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Pleistocene sea-level changes as a predictor for insular species richness?
|Authors:||Rijsdijk, K.F.; Norder, Sietze; Otto, Rudy; Emerson, Brent C. ; Loon, E. Emiel van; Warren, Ben H.; Tjørve, Even; Ávila, Sergio P.; Triantis, Kostas A.; Whittaker, Robert J.; Thébaud, Christophe; Hengl, Tom; Florens, Vincent; Gerlach, Justin; Hooghiemstra, H.; de Boer, E.J. ; Baider, Claudia; Oostermeijer, Gerard; Schilthuizen, Meno; Fernández-Palacios, José María; Griffiths, Owen|
|Citation:||Island Biology 2014|
|Abstract:||Pleistocene sea level change significantly altered surface areas and degree of isolation of oceanic islands. Sea level falls during glacial periods led to increase of surface areas, emergence of guyots and a between islands within archipelagos was well as the distance to nearby continents, whereas interglacial sea level rises led to opposite effects. We test the hypothesis that the dynamics of such changes explains at least partly present day species richness. To this end we modelled the effect of sea level change for one glacial-interglacial cycle and derived unique metrics for each of 68 islands that describe maximum palaeo-area (pA), surface-area change(AC), maximum palaeo-distance and distance change. We then used these metrics along with present area, present distance, present altitude and island age as predictors for present-day gastropod richness in linear mixed models. We found when including continental oceanic islands (Seychelles) in our data set that pA and AC are significant predictors for species richness for nearly all chorological classes. When excluding the Seychelles we found pA remains the only significant predictor for endemic richness. In addition we found for the Canarian islands that islands that were formerly merged share significantly more species and multiple endemics than islands that had remained separated. We conclude that changes in the configuration f islands and archipelagos through time likely play a key role in determining current species richness through its influence on the ecological and evolutionary processes underlying community dynamics.|
|Description:||Trabajo presentado en el el congreso Island Biology 2014 celebrado en Hawai del 7 al 11 de julio de 2014.|
|Appears in Collections:||(IPNA) Comunicaciones congresos|