Chapter 17 Forests Diversity in the Mexican Neotropics: A Paleoecological View
Periodo de realización: 0001/01/01 al 2020/01/01
Tipo: Capítulo de libro
Resumen: "The forests of Mexico have conclusive environmental characteristics mainly shaped by geology and climate change. The western region is geologically linked to volcanic forcing, which in turn was responsible for mountain uplift while theeastwasformedbytectonicmovementinasteadyandgradualprocessallowing the development of rare taxa. These natural processes have produced dissimilarities in forest composition along the different regions of the Mexican territory. For the Holocene, palaeoclimatic and palaeoecological records have revealed that climate change is an essential factor involved in this diversification. Therefore, in order to discern differences in taxon diversity in tropical and temperate ecosystems during the Holocene, 15 sites with palaeoecological data retrieved from several sources (lakes,lagoons,ponds,amorainedepressionandforesthollows)werestudied.They comprisedhighlandandlowlandvegetationfrom0to3860maslrepresentinglocal and regional signals in mangrove forest, tropical evergreen forest, tropical subdeciduous forest, pine forest, pine-oak forest and cloud forests in different regions of Mexico. We used seven diversity metrics along with abundance estima- tion(Rarefaction,Pielouevenness,Shannondiversity,Hillnumbers:N0,N1andN2 and Rate of Change). Our results indicated that forests with a tropical component weremorediversethanforestswithHolarcticaffinities.Nonetheless,itwasnotclear iflocalsignalsweremorediversethanregionalsignalsorthatlowlandsignalswere more diverse than highland signals."