Holocene mangrove dynamics in Makoba Bay, Zanzibar

Punwong, Paramita; Marchant, Robert; Selby, Katherine

doi:10.1016/j.palaeo.2013.04.004

Cited by 39 publications

(42 citation statements)

References 72 publications

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“…The mid-Holocene dates for this sediment could come from charcoal produced through natural burning, a phenomenon that appears to have occurred more commonly in the mid-Holocene drought phase of tropical Africa (Kiage and Liu 2006). An increase in large charcoal particles has also been documented at Unguja Ukuu and Makoba Bay on the west coast of the island around this time (Punwong et al 2013a(Punwong et al , 2013b. The talus deposition also explains why many of the deposits slope down to the east, as Trench 10 captures the eastern side of the cone.…”

Section: Phase 2: Terminal Pleistocene Lsa Occupationmentioning

confidence: 79%

Reinvestigation of Kuumbi Cave, Zanzibar, reveals Later Stone Age coastal habitation, early Holocene abandonment and Iron Age reoccupation

Shipton

Crowther

Kourampas

et al. 2016

Azania: Archaeological Research in Africa

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Section: Phase 2: Terminal Pleistocene Lsa Occupationmentioning

confidence: 79%

Reinvestigation of Kuumbi Cave, Zanzibar, reveals Later Stone Age coastal habitation, early Holocene abandonment and Iron Age reoccupation

Shipton

Crowther

Kourampas

et al. 2016

Azania: Archaeological Research in Africa

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“…[Insert Figure AMS dates from these three cores are shown in Figure 2 (see also Punwong et al (2013b)). …”

Section: Previous Work and Study Areamentioning

confidence: 99%

“…The original bulk sediment samples dated from the study site contained a mixture of wood fragments, organic remains and charcoal (Punwong et al, 2013b). For this study we target eight levels adjacent to those previously sampled for bulk We could not re-sample the exact same core depths that were used for bulk 14 C AMS analysis because the sediment samples had been removed for previous analyses, but in all cases we resampled within 4 cm of the original levels (Table 1).…”

Section: Ams Datingmentioning

confidence: 99%

“…Pollen records from the study site show vertical trends that are ecologically sensible, stratigraphically coherent and apparently unaffected by significant bioturbation, yet bulk 14 C AMS ages on organic-rich sand and silt-rich mangrove deposits record age reversals that limit their utility for sea level studies (Punwong et al, 2013b). …”

Section: Introductionmentioning

confidence: 99%

“…The wide distribution of mangrove pollen from different species across modern mangrove environments means that within-mangrove elevation changes are not readily reconstructed in the fossil record (Punwong et al, 2013b). However, it is interesting to note that the highest organic carbon values are found in the top ~1 m of AMAK-1 and BMAK-1 at Makoba Bay, which is dated to after c. 2900 cal.…”

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confidence: 99%

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Radiocarbon dating of mangrove sediments to constrain Holocene relative sea-level change on Zanzibar in the southwest Indian Ocean

et al. 2015

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We cannot determine whether there was a RSL highstand above present on Zanzibar during the mid 2 to lateHolocene. The RSL reconstruction agrees broadly with changes predicted by the ICE-5G geophysical model, which includes 4 m of ice equivalent sea-level rise between 7000 and 4000 cal.yr BP. Our new dating approach has the potential to provide improved chronologies with which to interpret sea level data from this and other mangrove environments.

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Inter‐annual hydroclimatic variability in coastal Tanzania

Rohli

Ates

Rivera‐Monroy

et al. 2019

Intl Journal of Climatology

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Climatic controls regulate the coupled natural and human systems in coastal Tanzania, where mangrove wetlands provide a wealth of ecosystem services to coastal communities. Previous research has explained the precipitation seasonality of eastern Africa in terms of the local monsoons. This research examines a wider range of hydroclimatic variables, including water vapour flux, evapotranspiration, runoff, and ocean salinity, and the sources of low‐frequency atmosphere–ocean variability that support mangrove productivity and associated ecosystem services. Results confirm previous work suggesting that the northeast monsoon (kaskazi) largely corresponds to the “short rains” of October–December and extends through February, while the southeast monsoon (kusi) corresponds to the “long rains” of March–May and the drier June–September. The Indian Ocean Dipole (IOD) and, to a lesser extent, El Niño–Southern Oscillation (ENSO) are important modulators not only of precipitation (as has been shown previously) but also of water vapour flux, evapotranspiration, runoff, and salinity variability. During kaskazi, positive (negative) hydroclimatic anomalies occur during positive (negative) IOD, with a stronger IOD influence occurring during its positive phase, when seasonal anomalies of precipitation, evapotranspiration, and runoff exceed +50, 25, and 100%, and nearby salinity decreases by 0.5 practical salinity units. During kusi, the contrast between the positive and negative IOD modes is subtler, and the pattern is dictated more by variability in “long rains” months than in the dry months. The coincidence of the positive IOD and El Niño amplify this hydroclimatic signal. Because previous work suggests the likelihood of increased tendency for positive IOD and increased moisture variability associated with El Niño events in the future, wetter conditions may accompany the kaskazi, with less change expected during the kusi. These results advance understanding of the key environmental drivers controlling mangrove productivity and wetland spatial distribution that provide ecosystem services essential to the well‐being of the human population.

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Holocene mangrove dynamics in Makoba Bay, Zanzibar

Cited by 39 publications

References 72 publications

Reinvestigation of Kuumbi Cave, Zanzibar, reveals Later Stone Age coastal habitation, early Holocene abandonment and Iron Age reoccupation

Reinvestigation of Kuumbi Cave, Zanzibar, reveals Later Stone Age coastal habitation, early Holocene abandonment and Iron Age reoccupation

Radiocarbon dating of mangrove sediments to constrain Holocene relative sea-level change on Zanzibar in the southwest Indian Ocean

Inter‐annual hydroclimatic variability in coastal Tanzania

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