Amazonian mangrove dynamics during the last millennium: The relative sea-level and the Little Ice Age

Cohen, Marcelo Cancela Lisboa; Behling, Hermann; Lara, Rubén

doi:10.1016/j.revpalbo.2005.05.002

Cited by 79 publications

(72 citation statements)

References 56 publications

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“…The findings in this study corroborate several studies in Brazil [11][12][13]47] and some parts of South America [7,49], portraying the cooling and decrease in precipitation during the LIA, which showed a climatically anomalous period between 1550 and 1850. However, these findings contrast with an increase in precipitation in South America as reported by Peng and Miller [50] and Haug et al [51].…”

Section: Consideration Of the Lia In South Americasupporting

confidence: 91%

“…The absence of aquatic plant and phytoplankton blooms, reflected in mid and short chain n-alkanes respectively, in the second stage (Figure 4d and 4e) indicates that less humid conditions remained. Sea level regression, accompanied by drier conditions in the same period, was observed for Brazil [11][12][13], such observations supporting our findings.…”

Section: Maat and Vegetation Cover Variationsupporting

confidence: 90%

“…For instance, in South America [6,7], advance in glaciers in the Andes was demonstrated [8], as well as aridity in the lowlands of Argentina [9] and Venezuela [8], and there is evidence from mountain glaciers suggesting increasing glaciation in Patagonia [10]. In Brazil, some studies have demonstrated change in vegetation composition during the LIA and sea level regression in northeastern and southeastern Brazil [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Little Ice Age on Climate and Vegetation Recorded by n-Alkanes and Glycerol Dialkyl Glycerol Tetraether Proxies

Machado¹,

Froehnerb²

2015

J Earth Sci Clim Change

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Keywords: Climatic changes; Little ice age; n-Alkane distributions; GDGT proxies IntroductionThe period which was subjected to much colder winters followed by warmer periods is known as the little ice age (LIA). It documented as being between about 1300 and 1870 (Mann, 2002). However, climate change could vary geographically [1]. The period is divided into two phases; the first was around 1300 until the late 1400s and the second warmer period was in in the 1500s [2]. The period between 1600 and 1850 marks its height and was characterized by changes in the hydrological cycle and perturbation of the ecosystem [2-4].Even although there much evidence for the LIA, the causes and mechanism are still under debate. The only certainty is that it was a global event. Most studies have focused on the northern hemisphere [3][4][5], and there are few studies demonstrating the occurrence of the event in the southern hemisphere. For instance, in South America [6,7], advance in glaciers in the Andes was demonstrated [8], as well as aridity in the lowlands of Argentina [9] and Venezuela [8], and there is evidence from mountain glaciers suggesting increasing glaciation in Patagonia [10]. In Brazil, some studies have demonstrated change in vegetation composition during the LIA and sea level regression in northeastern and southeastern Brazil [11][12][13].At present, paleoclimate can be reconstructed due the widespread occurrence of biomarkers multi-proxy data derived from them. The spatial and temporal character of such putative climate epochs revived the discussion and understanding of and mechanism for the LIA, as well as of the implications for climate change in the future.Typically, n-alkanes are derived from different sources (algae, photosynthetic bacteria and higher plants [14]. Different distribution patterns of n-alkanes in sediments provides information about different climatic environments and hence is widely used to understand the evolution of vegetation and reconstruct environmental changes [14,15]. The magnitude of the anthropogenic impact on the climate and the environment was recently measured from biomarker distributions [4,14]. Yet, some biomarkers can be more specific in their information than n-alkanes. For example, increasing attention has been driven to glycerol dialkyl glycerol tetraether (GDGT) compounds, polar basic constituents of the cell membrane and comprising a polar head group bonded to a non-polar hydrocarbon [16]. The structures of GDGTs are temperature dependent. When temperature increases, cyclopentane moieties are formed within the isoprenoid chain [17]. With more cyclopentane rings, the membrane is kept in a liquid crystalline state and, as a consequence, proton permeation is reduced.According to Weijers et al. [18] there are some environmental controls on the distributions of GDGTs, so two indices were proposed for quantifying the degree of methylation (MBT) and cyclization (CBT), both being effective in palaeoenvironmental studies to reconstruct mean annual air temperature (MAAT). Since branche...

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Section: Consideration Of the Lia In South Americasupporting

confidence: 91%

Section: Maat and Vegetation Cover Variationsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Effect of the Little Ice Age on Climate and Vegetation Recorded by n-Alkanes and Glycerol Dialkyl Glycerol Tetraether Proxies

Machado¹,

Froehnerb²

2015

J Earth Sci Clim Change

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“…Entretanto, evidências, tanto na costa do Pará e Maranhão (COHEN et al, 2005;BEHLING & COSTA, 2001), quanto na costa cearense a oeste da área de estudo (IRION et al, 2012), sugerem que o NRM, para grande parte da porção equatorial da costa brasileira, não esteve acima do nível atual nos últimos 7.000 anos. Levando-se em consideração esse panorama, a área de estudo apresenta uma confi guração anômala.…”

Section: Modelo Evolutivounclassified

Faciologia E Evolução Dos Depósitos Eólicos Costeiros Do Oeste Do Ceará (Brasil) No Holoceno Tardio

Mesquita

Filho

Duarte

et al. 2016

Rev. Bras. Geomorfol.

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“…In eastern Amazonia, cores were used to describe coastal environmental changes and Holocene mangrove ecosystem dynamics COSTA, 2001;BEHLING et al, 2001;COHEN et al, 2005). Amaral et al (2006) provide information on the Late development Holocene of a mangrove at Itanhaém (State of São Paulo).…”

Section: Introductionmentioning

confidence: 99%

Analysis of mangrove forest succession, using sediment cores: a case study in the Cananéia -Iguape coastal system, São Paulo Brazil

et al. 2009

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A B S T R A C TSediment 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. RESUMOTestemunhos 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 r...

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Amazonian mangrove dynamics during the last millennium: The relative sea-level and the Little Ice Age

Cited by 79 publications

References 56 publications

Effect of the Little Ice Age on Climate and Vegetation Recorded by n-Alkanes and Glycerol Dialkyl Glycerol Tetraether Proxies

Effect of the Little Ice Age on Climate and Vegetation Recorded by n-Alkanes and Glycerol Dialkyl Glycerol Tetraether Proxies

Faciologia E Evolução Dos Depósitos Eólicos Costeiros Do Oeste Do Ceará (Brasil) No Holoceno Tardio

Analysis of mangrove forest succession, using sediment cores: a case study in the Cananéia -Iguape coastal system, São Paulo Brazil

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