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A latitudinal diversity gradient of shallow-water gorgonians (Cnidaria: Octocorallia: Alcyonacea) along the Tropical Eastern Pacific Ocean: testing for underlying mechanisms

  • Mónica Núñez–FloresEmail author
  • Andrés Solórzano
  • Cristián E. Hernández
  • Pablo J. López–González
Original Paper

Abstract

One of the most pervasive patterns leading the distribution of life on Earth is the latitudinal diversity gradient (LDG). Considering its generality, understanding its main causes is critical to predicting climatically driven biodiversity loss. Here, we analyzed the LDG pattern in gorgonians (Octocorallia: Alcyonacea) in the Tropical Eastern Pacific Ocean (TEP), where they form a widespread, species-rich, and ecologically important group of marine benthic organisms. We compiled a database of the geographic occurrence of shallow-water (< 40 m depth) gorgonians with a range extent restricted to the TEP, in order to evaluate the shape of their LDG and to test different hypotheses that could explain these patterns (Rapoport’s and mid-domain effects), as well as the possible underlying mechanisms (source-sink dynamics and climatic variability hypothesis). The species richness showed a peak at 7–10° N with > 60 spp., declining toward the north and south. The gorgonians exhibit an increase of their distribution ranges at higher latitudes, supporting predictions of Rapoport’s effect, an effect rarely found in TEP marine faunas. This pattern is likely the result of a decrease of gorgonian temperature tolerances at lower latitudes. We highlight the existence of at least four gorgonian assemblages within the TEP exhibiting distinctive temperature adaptations, and a strong change in species composition with latitude. Our results indicate that sea temperature is an important factor shaping the distribution of gorgonians in the TEP, as in several other marine taxa.

Keywords

Biodiversity Rapoport’s effect Climatic variability hypothesis Mid-domain effect Source-sink dynamics 

Notes

Acknowledgments

We thank the editor Bert W. Hoeksema and the two anonymous reviewers for their comments and suggestions that greatly improved the final version of this manuscript.

Funding information

This study was funded by CONICYT–PCHA/Doctorado Nacional/2017–21170438 (NFM) and 2018–21180471 (AS), and FONDECYT–1170815 grant (CEH).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with animals performed by any of the authors.

Sampling and field studies

Not applicable.

Data availability

The data generated and analyzed during this study are included in the supplementary information files.

Supplementary material

12526_2019_1006_MOESM1_ESM.docx (32 kb)
ESM 1 (DOCX 22 kb)
12526_2019_1006_MOESM2_ESM.docx (58 kb)
ESM 2 (DOCX 30 kb)
12526_2019_1006_MOESM3_ESM.docx (200 kb)
ESM 3 (DOCX 200 kb)

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© Senckenberg Gesellschaft für Naturforschung 2019

Authors and Affiliations

  1. 1.Programa de Doctorado en Sistemática y Biodiversidad, Facultad de Ciencias Naturales y OceanográficasUniversidad de ConcepciónConcepciónChile
  2. 2.Programa de Doctorado en Biología Integrada, Facultad de BiologíaUniversidad de SevillaSevilleSpain
  3. 3.Programa de Doctorado en Ciencias Geológicas, Facultad de Ciencias QuímicasUniversidad de ConcepciónConcepciónChile
  4. 4.Laboratorio de Ecología Evolutiva y Filoinformática, Departamento de Zoología, Facultad de Ciencias Naturales y OceanográficasUniversidad de ConcepciónConcepciónChile
  5. 5.Biodiversidad y Ecología Acuática, Departamento de Zoología, Facultad de BiologíaUniversidad de SevillaSevilleSpain

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