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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Pollen dispersal patterns in marine surface sediments from the San Jorge Gulf, SE Patagonia (Argentina)
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Pollen dispersal patterns in marine surface sediments from the San Jorge Gulf, SE Patagonia (Argentina)

机译：Se Patagonia（阿根廷）的海洋表面沉积物中的花粉分散模式

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This paper analyzes the distribution patterns of pollen and spore assemblages in modern surface sediments recovered from the bottom of the San Jorge Gulf (SJG) and from offshore sites, in relation to the location of different phytogeographic provinces surrounding the SJG, including the distant forest from southwestern Patagonia. Results reveal that pollen spectra are dominated by Chenopodiaceae-Amaranthaceae, Poaceae, Asteraceae subf. Asteroideae, Colliguaja integerrima and Ephedra sp.; which represents the vegetation adjacent to the SJG. Overall, the pollen distribution in surface sediments reflects the location of the different phytogeographic provinces and will be used as modern-analogues to document vegetation history around the SJG. Pollen assemblages also reveal the latitudinal variation of vegetation taxa in the Patagonian steppe, which is characterized by a slight increase in herbaceous pollen and a decrease in high shrubs (e.g. Colliguaja integerrima) towards the southern-central part of the SJG. Furthermore, we identified two pollen taxa from the southwestern Patagonian forest, Nothofagus and Podocarpus that could be used as indicators of past dynamics and variations of the Southern Westerly Wind Belt (SWWB) in the SJG during the Late Pleistocene and Holocene. High pollen concentrations are recorded at the central part of the SJG (480-8080 grains/g), while low concentrations are measured in the northern and southern parts of the Gulf, as well as at offshore sites (26-1806 grains/g). The pollen distribution in the study area is most likely governed by the SWWB in combination with the marine sediment composition and surface currents flowing through the SJG.
机译：本文分析了从San Jorge Gulf（SJG）的底部和近海地点恢复的现代表面沉积物中花粉和孢子组合的分布模式，与SJG周围的不同植物地图省份的位置相关，包括遥远的森林西南巴塔哥尼亚。结果表明，花粉光谱由Chenopodiaceae-Amaranthaceae，Poaceae，Asteraceae Subf主导。小树花田，Colliguaja Integerrima和Ephedra Sp。这代表了与SJG相邻的植被。总体而言，表面沉积物的花粉分布反映了不同植物地图省份的位置，并将被用作现代类似物以在SJG周围记录植被历史。花粉组合还揭示了巴塔哥代草原植被分类群的纬度变化，其特征在于草本花粉的略微增加，高灌木（例如Colliguaja Integerma）朝向SJG的南部 - 中央部分的降低。此外，我们发现了来自西南巴塔哥州森林，Nothofagus和Podocarpus的两种花粉分类群，可以用作晚熟和全新世中SJG的过去动态和南部西风风带（SWWB）的指标。高花粉浓度记录在SJG的中心部分（480-8080颗粒/ g），而在海湾北部和南部的北部和近海地点（26-1806谷物/ g）中测量低浓度。研究领域的花粉分布最有可能由SWWB与流过SJG的海洋沉积物组成和表面电流组合。

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