Holocene coastal vegetation changes at the mouth of the Amazon River
Clarisse Beltrão Smith
Marcelo Cancela Lisboa Cohen
Luiz Carlos Ruiz Pessenda
Marlon Carlos França
José Tasso Felix Guimarães
Dilce de Fátima Rossetti
Rubén José Lara
Abstract
Wetland dynamics in the eastern Amazon region during the past 7000 years were studied using pollen, textural and structural analyses of sediment cores, as well as AMS radiocarbon dating. Four sediment cores were sampled from Marajó Island, which is located at the mouth of the Amazon River. Marajó Island is covered mainly by Amazon coastal forest, as well as herbaceous and varzea vegetation. Three cores were sampled from Lake Arari, which is surrounded by herbaceous vegetation flooded by freshwater. One core was sampled from a herbaceous plain located 15 km southeast of Lake Arari. Pollen preservation in the sedimentary deposits from this lake and from its drainage basin suggests significant vegetation changes on Marajó Island during the mid- and late-Holocene. Between 7328–7168 and 2306–2234 cal. yr BP, mangrove vegetation was more widely distributed on the island than it is today. During the past 2306–2234 cal. yr BP herbaceous vegetation expanded. Sedimentary structures and pollen data suggest a lagoon system until ~ 2300 cal. yr BP. The current distribution of mangroves along the Pará littoral, together with the presence of mangrove pollen and the sedimentary structures of the cores, indicates greater marine influence during the mid-Holocene. This may be attributed to the association between the eustatic sea-level change and the dry period recorded in Amazonia during the early- and mid-Holocene, followed by a wet phase over the past 2000 years.
Smith C.B., Cohen M.C.L., Pessenda L.C.R., França M.C., Guimarães J.T.F., Rossetti D.d.F. and Lara R.J. (2011) Holocene coastal vegetation changes at the mouth of the Amazon River. 168(1): 21-30. 10.1016/j.revpalbo.2011.09.008
@article{Smith2011,
Title = {Holocene coastal vegetation changes at the mouth of the Amazon River},
Author = {Smith, Clarisse Beltrão and Cohen, Marcelo Cancela Lisboa and Pessenda, Luiz Carlos Ruiz and França, Marlon Carlos and Guimarães, José Tasso Felix and Rossetti, Dilce de Fátima and Lara, Rubén José},
Editor = {},
Year = {2011},
Pages = {21-30},
Volume = {168},
Doi = {10.1016/j.revpalbo.2011.09.008},
Abstract = {Wetland dynamics in the eastern Amazon region during the past 7000 years were studied using pollen, textural and structural analyses of sediment cores, as well as AMS radiocarbon dating. Four sediment cores were sampled from Marajó Island, which is located at the mouth of the Amazon River. Marajó Island is covered mainly by Amazon coastal forest, as well as herbaceous and varzea vegetation. Three cores were sampled from Lake Arari, which is surrounded by herbaceous vegetation flooded by freshwater. One core was sampled from a herbaceous plain located 15 km southeast of Lake Arari. Pollen preservation in the sedimentary deposits from this lake and from its drainage basin suggests significant vegetation changes on Marajó Island during the mid- and late-Holocene. Between 7328–7168 and 2306–2234 cal. yr BP, mangrove vegetation was more widely distributed on the island than it is today. During the past 2306–2234 cal. yr BP herbaceous vegetation expanded. Sedimentary structures and pollen data suggest a lagoon system until ~ 2300 cal. yr BP. The current distribution of mangroves along the Pará littoral, together with the presence of mangrove pollen and the sedimentary structures of the cores, indicates greater marine influence during the mid-Holocene. This may be attributed to the association between the eustatic sea-level change and the dry period recorded in Amazonia during the early- and mid-Holocene, followed by a wet phase over the past 2000 years.},
}
TY - JOUR
AU - Smith, Clarisse Beltrão
AU - Cohen, Marcelo Cancela Lisboa
AU - Pessenda, Luiz Carlos Ruiz
AU - França, Marlon Carlos
AU - Guimarães, José Tasso Felix
AU - Rossetti, Dilce de Fátima
AU - Lara, Rubén José
TI - Holocene coastal vegetation changes at the mouth of the Amazon River
PY - 2011
SP - 21-30
VL - 168
DO - 10.1016/j.revpalbo.2011.09.008
AB - Wetland dynamics in the eastern Amazon region during the past 7000 years were studied using pollen, textural and structural analyses of sediment cores, as well as AMS radiocarbon dating. Four sediment cores were sampled from Marajó Island, which is located at the mouth of the Amazon River. Marajó Island is covered mainly by Amazon coastal forest, as well as herbaceous and varzea vegetation. Three cores were sampled from Lake Arari, which is surrounded by herbaceous vegetation flooded by freshwater. One core was sampled from a herbaceous plain located 15 km southeast of Lake Arari. Pollen preservation in the sedimentary deposits from this lake and from its drainage basin suggests significant vegetation changes on Marajó Island during the mid- and late-Holocene. Between 7328–7168 and 2306–2234 cal. yr BP, mangrove vegetation was more widely distributed on the island than it is today. During the past 2306–2234 cal. yr BP herbaceous vegetation expanded. Sedimentary structures and pollen data suggest a lagoon system until ~ 2300 cal. yr BP. The current distribution of mangroves along the Pará littoral, together with the presence of mangrove pollen and the sedimentary structures of the cores, indicates greater marine influence during the mid-Holocene. This may be attributed to the association between the eustatic sea-level change and the dry period recorded in Amazonia during the early- and mid-Holocene, followed by a wet phase over the past 2000 years.
ER -
