A proposed Pleistocene/Holocene lake in the Amazon basin and its significance to Amazonian geology and biogeography

Frailey, Carl D.; Lavina, Ernesto Luiz Corrêa; Rancy, Alceu; Filho, Jonás Pereira de Souza

doi:10.1590/1809-43921988183143

Cited by 79 publications

(68 citation statements)

References 6 publications

(6 reference statements)

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“…A variant of the Lagoon model envisions flooding of large parts of Amazonia to even more than 200 m above present sealevel ("Lake Amazonas"), when an Andean paleolake drained catastrophically 45,000 to 40,000 years ago (Frailey et al, 1988, Campbell, 1990. These authors assumed a dam near the mouth of the Amazon River supposedly consisting of Belterra clay that prevented the floodwaters from rapidly emptying into the Atlantic Ocean.…”

Section: Lagoon Model or Lake Modelmentioning

confidence: 99%

Hypotheses to explain the origin of species in Amazonia

Haffer¹

2008

Braz. J. Biol.

187

171

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The main hypotheses proposed to explain barrier formation separating populations and causing the differentiation of species in Amazonia during the course of geological history are based on different factors, as follow: (1) Changes in the distribution of land and sea or in the landscape due to tectonic movements or sea level fluctuations (Paleogeography hypothesis), (2) the barrier effect of Amazonian rivers (River hypothesis), (3) a combination of the barrier effect of broad rivers and vegetational changes in northern and southern Amazonia (River-refuge hypothesis), (4) the isolation of humid rainforest blocks near areas of surface relief in the periphery of Amazonia separated by dry forests, savannas and other intermediate vegetation types during dry climatic periods of the Tertiary and Quaternary (Refuge hypothesis), (5) changes in canopy-density due to climatic reversals (Canopy-density hypothesis) (6) the isolation and speciation of animal populations in small montane habitat pockets around Amazonia due to climatic fluctuations without major vegetational changes (Museum hypothesis), (7) competitive species interactions and local species isolations in peripheral regions of Amazonia due to invasion and counterinvasion during cold/warm periods of the Pleistocene (Disturbance-vicariance hypothesis) and (8) parapatric speciation across steep environmental gradients without separation of the respective populations (Gradient hypothesis). Several of these hypotheses probably are relevant to a different degree for the speciation processes in different faunal groups or during different geological periods. The basic paleogeography model refers mainly to faunal differentiation during the Tertiary and in combination with the Refuge hypothesis. Milankovitch ‡ cycles leading to global main hypotheses proposed to explain barrier formation separating populations and causing the differentiation of species in Amazonia during the course of geological history are based on different factors, as follow: (1) Changes in the distribution of land and sea or in the landscape due to tectonic movements or sea level fluctuations (Paleogeography hypothesis), (2) the barrier effect of Amazonian rivers (River hypothesis), (3) a combination of the barrier effect of broad rivers and vegetational changes in northern and southern Amazonia (River-refuge hypothesis), (4) the isolation of humid rainforest blocks near areas of surface relief in the periphery of Amazonia separated by dry forests, savannas and other intermediate vegetation types during dry climatic periods of the Tertiary and Quaternary (Refuge hypothesis), (5) changes in canopy-density due to climatic reversals (Canopy-density hypothesis) (6) the isolation and speciation of animal populations in small montane habitat pockets around Amazonia due to climatic fluctuations without major vegetational changes (Museum hypothesis), (7) competitive species interactions and local species isolations in peripheral regions of Amazonia due to invasion and counterinvasion during cold/warm p...

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Section: Lagoon Model or Lake Modelmentioning

confidence: 99%

Hypotheses to explain the origin of species in Amazonia

Haffer¹

2008

Braz. J. Biol.

187

171

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“…The upper beds of the Solimòes Formation have been correlated by FRAILEY et al (1988) with the Inapari Formation (CAMPBELL & FRAILEY, 1984), of Holocene age in Peru. KRONBERG et al (1990; assigned a Late Pleistocene age for the Solimòes Fm.…”

Section: Geological Backgroundmentioning

confidence: 99%

Paleoenvironmental Model for the Late Cenozoic of Southwestern Amazonia: Paleontology and Geology

et al. 1997

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-Our study provides paleontological and geological data substantiating a paleoenvironmental model for the upper Miocene-Pliocene of Southwestern Amazonia. The extensive Late Tertiary sediments of The Solimões Formation, outcropping in Southwestern Amazonia, were deposited by a complex megafan system, originating in the high Peruvian Andes. The megafan system was the sedimentological response to the Andean Quechua tectonic phase of Tertiary age, producing sediments that fdled the foreland basin of Southwestern Amazonia. Occurrences of varied vertebrate fossil assemblages of the HuayquerianMontehermosan Mammal age collected in these sediments support this interpretation. The fauna includes several genera and species of fishes, reptiles, birds, mammals and appears to be one that could have lived in or near a riverine habitat. In the Late Pliocene, the megafan system became inactive as a result of the influence of the Diaguita Tectonical Phase.

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“…The endemism of frogs in this region is currently considered to be signiWcant, but low compared to the Andes and the Brazilian Atlantic forest (Duellman, 1999) because many frog species are believed to have large ranges in Amazonia as well as the Guianas. Main factors that are thought to have shaped genetic diversity in South America include geological and climatological historical events and changes in the distribution of forested areas (Frailey et al, 1989;HaVer, 1969HaVer, , 1990HaVer, , 1997Nores, 1999;Räsänen et al, 1991Räsänen et al, , 1990. On a broad scale, French Guiana might be on a borderline segregating east and west assemblages of plants (De Granville, 1982), Wshes (Boujard et al, 1997;Jegu and Keith, 1999) and frogs (Lescure and Marty, 2000).…”

Section: Introductionmentioning

confidence: 99%

Revealing cryptic diversity using molecular phylogenetics and phylogeography in frogs of the Scinax ruber and Rhinella margaritifera species groups

Fouquet

Vences

Salducci³

et al. 2007

Molecular Phylogenetics and Evolution

133

140

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Few studies to date have examined genetic variability of widespread tropical amphibian species over their distributional range using diVerent kinds of molecular markers. Here, we use genetic data in an attempt to delimit evolutionary entities within two groups of Neotropical frogs, the Scinax ruber species group and the Rhinella margaritifera species group. We combined mitochondrial and nuclear markers for a phylogenetic (a total of »2500 bp) and phylogeographic study (»1300 bp) to test the reliability of the currently accepted taxonomic assignments and to explore the geographic structure of their genetic variation, mainly based upon samples from the French Guianan region. Phylogenetic analyses demonstrated the polyphyly of Scinax ruber and Rhinella margaritifera. S. ruber consists of six lineages that may all merit species status. ConXicting signals of mitochondrial and nuclear markers indicated, among some Scinax lineages and species, the possibility of ongoing hybridization processes. R. margaritifera consisted of 11 lineages which might represent distinct species as well. Phylogeographic analyses added further information in support of the speciWc status of these lineages. Lineages of low divergence were found in sympatry and were reciprocally monophyletic for mitochondrial as well as nuclear genes, indicating the existence of young lineages that should be awarded species status. Our results highlight the utility of combining phylogenetic and phylogeographic methods, as well as the use of both mitochondrial and nuclear markers within one study. This approach helped to better understand the evolutionary history of taxonomically complex groups of species. The assessment of the geographic distribution of genetic diversity in tropical amphibian communities can lead to conclusions that diVer strongly from prior analyses based on the occurrence of currently recognized species alone. Such studies, therefore, hold the potential to contribute to a more objective assessment of amphibian conservation priorities in tropical areas.

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A proposed Pleistocene/Holocene lake in the Amazon basin and its significance to Amazonian geology and biogeography

Abstract: SUMMARY

Cited by 79 publications

References 6 publications

Hypotheses to explain the origin of species in Amazonia

Hypotheses to explain the origin of species in Amazonia

Paleoenvironmental Model for the Late Cenozoic of Southwestern Amazonia: Paleontology and Geology

Revealing cryptic diversity using molecular phylogenetics and phylogeography in frogs of the Scinax ruber and Rhinella margaritifera species groups

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