Pub Date : 2023-04-06DOI: 10.1080/01916122.2022.2134937
Pujarini Samal, S. Singarasubramanian, J. Srivastava, P. S. Jena, A. Shivam, R. Bhushan
ABSTRACT This research assesses the impacts of climate change and relative sea level (RSL) fluctuations on coastal vegetation during the past 2000 years along the Mahanadi River delta, northeast coast of India. Sediment samples of a 2.6 m trench from Barhatubi area located in the lower flood plain of Mahanadi River delta were studied for sedimentological and pollen analysis. Mangrove succession can be divided into three zones: (1) Freshwater marsh (∼1980–1420 cal yr BP); (2) Tidal flat (∼1420–770 cal yr BP) and (3) Landward mangrove margin (∼770 cal yr BP-Present). A transgressive shift from floodplain freshwater marsh to a tidal flat is recorded between ∼1980–1420 cal yr BP which is evidenced by upland tree taxa, Poaceae, pteridophyte and fungal spores along with low percentage of mangroves such as Avicennia, Sonneratia and Rhizophora representing the landward edge of the tidal region. Dominance of Sonneratia and a decline in terrestrial taxa reflects a rise in the relative sea level around ∼1420 cal yr BP with less freshwater input from land suggesting a weakened monsoon condition. After ∼770 cal yr BP, an overall regressive phase with small cycles of relative sea level rise/fall has been observed due to the dominance of salt tolerant Avicennia along with Rhizophora, Excoecaria agallocha and Aegialitis rotundifolia alternating with Sonneratia and other marine palynomorphs.
摘要本研究评估了过去2000年来印度东北海岸马哈纳迪河三角洲气候变化和相对海平面波动对沿海植被的影响。对Mahanadi河三角洲下游泛滥平原Barhatubi地区2.6 m沟渠的沉积物样本进行了沉积学和花粉分析。红树林演替可分为三个区域：（1）淡水沼泽（～1980–1420 cal yr BP）；（2） 潮坪（～1420–770 cal yr BP）和（3）陆地红树林边缘（～770 cal yr-BP存在）。在1980年至1420年的BP期间，记录到从洪泛平原淡水沼泽到滩涂的海侵转变，这可以通过高地树木分类群、禾本科、蕨类植物和真菌孢子以及代表潮汐区陆地边缘的低百分比红树林（如Avicennia、Sonneratia和Rhizophora）来证明。Sonneratia的优势和陆地分类群的减少反映了约1420 cal yr BP的相对海平面上升，陆地淡水输入减少，这表明季风条件减弱。在约770 cal yr BP之后，由于耐盐阿维森尼亚属与根须藻、阿氏Excoecaria agallocha和圆叶盾叶盾叶藻与海桑属和其他海洋孢粉形态交替，观察到了相对海平面上升/下降的小周期的总体回归阶段。
{"title":"Coastal Vegetation Dynamics in Response to Climatic and Relative Sea Level Changes in Mahanadi River Delta, NE Coast of India","authors":"Pujarini Samal, S. Singarasubramanian, J. Srivastava, P. S. Jena, A. Shivam, R. Bhushan","doi":"10.1080/01916122.2022.2134937","DOIUrl":"https://doi.org/10.1080/01916122.2022.2134937","url":null,"abstract":"ABSTRACT This research assesses the impacts of climate change and relative sea level (RSL) fluctuations on coastal vegetation during the past 2000 years along the Mahanadi River delta, northeast coast of India. Sediment samples of a 2.6 m trench from Barhatubi area located in the lower flood plain of Mahanadi River delta were studied for sedimentological and pollen analysis. Mangrove succession can be divided into three zones: (1) Freshwater marsh (∼1980–1420 cal yr BP); (2) Tidal flat (∼1420–770 cal yr BP) and (3) Landward mangrove margin (∼770 cal yr BP-Present). A transgressive shift from floodplain freshwater marsh to a tidal flat is recorded between ∼1980–1420 cal yr BP which is evidenced by upland tree taxa, Poaceae, pteridophyte and fungal spores along with low percentage of mangroves such as Avicennia, Sonneratia and Rhizophora representing the landward edge of the tidal region. Dominance of Sonneratia and a decline in terrestrial taxa reflects a rise in the relative sea level around ∼1420 cal yr BP with less freshwater input from land suggesting a weakened monsoon condition. After ∼770 cal yr BP, an overall regressive phase with small cycles of relative sea level rise/fall has been observed due to the dominance of salt tolerant Avicennia along with Rhizophora, Excoecaria agallocha and Aegialitis rotundifolia alternating with Sonneratia and other marine palynomorphs.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 11"},"PeriodicalIF":1.5,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46249803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-16DOI: 10.1080/01916122.2023.2189319
F. Esposito, L. N. Morgado, T. Nunes, C. Rego, Francisco M. Fernandes, M. Boieiro
ABSTRACT This study presents the first palynological characterisation of the five endemic plant genera of the Madeira archipelago: Chamaemeles Lindl, Melanoselinum Hoffm., Monizia Lowe, Musschia Dumort and Sinapidendron Lowe. Pollen grain morphology of ten endemic species was studied using light and scanning electron microscopy techniques. The size and shape of pollen grains, the polar axis, the equatorial diameter, and the exine ornamentation were measured and described. We found that the pollen grains of the five endemic genera are all medium-size monads. The close relative apiaceous Melanoselinum and Monizia differ in polar (P) and equatorial (E) diameter size and exine ornamentation while Sinapidendron species show differences in P, E, and P/E ratios. The pollen grains of the two Musschia species are very similar to each other, but differ in morphology and ornamentation from the Macaronesian endemic bellflowers Azorina vidalii and Canarina canariensis. This study unveiled differences between the endemic taxa and with their close related species, thus providing support to previous taxonomic findings.
{"title":"Pollen Morphology of the Endemic Genera of the Madeira Archipelago, Portugal","authors":"F. Esposito, L. N. Morgado, T. Nunes, C. Rego, Francisco M. Fernandes, M. Boieiro","doi":"10.1080/01916122.2023.2189319","DOIUrl":"https://doi.org/10.1080/01916122.2023.2189319","url":null,"abstract":"ABSTRACT This study presents the first palynological characterisation of the five endemic plant genera of the Madeira archipelago: Chamaemeles Lindl, Melanoselinum Hoffm., Monizia Lowe, Musschia Dumort and Sinapidendron Lowe. Pollen grain morphology of ten endemic species was studied using light and scanning electron microscopy techniques. The size and shape of pollen grains, the polar axis, the equatorial diameter, and the exine ornamentation were measured and described. We found that the pollen grains of the five endemic genera are all medium-size monads. The close relative apiaceous Melanoselinum and Monizia differ in polar (P) and equatorial (E) diameter size and exine ornamentation while Sinapidendron species show differences in P, E, and P/E ratios. The pollen grains of the two Musschia species are very similar to each other, but differ in morphology and ornamentation from the Macaronesian endemic bellflowers Azorina vidalii and Canarina canariensis. This study unveiled differences between the endemic taxa and with their close related species, thus providing support to previous taxonomic findings.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 9"},"PeriodicalIF":1.5,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46770526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-16DOI: 10.1080/01916122.2023.2191257
H. Hooghiemstra
Long continental pollen records (LCPRs) form a remarkable aspect of palynological research. They are rare, mostly collected in multiple coring sessions, due to time constraints they often do not reach the sample resolution anticipated, train the international audience to accept regularly improved age models, and show exciting histories of how ecosystems responded to Quaternary ice-age cycles. LCPRs also offer marine, and icecore studies a framework to explore how marine, ice and land ecosystems are responding to climate change in a mutual interaction. The decennia needed to complete such record is bizarre resulting in pollen records do not match in time with fast results from proxies with automatized procedures. Unfortunately, the development of long pollen records is in practice restricted to palynologists with a long research horizon. New applications of LCPRs have been explored in mountain areas. Sample-resolution steps through the last million years show how the surface of north Andean high mountain vegetation (p aramo) dramatically and repeatedly changed in surface, hinting at evolutionary processes.
{"title":"Making a Long Continental Pollen Record, a Fabulous and Bizarre Enterprise: A 50-year Retrospective","authors":"H. Hooghiemstra","doi":"10.1080/01916122.2023.2191257","DOIUrl":"https://doi.org/10.1080/01916122.2023.2191257","url":null,"abstract":"Long continental pollen records (LCPRs) form a remarkable aspect of palynological research. They are rare, mostly collected in multiple coring sessions, due to time constraints they often do not reach the sample resolution anticipated, train the international audience to accept regularly improved age models, and show exciting histories of how ecosystems responded to Quaternary ice-age cycles. LCPRs also offer marine, and icecore studies a framework to explore how marine, ice and land ecosystems are responding to climate change in a mutual interaction. The decennia needed to complete such record is bizarre resulting in pollen records do not match in time with fast results from proxies with automatized procedures. Unfortunately, the development of long pollen records is in practice restricted to palynologists with a long research horizon. New applications of LCPRs have been explored in mountain areas. Sample-resolution steps through the last million years show how the surface of north Andean high mountain vegetation (p aramo) dramatically and repeatedly changed in surface, hinting at evolutionary processes.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 4"},"PeriodicalIF":1.5,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43964694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-21DOI: 10.1080/01916122.2023.2179679
N. Ndlovu, F. Neumann, M. Henley, R. Cook, C. Reynolds
ABSTRACT In melissopalynological studies, the investigation of pollen composition in honey samples reveals the geographical and botanical origin of the samples and links them to the regional climatic conditions. Honeybees (Apis mellifera), collect pollen and nectar for their nutritional requirements based on the seasonal availability of surrounding flora. In this study, pollen content in honey was temporarily investigated for seasonal differences of the bee foraged plants. A melissopalynological investigation was applied to honey samples harvested from 13 beehives located in the Greater Kruger National Park, South Africa. Multivariate statistics (NMDS and Rarefaction curves) were used to show spatial and temporal clustering of the samples. The melissopalynological data were then compared to the species' flowering season and a botanical survey of the surrounding area. The turnover in pollen composition for different seasons signifies seasonal variation in pollen types. For example, during summer, bees foraged from fewer floral sources. The highest species richness was observed during winter, suggesting a higher dependence on a diversity of floral resources during the driest months. Various seasonal pollen spectra were characterised by a pollen turnover from numerous species, including Combretum type, Sclerocarya birrea, Poaceae, Harpephyllum caffrum and Lannea schweinfurthii but also neophytes such as Medicago sativa. Therefore, honey samples from the Lowveld region in South Africa reflected the seasonal patterns of the surrounding flora although pollen from taxa such as Combretum spp. (average 56%) and Sclerocarya birrea (average 14%) were continuously sought after by bees throughout the year.
{"title":"Melissopalynological Investigations of Seasonal Honey Samples from the Greater Kruger National Park, Savanna Biome of South Africa","authors":"N. Ndlovu, F. Neumann, M. Henley, R. Cook, C. Reynolds","doi":"10.1080/01916122.2023.2179679","DOIUrl":"https://doi.org/10.1080/01916122.2023.2179679","url":null,"abstract":"ABSTRACT In melissopalynological studies, the investigation of pollen composition in honey samples reveals the geographical and botanical origin of the samples and links them to the regional climatic conditions. Honeybees (Apis mellifera), collect pollen and nectar for their nutritional requirements based on the seasonal availability of surrounding flora. In this study, pollen content in honey was temporarily investigated for seasonal differences of the bee foraged plants. A melissopalynological investigation was applied to honey samples harvested from 13 beehives located in the Greater Kruger National Park, South Africa. Multivariate statistics (NMDS and Rarefaction curves) were used to show spatial and temporal clustering of the samples. The melissopalynological data were then compared to the species' flowering season and a botanical survey of the surrounding area. The turnover in pollen composition for different seasons signifies seasonal variation in pollen types. For example, during summer, bees foraged from fewer floral sources. The highest species richness was observed during winter, suggesting a higher dependence on a diversity of floral resources during the driest months. Various seasonal pollen spectra were characterised by a pollen turnover from numerous species, including Combretum type, Sclerocarya birrea, Poaceae, Harpephyllum caffrum and Lannea schweinfurthii but also neophytes such as Medicago sativa. Therefore, honey samples from the Lowveld region in South Africa reflected the seasonal patterns of the surrounding flora although pollen from taxa such as Combretum spp. (average 56%) and Sclerocarya birrea (average 14%) were continuously sought after by bees throughout the year.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 10"},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44909143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-15DOI: 10.1080/01916122.2023.2180100
Marcos Gonçalves Ferreira, Francisco Cildomar da Silva Correia, R. C. Peruquetti, F. R. C. Silva
Abstract The botanical origin and seasonal variation of pollen collected by Tetragonisca weyrauchi were studied by means of palynology (pollen identification). The study was carried out between August 2016 and July 2017 with a hive introduced in a house garden in an urban area (09° 56′ 38.7″ S; 67° 52′ 42.9″ W) near the campus of the Federal University of Acre (UFAC). In total, we identified 87 pollen types from 31 botanical families, with the most representative ones being: Alismataceae, Amaranthaceae, Arecaceae, Boraginaceae, Cyperaceae, Euphorbiaceae, Fabaceae and Urticaceae, all displaying percentages above 10%. The pollen types Alternanthera (Amaranthaceae), Cecropia (Urticaceae) and Cordia sellowiana (Boraginaceae) obtained relative abundances above 90% and are therefore considered events of temporary specialization. The lowest diversity and evenness values were found for July (H′ = 0.127; J′ = 0.071) and August (H′ = 0.070; J′ = 0.043), and the highest values for October (H′ = 2.025; J′ = 0.715) and April (H′ = 1.941; J′ = 0.611), thus not suggesting relationships with the rainy (November–April) or dry (May–October) periods. Furthermore, there was no preference by the bees for morphological characteristics of the pollen such as size, exine texture or aperture number. However, the most representative grains are among the small and medium size, reinforcing the hypothesis that this bee species prefers small flowers available in dense inflorescences.
{"title":"Botanical origin and seasonal variation in pollen collected by Tetragonisca weyrauchi (Apidae: Meliponini) in an urban area of Rio Branco, State of Acre, Brazil","authors":"Marcos Gonçalves Ferreira, Francisco Cildomar da Silva Correia, R. C. Peruquetti, F. R. C. Silva","doi":"10.1080/01916122.2023.2180100","DOIUrl":"https://doi.org/10.1080/01916122.2023.2180100","url":null,"abstract":"Abstract The botanical origin and seasonal variation of pollen collected by Tetragonisca weyrauchi were studied by means of palynology (pollen identification). The study was carried out between August 2016 and July 2017 with a hive introduced in a house garden in an urban area (09° 56′ 38.7″ S; 67° 52′ 42.9″ W) near the campus of the Federal University of Acre (UFAC). In total, we identified 87 pollen types from 31 botanical families, with the most representative ones being: Alismataceae, Amaranthaceae, Arecaceae, Boraginaceae, Cyperaceae, Euphorbiaceae, Fabaceae and Urticaceae, all displaying percentages above 10%. The pollen types Alternanthera (Amaranthaceae), Cecropia (Urticaceae) and Cordia sellowiana (Boraginaceae) obtained relative abundances above 90% and are therefore considered events of temporary specialization. The lowest diversity and evenness values were found for July (H′ = 0.127; J′ = 0.071) and August (H′ = 0.070; J′ = 0.043), and the highest values for October (H′ = 2.025; J′ = 0.715) and April (H′ = 1.941; J′ = 0.611), thus not suggesting relationships with the rainy (November–April) or dry (May–October) periods. Furthermore, there was no preference by the bees for morphological characteristics of the pollen such as size, exine texture or aperture number. However, the most representative grains are among the small and medium size, reinforcing the hypothesis that this bee species prefers small flowers available in dense inflorescences.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48710086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.1080/01916122.2023.2175064
A. A. L. Pimentel, V. H. Abreu, C. Krug, I. Miranda
ABSTRACT Bees of the genus Melipona found in the Amazon are investigated given their ecological, sociocultural and economic importance. The objective of this work was to analyze the scientific literature to recognize patterns in the richness of pollen types foraged by Melipona, comparing four methodological approaches. In the literature review, two databases were consulted: Web of Science (WoS) and the Scientific Electronic Library Online (SciELO). A record of 18 Melipona species investigated in 23 studies was found. These foraged 498 pollen types distributed in 88 botanical families. Many factors affect this richness. The main factor is the sampling time, which can influence other decisions. The highest richness estimates were found in the 12 month studies. The differences between the vegetation types reflect the patterns of diversity naturally found between them. Material from the meliponaries and bee corbels will result in a greater diversity of pollen types. Although there has been an increase in Melipona studies in the Amazon more effort is needed to fill the gaps in this vast territory.
摘要:研究了亚马逊河流域蜜蜂属的生态、社会文化和经济重要性。本研究的目的是分析科学文献，以识别蜜梨草采集花粉类型丰富度的规律，并比较四种方法。在文献综述中，参考了两个数据库:Web of Science (WoS)和Science Electronic Library Online (SciELO)。在23项研究中发现了18种貂鱼的记录。这498种花粉类型分布在88个植物科。影响这种丰富性的因素很多。主要因素是采样时间，它会影响其他决策。在12个月的研究中发现了最高的丰富度估计值。植被类型之间的差异反映了它们之间自然存在的多样性格局。来自蜂冠和蜂冠的物质将导致花粉类型的更大多样性。尽管在亚马逊地区进行的梅利波纳研究有所增加，但要填补这片广袤土地上的空白，还需要付出更多的努力。
{"title":"A Review of Pollen Types Foraged By Melipona in the Brazilian Amazon","authors":"A. A. L. Pimentel, V. H. Abreu, C. Krug, I. Miranda","doi":"10.1080/01916122.2023.2175064","DOIUrl":"https://doi.org/10.1080/01916122.2023.2175064","url":null,"abstract":"ABSTRACT Bees of the genus Melipona found in the Amazon are investigated given their ecological, sociocultural and economic importance. The objective of this work was to analyze the scientific literature to recognize patterns in the richness of pollen types foraged by Melipona, comparing four methodological approaches. In the literature review, two databases were consulted: Web of Science (WoS) and the Scientific Electronic Library Online (SciELO). A record of 18 Melipona species investigated in 23 studies was found. These foraged 498 pollen types distributed in 88 botanical families. Many factors affect this richness. The main factor is the sampling time, which can influence other decisions. The highest richness estimates were found in the 12 month studies. The differences between the vegetation types reflect the patterns of diversity naturally found between them. Material from the meliponaries and bee corbels will result in a greater diversity of pollen types. Although there has been an increase in Melipona studies in the Amazon more effort is needed to fill the gaps in this vast territory.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 10"},"PeriodicalIF":1.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43049584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-05DOI: 10.1080/01916122.2023.2165550
M. Kürşat
ABSTRACT The current study's objective is to infer the specific pollen morphologies of 27 different Euphorbia L. Turkish taxa were cultivated using LM and SEM. Additionally, principal component analysis (PCA) is developed and cluster analysis is used to examine similarity grouping in this study. The results of the current study showed that tricolporate pollen grains are present in 24 different taxa of Euphorbia, whereas three other taxa E. denticulate, E. esula subsp. tommassiniana, and E. orientalis have tricolpate and tricolporate pollen grains. The results of this study also revealed that pollen grains frequently have a perforated pattern. The use of ornamentations with reticulate- and rugulate-perforate surfaces has also been discovered. The current study revealed that six taxa of Euphorbia have prolate-spheroidal pollen shapes, while 20 of the 27 Euphorbia under study have oblate-spheroidal pollen shapes. But only the pollen of E. grisophylla, 1 of the 27 tested Euphorbia taxa, has a subprolate shape. On the other hand, the PCA results explained 92.16% of the variation, and the unweighted pair group method with arithmetic mean (UPGMA) dendrogram identified four taxonomic groupings, as follows: t es 1–4
摘要本研究的目的是利用LM和SEM分析27个不同土耳其大胡属(Euphorbia L. Turkish)类群的花粉形态。此外，本研究还发展了主成分分析(PCA)，并使用聚类分析来检验相似性分组。结果表明，在大戟属植物的24个分类群中存在三聚体花粉粒，而在大戟属植物的3个分类群中存在小齿花粉粒。和东方菊的花粉粒为三柱体和三柱体。本研究结果还揭示了花粉粒经常具有穿孔模式。使用网状和规则穿孔表面的装饰也被发现。本研究发现，大戟属植物中有6个类群花粉形态为长球状，而27个类群中有20个类群花粉形态为扁球状。但是，在27个大戟属分类群中，只有1个大戟属(E. grisophylla)的花粉具有近长形。另一方面，PCA结果解释了92.16%的变异，UPGMA树形图的非加权对群法(unweighted pair group method with arithmetic mean, UPGMA)鉴定出4个分类类群，分别为:1 ~ 4
{"title":"Pollen Morphology of Some Euphorbia Taxa and Its Systematic Significance","authors":"M. Kürşat","doi":"10.1080/01916122.2023.2165550","DOIUrl":"https://doi.org/10.1080/01916122.2023.2165550","url":null,"abstract":"ABSTRACT The current study's objective is to infer the specific pollen morphologies of 27 different Euphorbia L. Turkish taxa were cultivated using LM and SEM. Additionally, principal component analysis (PCA) is developed and cluster analysis is used to examine similarity grouping in this study. The results of the current study showed that tricolporate pollen grains are present in 24 different taxa of Euphorbia, whereas three other taxa E. denticulate, E. esula subsp. tommassiniana, and E. orientalis have tricolpate and tricolporate pollen grains. The results of this study also revealed that pollen grains frequently have a perforated pattern. The use of ornamentations with reticulate- and rugulate-perforate surfaces has also been discovered. The current study revealed that six taxa of Euphorbia have prolate-spheroidal pollen shapes, while 20 of the 27 Euphorbia under study have oblate-spheroidal pollen shapes. But only the pollen of E. grisophylla, 1 of the 27 tested Euphorbia taxa, has a subprolate shape. On the other hand, the PCA results explained 92.16% of the variation, and the unweighted pair group method with arithmetic mean (UPGMA) dendrogram identified four taxonomic groupings, as follows: t es 1–4","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 12"},"PeriodicalIF":1.5,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43005431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.1080/01916122.2022.2163517
Zhiyong Zhang, Dongmei Cheng, Dajun Xie, Zetian Liu, Jian Ni, A. Sun, Yiming Cui, Zhongxin Duan, Qiqi Li
ABSTRACT Previous studies have discovered arboreal pollen in non-forested areas on the Tibetan Plateau, which are mostly anemophilous type and regarded as a result of the Asian summer monsoon. However, the relationship between the spatial distribution of wind-pollinated pollen and monsoon has seldom been illustrated quantitatively. Here, we used 676 surface samples (647 compiled, 29 new samples) to examine the characteristics of the spatial distribution patterns of 13 anemophilous pollen taxa on the southeastern Tibetan Plateau, by employing the spatial interpolation technique. Then, we quantified the correlation between the distributions of these taxa and monsoon wind via Mantel test. The results show that the anemophilous pollen represents at least half percentage of the total pollen assemblages in most areas of the study region. Anemophilous tree pollen mainly distributes in the south and southeastern part, while anemophilous non-tree pollen does in the opposite and perpendicular direction. The distributional pattern of non-anemophilous pollen reflects that their corresponding plants most likely constitute the understory components of different forests or the minorities of non-forests communities. Mantel tests indicate that the anemophilous tree pollen has a highest correlation with the Asian summer monsoon. Anemophilous pollen, overall pollen assemblages and anemophilous pollen with air sacs have higher correlations with summer monsoon. Contrarily, non-anemophilous pollen has relatively weak correlation. Furthermore, we found that the relationships between various pollen groups or separate taxa and the Asian summer monsoon are dependent on sample types. The lake sediment surface samples had the strongest signal of the Asian summer monsoon among the different sample types. Our findings provide the strong evidence of the Asian summer monsoon influencing the pollen distribution patterns. More importantly, the quantification of this correlation between anemophilous tree pollen and the Asian summer monsoon offers the fundamentally theoretical basis of reconstructing paleo-monsoon by the proxy of windborne pollen taxa.
{"title":"Spatial Distribution of Anemophilous Pollen and Its Correlation with the Asian Summer Monsoon on the Southeastern Tibetan Plateau","authors":"Zhiyong Zhang, Dongmei Cheng, Dajun Xie, Zetian Liu, Jian Ni, A. Sun, Yiming Cui, Zhongxin Duan, Qiqi Li","doi":"10.1080/01916122.2022.2163517","DOIUrl":"https://doi.org/10.1080/01916122.2022.2163517","url":null,"abstract":"ABSTRACT Previous studies have discovered arboreal pollen in non-forested areas on the Tibetan Plateau, which are mostly anemophilous type and regarded as a result of the Asian summer monsoon. However, the relationship between the spatial distribution of wind-pollinated pollen and monsoon has seldom been illustrated quantitatively. Here, we used 676 surface samples (647 compiled, 29 new samples) to examine the characteristics of the spatial distribution patterns of 13 anemophilous pollen taxa on the southeastern Tibetan Plateau, by employing the spatial interpolation technique. Then, we quantified the correlation between the distributions of these taxa and monsoon wind via Mantel test. The results show that the anemophilous pollen represents at least half percentage of the total pollen assemblages in most areas of the study region. Anemophilous tree pollen mainly distributes in the south and southeastern part, while anemophilous non-tree pollen does in the opposite and perpendicular direction. The distributional pattern of non-anemophilous pollen reflects that their corresponding plants most likely constitute the understory components of different forests or the minorities of non-forests communities. Mantel tests indicate that the anemophilous tree pollen has a highest correlation with the Asian summer monsoon. Anemophilous pollen, overall pollen assemblages and anemophilous pollen with air sacs have higher correlations with summer monsoon. Contrarily, non-anemophilous pollen has relatively weak correlation. Furthermore, we found that the relationships between various pollen groups or separate taxa and the Asian summer monsoon are dependent on sample types. The lake sediment surface samples had the strongest signal of the Asian summer monsoon among the different sample types. Our findings provide the strong evidence of the Asian summer monsoon influencing the pollen distribution patterns. More importantly, the quantification of this correlation between anemophilous tree pollen and the Asian summer monsoon offers the fundamentally theoretical basis of reconstructing paleo-monsoon by the proxy of windborne pollen taxa.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 11"},"PeriodicalIF":1.5,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44629182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-28DOI: 10.1080/01916122.2022.2163315
Paloma Gaspar Torrati-Guioti, Talita Kely Bellonzi, E. Gasparino
ABSTRACT Forest fragments in the Cerrado are areas of prominent biological importance due to their great species richness and biodiversity. These areas host endemic species of Celastraceae, the knowledge of which contributes to the preservation of this biome. This study aims to characterize the pollen morphology of 10 native species of Celastraceae found in forest fragments in the state of São Paulo, Brazil, contributing to the knowledge of the taxa for future taxonomic studies, and providing data for the conservation of the species in the forest areas. The pollen grains were acetolyzed, measured, described qualitatively and illustrated using light microscopy and scanning electron microscopy. The pollen characters referring to the pollen unit, polarity, type and number of apertures are similar in all the species studied. The shape, amb and exine ornamentation of pollen grains are the diagnostic qualitative morphological data for Celastraceae in this study. Microreticulate pollen grains were observed in Celastrus, Hippocratea and Pristimera; reticulate pollen grains with a very thick exine characterize the analyzed species of Plenckia; and reticulate and microreticulate ornamentation was observed among the species of Monteverdia. The results obtained here allow us to distinguish species of the analyzed genera and confirm the pollen diversity previously reported for Celastraceae.
{"title":"Contribution to Celastraceae Palynology from Cerrado Forest Fragments: A Focus on Shape, Amb and Exine Ornamentation","authors":"Paloma Gaspar Torrati-Guioti, Talita Kely Bellonzi, E. Gasparino","doi":"10.1080/01916122.2022.2163315","DOIUrl":"https://doi.org/10.1080/01916122.2022.2163315","url":null,"abstract":"ABSTRACT Forest fragments in the Cerrado are areas of prominent biological importance due to their great species richness and biodiversity. These areas host endemic species of Celastraceae, the knowledge of which contributes to the preservation of this biome. This study aims to characterize the pollen morphology of 10 native species of Celastraceae found in forest fragments in the state of São Paulo, Brazil, contributing to the knowledge of the taxa for future taxonomic studies, and providing data for the conservation of the species in the forest areas. The pollen grains were acetolyzed, measured, described qualitatively and illustrated using light microscopy and scanning electron microscopy. The pollen characters referring to the pollen unit, polarity, type and number of apertures are similar in all the species studied. The shape, amb and exine ornamentation of pollen grains are the diagnostic qualitative morphological data for Celastraceae in this study. Microreticulate pollen grains were observed in Celastrus, Hippocratea and Pristimera; reticulate pollen grains with a very thick exine characterize the analyzed species of Plenckia; and reticulate and microreticulate ornamentation was observed among the species of Monteverdia. The results obtained here allow us to distinguish species of the analyzed genera and confirm the pollen diversity previously reported for Celastraceae.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 12"},"PeriodicalIF":1.5,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47306659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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