The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America
The flora of the Guiana Shield contains several plant lineages that are restricted to white-sand vegetation, some of which are widespread in tropical South America. Here, the history of diversification of one of these lineages, the genus Pagamea (Rubiaceae), is reconstructed through phylogenetic hyp...
| Autor principal: | Vicentini, Alberto |
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| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Biotropica
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/17404 |
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oai:repositorio:1-17404 |
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oai:repositorio:1-17404 The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America Vicentini, Alberto Climate Variation Evolutionary Biology Genetic Marker Habitat Structure Herb Morphology Phylogeny Pleistocene Reconstruction Speciation (biology) Tropical Region Amazon River Andes Guyana Shield Pagamea Rubiaceae The flora of the Guiana Shield contains several plant lineages that are restricted to white-sand vegetation, some of which are widespread in tropical South America. Here, the history of diversification of one of these lineages, the genus Pagamea (Rubiaceae), is reconstructed through phylogenetic hypotheses. Data from chloroplast (rps16 and rpl20-rps12) and nuclear (ITS) markers were incongruent, with ITS found to be more consistent with morphological criteria to delimit species. Reconstruction of the ancestral area for the genus was ambiguous, with both the western Guiana Shield and the Atlantic coastal areas containing early divergent lineages, but most speciation events appeared to have happened in the western Guiana Shield where most extant diversity is present. Dispersal events into the western Amazon and the Andes (1.5-4.5 Ma) and the eastern Guiana Shield (0.4-2.2 Ma) were followed by speciation events in these regions. Dispersal events between the Amazon and Atlantic rain forest occurred at least three times independently. However, dispersals into new areas were limited, and most regions were found to be phylogenetically clustered. Altitudinal and habitat shifts happened multiple times independently, but ecological traits were found to be phylogenetically conserved, implying that such shifts were not the cause of lineage divergence. The result that most speciation events happened in the western Guiana Shield, where white-sand habitats predominate in both lowlands and highlands, and which has been less affected by Pleistocene climatic change, coupled with the result that ecological traits are phylogenetically conserved, suggests that the diversification of Pagamea may have been related primarily to the patchy distribution of white-sand vegetation. © 2016 The Association for Tropical Biology and Conservation. 2020-06-15T21:42:17Z 2020-06-15T21:42:17Z 2016 Artigo https://repositorio.inpa.gov.br/handle/1/17404 10.1111/btp.12295 en Volume 48, Número 1, Pags. 58-69 Restrito Biotropica |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Climate Variation Evolutionary Biology Genetic Marker Habitat Structure Herb Morphology Phylogeny Pleistocene Reconstruction Speciation (biology) Tropical Region Amazon River Andes Guyana Shield Pagamea Rubiaceae |
| spellingShingle |
Climate Variation Evolutionary Biology Genetic Marker Habitat Structure Herb Morphology Phylogeny Pleistocene Reconstruction Speciation (biology) Tropical Region Amazon River Andes Guyana Shield Pagamea Rubiaceae Vicentini, Alberto The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America |
| topic_facet |
Climate Variation Evolutionary Biology Genetic Marker Habitat Structure Herb Morphology Phylogeny Pleistocene Reconstruction Speciation (biology) Tropical Region Amazon River Andes Guyana Shield Pagamea Rubiaceae |
| description |
The flora of the Guiana Shield contains several plant lineages that are restricted to white-sand vegetation, some of which are widespread in tropical South America. Here, the history of diversification of one of these lineages, the genus Pagamea (Rubiaceae), is reconstructed through phylogenetic hypotheses. Data from chloroplast (rps16 and rpl20-rps12) and nuclear (ITS) markers were incongruent, with ITS found to be more consistent with morphological criteria to delimit species. Reconstruction of the ancestral area for the genus was ambiguous, with both the western Guiana Shield and the Atlantic coastal areas containing early divergent lineages, but most speciation events appeared to have happened in the western Guiana Shield where most extant diversity is present. Dispersal events into the western Amazon and the Andes (1.5-4.5 Ma) and the eastern Guiana Shield (0.4-2.2 Ma) were followed by speciation events in these regions. Dispersal events between the Amazon and Atlantic rain forest occurred at least three times independently. However, dispersals into new areas were limited, and most regions were found to be phylogenetically clustered. Altitudinal and habitat shifts happened multiple times independently, but ecological traits were found to be phylogenetically conserved, implying that such shifts were not the cause of lineage divergence. The result that most speciation events happened in the western Guiana Shield, where white-sand habitats predominate in both lowlands and highlands, and which has been less affected by Pleistocene climatic change, coupled with the result that ecological traits are phylogenetically conserved, suggests that the diversification of Pagamea may have been related primarily to the patchy distribution of white-sand vegetation. © 2016 The Association for Tropical Biology and Conservation. |
| format |
Artigo |
| author |
Vicentini, Alberto |
| title |
The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America |
| title_short |
The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America |
| title_full |
The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America |
| title_fullStr |
The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America |
| title_full_unstemmed |
The Evolutionary History of Pagamea (Rubiaceae), a White-sand Specialist Lineage in Tropical South America |
| title_sort |
evolutionary history of pagamea (rubiaceae), a white-sand specialist lineage in tropical south america |
| publisher |
Biotropica |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/17404 |
| _version_ |
1787143556884856832 |
| score |
11.755432 |