate change is impacting the latitudinal gradient in marine biodiversity at a global scale. The intensification of the dip in species richness at the equator, especially for pelagic species, suggests that it is already too warm there for some species to survive.
  • Publisher: United States: National Academy of Sciences
  • Language: English
  • Identifier: ISSN: 0027-8424
    EISSN: 1091-6490
    DOI: 10.1073/pnas.2015094118
    PMID: 33876750
  • Source: GFMER Free Medical Journals
    PubMed Central

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