INVESTIGADORES
LARA Ruben Jose
artículos
Título:
Tannin as an indicator of palaeomangrove in sediment cores from Amapá, Northern Brazil
Autor/es:
COHEN, MARCELO; GUIMARAES, J.T.F.; FRANCA, M.; LARA, RUBÉN JOSÉ
Revista:
WETLANDS ECOLOGY AND MANAGEMENT
Editorial:
Springer
Referencias:
Lugar: Berlin; Año: 2009 p. 145 - 155
ISSN:
0923-4861
Resumen:
<!--
/* Font Definitions */
@font-face
{font-family:ArialUnicodeMS;
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-alt:"Arial Unicode MS";
mso-font-charset:129;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:1 151388160 16 0 524288 0;}
@font-face
{font-family:"\@ArialUnicodeMS";
panose-1:0 0 0 0 0 0 0 0 0 0;
mso-font-charset:129;
mso-generic-font-family:auto;
mso-font-format:other;
mso-font-pitch:auto;
mso-font-signature:1 151388160 16 0 524288 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-parent:"";
margin:0cm;
margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:"Times New Roman";
mso-fareast-font-family:"Times New Roman";}
@page Section1
{size:612.0pt 792.0pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;
mso-header-margin:35.4pt;
mso-footer-margin:35.4pt;
mso-paper-source:0;}
div.Section1
{page:Section1;}
-->
Two
sediment cores sampled from a varzea (N 02º 34' 38", W 50º 53'17")
and mangrove area (N 02º 35' 59", W 50º 52' 08") in Amapá
littoral, northern Brazil,
were studied through pollen and spectrophotometric analysis in order to compare
biological and chemical signals of mangrove vegetation recorded by sediments
during the late Holocene. According to the pollen study, probably the core base
(145 - 65 cm) of varzea vegetation accumulated sediments devoid of vegetation.
Later, this site was dominated by herbaceous vegetation and it concluded with a
varzea forest. Based on spectrophotometric analysis, this core did not present
significant tannin concentrations. This is likely due to the mangrove absence
during the vegetation development at this site. The core sampled from a
mangrove area also presented a relationship between palaeovegetation and the
sediment biogeochemistry. However, the mangrove core presented significant
tannin content along the mangrove phases. Thus, this spectrophotometric method supported
by the pollen data may be considered as a complementary tool to identify palaeomangrove
deposits.
