Norder, Sietze Johannes; Proios, Kostas V; Whittaker, Robert J; Alonso, María R; Borges, Paulo A V; Borregaard, Michael K; Cowie, Robert H; Florens, F B Vincent; de Frias Martins, António M; Ibáñez, Miguel; Kissling, W Daniel; de Nascimento, Lea; Otto, Rüdiger; Parent, Christine E; Rigal, François; Warren, Ben H; Fernández-Palacios, José María; van Loon, E Emiel; Triantis, Kostas A; Rijsdijk, Kenneth F (2018): Influence of past archipelago configuration on present-day insular biodiversity patterns. PANGAEA, https://doi.org/10.1594/PANGAEA.893265, Supplement to: Norder, SJ et al. (2018): Beyond the Last Glacial Maximum: Island endemism is best explained by long-lasting archipelago configurations. Global Ecology and Biogeography, https://doi.org/10.1111/geb.12835
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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.
Norder, Sietze Johannes; Baumgartner, John B; Borges, Paulo A V; Hengl, Tomislav; Kissling, W Daniel; van Loon, E Emiel; Rijsdijk, Kenneth F (2018): A global spatially explicit database of changes in island palaeo-area and archipelago configuration during the late Quaternary. Global Ecology and Biogeography, https://doi.org/10.1111/geb.12715
Median Latitude: 6.825830 * Median Longitude: -69.972946 * South-bound Latitude: -40.318810 * West-bound Longitude: -170.717620 * North-bound Latitude: 39.699100 * East-bound Longitude: 63.421350
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|1||Area/locality||Area||Norder, Sietze Johannes||Island|
|2||Area/locality||Area||Norder, Sietze Johannes||Archipelago|
|3||LATITUDE||Latitude||Norder, Sietze Johannes||Geocode|
|4||LONGITUDE||Longitude||Norder, Sietze Johannes||Geocode|
|5||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Single-island endemic|
|6||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Multiple-island endemic|
|7||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Native (non-endemic)|
|8||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Palaeo-island endemic at median sea-level|
|9||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Palaeo-island endemic at most frequent sea-level|
|10||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Palaeo-island endemic at a sea-level of -122m|
|11||Land snail species richness||Land snail S||#||Norder, Sietze Johannes||Palaeo-island endemic at glacial maximum sea-level|
|12||Angiosperm species richness||Angiosperm S||#||Norder, Sietze Johannes||Single-island endemic|
|13||Angiosperm species richness||Angiosperm S||#||Norder, Sietze Johannes||Native (non-endemic)|
|14||Angiosperm species richness||Angiosperm S||#||Norder, Sietze Johannes||Palaeo-island endemic at a sea-level of -122m|
|15||Distance||Distance||km||Norder, Sietze Johannes||Of current isolation|
|16||Number||No||Norder, Sietze Johannes||Palaeo-connectedness at median sea-level|
|17||Number||No||Norder, Sietze Johannes||Palaeo-connectedness at most frequent sea-level|
|18||Number||No||Norder, Sietze Johannes||Palaeo-connectedness at a sea-level of -122m|
|19||Number||No||Norder, Sietze Johannes||Palaeo-connectedness at glacial maximum sea-level|
|20||Log info||Log||Norder, Sietze Johannes||Log-transformed current area|
|21||Log info||Log||Norder, Sietze Johannes||Log-transformed area at median sea-level|
|22||Log info||Log||Norder, Sietze Johannes||Log-transformed area at most frequent sea-level|
|23||Log info||Log||Norder, Sietze Johannes||Log-transformed area at a sea-level of -122m|
|24||Log info||Log||Norder, Sietze Johannes||Log-transformed area at glacial maximum sea-level|
1166 data points