Impacts of rapid sea‐level rise on mangrove deposit erosion: application of taraxerol and <i>Rhizophora</i> records

Kim, Jung-Hyun; Dupont, Lydie M; Behling, Hermann; Versteegh, Gerard J.M.

doi:10.1002/jqs.904

Cited by 33 publications

(16 citation statements)

References 22 publications

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“…5). A raised representation of mangroves both in relative pollen abundance and by biomarkers during this time is explained by erosion of coastal mangrove peat during transgression and sea-level rise (Kim et al, 2005).…”

Section: Deglaciationmentioning

confidence: 86%

“…The levels of high sedimentation rates between 8 and 3 mbsf (14-9 ka) shows raised Rhizophora pollen percentages. This increased relative abundance of mangrove pollen comes together with increased amounts of other mangrove materials and is interpreted as sedimentation of eroded mangrove peat (Kim et al, 2005). Sedimentation levels remain high until 9 ka, when they drop again to levels between 25 and 40 cm/ka.…”

Section: Age Model and Sedimentation Ratesmentioning

confidence: 97%

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Thirty thousand years of vegetation development and climate change in Angola (Ocean Drilling Program Site 1078)

Dupont

Behling²,

Kim

2008

Clim. Past

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Abstract. ODP Site 1078 situated under the coast of Angola provides the first record of the vegetation history for Angola. The upper 11 m of the core covers the past 30 thousand years, which has been analysed palynologically in decadal to centennial resolution. Alkenone sea surface temperature estimates were analysed in centennial resolution. We studied sea surface temperatures and vegetation development during full glacial, deglacial, and interglacial conditions. During the glacial the vegetation in Angola was very open consisting of grass and heath lands, deserts and semi-deserts, which suggests a cool and dry climate. A change to warmer and more humid conditions is indicated by forest expansion starting in step with the earliest temperature rise in Antarctica, 22 thousand years ago. We infer that around the period of Heinrich Event 1, a northward excursion of the Angola Benguela Front and the Congo Air Boundary resulted in cool sea surface temperatures but rain forest remained present in the northern lowlands of Angola. Rain forest and dry forest area increase 15 thousand years ago. During the Holocene, dry forests and Miombo woodlands expanded. Also in Angola globally recognised climate changes at 8 thousand and 4 thousand years ago had an impact on the vegetation. During the past 2 thousand years, savannah vegetation became dominant.

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Section: Deglaciationmentioning

confidence: 86%

Section: Age Model and Sedimentation Ratesmentioning

confidence: 97%

Thirty thousand years of vegetation development and climate change in Angola (Ocean Drilling Program Site 1078)

Dupont

Behling²,

Kim

2008

Clim. Past

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“…It has been predicted that as sea level rises, accompanying the rapid climate changes (Pernetta 1993;Field 1995;Ellison and Farnsworth 1997;Das et al 2002;Kim et al 2005;Jagtap and Nagle 2007;Gilman et al 2008), mangroves tend to retreat landwards. And, of course, any significant rise in sea level resulting from global warming will mean encroachment on the relatively narrow zone within which mangroves flourish (Pernetta 1993;Das et al 2002;Kim et al 2005;Jagtap and Nagle 2007;Gilman et al 2008). Destruction of mangrove habitats means a loss of the mangrove resource: as mangroves decline, so too do timber and charcoal production and fisheries, and the livelihood of the people who depend on them.…”

Section: Exploitation Of Mangrovesmentioning

confidence: 98%

Salt tolerance mechanisms in mangroves: a review

Parida

Jha

2010

Trees

317

230

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Mangroves are woody plants which form the dominant vegetation in tidal, saline wetlands along tropical and subtropical coasts. The current knowledge concerning the most striking feature of mangroves i.e., their unique ability to tolerate high salinity is summarized in the present review. In this review, we shall discuss recent studies that have focused on morphological, anatomical, physiological, biochemical, molecular and genetic attributes associated with the response to salinity, some of which presumably function to mediate salt tolerance in the mangroves. Here we shall also review the major advances recently made at both the genetic and the genomic levels in mangroves. Salinity tolerance in mangroves depends on a range of adaptations, including ion compartmentation, osmoregulation, selective transport and uptake of ions, maintenance of a balance between the supply of ions to the shoot, and capacity to accommodate the salt influx. The tolerance of mangroves to a high saline environment is also tightly linked to the regulation of gene expression. By integrating the information from mangroves and performing comparisons among species of mangroves and non-mangroves, we could give a general picture of salt tolerance mechanisms of mangroves, thus providing a new avenue for development of salt tolerance in crop plants through effective breeding strategies and genetic engineering techniques.

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“…During the subsequent sea-level rise, only pioneer species from the Amaranthaceae, tolerating highly saline environments with a permanent tidal influence and having good colonizing abilities, could expand under these stressful conditions. The development of mangroves at ∼ 14.8 kyr BP might reflect either the expansion of mangrove vegetation along the Rufiji Delta or the erosion of mangrove peat during sea-level rise (Hooghiemstra and Agwu, 1986;Dupont and Agwu, 1991;Lézine at al., 1995Lézine at al., , 1996Dupont, 1999;Kim et al, 2005;Scourse et al, 2005). Mangroves are most common in wetter habitats and swamps where brackish water accumulates.…”

Section: Expansion Of the Salt Marshes And Mangroves: Deglacial Ecolomentioning

confidence: 99%

Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania)

et al. 2015

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Abstract. In tropical eastern Africa, vegetation distribution is largely controlled by regional hydrology, which has varied over the past 20 000 years. Therefore, accurate reconstructions of past vegetation and hydrological changes are crucial for a better understanding of climate variability in the tropical southeastern African region. We present high-resolution pollen records from a marine sediment core recovered offshore of the Rufiji River delta. Our data document significant shifts in pollen assemblages during the last deglaciation, identifying, through changes in both upland and lowland vegetation, specific responses of plant communities to atmospheric (precipitation) and coastal (coastal dynamics and sea-level changes) alterations. Specifically, arid conditions reflected by a maximum pollen representation of dry and open vegetation occurred during the Northern Hemisphere cold Heinrich event 1 (H1), suggesting that the expansion of drier upland vegetation was synchronous with cold Northern Hemisphere conditions. This arid period is followed by an interval in which forest and humid woodlands expanded, indicating a hydrologic shift towards more humid conditions. Droughts during H1 and the shift to humid conditions around 14.8 kyr BP in the uplands are consistent with latitudinal shifts of the intertropical convergence zone (ITCZ) driven by high-latitude Northern Hemisphere climatic fluctuations. Additionally, our results show that the lowland vegetation, consisting of well-developed salt marshes and mangroves in a successional pattern typical for vegetation occurring in intertidal habitats, has responded mainly to local coastal dynamics related to marine inundation frequencies and soil salinity in the Rufiji Delta as well as to the local moisture availability. Lowland vegetation shows a substantial expansion of mangrove trees after ∼ 14.8 kyr BP, suggesting an increased moisture availability and river runoff in the coastal area. The results of this study highlight the decoupled climatic and environmental processes to which the vegetation in the uplands and the Rufiji Delta has responded during the last deglaciation.

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Impacts of rapid sea‐level rise on mangrove deposit erosion: application of taraxerol and Rhizophora records

Cited by 33 publications

References 22 publications

Thirty thousand years of vegetation development and climate change in Angola (Ocean Drilling Program Site 1078)

Thirty thousand years of vegetation development and climate change in Angola (Ocean Drilling Program Site 1078)

Salt tolerance mechanisms in mangroves: a review

Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania)

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