High-resolution palynology signals in surface sediments of coastal Hainan Island of China

IF 1.5 4区 地球科学 Q2 PALEONTOLOGY Marine Micropaleontology Pub Date : 2023-03-01 DOI:10.1016/j.marmicro.2023.102210
Dileep B. Herath , Chuanxiu Luo , Chixin Chen , Shuhuan Du , Rong Xiang , Vidusanka Thilakanayaka , Gayan Bandara , Dhanushka Devendra , Zijie Yang , Thilina Munasinghe
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引用次数: 2

Abstract

Studies on pollen in marine surface sediments are important for understanding the distribution mechanisms of pollen and spores into the ocean, and they are also useful in micro-paleontological studies. In this study, high-resolution palynological analysis of marine surface sediment samples from the south and southeastern inner-shelf regions of Hainan Island was performed to understand the distribution mechanism of marine surface pollen and its relationship with terrestrial vegetation. The results indicated that fern spores are the most common type, followed by tree pollen and herbaceous pollen. A majority of total pollen and spore concentrations are dominated by fern spores because the sample sites are highly concentrated with Microlepia and Polypodiaceae spores, mainly due to anthropogenic activities. The variation in tree pollen concentrations (especially for Pinus, Quercus, and Castanopsis) suggested that these pollen grains were transported mainly by wind patterns and rivers from Hainan Island. The pollen concentrations and percentage analysis in the study area showed that the inner-shelf sites have higher values than far offshore sites, reflecting a relationship between modern pollen distribution patterns and nearby landmass vegetation. Based on the principal component analysis of the resulting pollen and spore percentages, there are two main factors affecting the pollen distribution around the study area: possible human activities that have modified Hainan Island and wind–river transport toward the study area. This is the first study to discover that the presence of fern spores across the shelf is unusual, implying widespread lateral mixing in the south and southeastern Hainan Island inner-shelf region.

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海南岛海岸表层沉积物的高分辨率孢粉学信号
海洋表层沉积物花粉的研究对于了解花粉和孢子在海洋中的分布机制具有重要意义,对微生物古生物学研究也有重要意义。本研究通过对海南岛南部和东南部陆架内区海洋表层沉积物样品的高分辨率孢粉学分析,了解海洋表层花粉的分布机制及其与陆地植被的关系。结果表明,蕨类植物孢子最常见,其次是树木花粉和草本花粉。大部分花粉和孢子以蕨类孢子为主,这主要是由于人类活动的影响,这些取样点高度集中了小松科和水蛭科的孢子。树木花粉浓度的变化(特别是松、栎和栲)表明,这些花粉主要是通过风型和河流从海南岛运来的。研究区花粉浓度和百分比分析表明,陆架内站点的花粉浓度和百分比高于远岸站点,反映了现代花粉分布模式与附近陆地植被的关系。主成分分析表明,影响研究区花粉分布的主要因素是人类活动对海南岛的影响和向研究区的风河输送。这是首次发现蕨类孢子在大陆架上的存在是不寻常的,这意味着在海南岛南部和东南部的大陆架内区域广泛存在横向混合。
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来源期刊
Marine Micropaleontology
Marine Micropaleontology 地学-古生物学
CiteScore
3.70
自引率
15.80%
发文量
62
审稿时长
26.7 weeks
期刊介绍: Marine Micropaleontology is an international journal publishing original, innovative and significant scientific papers in all fields related to marine microfossils, including ecology and paleoecology, biology and paleobiology, paleoceanography and paleoclimatology, environmental monitoring, taphonomy, evolution and molecular phylogeny. The journal strongly encourages the publication of articles in which marine microfossils and/or their chemical composition are used to solve fundamental geological, environmental and biological problems. However, it does not publish purely stratigraphic or taxonomic papers. In Marine Micropaleontology, a special section is dedicated to short papers on new methods and protocols using marine microfossils. We solicit special issues on hot topics in marine micropaleontology and review articles on timely subjects.
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