Influence of past archipelago configuration on present-day insular biodiversity patterns

  1. Norder, Sietze Johannes
  2. Proios, Kostas V
  3. Whittaker, Robert J
  4. Alonso, María R
  5. Borges, Paulo A V
  6. Borregaard, Michael K
  7. Cowie, Robert H
  8. Florens, F B Vincent
  9. de Frias Martins, António M
  10. Ibáñez, Miguel
  11. Kissling, W Daniel
  12. de Nascimento, Lea
  13. Otto, Rüdiger
  14. Parent, Christine E
  15. Rigal, François
  16. Warren, Ben H
  17. Fernández-Palacios, José María
  18. van Loon, E Emiel
  19. Triantis, Kostas A
  20. Rijsdijk, Kenneth F

Editor: PANGAEA

Ano de publicación: 2018

Tipo: Dataset

CC BY 3.0

DOI: 10.1594/PANGAEA.893265 lock_openAcceso aberto editor

Resumo

Aim: To quantify the influence of past archipelago configuration on present-day insular biodiversity patterns, and to compare the role of long-lasting archipelago configurations over the Pleistocene to configurations of short duration such as at the Last Glacial Maximum (LGM) and the present-day. Location: 53 volcanic oceanic islands from 12 archipelagos worldwide - Azores, Canary Islands, Cook Islands, Galápagos, Gulf of Guinea, Hawaii, Madeira, Mascarenes, Pitcairn, Revillagigedo, Samoan Islands, and Tristan da Cunha. Time period: The last 800 Kyr, representing the nine most recent glacial-interglacial cycles. Major taxa studied: Land snails and angiosperms. Methods: Species richness data for land snails and angiosperms were compiled from existing literature and species checklists. We reconstructed archipelago configurations at the following sea-levels: the present-day high interglacial sea-level, the intermediate sea-levels that are representative of the Pleistocene, and the low sea-levels of the LGM. We fitted two alternative linear mixed models for each archipelago configuration on the number of single-island endemic, multiple-island endemic, and native non-endemic species. Model performance was assessed based on the goodness-of-fit of the full model, the variance explained by archipelago configuration, and model parsimony. Results: Single-island endemic richness in both taxonomic groups was best explained by intermediate palaeo-configuration (positively by area change, and negatively by palaeo-connectedness), whereas non-endemic native species richness was poorly explained by palaeo-configuration. Single-island endemic richness was better explained by intermediate archipelago configurations than by the archipelago configurations of the LGM or present-day. Main conclusions: Archipelago configurations at intermediate sea-levels - which are representative of the Pleistocene - have left a stronger imprint on single-island endemic richness patterns on volcanic oceanic islands than extreme archipelago configurations that persisted for only a few thousand years (such as the LGM). In understanding ecological and evolutionary dynamics of insular biota it is essential to consider longer-lasting environmental conditions, rather than extreme situations alone.

Referencias bibliográficas

  • 10.1594/pangaea.880585
  • 10.1111/geb.12715