Access of Dynamics Vegetation during Holocene by Poaceae Pollen Grains

Radaeski, Jefferson Nunes

doi:10.15406/oajs.2017.01.00015

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…Morphological differences between the pollen grains of Poaceae allowed relate them to specific climatic and environmental patterns (Schüler and Belhing, 2011; Radaeski et al, 2016, 2017). The largest Poaceae grains were only observed during the last 1500 years and were attributed to maize crops ( Zea mays ).…”

Section: Discussionmentioning

confidence: 99%

“…To differentiate Poaceae pollen grains, following Radaeski et al (2016), we separated them into three different size classes; small (<20 µm), medium (between 20 and 46 µm), and large (>46 µm). According to that study, smaller grains indicate grassland dominance linked to dry conditions, while cultivated plants (e.g., Zea mays ) produce the largest pollen grains (Radaeski and Bauermann, 2017). Gosling et al (2009) suggest that Poaceae frequencies of less than 20% are common in the Cerrado compared with their higher frequencies in lake environments (30–50%; Table1).…”

Section: Methodsmentioning

confidence: 96%

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Landscape changes in the southern Amazonian foreland basin during the Holocene inferred from Lake Ginebra, Beni, Bolivia

et al. 2019

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Our study is located in northern Beni and aims to improve knowledge on regional landscape changes from the last 8600 years, based on pollen and charcoal analyses from a lacustrine sediment core from Lake Ginebra. Our results showed that gallery forest and lacustrine sediment were observed from 8645 until 3360 cal yr BP. After a change from a lacustrine to a swamp environment at 1700 cal yr BP, the Cerrados and the Mauritia swamp became installed 1000 years ago on our study site. The environmental changes we observed over the last 8600 years in the Ginebra record reinforce the evidence of a west–east climatic gradient with the persistence of rain forest throughout the Holocene on the western side and the presence of the Cerrados until the late Holocene on the eastern side. Moreover, the persistence of a wet forest in the early to mid-Holocene in southwestern Amazonia highlighted some local responses to the global trend that could be related to the distance from the Andes; while in the late Holocene, both an increase in insolation and strengthening of the South American summer monsoon system enabled the installation of a seasonal flooded savanna in northern Beni and of the rain forest in eastern Beni.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 96%

Landscape changes in the southern Amazonian foreland basin during the Holocene inferred from Lake Ginebra, Beni, Bolivia

et al. 2019

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“…However, only Zea mays can be differentiated from the native species of the State, since the pollen grains of the other non-native taxa were similar in size to the native species described. [22][23][24][25] Thus, in pollen records dating from 1.000 BP to the modern age is impossible to recognize which pollen grains of native and non-native. Non-native species with welldefined dates of introduction in southern Brazil may indicate when their pollen grains may be present in Holocene quaternary sediments (Figure 7).…”

Section: Discussionmentioning

confidence: 99%

“…[19][20][21][22][23] These modern Poaceae pollen database allowed analysis of Poaceae pollen grains of Quaternary sediments that showed dynamics of grasslands vegetation in the past. 24 Even so, gaps still have to be filled on the pollen morphology of species of this family introduced in South America to more accurately identify the human occupation in the region during the Holocene. The pollen grains of the 14 main nonnative species of Poaceae distributed in the Rio Grande do Sul were analyzed in order to record possible human occupation indicators for quaternary samples from southern Brazil.…”

Section: Introductionmentioning

confidence: 99%

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Anthropic pollen indicators: poaceae pollen of non-native species in Southern Brazil

Radaeski¹

2018

OAJS

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The Poaceae species have their use for food known in Brazil and in the world. Maize, which today accounts for 21% of human nutrition, was changed 9,000 years ago from Teosinte. Many indigenous people grow maize in South America to feed the tribe. In Brazil, several Poaceae species of African origin were introduced accidentally purposely in the colonial period, to be used as fodder, as was the case of annoni grass (Eragrostis plana Nees). Palynological studies may reconstitute a vegetation of the past, but due to the similarity of Poaceae pollen grains, so far maize (Zea mays L.) can be identified with the safety of the palynological studies. The aim of the study here is to identify and describe the pollen grains of Poaceae exotic cultivated species. The pollen grains were collected from herborized plants and processed by usual techniques of palynology (acetolysis). The results allow identification of three pollen groups (pollen of ornamental, cereal and corn plants). Pollen morphology of 14 species of exotic Poaceae in Rio Grande do Sul state showed differences in sizes of pollen grains. The results of this research showed that cultivars of grasses can be identified in sedimentary profiles. However, some pollen grains have the size of pollen similar to Poaceae pollen of native species. Thus, it is necessary knowledge about the vegetation of study area and surrounds distributed cultivars of grasses. Nevertheless, this pollen database is important to mapping with more precision the cultivation of these cereals in the Late Holocene. Citation: Radaeski JN, Evaldt ACP, Bauermann SG. Anthropic pollen indicators: poaceae pollen of non-native species in Southern Brazil. Open Access J Sci. 2018;2(2):134-141. Citation: Radaeski JN, Evaldt ACP, Bauermann SG. Anthropic pollen indicators: poaceae pollen of non-native species in Southern Brazil. Open Access J Sci. 2018;2(2):134-141.

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Understanding ecosystem dynamics of herbaceous grasslands (Campos) and arboreal forests (Bambuseae) using Poaceae pollen grains in the Coastal Plains Holocene sediments of Southern Brazil

2019

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Access of Dynamics Vegetation during Holocene by Poaceae Pollen Grains

Cited by 3 publications

References 4 publications

Landscape changes in the southern Amazonian foreland basin during the Holocene inferred from Lake Ginebra, Beni, Bolivia

Landscape changes in the southern Amazonian foreland basin during the Holocene inferred from Lake Ginebra, Beni, Bolivia

Anthropic pollen indicators: poaceae pollen of non-native species in Southern Brazil

Understanding ecosystem dynamics of herbaceous grasslands (Campos) and arboreal forests (Bambuseae) using Poaceae pollen grains in the Coastal Plains Holocene sediments of Southern Brazil

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