부산대학교 도서관

Predictions of the effects of modern Relative Sea-Level (RSL) rise on mangroves should be based on decadal-millennial mangrove dynamics and the particularities of each depositional environment under past RSL changes. This work identified inland and seaward mangrove migrations along the Ceará-Mirim estuary (Rio Grande do Norte, northeastern Brazil) during the mid–late Holocene and Anthropocene based on sedimentary features, palynological, and geochemical (δ[sup.13]C, δ[sup.15]N, C/N) data integrated with spatial-temporal analysis based on satellite images. The data indicated three phases for the mangrove development: (1°) mangrove expansion on tidal flats with estuarine organic matter between >4420 and ~2870 cal yrs BP, under the influence of the mid-Holocene sea-level highstand; (2°) mangrove contraction with an increased contribution of C[sub.3] terrestrial plants between ~2870 and ~84 cal yrs BP due to an RSL fall, and (3°) mangrove expansion onto the highest tidal flats since ~84 cal yr BP due to a relative sea-level rise. However, significant mangrove areas were converted to fish farming before 1984 CE. Spatial-temporal analysis also indicated a mangrove expansion since 1984 CE due to mangrove recolonization of shrimp farming areas previously deforested for pisciculture. This work mainly evidenced a trend of mangrove expansion due to RSL rise preceding the effects of anthropogenic emissions of CO[sub.2] in the atmosphere and the resilience of these forests in the face of anthropogenic interventions.
Author(s): Sérgio. P. D. Q. Nunes [1]; Marlon C. França [1,2]; Marcelo C. L. Cohen (corresponding author) [1,3,*]; Luiz C. R. Pessenda [4]; Erika S. F. Rodrigues [1]; Evandro A. [...]