6 research outputs found
Landscape dynamics and diversification of the megadiverse South American freshwater fish fauna
Landscape dynamics are widely thought to govern the tempo and mode of continental radiations, yet the effects of river network rearrangements on dispersal and lineage diversification remain poorly understood. We integrated an unprecedented occurrence dataset of 4,967 species with a newly compiled, time-calibrated phylogeny of South American freshwater fishesâthe most species-rich continental vertebrate fauna on Earthâto track the evolutionary processes associated with hydrogeographic events over 100 Ma. Net lineage diversification was heterogeneous through time, across space, and among clades. Five abrupt shifts in net diversification rates occurred during the Paleogene and Miocene (between 30 and 7 Ma) in association with major landscape evolution events. Net diversification accelerated from the Miocene to the Recent (c. 20 to 0 Ma), with Western Amazonia having the highest rates of in situ diversification, which led to it being an important source of species dispersing to other regions. All regional biotic interchanges were associated with documented hydrogeographic events and the formation of biogeographic corridors, including the Early Miocene (c. 23 to 16 Ma) uplift of the Serra do Mar and Serra da Mantiqueira and the Late Miocene (c. 10 Ma) uplift of the Northern Andes and associated formation of the modern transcontinental Amazon River. The combination of high diversification rates and extensive biotic interchange associated with Western Amazonia yielded its extraordinary contemporary richness and phylogenetic endemism. Our results support the hypothesis that landscape dynamics, which shaped the history of drainage basin connections, strongly affected the assembly and diversification of basin-wide fish fauna
Cobertura vacinal e fatores associados ao esquema vacinal bĂĄsico incompleto aos 12 meses de idade, SĂŁo LuĂs, MaranhĂŁo, Brasil, 2006
Author Correction: Low vector competence in sylvatic mosquitoes limits Zika virus to initiate an enzootic cycle in South America
An amendment to this paper has been published and can be accessed via a link at the top of the paper
Landscape dynamics and diversification of the megadiverse South American freshwater fish fauna
Landscape dynamics are widely thought to govern the tempo and mode of continental
radiations, yet the effects of river network rearrangements on dispersal and lineage diver-
sification remain poorly understood. We integrated an unprecedented occurrence dataset
of 4,967 species with a newly compiled, time-calibrated phylogeny of South American
freshwater fishesâthe most species-rich continental vertebrate fauna on Earthâto
track the evolutionary processes associated with hydrogeographic events over 100 Ma.
Net lineage diversification was heterogeneous through time, across space, and among
clades. Five abrupt shifts in net diversification rates occurred during the Paleogene and
Miocene (between 30 and 7 Ma) in association with major landscape evolution events.
Net diversification accelerated from the Miocene to the Recent (c. 20 to 0 Ma), with
Western Amazonia having the highest rates of in situ diversification, which led to it
being an important source of species dispersing to other regions. All regional biotic
interchanges were associated with documented hydrogeographic events and the forma-
tion of biogeographic corridors, including the Early Miocene (c. 23 to 16 Ma) uplift of
the Serra do Mar and Serra da Mantiqueira and the Late Miocene (c. 10 Ma) uplift of
the Northern Andes and associated formation of the modern transcontinental Amazon
River. The combination of high diversification rates and extensive biotic interchange
associated with Western Amazonia yielded its extraordinary contemporary richness and
phylogenetic endemism. Our results support the hypothesis that landscape dynamics,
which shaped the history of drainage basin connections, strongly affected the assembly
and diversification of basin-wide fish faunas.Instituto de CiĂȘncias BiolĂłgicas (IB)Departamento de Ecologia (IB ECL