We investigated the potential of mangrove pollen from Mahé, Seychelles, to improve existing metre‐scale Late Holocene sediment‐based sea‐level reconstructions. Mangrove species at two mangrove sites are broadly zoned according to elevation within the tidal frame. Modern pollen rain from traps deployed for 1 year generally have a poor relationship with modern vegetation, and relatively low pollen production rates. Pollen from mangrove species that live in narrow elevation zones (e.g. Avicennia marina) are poorly represented in modern pollen rain, while pollen from mangrove species that live across a larger elevational range (e.g. Rhizophora mucronata) are relatively well represented. Pollen was found in extremely low concentrations in mangrove surface and core sediments, which inhibited further study into pollen transport and preservation. The results from this modern study demonstrate that utilizing mangrove pollen would not decrease existing metre‐scale vertical uncertainties in Late Holocene sea‐level reconstructions in the Seychelles. We suggest that this approach may still be successful in other locations if mangrove vegetation is (i) zoned at a more extensive lateral scale and (ii) is closely associated with modern pollen rain and surface sediments, and (iii) sedimentological conditions promote the preservation of pollen in fossil sequences.

中文翻译：

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评估在塞舌尔马埃岛使用红树林花粉作为海平面定量指标

我们研究了塞舌尔马埃岛的红树林花粉对改善现有的以米级为基础的全新世晚期沉积物海平面重建的潜力。根据潮汐框架内的海拔高度，将两个红树林地点的红树林物种大致划分为多个区域。部署了1年的疏水阀产生的现代花粉雨通常与现代植被关系较差，并且花粉生产率较低。生活在狭窄海拔地区的红树林花粉（例如Avicennia marina）的花粉在现代花粉雨中表现不佳，而生活在较大海拔范围的红树林物种的花粉（例如Rhizophora mucronata））代表得比较好。花粉在红树林表层和核心沉积物中的浓度极低，这阻碍了对花粉运输和保存的进一步研究。这项现代研究的结果表明，在塞舌尔晚新世晚期海平面重建中，利用红树林花粉不会减少现有的米级垂直不确定性。我们建议，如果将红树林植被（i）定位在更宽的横向尺度上，并且（ii）与现代花粉雨和地表沉积物密切相关，并且（iii）沉积条件促进保护，那么这种方法在其他地区仍然可能成功。化石序列中的花粉数量。