Pub Date : 2023-07-26DOI: 10.1080/01916122.2023.2228365
Zeynep Büşra Erarslan, Ş. Kültür
Abstract The main purpose of this study is the palynological characterization of Doronicum L. taxa that occur naturally in Turkey. In this context, the pollen morphology of 11 species and one subspecies of Doronicum was researched in detail by light microscopy and scanning electron microscopy (SEM). Furthermore, principal component analysis (PCA) and hierarchical cluster analysis (HCA) were carried out to identify closely related species and palynological characters that could potentially be used to distinguish the studied taxa. Pollen grains were found to be isopolar monad and tricolporate. Pollen were prolate-spheroidal in shape, with a circular amb. SEM showed the exine ornamentation was echinate-perforate. Differences in the bases and ends of the spines were observed; therefore, pollen grains were categorized based on spine morphology. Three components of the studied palynological characteristics were determined with PCA. The PCA results explained 78.79% of the variation, and polar diameter, equatorial diameter, diameter in polar view, exine thickness, intine thickness, pore length, colpus width, and spine length were found to be the most valuable palynological characteristics for discrimination of the Doronicum taxa. The HCA dendrogram also revealed three main clusters. This study is helpful for understanding the relationships among the taxa of Doronicum and provides insight for future taxonomic research.
{"title":"Pollen morphology of Doronicum L. (Asteraceae: Senecioneae) from Turkey and its taxonomical implications","authors":"Zeynep Büşra Erarslan, Ş. Kültür","doi":"10.1080/01916122.2023.2228365","DOIUrl":"https://doi.org/10.1080/01916122.2023.2228365","url":null,"abstract":"Abstract The main purpose of this study is the palynological characterization of Doronicum L. taxa that occur naturally in Turkey. In this context, the pollen morphology of 11 species and one subspecies of Doronicum was researched in detail by light microscopy and scanning electron microscopy (SEM). Furthermore, principal component analysis (PCA) and hierarchical cluster analysis (HCA) were carried out to identify closely related species and palynological characters that could potentially be used to distinguish the studied taxa. Pollen grains were found to be isopolar monad and tricolporate. Pollen were prolate-spheroidal in shape, with a circular amb. SEM showed the exine ornamentation was echinate-perforate. Differences in the bases and ends of the spines were observed; therefore, pollen grains were categorized based on spine morphology. Three components of the studied palynological characteristics were determined with PCA. The PCA results explained 78.79% of the variation, and polar diameter, equatorial diameter, diameter in polar view, exine thickness, intine thickness, pore length, colpus width, and spine length were found to be the most valuable palynological characteristics for discrimination of the Doronicum taxa. The HCA dendrogram also revealed three main clusters. This study is helpful for understanding the relationships among the taxa of Doronicum and provides insight for future taxonomic research.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42224096","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 : 2023-07-04DOI: 10.1080/01916122.2023.2233586
Z. Tsymbalyuk, L. Nitsenko, S. Mosyakin
Abstract Based on molecular phylogenetic and morphological studies, the new genera Sedobassia Freitag & G. Kadereit and Spirobassia Freitag & G. Kadereit were described in the tribe Camphorosmeae (Chenopodiaceae/Amaranthaceae sensu APG IV). Palynomorphological peculiarities are often used in taxonomy as additional diagnostic features. Pollen grains from 26 herbarium specimens belonging to 13 taxa of Bassia, Sedobassia, Spirobassia and Neokochia genera in Eurasia and North America were acetolyzed and studied using both light microscopy and scanning electron microscopy. Dry pollen grains were also studied. The structure of the columellae of pollen grains was analyzed for the first time in the current study. The aim of this research was to provide data on their pollen characteristics and to evaluate the taxonomic value of these data for generic and species-specific identification. The pollen grains are pantoporate, spheroidal in shape, circular in outline, slightly undulate, undulate or straight on the edges; and medium- or small-sized. Pores are circular, with distinct or indistinct margins. Exine sculpture is nanoechinate; tectum psilate or psilate-perforate. Pore membranes with nanoechini. Taxonomic relevance of the most important characters of pollen grains is discussed (pollen diameter, pore number, pore diameter, distance between pores and between pore centers, pollen diameter(C)/distance between pore centers(D) value, nanoechini density, presenсe/absence of perforations, structure of columellae, number of nanoechini on pore membranes). Pollen morphology proved to be an important additional source of information for species-specific identification. This study provides new data and analyzes the morphological features of pollen grains of Bassia (in the currently accepted circumscription), palynomorphological similarities, and differences between taxa of the genera Bassia, Sedobassia, Spirobassia, and Neokochia.
{"title":"Taxonomic significance of pollen morphology of selected taxa of Bassia, Sedobassia, Spirobassia and Neokochia (Chenopodiaceae/Amaranthaceae sensu APG IV)","authors":"Z. Tsymbalyuk, L. Nitsenko, S. Mosyakin","doi":"10.1080/01916122.2023.2233586","DOIUrl":"https://doi.org/10.1080/01916122.2023.2233586","url":null,"abstract":"Abstract Based on molecular phylogenetic and morphological studies, the new genera Sedobassia Freitag & G. Kadereit and Spirobassia Freitag & G. Kadereit were described in the tribe Camphorosmeae (Chenopodiaceae/Amaranthaceae sensu APG IV). Palynomorphological peculiarities are often used in taxonomy as additional diagnostic features. Pollen grains from 26 herbarium specimens belonging to 13 taxa of Bassia, Sedobassia, Spirobassia and Neokochia genera in Eurasia and North America were acetolyzed and studied using both light microscopy and scanning electron microscopy. Dry pollen grains were also studied. The structure of the columellae of pollen grains was analyzed for the first time in the current study. The aim of this research was to provide data on their pollen characteristics and to evaluate the taxonomic value of these data for generic and species-specific identification. The pollen grains are pantoporate, spheroidal in shape, circular in outline, slightly undulate, undulate or straight on the edges; and medium- or small-sized. Pores are circular, with distinct or indistinct margins. Exine sculpture is nanoechinate; tectum psilate or psilate-perforate. Pore membranes with nanoechini. Taxonomic relevance of the most important characters of pollen grains is discussed (pollen diameter, pore number, pore diameter, distance between pores and between pore centers, pollen diameter(C)/distance between pore centers(D) value, nanoechini density, presenсe/absence of perforations, structure of columellae, number of nanoechini on pore membranes). Pollen morphology proved to be an important additional source of information for species-specific identification. This study provides new data and analyzes the morphological features of pollen grains of Bassia (in the currently accepted circumscription), palynomorphological similarities, and differences between taxa of the genera Bassia, Sedobassia, Spirobassia, and Neokochia.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45099728","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 : 2023-07-03DOI: 10.1080/01916122.2023.2230017
J. Riding
als 1959 das 1. deutschsprachige Lehrbuch der Ergotherapie Besch ftigungstherapie – Einf hrung und Grundlagen im Georg Thieme Verlag erschien, war dies ein Meilenstein f r diesen noch jungen Beruf. Damals ging es darum, f r die 1. geregelte besch ftigungstherapeutische Ausbildung mit staatlicher Anerkennung eine Grundlage f r den systematischen Wissenserwerb zu schaffen. Bis in die 90er-Jahre sollte dieses 3-mal aktualisierte Buch f r Generationen von Ergotherapeuten das einschl gige ergotherapeutische Grundlagenwerk bleiben.
{"title":"Please Write Obituaries for Your Palynological Heroes","authors":"J. Riding","doi":"10.1080/01916122.2023.2230017","DOIUrl":"https://doi.org/10.1080/01916122.2023.2230017","url":null,"abstract":"als 1959 das 1. deutschsprachige Lehrbuch der Ergotherapie Besch ftigungstherapie – Einf hrung und Grundlagen im Georg Thieme Verlag erschien, war dies ein Meilenstein f r diesen noch jungen Beruf. Damals ging es darum, f r die 1. geregelte besch ftigungstherapeutische Ausbildung mit staatlicher Anerkennung eine Grundlage f r den systematischen Wissenserwerb zu schaffen. Bis in die 90er-Jahre sollte dieses 3-mal aktualisierte Buch f r Generationen von Ergotherapeuten das einschl gige ergotherapeutische Grundlagenwerk bleiben.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 3"},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45946786","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 : 2023-06-12DOI: 10.1080/01916122.2023.2221303
Dalong Li, Xiaoou Zhai, Liwei Sun, Xing Ji, Sijia Zhang, Yujiao Zhang, Wenxiu Shen, Hui Zhang, Feng Qian, Huimin Liu
Abstract Due to extensive introduction and breeding, the taxonomic relationships of Lonicera L. are unclear. Alternative scientific methods are needed to explore the classification of these new Lonicera. In this paper, the pollen morphology characteristics, karyotype features, and floral and fruit pigment components of 13 taxa of Lonicera were analyzed by means of scanning electron microscopy, karyotype analysis, High Performance Liquid Chromatography Mass Spectrometry (HPLC-MS) and Gas Chromatography-Mass Spectrometry (GC-MS). The 13 representatives of Lonicera were divided into groups of four, three, three and three taxa through the analysis of pollen morphology characteristics, karyotype features, floral composition and fruit pigment composition, respectively. Lonicera ruprechtiana and Lonicera tatarica always clustered together. Five hybrids, including Lonicera korolkow × Lonicera maackii and Lonicera korolkow × Lonicera tatarica No. 8 can generally be clustered with their parents. These results indicate that the analysis of pollen morphology characteristics, karyotype features, and floral and fruit pigment composition has value and significance for the study of systematic classification and relationships, and the conclusions of this study partially support morphological taxonomy.
{"title":"A taxonomic study on pollen morphology, karyotype features, floral and fruit pigment components of 13 taxa of Lonicera L.","authors":"Dalong Li, Xiaoou Zhai, Liwei Sun, Xing Ji, Sijia Zhang, Yujiao Zhang, Wenxiu Shen, Hui Zhang, Feng Qian, Huimin Liu","doi":"10.1080/01916122.2023.2221303","DOIUrl":"https://doi.org/10.1080/01916122.2023.2221303","url":null,"abstract":"Abstract Due to extensive introduction and breeding, the taxonomic relationships of Lonicera L. are unclear. Alternative scientific methods are needed to explore the classification of these new Lonicera. In this paper, the pollen morphology characteristics, karyotype features, and floral and fruit pigment components of 13 taxa of Lonicera were analyzed by means of scanning electron microscopy, karyotype analysis, High Performance Liquid Chromatography Mass Spectrometry (HPLC-MS) and Gas Chromatography-Mass Spectrometry (GC-MS). The 13 representatives of Lonicera were divided into groups of four, three, three and three taxa through the analysis of pollen morphology characteristics, karyotype features, floral composition and fruit pigment composition, respectively. Lonicera ruprechtiana and Lonicera tatarica always clustered together. Five hybrids, including Lonicera korolkow × Lonicera maackii and Lonicera korolkow × Lonicera tatarica No. 8 can generally be clustered with their parents. These results indicate that the analysis of pollen morphology characteristics, karyotype features, and floral and fruit pigment composition has value and significance for the study of systematic classification and relationships, and the conclusions of this study partially support morphological taxonomy.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42038176","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 : 2023-05-22DOI: 10.1080/01916122.2023.2215290
A. Córdova-Rodríguez, A. A. Aragón-Moreno, G. Islebe, N. Torrescano-Valle
Abstract Apiculture is an important economic activity in Mexico, and deforestation, extensive agriculture, and other types of land use threaten sustainable honey production. This study aimed to determine the floral resources used by Apis mellifera for honey production, in vegetation types with different disturbance degrees in Southern Yucatan Peninsula, Quintana Roo state. A total of 24 honey samples, from eight apiaries, were collected during the months of the highest honey production in the region (February to May 2022). Standard acetolysis technique was applied for melissopalynological analysis. A total of 68 pollen types were identified. Our results suggest that the disturbance degree of the vegetation does not affect the pollen diversity and honey composition, mainly because the available floral resources remain similar. Viguiera dentata (Asteraceae) was the most abundant (>45%) herbaceous species in honey samples of February and March. Piscidia piscipula (Fabaceae) and Haematoxylum campechianum (Fabaceae) in samples of March (16%-45%), and P. piscipula in April (>45%). Spondias mombin (Anacardiaceae), Bursera simaruba (Burseraceae), and Metopium brownie (Anacardiaceae) were the most abundant (16%-45%) arboreal species found in samples of May. Although our results can be used to develop conservation strategies looking for sustainable honey production, further studies should focus on vegetation with a better conservation state, during longer time periods, and during periods with fewer resources available for honeybees.
{"title":"Botanical characterization of Apis mellifera honeys in areas under different degrees of disturbance in the southern Yucatan Peninsula, Mexico","authors":"A. Córdova-Rodríguez, A. A. Aragón-Moreno, G. Islebe, N. Torrescano-Valle","doi":"10.1080/01916122.2023.2215290","DOIUrl":"https://doi.org/10.1080/01916122.2023.2215290","url":null,"abstract":"Abstract Apiculture is an important economic activity in Mexico, and deforestation, extensive agriculture, and other types of land use threaten sustainable honey production. This study aimed to determine the floral resources used by Apis mellifera for honey production, in vegetation types with different disturbance degrees in Southern Yucatan Peninsula, Quintana Roo state. A total of 24 honey samples, from eight apiaries, were collected during the months of the highest honey production in the region (February to May 2022). Standard acetolysis technique was applied for melissopalynological analysis. A total of 68 pollen types were identified. Our results suggest that the disturbance degree of the vegetation does not affect the pollen diversity and honey composition, mainly because the available floral resources remain similar. Viguiera dentata (Asteraceae) was the most abundant (>45%) herbaceous species in honey samples of February and March. Piscidia piscipula (Fabaceae) and Haematoxylum campechianum (Fabaceae) in samples of March (16%-45%), and P. piscipula in April (>45%). Spondias mombin (Anacardiaceae), Bursera simaruba (Burseraceae), and Metopium brownie (Anacardiaceae) were the most abundant (16%-45%) arboreal species found in samples of May. Although our results can be used to develop conservation strategies looking for sustainable honey production, further studies should focus on vegetation with a better conservation state, during longer time periods, and during periods with fewer resources available for honeybees.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45156496","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 : 2023-05-15DOI: 10.1080/01916122.2023.2214191
M. Ghavidel-syooki, Mohammad Hossein Piri-Kangarshahi
ABSTRACT The Lashkarak Formation (Lower–Middle Ordovician) in the Gerdkuh locality, 10 km west of Damghan city, northern Iran, has been found to contain acritarchs and chitinozoans. This study aimed to understand these chitinozoan and acritarch successions as well as brachiopods in this part of the Alborz Mountains, in a novel manner. Ninety-seven surface samples from this succession were collected and analysed. Thirty samples yielded well-preserved palynomorph taxa such as acritarchs, chitinozoans, and scolecodonts, as well as graptolite remains. In total, 53 taxa were identified among the acritarchs (38 species belonging to 21 genera) and chitinozoans (15 species belonging to 10 genera). Although scolecodonts and graptolite remains were also observed, they were not studied in detail. The palynological analyses revealed the presence of several diagnostic acritarchs in the Lashkarak Formation, including Vulcanisphaera simplex, Arbusculidium filamentosum, Coryphidium bohemicum, Dactylofusa velifera, Striatotheca mutua, Arkonia virgata, and Orthosphaeridium ternatum. These acritarchs allowed the recognition of five acritarch assemblage zones. Similarly, seven chitinozoan biozones were recognised: Eremochitina brevis, Desmochitina ornensis, Belonechitina henryi, Cyathochitina protocalix, Cyathochitina calix, Siphonochitina formosa, and Laufeldochitina clavata. These findings confirm the inclusion of the Alborz Mountains in the peri-Gondwana palaeoprovince during the Early–Middle Ordovician. The co-occurrence of the acritarch and chitinozoan taxa with previously identified brachiopods allowed for the establishment of a more detailed Early–Middle Ordovician biozonation, demonstrating their potential usefulness for global chronostratigraphy. Based on palynological and brachiopod assemblages, a shallow marine inner shelf setting is suggested for the Early–Middle Ordovician at the Gerdkuh locality. Moreover, in this study, four new morphotype species were erected, consisting of one new chitinozoan (Cyathochitina gerdkuhensis sp. nov.) and three new acritarchs (Baltisphaeridium razii sp. nov., Navifusa alborzensis sp. nov., and Orthosphaeridium iranense sp. nov.). However, Othosphaeridium cf. ternatum was left in open nomenclature. HIGHLIGHTS Palynomorphs from the Lower–Middle Ordovician (Lashkarak Formation) were recorded from the Alborz Mountains. 15 chitinozoan s ecies (10 enera) were recorded from the Lashkarak Formation S Cas ian Sea 38 acritarch taxa (21 genera) were identified, indicating the N. Gondwanan Domain. The diagnostic acritarch taxa are Arbusculidium, Coryphidium, Striatotheca, and Arkonia. Chitinozoan biozones are E. brevis D. ornensis B. henryi C. protocalix C. calix S. formosa and L. clavata. Baltisphaeridium razii sp. nov., Navifusa alborzensis sp. nov., Cyathochitina gerdkuhensis sp. nov., and Orthosphaeridium iranense sp nov is recorded for the first time A major hiatus corresponds to the Late Ordovician Silurian and Early–Middle De
{"title":"Peri-Gondwanan Acritarchs and Chitinozoans from the Lower–Middle Ordovician Lashkarak Formation in the Alborz Mountain Ranges, Northern Iran: Regional Stratigraphical Significance and Palaeogeographical Implications","authors":"M. Ghavidel-syooki, Mohammad Hossein Piri-Kangarshahi","doi":"10.1080/01916122.2023.2214191","DOIUrl":"https://doi.org/10.1080/01916122.2023.2214191","url":null,"abstract":"ABSTRACT The Lashkarak Formation (Lower–Middle Ordovician) in the Gerdkuh locality, 10 km west of Damghan city, northern Iran, has been found to contain acritarchs and chitinozoans. This study aimed to understand these chitinozoan and acritarch successions as well as brachiopods in this part of the Alborz Mountains, in a novel manner. Ninety-seven surface samples from this succession were collected and analysed. Thirty samples yielded well-preserved palynomorph taxa such as acritarchs, chitinozoans, and scolecodonts, as well as graptolite remains. In total, 53 taxa were identified among the acritarchs (38 species belonging to 21 genera) and chitinozoans (15 species belonging to 10 genera). Although scolecodonts and graptolite remains were also observed, they were not studied in detail. The palynological analyses revealed the presence of several diagnostic acritarchs in the Lashkarak Formation, including Vulcanisphaera simplex, Arbusculidium filamentosum, Coryphidium bohemicum, Dactylofusa velifera, Striatotheca mutua, Arkonia virgata, and Orthosphaeridium ternatum. These acritarchs allowed the recognition of five acritarch assemblage zones. Similarly, seven chitinozoan biozones were recognised: Eremochitina brevis, Desmochitina ornensis, Belonechitina henryi, Cyathochitina protocalix, Cyathochitina calix, Siphonochitina formosa, and Laufeldochitina clavata. These findings confirm the inclusion of the Alborz Mountains in the peri-Gondwana palaeoprovince during the Early–Middle Ordovician. The co-occurrence of the acritarch and chitinozoan taxa with previously identified brachiopods allowed for the establishment of a more detailed Early–Middle Ordovician biozonation, demonstrating their potential usefulness for global chronostratigraphy. Based on palynological and brachiopod assemblages, a shallow marine inner shelf setting is suggested for the Early–Middle Ordovician at the Gerdkuh locality. Moreover, in this study, four new morphotype species were erected, consisting of one new chitinozoan (Cyathochitina gerdkuhensis sp. nov.) and three new acritarchs (Baltisphaeridium razii sp. nov., Navifusa alborzensis sp. nov., and Orthosphaeridium iranense sp. nov.). However, Othosphaeridium cf. ternatum was left in open nomenclature. HIGHLIGHTS Palynomorphs from the Lower–Middle Ordovician (Lashkarak Formation) were recorded from the Alborz Mountains. 15 chitinozoan s ecies (10 enera) were recorded from the Lashkarak Formation S Cas ian Sea 38 acritarch taxa (21 genera) were identified, indicating the N. Gondwanan Domain. The diagnostic acritarch taxa are Arbusculidium, Coryphidium, Striatotheca, and Arkonia. Chitinozoan biozones are E. brevis D. ornensis B. henryi C. protocalix C. calix S. formosa and L. clavata. Baltisphaeridium razii sp. nov., Navifusa alborzensis sp. nov., Cyathochitina gerdkuhensis sp. nov., and Orthosphaeridium iranense sp nov is recorded for the first time A major hiatus corresponds to the Late Ordovician Silurian and Early–Middle De","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 34"},"PeriodicalIF":1.5,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43985936","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 : 2023-05-11DOI: 10.1080/01916122.2023.2212276
S. Fuentes
ABSTRACT The present work documents the stratigraphic distribution of dinoflagellate cysts from the upper part (60–585 m) of the YPF.Ch. PV. es-1 borehole, Península Valdés, Argentina. The assemblages exhibit a relatively moderate to low diversity. Most samples are characterized by frequent to abundant taxa of the order Gonyaulacales, such as Spiniferites/Achomosphaera spp., Reticulatosphaera actinocoronata, Operculodinium centrocarpum, and Melitasphaeridium choanophorum. Furthermore, a continuous succession of Early Miocene–Late Miocene diagnostic dinoflagellate cyst events was recorded for the first time from the Península Valdés region. Eight diagnostic events of highest occurrences (HOs) of dinoflagellate cyst taxa are identified. These bioevents allowed a subdivision of the sedimentary succession into two well-defined stratigraphic sections: Early to Middle Miocene (Burdigalian–Langhian/probably Serravalian, 430/425–330/325 m) based on the HOs of Emmetrocysta urnaformis, Cannosphaeropsis quattrocchiae, Cousteaudinium auybriae, and Cleistosphaeridium ancyreum, and Late Miocene (Tortonian–Messinian, between 175–170 and 80/85 m) based on the HOs of Labyrinthodinium truncatum subsp. truncatum, Operculodinium piaseckii, and Reticulatosphaera actinocoronata. The ranges of these taxa are compared with well-documented information on Neogene dinoflagellate cysts recorded from different sites across the North and South Atlantic Ocean and adjacent seas. In general, the dinoflagellate cyst assemblages, as well as the selected diagnostic taxa, exhibit a clear similarity to those of the Northern Hemisphere. The only exception is Hystrichokolpoma rigaudiae, which is asynchronous, possibly indicating local paleoenvironmental conditions.
{"title":"Miocene Dinoflagellate Cyst Biostratigraphy of the Península Valdés, Patagonia, Argentina","authors":"S. Fuentes","doi":"10.1080/01916122.2023.2212276","DOIUrl":"https://doi.org/10.1080/01916122.2023.2212276","url":null,"abstract":"ABSTRACT The present work documents the stratigraphic distribution of dinoflagellate cysts from the upper part (60–585 m) of the YPF.Ch. PV. es-1 borehole, Península Valdés, Argentina. The assemblages exhibit a relatively moderate to low diversity. Most samples are characterized by frequent to abundant taxa of the order Gonyaulacales, such as Spiniferites/Achomosphaera spp., Reticulatosphaera actinocoronata, Operculodinium centrocarpum, and Melitasphaeridium choanophorum. Furthermore, a continuous succession of Early Miocene–Late Miocene diagnostic dinoflagellate cyst events was recorded for the first time from the Península Valdés region. Eight diagnostic events of highest occurrences (HOs) of dinoflagellate cyst taxa are identified. These bioevents allowed a subdivision of the sedimentary succession into two well-defined stratigraphic sections: Early to Middle Miocene (Burdigalian–Langhian/probably Serravalian, 430/425–330/325 m) based on the HOs of Emmetrocysta urnaformis, Cannosphaeropsis quattrocchiae, Cousteaudinium auybriae, and Cleistosphaeridium ancyreum, and Late Miocene (Tortonian–Messinian, between 175–170 and 80/85 m) based on the HOs of Labyrinthodinium truncatum subsp. truncatum, Operculodinium piaseckii, and Reticulatosphaera actinocoronata. The ranges of these taxa are compared with well-documented information on Neogene dinoflagellate cysts recorded from different sites across the North and South Atlantic Ocean and adjacent seas. In general, the dinoflagellate cyst assemblages, as well as the selected diagnostic taxa, exhibit a clear similarity to those of the Northern Hemisphere. The only exception is Hystrichokolpoma rigaudiae, which is asynchronous, possibly indicating local paleoenvironmental conditions.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 15"},"PeriodicalIF":1.5,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47973889","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 : 2023-05-08DOI: 10.1080/01916122.2023.2211148
Mehdi Heidarian, M. A. Nematian, S. Masoumi
ABSTRACT Pollen micromorphology and sporoderm ultrastructure of 10 species of the genus Gagea sensu lato (including Lloydia) were examined by light microscopy, scanning electron microscopy, and transmission electron microscopy. The results showed variation in all quantitative characters of pollen micromorphology. In terms of qualitative characters, oblate pollen shape and two pollen types (medium and large) were seen. Exine ornamentation of the equatorial surface differed from that of the sulcus margin region. Intine ornamentation in the sulcus region was similar in all taxa. Furthermore, the situation of the furrow among cristates and granulates in muri differed, as did the lumina connections. The qualitative and quantitative characters of the pollen sporoderm, such as the presence or absence of endexine, number of intine layers in the sulcus region, and sporoderm thickness, also varied. A dendrogram of all qualitative and quantitative palynological characters, created by the unweighted pair group method with arithmetic mean (UPGMA) based on Euclidean distances, identified six pollen types. Palynological types strongly supported the transfer of Lloydia to Gagea. However, the palynological dendrogram did not support reducing the number of sections in these taxa. A dichotomous key is also presented based on pollen micromorphology and ultrastructure.
{"title":"Taxonomic Notes of the Genus Gagea sensu lato Including Lloydia Based on Palynological Features","authors":"Mehdi Heidarian, M. A. Nematian, S. Masoumi","doi":"10.1080/01916122.2023.2211148","DOIUrl":"https://doi.org/10.1080/01916122.2023.2211148","url":null,"abstract":"ABSTRACT Pollen micromorphology and sporoderm ultrastructure of 10 species of the genus Gagea sensu lato (including Lloydia) were examined by light microscopy, scanning electron microscopy, and transmission electron microscopy. The results showed variation in all quantitative characters of pollen micromorphology. In terms of qualitative characters, oblate pollen shape and two pollen types (medium and large) were seen. Exine ornamentation of the equatorial surface differed from that of the sulcus margin region. Intine ornamentation in the sulcus region was similar in all taxa. Furthermore, the situation of the furrow among cristates and granulates in muri differed, as did the lumina connections. The qualitative and quantitative characters of the pollen sporoderm, such as the presence or absence of endexine, number of intine layers in the sulcus region, and sporoderm thickness, also varied. A dendrogram of all qualitative and quantitative palynological characters, created by the unweighted pair group method with arithmetic mean (UPGMA) based on Euclidean distances, identified six pollen types. Palynological types strongly supported the transfer of Lloydia to Gagea. However, the palynological dendrogram did not support reducing the number of sections in these taxa. A dichotomous key is also presented based on pollen micromorphology and ultrastructure.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 23"},"PeriodicalIF":1.5,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43034619","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 : 2023-05-04DOI: 10.1080/01916122.2023.2209621
F. Rich, F. Pirkle
Abstract The genus Castanea, divided into seven extant species of trees worldwide, includes the American chestnut, C. dentata. This once common North American tree has been nearly eliminated from the landscape due to the appearance of chestnut blight early in the Twentieth Century. Castanea has a long history as a component of palynological assemblages, though megafossil paleobotanical remains are quite rare. The distributions of what are believed to be Castanea pollen as they have been derived from coastal plain and near-shore sediments dating back to the Neogene of the coastal plain of the southeastern US are discussed. The abundances of Castanea pollen in microfossil preparations are carefully considered relative to the concept of ‘pollen sum’ and while it appears that the trees were quite abundant as components of coastal woodlands during the Neogene, the actual number of pollen we found in samples is quite low. American chestnut trees continued to be important into the late Pleistocene and through the time when humans first occupied both coastal and inland areas of the southeastern US.
{"title":"The Neogene-Quaternary palynological record of Castanea in the American southeast","authors":"F. Rich, F. Pirkle","doi":"10.1080/01916122.2023.2209621","DOIUrl":"https://doi.org/10.1080/01916122.2023.2209621","url":null,"abstract":"Abstract The genus Castanea, divided into seven extant species of trees worldwide, includes the American chestnut, C. dentata. This once common North American tree has been nearly eliminated from the landscape due to the appearance of chestnut blight early in the Twentieth Century. Castanea has a long history as a component of palynological assemblages, though megafossil paleobotanical remains are quite rare. The distributions of what are believed to be Castanea pollen as they have been derived from coastal plain and near-shore sediments dating back to the Neogene of the coastal plain of the southeastern US are discussed. The abundances of Castanea pollen in microfossil preparations are carefully considered relative to the concept of ‘pollen sum’ and while it appears that the trees were quite abundant as components of coastal woodlands during the Neogene, the actual number of pollen we found in samples is quite low. American chestnut trees continued to be important into the late Pleistocene and through the time when humans first occupied both coastal and inland areas of the southeastern US.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45557331","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 : 2023-04-07DOI: 10.1080/01916122.2023.2200525
L. Mander, C. Jaramillo, F. Oboh-Ikuenobe
ABSTRACT Fossil pollen and spores are a vital source of information on the geological history of tropical vegetation including reconstructions of vegetation diversity and composition. However, such work relies on a sound taxonomic framework, and this is challenging to achieve because of the large number of pollen and spore morphotypes that are encountered in palynological preparations from tropical sediments. In tropical West Africa, for example, extensive taxonomic work on Cretaceous–Paleogene pollen and spores was undertaken in the later part of the twentieth century, but more recent palynological work has focussed on stratigraphy and basin evolution, and there is a need for additional taxonomic work on the pollen and spores of this region. We have undertaken a descriptive systematic study of pollen and spores (sporomorphs) from 15 sediment samples spanning the Upper Palaeocene–Lower Eocene of south-eastern Nigeria. A palynoflora consisting of 29 spores, two gymnosperm pollen grains, and 138 angiosperm pollen grains is described. Two new spore species are proposed, and one new genus and 18 new species of angiosperm pollen are proposed. The general vegetation type represented by the palynoflora consists of palm-dominated swamps, perhaps with mangroves. The richness of each sample ranges from 29 to 76 sporomorph taxa, and rarefaction analysis suggests an increase in diversity from the Palaeocene to the Eocene in this region. Samples from the Palaeocene Upper Nsukka Formation are dominated by pollen with botanical affinities to the Arecaceae (palms) and Araceae (arums), and this assemblage is very similar to the Palaeocene in the Neotropics.
{"title":"Descriptive Systematics of Upper Palaeocene–Lower Eocene pollen and Spores from the Northern Niger Delta, South-Eastern Nigeria","authors":"L. Mander, C. Jaramillo, F. Oboh-Ikuenobe","doi":"10.1080/01916122.2023.2200525","DOIUrl":"https://doi.org/10.1080/01916122.2023.2200525","url":null,"abstract":"ABSTRACT Fossil pollen and spores are a vital source of information on the geological history of tropical vegetation including reconstructions of vegetation diversity and composition. However, such work relies on a sound taxonomic framework, and this is challenging to achieve because of the large number of pollen and spore morphotypes that are encountered in palynological preparations from tropical sediments. In tropical West Africa, for example, extensive taxonomic work on Cretaceous–Paleogene pollen and spores was undertaken in the later part of the twentieth century, but more recent palynological work has focussed on stratigraphy and basin evolution, and there is a need for additional taxonomic work on the pollen and spores of this region. We have undertaken a descriptive systematic study of pollen and spores (sporomorphs) from 15 sediment samples spanning the Upper Palaeocene–Lower Eocene of south-eastern Nigeria. A palynoflora consisting of 29 spores, two gymnosperm pollen grains, and 138 angiosperm pollen grains is described. Two new spore species are proposed, and one new genus and 18 new species of angiosperm pollen are proposed. The general vegetation type represented by the palynoflora consists of palm-dominated swamps, perhaps with mangroves. The richness of each sample ranges from 29 to 76 sporomorph taxa, and rarefaction analysis suggests an increase in diversity from the Palaeocene to the Eocene in this region. Samples from the Palaeocene Upper Nsukka Formation are dominated by pollen with botanical affinities to the Arecaceae (palms) and Araceae (arums), and this assemblage is very similar to the Palaeocene in the Neotropics.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 59"},"PeriodicalIF":1.5,"publicationDate":"2023-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42905770","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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