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Shaping the Latitudinal Diversity Gradient: New Perspectives from a Synthesis of Paleobiology and Biogeography.
Am Nat. 2017 Jan; 189(1):1-12.AN

Abstract

An impediment to understanding the origin and dynamics of the latitudinal diversity gradient (LDG)-the most pervasive large-scale biotic pattern on Earth-has been the tendency to focus narrowly on a single causal factor when a more synthetic, integrative approach is needed. Using marine bivalves as a model system and drawing on other systems where possible, we review paleobiologic and biogeographic support for two supposedly opposing views, that the LDG is shaped primarily by (a) local environmental factors that determine the number of species and higher taxa at a given latitude (in situ hypotheses) or (b) the entry of lineages arising elsewhere into a focal region (spatial dynamics hypotheses). Support for in situ hypotheses includes the fit of present-day diversity trends in many clades to such environmental factors as temperature and the correlation of extinction intensities in Pliocene bivalve faunas with net regional temperature changes. Support for spatial dynamics hypotheses includes the age-frequency distribution of bivalve genera across latitudes, which is consistent with an out-of-the-tropics dynamic, as are the higher species diversities in temperate southeastern Australia and southeastern Japan than in the tropical Caribbean. Thus, both in situ and spatial dynamics processes must shape the bivalve LDG and are likely to operate in other groups as well. The relative strengths of the two processes may differ among groups showing similar LDGs, but dissecting their effects will require improved methods of integrating fossil data with molecular phylogenies. We highlight several potential research directions and argue that many of the most dramatic biotic patterns, past and present, are likely to have been generated by diverse, mutually reinforcing drivers.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

28035884

Citation

Jablonski, David, et al. "Shaping the Latitudinal Diversity Gradient: New Perspectives From a Synthesis of Paleobiology and Biogeography." The American Naturalist, vol. 189, no. 1, 2017, pp. 1-12.
Jablonski D, Huang S, Roy K, et al. Shaping the Latitudinal Diversity Gradient: New Perspectives from a Synthesis of Paleobiology and Biogeography. Am Nat. 2017;189(1):1-12.
Jablonski, D., Huang, S., Roy, K., & Valentine, J. W. (2017). Shaping the Latitudinal Diversity Gradient: New Perspectives from a Synthesis of Paleobiology and Biogeography. The American Naturalist, 189(1), 1-12. https://doi.org/10.1086/689739
Jablonski D, et al. Shaping the Latitudinal Diversity Gradient: New Perspectives From a Synthesis of Paleobiology and Biogeography. Am Nat. 2017;189(1):1-12. PubMed PMID: 28035884.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Shaping the Latitudinal Diversity Gradient: New Perspectives from a Synthesis of Paleobiology and Biogeography. AU - Jablonski,David, AU - Huang,Shan, AU - Roy,Kaustuv, AU - Valentine,James W, Y1 - 2016/12/02/ PY - 2016/12/31/entrez PY - 2016/12/31/pubmed PY - 2017/12/5/medline KW - extinction KW - geographic range dynamics KW - historical biogeography KW - paleobiology KW - phylogeny KW - speciation SP - 1 EP - 12 JF - The American naturalist JO - Am Nat VL - 189 IS - 1 N2 - An impediment to understanding the origin and dynamics of the latitudinal diversity gradient (LDG)-the most pervasive large-scale biotic pattern on Earth-has been the tendency to focus narrowly on a single causal factor when a more synthetic, integrative approach is needed. Using marine bivalves as a model system and drawing on other systems where possible, we review paleobiologic and biogeographic support for two supposedly opposing views, that the LDG is shaped primarily by (a) local environmental factors that determine the number of species and higher taxa at a given latitude (in situ hypotheses) or (b) the entry of lineages arising elsewhere into a focal region (spatial dynamics hypotheses). Support for in situ hypotheses includes the fit of present-day diversity trends in many clades to such environmental factors as temperature and the correlation of extinction intensities in Pliocene bivalve faunas with net regional temperature changes. Support for spatial dynamics hypotheses includes the age-frequency distribution of bivalve genera across latitudes, which is consistent with an out-of-the-tropics dynamic, as are the higher species diversities in temperate southeastern Australia and southeastern Japan than in the tropical Caribbean. Thus, both in situ and spatial dynamics processes must shape the bivalve LDG and are likely to operate in other groups as well. The relative strengths of the two processes may differ among groups showing similar LDGs, but dissecting their effects will require improved methods of integrating fossil data with molecular phylogenies. We highlight several potential research directions and argue that many of the most dramatic biotic patterns, past and present, are likely to have been generated by diverse, mutually reinforcing drivers. SN - 1537-5323 UR - https://www.unboundmedicine.com/medline/citation/28035884/Shaping_the_Latitudinal_Diversity_Gradient:_New_Perspectives_from_a_Synthesis_of_Paleobiology_and_Biogeography_ L2 - https://doi.org/10.1086/689739 DB - PRIME DP - Unbound Medicine ER -