analysis of mangrove forest succession, using sediment cores: a case study in the cananéia -iguape coastal system, são paulo brazil

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ID: 252911
2009
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Abstract
Sediment cores are an essential tool for the analysis of the dynamics of mangrove succession. Coring was used to correlate changes in depositional environments and lateral sedimentary facies with discrete stages of forest succession at the Cananéia-Iguape Coastal System in southeastern Brazil. A local level successional pattern was examined based on four core series T1) a sediment bank; T2) a smooth cordgrass Spartina alterniflora bank; T3) an active mangrove progradation fringe dominated by Laguncularia racemosa, and; T4) a mature mangrove forest dominated by Avicennia schaueriana. Cores were macroscopically described in terms of color, texture, sedimentary structure and organic components. The base of all cores exhibited a similar pattern suggesting common vertical progressive changes in depositional conditions and subsequent successional colonization pattern throughout the forest. The progradation zone is an exposed bank, colonized by S. alterniflora. L. racemosa, replaces S. alterniflora as progradation takes place. As the substrate consolidates A. schaueriana replaces L. racemosa and attains the greatest structural development in the mature forest. Cores collected within the A. schaueriana dominated stand contained S. alterniflora fragments near the base, confirming that a smooth cordgrass habitat characterized the establishment and early seral stages. Cores provide a reliable approach to describe local-level successional sequences in dynamic settings subject to drivers operating on multiple temporal and spatial scales where spatial heterogeneity can lead to multiple equilibria and where similar successional end-points may be reached through convergent paths.
Testemunhos de sondagem apresentam-se como importantes ferramentas para análise da dinâmica sucessional de bosques de mangue. A sucessão dos bosques de mangue, no litoral sul do Estado de São Paulo (Brasil), foi determinada com base em quatro testemunhos de sondagem: T1) banco de sedimento; T2) banco de gramínea Spartina alterniflora; T3) bosque de mangue em progradação, dominado por Laguncularia racemosa; e T4) bosque de mangue maduro, dominado por Avicennia schaueriana. Os testemunhos foram descritos macroscopicamente em função de cor, textura, estruturas sedimentares e componentes orgânicos. A base de todos os testemunhos apresentou padrão semelhante, sugerindo colonização similar por bosques de mangue , em toda sua extensão. Áreas em progradação apresentam banco de sedimento exposto, colonizado por S. alterniflora. Faixa de L. racemosa substitui a gramínea, com a progradação. À maior consolidação do sedimento, passam a dominar outras espécies típicas de mangue, como observado no bosque maduro, onde A. schaueriana alcança grande desenvolvimento estrutural. No testemunho coletado na área colonizada pelo bosque maduro dominado por A. shaueriana, há fragmentos de S. alterniflora próximo à base, confirmando o papel da gramínea como espécie pioneira. Os testemunhos analisados refletem a zonação e a sucessão dos bosques de mangue da região.
Reference Key
cunha-lignon2009braziliananalysis Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Marília Cunha-Lignon;Michel M. Mahiques;Yara Schaeffer-Novelli;Marcelo Rodrigues;Daniel A. Klein;Samara C. Goya;Ricardo P. Menghini;Clodoaldo C. Tolentino;Gilberto Cintrón-Molero;Farid Dahdouh-Guebas
Journal Journal of genetic counseling
Year 2009
DOI
10.1590/S1679-87592009000300001
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000300001
Keywords
succession brasil mangrove braziloceanography manguezal cananéia-iguape coastal system

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