Pub Date : 2021-04-19DOI: 10.1080/00173134.2021.1874512
A. R. Simões, Ponprom Pisuttimarn, C. D. da Luz, C. Furness, P. Pornpongrungrueng, L. Chatrou
Abstract Decalobanthus is a genus of woody climbers of Convolvulaceae, recently expanded from a monotypic genus to including 17 species, mainly distributed in Asia and the Pacific. Despite the monophyly and the strong morphological and geographical coherence of the genus, only five of its species have been sampled in a molecular phylogenetic study and their relationships remain poorly understood. As a pillar to further systematic and evolutionary studies of Decalobanthus, this study offers a full characterisation of its pollen variation. To date, only seven of the 17 species have been palynologically documented in the literature (as Merremia s.l.). We here offer new data for seven species, which adding up to the already available data, totals a characterisation of 14 out of the 17 species in the genus. The pollen of Decalobanthus is, in most cases, tricolpate, with one species presenting hexapantocolpate polymorphism, which could suggest di/polyploidy; the presence of a reticulate exine (‘reticulum cristatum’ type) is remarkable, in Convolvulaceae only known otherwise in some species of Cuscuta.
{"title":"Palynological characterization of the Southeast Asian woody climbers Decalobanthus Ooststr. (Convolvulaceae)","authors":"A. R. Simões, Ponprom Pisuttimarn, C. D. da Luz, C. Furness, P. Pornpongrungrueng, L. Chatrou","doi":"10.1080/00173134.2021.1874512","DOIUrl":"https://doi.org/10.1080/00173134.2021.1874512","url":null,"abstract":"Abstract Decalobanthus is a genus of woody climbers of Convolvulaceae, recently expanded from a monotypic genus to including 17 species, mainly distributed in Asia and the Pacific. Despite the monophyly and the strong morphological and geographical coherence of the genus, only five of its species have been sampled in a molecular phylogenetic study and their relationships remain poorly understood. As a pillar to further systematic and evolutionary studies of Decalobanthus, this study offers a full characterisation of its pollen variation. To date, only seven of the 17 species have been palynologically documented in the literature (as Merremia s.l.). We here offer new data for seven species, which adding up to the already available data, totals a characterisation of 14 out of the 17 species in the genus. The pollen of Decalobanthus is, in most cases, tricolpate, with one species presenting hexapantocolpate polymorphism, which could suggest di/polyploidy; the presence of a reticulate exine (‘reticulum cristatum’ type) is remarkable, in Convolvulaceae only known otherwise in some species of Cuscuta.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2021.1874512","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44576550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-30DOI: 10.1080/00173134.2021.1880629
M. García, Nora J. F. Reyes, María L. Espeche, M. Ordano, César M. Lamelas, J. D. Forciniti, Maria Lorena Soulé Gómez
Abstract Knowledge about variations in allergenic pollen in the atmosphere is essential for human health programmes. This study aims to evaluate the influence of climatic variability on the arboreal pollen (AP) load, considering the annual, seasonal and intra-diurnal variability during ten years. We obtain data using a volumetric Burkard spore trap in San Miguel de Tucumán city. The seasonal behaviour of AP showed a short and intense flowering period from August to October. However, annual pollen concentrations varied considerably with 2008 and 2012 the years with the lowest and highest pollen contributions, respectively. The qualitative composition of the AP was represented mainly by Broussonetia papyrifera, Morus, Celtis, Alnus, Platanus, Fraxinus, Myrtaceae, Juglans and Salix. During the ten years of continuous sampling, there was little variation in the pollen concentration per hour. The lowest and highest contribution occurred at 2 p.m., and 2 a.m., respectively. There was a strong seasonal effect on AP concentration. Air temperature positively affected AP concentrations, while air humidity negatively affected AP concentrations. Overall, the shape and intensity of the seasonal AP pattern in this region appears to be driven by long-term phenological dynamics.
{"title":"Strong seasonal effects and long-term weather-related factors drive the temporal variability of airborne pollen in the atmosphere of San Miguel de Tucumán, Argentina","authors":"M. García, Nora J. F. Reyes, María L. Espeche, M. Ordano, César M. Lamelas, J. D. Forciniti, Maria Lorena Soulé Gómez","doi":"10.1080/00173134.2021.1880629","DOIUrl":"https://doi.org/10.1080/00173134.2021.1880629","url":null,"abstract":"Abstract Knowledge about variations in allergenic pollen in the atmosphere is essential for human health programmes. This study aims to evaluate the influence of climatic variability on the arboreal pollen (AP) load, considering the annual, seasonal and intra-diurnal variability during ten years. We obtain data using a volumetric Burkard spore trap in San Miguel de Tucumán city. The seasonal behaviour of AP showed a short and intense flowering period from August to October. However, annual pollen concentrations varied considerably with 2008 and 2012 the years with the lowest and highest pollen contributions, respectively. The qualitative composition of the AP was represented mainly by Broussonetia papyrifera, Morus, Celtis, Alnus, Platanus, Fraxinus, Myrtaceae, Juglans and Salix. During the ten years of continuous sampling, there was little variation in the pollen concentration per hour. The lowest and highest contribution occurred at 2 p.m., and 2 a.m., respectively. There was a strong seasonal effect on AP concentration. Air temperature positively affected AP concentrations, while air humidity negatively affected AP concentrations. Overall, the shape and intensity of the seasonal AP pattern in this region appears to be driven by long-term phenological dynamics.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2021.1880629","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41566344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-03-04DOI: 10.1080/00173134.2020.1776765
Renhua Zheng, Shun De Su, Hui Xiao, L. Fang, H. Tian
Abstract Calcium dynamics in the developing pollen of Chinese fir (Cunninghamia lanceolata) were investigated using an antimonate calcium precipitation method. After microspores were released from the tetrad, abundant calcium precipitates formed on the surface of microspores. A characteristic event during microspore development is the formation of a large vacuole which displaces the nucleus to the periphery and produces polarity, which initiates male gametophyte development. During the formation of the large vacuole, calcium precipitates moved into the large vacuole via mitochondria, suggesting that calcium abundance is related to vacuole biogenesis and formation. After microspore division, the large vacuole reorganised and calcium became concentrated in smaller vacuoles. The pollen wall of Chinese fir consists mostly of the intine, composed of polysaccharose, and the surface of the pollen grains is covered with a thin indefinite structure, the exine, which is composed of sporopollenin. The function of calcium during pollen development and the characteristics of the pollen wall of Chinese fir are discussed.
{"title":"Calcium dynamic in the developing microsporangiums of Chinese fir (Cunninghamia lanceolata)","authors":"Renhua Zheng, Shun De Su, Hui Xiao, L. Fang, H. Tian","doi":"10.1080/00173134.2020.1776765","DOIUrl":"https://doi.org/10.1080/00173134.2020.1776765","url":null,"abstract":"Abstract Calcium dynamics in the developing pollen of Chinese fir (Cunninghamia lanceolata) were investigated using an antimonate calcium precipitation method. After microspores were released from the tetrad, abundant calcium precipitates formed on the surface of microspores. A characteristic event during microspore development is the formation of a large vacuole which displaces the nucleus to the periphery and produces polarity, which initiates male gametophyte development. During the formation of the large vacuole, calcium precipitates moved into the large vacuole via mitochondria, suggesting that calcium abundance is related to vacuole biogenesis and formation. After microspore division, the large vacuole reorganised and calcium became concentrated in smaller vacuoles. The pollen wall of Chinese fir consists mostly of the intine, composed of polysaccharose, and the surface of the pollen grains is covered with a thin indefinite structure, the exine, which is composed of sporopollenin. The function of calcium during pollen development and the characteristics of the pollen wall of Chinese fir are discussed.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1776765","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42406077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-22DOI: 10.1080/00173134.2020.1836022
M. Filipova-Marinova, D. Pavlov, K. Slavova, K. Chterev
The abyssal plain is the earliest formed morphological element of the Black Sea depression. The core studied is an uninterrupted sequence of Late Pleistocene and Holocene deep-water sediments. The modern western Black Sea coastal forest vegetation is various: temperate deciduous oak species such as Quercus cerris L. and Q. frainetto Ten. are dominant elements in lowland broadleaf deciduous forests; Fraxinus oxycarpa Willd., Ulmus minor Mill., and Alnus glutinosa (L.) Gaertn. are dominant in riverine flooded (riparian) forests; relic South-Euxinian forests of Fagus orientalis Lipsky, with the undergrowth of Rhododendron ponticum L. are spread in humid ravines of the Strandzha Mountains. More scarce are the steppe and the Mediterranean vegetation. The climate is ContinentalMediterranean. Mean annual precipitation is 480 mm. The mean annual temperature is 12 °C.
深海平原是黑海凹陷最早形成的形态元素。所研究的岩芯是一个不间断的晚更新世和全新世深水沉积物序列。现代黑海西部沿海森林植被多种多样：温带落叶橡树，如欧洲栎（Quercus cerris L.）和弗雷内托栎（Q.frainetto Ten）。是低地阔叶落叶林中的优势元素；白蜡。，Ulmus minor Mill。，和Alnus glutinosa（L.）Gaertn。在河流泛滥（河岸）的森林中占主导地位；在斯特兰扎山脉潮湿的峡谷中，分布着东方山竹（Fagus orientalis Lipsky）和桥状杜鹃（Rhododendron ponticum L。草原和地中海植被更为稀少。气候为大陆地中海气候。年平均降水量480毫米，年平均气温12°C。
{"title":"53. Deep water zone of the western Black Sea: the last 20 000 years of vegetation history","authors":"M. Filipova-Marinova, D. Pavlov, K. Slavova, K. Chterev","doi":"10.1080/00173134.2020.1836022","DOIUrl":"https://doi.org/10.1080/00173134.2020.1836022","url":null,"abstract":"The abyssal plain is the earliest formed morphological element of the Black Sea depression. The core studied is an uninterrupted sequence of Late Pleistocene and Holocene deep-water sediments. The modern western Black Sea coastal forest vegetation is various: temperate deciduous oak species such as Quercus cerris L. and Q. frainetto Ten. are dominant elements in lowland broadleaf deciduous forests; Fraxinus oxycarpa Willd., Ulmus minor Mill., and Alnus glutinosa (L.) Gaertn. are dominant in riverine flooded (riparian) forests; relic South-Euxinian forests of Fagus orientalis Lipsky, with the undergrowth of Rhododendron ponticum L. are spread in humid ravines of the Strandzha Mountains. More scarce are the steppe and the Mediterranean vegetation. The climate is ContinentalMediterranean. Mean annual precipitation is 480 mm. The mean annual temperature is 12 °C.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1836022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47415766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-08DOI: 10.1080/00173134.2020.1844794
P. Adeonipekun, M. Adebayo, O. Oyebanji
Abstract The gradual disappearance of ferns due to biodiversity loss occasioned by anthropogenic activities and global climate change necessitated the need to document and study palynologically pteridophytes in Lagos State. Their peculiar habitat is fast declining in many urban centres of the world, including Nigeria. Previous studies in Nigeria mainly addressed their distribution, with limited reports on their morphology and systematic significance. Hence, we conducted a field survey and characterised the spore morphology of the encountered ferns in Lagos State, Nigeria, using light microscopy (LM) and scanning electron microscopy (SEM). We recorded nine species belonging to nine genera and five families. The studied species varied in spore size, shape, and ornamentation. Spores’ sizes ranged between 30 μm × 32 μm in Nephrolepis biserrata and 122 μm × 127 μm in Ceratopteris cornuta. Symmetrically, they were bilateral or radial, and ranged in size between very large, large, and medium. Despite marginal differences in polar to equatorial diameter ratios (P/E ratios), the oblate-spheroidal shape class was found to be a synapomorphic character. We observed relationships between the spore shape and the corresponding aperture type. SEM revealed different spore ornamentation types – tuberculate, canaliculate, rugate/rugulate, reticulate, verrucate, tuberculate, and echinate. Our findings propose the potential use of spore P/E ratio and SEM as taxonomic diagnostic tools in Pteridophyte systematics. However, further studies with more representative species are needed to evaluate the factors influencing spore morphology and its taxonomic significance. Overall, this study provides insights into the systematics of ferns in Lagos State and would aid fern identification in palynology and palaeopalynology.
{"title":"Spore characterisation and its taxonomic significance in ferns from Lagos State, Nigeria","authors":"P. Adeonipekun, M. Adebayo, O. Oyebanji","doi":"10.1080/00173134.2020.1844794","DOIUrl":"https://doi.org/10.1080/00173134.2020.1844794","url":null,"abstract":"Abstract The gradual disappearance of ferns due to biodiversity loss occasioned by anthropogenic activities and global climate change necessitated the need to document and study palynologically pteridophytes in Lagos State. Their peculiar habitat is fast declining in many urban centres of the world, including Nigeria. Previous studies in Nigeria mainly addressed their distribution, with limited reports on their morphology and systematic significance. Hence, we conducted a field survey and characterised the spore morphology of the encountered ferns in Lagos State, Nigeria, using light microscopy (LM) and scanning electron microscopy (SEM). We recorded nine species belonging to nine genera and five families. The studied species varied in spore size, shape, and ornamentation. Spores’ sizes ranged between 30 μm × 32 μm in Nephrolepis biserrata and 122 μm × 127 μm in Ceratopteris cornuta. Symmetrically, they were bilateral or radial, and ranged in size between very large, large, and medium. Despite marginal differences in polar to equatorial diameter ratios (P/E ratios), the oblate-spheroidal shape class was found to be a synapomorphic character. We observed relationships between the spore shape and the corresponding aperture type. SEM revealed different spore ornamentation types – tuberculate, canaliculate, rugate/rugulate, reticulate, verrucate, tuberculate, and echinate. Our findings propose the potential use of spore P/E ratio and SEM as taxonomic diagnostic tools in Pteridophyte systematics. However, further studies with more representative species are needed to evaluate the factors influencing spore morphology and its taxonomic significance. Overall, this study provides insights into the systematics of ferns in Lagos State and would aid fern identification in palynology and palaeopalynology.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1844794","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46789857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-21DOI: 10.1080/00173134.2020.1827026
M. Filipova-Marinova, D. Pavlov, K. Slavova
The Black Sea is an intercontinental enclosed-type marine basin. The Black Sea continental slope is characterised by deeply indented relief. The AKAD09-10 core studied consists of continuous deposits and was taken from the interfluvial zone located between submarine valleys. The natural vegetation of the western Black Sea coast is dominated by temperate forest communities of Quercus cerris L. and Q. frainetto Ten., together with Q. polycarpa Schur. and Carpinus betulus L. (Bondev 1991; FilipovaMarinova et al. 2017). Riverine flooded (riparian) forests are mainly composed of Fraxinus oxycarpa Willd., Ulmus minor Mill., Carpinus betulus, Q. pedunculiflora C.-Koch, Alnus glutinosa (L.) Gaerth., and Hedera helix L. Relic South-Euxinian forests of Fagus orientalis Lipsky, with the undergrowth of Rhododendron ponticum L. are spread in humid ravines of the Strandzha Mountains. Steppe vegetation of the Dobrudzha region is dominated by Festuca pseudovina Hack. ex Wiseb., Chrysopogon gryllus (L.) Trin., Botriochloa ischaemum (L.) Keng, and Poa bulbosa L. Elements of the Mediterranean vegetation are Paliurus spina-christi Mill., Carpinus orientalis Mill., Phillyrea latifolia L., and Fraxinus ornus L. The western Black Sea coast is part of the Continental-Mediterranean climatic area and is influenced by the proximity of the sea. Mean annual precipitation in Varna is 480 mm. The mean annual temperature in Varna is 12 °C (Kotsev & Filipova-Marinova 2017).
{"title":"52. Western Black Sea continental slope: continuous Late Pleniglacial to Subatlantic palaeovegetation record","authors":"M. Filipova-Marinova, D. Pavlov, K. Slavova","doi":"10.1080/00173134.2020.1827026","DOIUrl":"https://doi.org/10.1080/00173134.2020.1827026","url":null,"abstract":"The Black Sea is an intercontinental enclosed-type marine basin. The Black Sea continental slope is characterised by deeply indented relief. The AKAD09-10 core studied consists of continuous deposits and was taken from the interfluvial zone located between submarine valleys. The natural vegetation of the western Black Sea coast is dominated by temperate forest communities of Quercus cerris L. and Q. frainetto Ten., together with Q. polycarpa Schur. and Carpinus betulus L. (Bondev 1991; FilipovaMarinova et al. 2017). Riverine flooded (riparian) forests are mainly composed of Fraxinus oxycarpa Willd., Ulmus minor Mill., Carpinus betulus, Q. pedunculiflora C.-Koch, Alnus glutinosa (L.) Gaerth., and Hedera helix L. Relic South-Euxinian forests of Fagus orientalis Lipsky, with the undergrowth of Rhododendron ponticum L. are spread in humid ravines of the Strandzha Mountains. Steppe vegetation of the Dobrudzha region is dominated by Festuca pseudovina Hack. ex Wiseb., Chrysopogon gryllus (L.) Trin., Botriochloa ischaemum (L.) Keng, and Poa bulbosa L. Elements of the Mediterranean vegetation are Paliurus spina-christi Mill., Carpinus orientalis Mill., Phillyrea latifolia L., and Fraxinus ornus L. The western Black Sea coast is part of the Continental-Mediterranean climatic area and is influenced by the proximity of the sea. Mean annual precipitation in Varna is 480 mm. The mean annual temperature in Varna is 12 °C (Kotsev & Filipova-Marinova 2017).","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1827026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47835863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-14DOI: 10.1080/00173134.2020.1822440
J. Revelles, M. Ghilardi
The study site, l’etang de Piantarella, is located in Bonifacio, on the southern coast of Corsica (France). Three cores were extracted: Piantarella 1 (630 cm, WGS84: 41° 22ʹ 29.34″ N, 9° 13ʹ 12.62″...
{"title":"50. Piantarella (south Corsica, France)","authors":"J. Revelles, M. Ghilardi","doi":"10.1080/00173134.2020.1822440","DOIUrl":"https://doi.org/10.1080/00173134.2020.1822440","url":null,"abstract":"The study site, l’etang de Piantarella, is located in Bonifacio, on the southern coast of Corsica (France). Three cores were extracted: Piantarella 1 (630 cm, WGS84: 41° 22ʹ 29.34″ N, 9° 13ʹ 12.62″...","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1822440","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44838417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-12DOI: 10.1080/00173134.2020.1827025
J. R. Hernández
Abstract The palaeobotanical name Clavatricolpites Hoeken-Klink., representing a Late Cretaceous magnoliopsid pollen genus, is a later homonym. It is preoccupied by the Tricolpate pollen genus name Clavatricolpites R. L. Pierce and is replaced by Nigericolpites nom. nov.
{"title":"Nigericolpites: a replacement name for the illegitimate Maastrichtian magnoliopsid pollen genus Clavatricolpites Hoeken-Klink. (Angiospermae: Magnoliopsida)","authors":"J. R. Hernández","doi":"10.1080/00173134.2020.1827025","DOIUrl":"https://doi.org/10.1080/00173134.2020.1827025","url":null,"abstract":"Abstract The palaeobotanical name Clavatricolpites Hoeken-Klink., representing a Late Cretaceous magnoliopsid pollen genus, is a later homonym. It is preoccupied by the Tricolpate pollen genus name Clavatricolpites R. L. Pierce and is replaced by Nigericolpites nom. nov.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1827025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44397646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-12DOI: 10.1080/00173134.2020.1825793
F. G. Vossler
Abstract Pollen and honey resources composing the diet of Tetragonisca angustula fiebrigi Schwarz were assessed using pollen analysis of wild colonies sampled in two kinds of native dry forests of the Chaco region. Different measurements: direct pollen count, relative volume, diversity and evenness indices, value of importance of species (SI), and index of relative importance (IRI) were compared. The IRI identified the most important pollen resources as Prosopis (IRI = 1619), Schinopsis type (IRI = 1578), Trithrinax schizophylla (IRI = 972) and Capparicordis/Sarcotoxicum (IRI = 587), and according to SI the honey resources were Schinopsis type (SI = 117.41), Maytenus type (SI = 101.89), Prosopis (SI = 86.47) and Ziziphus mistol (SI = 50.93). The absolute pollen analysis of honey revealed that all samples were rich in pollen grains. Floral resources were most homogeneously foraged during spring and summer when a high number of flowerings were available and the highest temperatures were recorded. These optimal conditions for bee foraging activity also allowed for the highest diversity indices in these seasons. However, heterogeneous foraging and low diversity were detected during winter and autumn. Most pollen and honey resources belonged to generalised small flowers of diverse plant lineages. The IRI was more comprehensive to identify the most important pollen resources than the commonly used direct pollen count, as it also includes relative volume and frequency of occurrence, and SI was the most thorough for studying the honey resources. This study provides helpful information for sustainable meliponiculture and forest conservation.
{"title":"Assessment of pollen and honey diet of Tetragonisca angustula fiebrigi Schwarz in the Chaco dry forest by using pollen analysis","authors":"F. G. Vossler","doi":"10.1080/00173134.2020.1825793","DOIUrl":"https://doi.org/10.1080/00173134.2020.1825793","url":null,"abstract":"Abstract Pollen and honey resources composing the diet of Tetragonisca angustula fiebrigi Schwarz were assessed using pollen analysis of wild colonies sampled in two kinds of native dry forests of the Chaco region. Different measurements: direct pollen count, relative volume, diversity and evenness indices, value of importance of species (SI), and index of relative importance (IRI) were compared. The IRI identified the most important pollen resources as Prosopis (IRI = 1619), Schinopsis type (IRI = 1578), Trithrinax schizophylla (IRI = 972) and Capparicordis/Sarcotoxicum (IRI = 587), and according to SI the honey resources were Schinopsis type (SI = 117.41), Maytenus type (SI = 101.89), Prosopis (SI = 86.47) and Ziziphus mistol (SI = 50.93). The absolute pollen analysis of honey revealed that all samples were rich in pollen grains. Floral resources were most homogeneously foraged during spring and summer when a high number of flowerings were available and the highest temperatures were recorded. These optimal conditions for bee foraging activity also allowed for the highest diversity indices in these seasons. However, heterogeneous foraging and low diversity were detected during winter and autumn. Most pollen and honey resources belonged to generalised small flowers of diverse plant lineages. The IRI was more comprehensive to identify the most important pollen resources than the commonly used direct pollen count, as it also includes relative volume and frequency of occurrence, and SI was the most thorough for studying the honey resources. This study provides helpful information for sustainable meliponiculture and forest conservation.","PeriodicalId":50414,"journal":{"name":"Grana","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00173134.2020.1825793","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47052249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/00173134.2020.1737729
A. Coutinho, P. Silveira, C. Pita, M. Santos, Catarina Saraiva, Natacha Catarina Perpétuo
Abstract The pollen morphology of the Iberian taxa of the genus Xanthium s.l. and of the non-Iberian species X. ambrosioides was studied to help to identify these poisonous, allergenic and invasive taxa and clarify their taxonomic relationships. In addition, the question of the existence and structure of a mesoaperture in the apertural system of Xanthium was also considered. The pollen grains of sections Acanthoxanthium and Xanthium clearly differ by their characters, which supports the separation of both taxa and allows for their distinction based on pollen morphology. It is suggested that the morphological and palynological differences between Xanthium and Acanthoxanthium, together with the lack of hybridisation between the two sections and the monophyly of Acanthoxanthium, could lead to the elevation of the latter to the generic status. The two species of section Xanthium present in the Iberian Peninsula (X. orientale and X. strumarium) and of section Acanthoxanthium are well separated by their palynological features. Likewise, the Iberian subspecies of Xanthium, X. orientale subsp. orientale and X. orientale subsp. italicum are palynologically distinguishable. However, no significant difference could be found between the pollen of X. strumarium subsp. strumarium and of X. strumarium subsp. brasilicum. The pollen data do not support the hypotheses of a hybrid origin for X. strumarium subsp. brasilicum. A mesoaperture intersecting the foot layer and the upper part of the endexine is present in both sections, which is congruent with the results already found for other Asteroideae.
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