INVESTIGADORES
LARA Ruben Jose
artículos
Título:
Late Holocene mangrove dynamics of the Marajó Island, Amazônia, North Brazil
Autor/es:
BEHLING, HERMANN; COHEN, MARCELO; LARA, RUBÉN JOSÉ
Revista:
VEGETATION HISTORY AND ARCHAEOBOTANY
Editorial:
Springer
Referencias:
Lugar: Berlin; Año: 2004 p. 73 - 80
ISSN:
0939-6314
Resumen:
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Two sediment cores from the eastern coastal region of Marajó Island,
Pará State,
northern Brazil
have been studied by pollen analysis to reconstruct late Holocene mangrove
dynamics and environmental changes. Seven AMS radiocarbon dates provide time
control. Mangrove vegetation became established at the Barra Velha site at
about 2750 B.P. (2880 cal B.P.) and at the Praia do Pesqueiro site at about 650 B.P.
(670 cal B.P.). Rhizophora was the dominant mangrove tree throughout the recorded period, while Avicennia and Laguncularia were rare. Existing
remnants of the former coastal Amazon rain forest were replaced by mangrove in
the Barra Velha area between about 2750 and 740 B.P. (2880760 cal B.P.) and at
Praia do Pesqueiro area between about 650 and 530 B.P. (670540 cal B.P.), suggesting
a rise in relative sea level or, alternatively, an increase in discharge from
the river Amazon. Areas of coastal shrub and herb vegetation, the so-called restinga vegetation, also became
slightly reduced during the late Holocene. The largest area of mangrove at the
two sites suggests that the highest sea level was probably reached during the
last 200250 years. The only evidence of human activity at the two sites is an
indication of cattle pasture land at the Barra Velha area during the last decades.
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Two sediment cores from the eastern coastal region of Marajó Island,
Pará State,
northern Brazil
have been studied by pollen analysis to reconstruct late Holocene mangrove
dynamics and environmental changes. Seven AMS radiocarbon dates provide time
control. Mangrove vegetation became established at the Barra Velha site at
about 2750 B.P. (2880 cal B.P.) and at the Praia do Pesqueiro site at about 650 B.P.
(670 cal B.P.). Rhizophora was the dominant mangrove tree throughout the recorded period, while Avicennia and Laguncularia were rare. Existing
remnants of the former coastal Amazon rain forest were replaced by mangrove in
the Barra Velha area between about 2750 and 740 B.P. (2880760 cal B.P.) and at
Praia do Pesqueiro area between about 650 and 530 B.P. (670540 cal B.P.), suggesting
a rise in relative sea level or, alternatively, an increase in discharge from
the river Amazon. Areas of coastal shrub and herb vegetation, the so-called restinga vegetation, also became
slightly reduced during the late Holocene. The largest area of mangrove at the
two sites suggests that the highest sea level was probably reached during the
last 200250 years. The only evidence of human activity at the two sites is an
indication of cattle pasture land at the Barra Velha area during the last decades.