Academic literature on the topic 'Arboreal pollen'
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Journal articles on the topic "Arboreal pollen"
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Bera, S. K., and H. P. Gupta. "Correlation between pollen spectra and vegetation of Chhota Shigri Glacier in Himachal Pradesh, India." Journal of Palaeosciences 38 (December 31, 1989): 404–10. http://dx.doi.org/10.54991/jop.1989.1675.
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Pollen analysis of modern surface samples and glacial deposits, collected from Chhota Shigri Glacier at different altitudes ranging between 3.750 to 5.010 m, has been carried out to understand the pollen/vegetation relationship. The study reflects the predominance of extra-regional arboreals over local non-arboreal taxa.
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Chauhan, M. S., and M. F. Quamar. "Pollen rain deposition pattern in tropical deciduous Sal (Shorea robusta Gaertn.) forest in Shahdol District, Madhya Pradesh, India." Journal of Palaeosciences 62, no. (1-2) (December 31, 2013): 47–53. http://dx.doi.org/10.54991/jop.2013.334.
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The pollen rain–vegetation relationship study, based on pollen analysis of 6 surface samples from tropical deciduous Sal (Shorea robusta Gaertn.) forest at Khanaudi, Shahdol District reveals the relatively lower frequencies of arboreal taxa in contrast to non–arboreal taxa. Among the arboreals, Shorea robusta, a dominant forest constituent, is not represented appropriately in the pollen–rain and encountered with av. 2% pollen only in the sediments. The under–representation of Shorea robusta pollen, despite being high pollen producer, could be attributed to its poor preservation in the sediments as well as low dispersal efficiency. On the other hand, the consistent presence of Madhuca indica, a common associate of Sal, and Sapotaceae with high frequencies of average 19% and 6%, respectively corresponds more or less with their frequent presence in the forest coupled with good preservation of their pollen in the sediments. However, a large number of other associates of Sal, viz. Terminalia, Lagerstroemia, Emblica officinalis, Syzygium, Holoptelea, Sterculia, etc. occurring appreciably in the forest, denote sporadic presence with av. 10% pollen only owing to their low pollen productivity, since they are entomogamous. Thus, av. 39% arboreal pollen including av. 37% trees and av. 2% shrubs, though scanty, represent the modern Sal forest in the region. The abundance of pollen of grasses, sedges, Tubuliflorae, etc. corresponds with their composition in the ground flora. The consistently moderate frequencies of Cerealia and Cheno/Am coupled with sporadic pollen of Artemisia, Cannabis sativa and Caryophyllaceae indicate the proximity of cultivated land.
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Verma, Divya. "PREVALENCE OF AIRBORNE POLLEN GRAINS AND FUNGAL SPORES IN A CITY OF THAR DESERT, INDIA." Journal of Advanced Scientific Research 13, no. 08 (September 30, 2022): 45–53. http://dx.doi.org/10.55218/jasr.202213808.
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Monitoring of bioaerosols i.e., pollen grains and fungal spores, was undertaken for two consecutive years in a city of Thar Desert- Bikaner, using Gravity Slide Method. A total of 32 different pollen taxa were identified with Annual Pollen Integral (API) of 890 pollen grains per sq. cm in the first year and 906 pollen grains per sq. cm in the second year. The pollen count of non-arboreal plants was much more than that of the arboreal plants. The most prominent annual average pollen percentage was credited to Poaceae (25.91%), followed by Chenopodiaceae/Amaranthaceae (17.57%), Papilionaceae (7.86%) and Cyperaceae (5.95%) among non-arboreal plants: and to Prosopis juliflora (14.84%) amongst arboreal taxa. Two peak seasons were observed in both the years i.e., February to April and August to October for both pollen grains as well as fungal spores. 32 types of airborne fungal spores were reported from the atmosphere of Bikaner during the study. A total number of 6717 fungal spores per sq. cm were counted in the first year and 7117 spores per sq. cm in the second year. The commonest fungal spores encountered were of the species of Cladosporium, followed by Alternaria and Curvularia with annual mean percentage of 24.95%, 23.02% and 11.53 respectively.
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Verma, Poonam, and M. R. Rao. "Modern pollen and vegetation relationship in the teak deciduous forest in Sehore District, Madhya Pradesh." Journal of Palaeosciences 62, no. (1-2) (December 31, 2013): 55–63. http://dx.doi.org/10.54991/jop.2013.336.
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Pollen analyses of 19 surface soil and mud samples in and around Kusumelli Swamp near Shahganj, Sehore District of Madhya Pradesh were carried out to understand modern pollen and vegetation relationship in the dry deciduous teak dominated forest region. The palynological assemblage demonstrates pervasiveness of non–arboreal (herbs) forms in comparison to arboreal (trees and shrubs) taxa. Maximum arboreal pollen are recorded in forest floor (average 37%) in comparison to lake floor sediments (average 33%) followed by forest vicinity mud (average 29%) and forest edge open area (average 24%). The most common constituent of modern forest floristic, i.e. teak (80–90%) is recorded by average of 1% in lake, forest and adjoining floor sediments. The other members such as Madhuca indica (average 2.1%), Syzygium sp. (average 1.6%), Terminalia sp. (average 1.4%), Butea monosperma (average 1%), Embilica officinalis (average 0.7%), Diospyros sp. and Lannea grandis (average 0.6%) are also recorded in low frequencies. This discrepancy in the pollen deposition pattern is possibly due to their low pollen production and partial preservation in sediments. Stumpy pollen frequency of Sal (average 0.4%) recovered in open area and lake floor sediments could be ascribed to its anemophilous mode of pollination and transportation through low turbulent winds and water from nearby area. However, better representation of Holoptelea (average 4.4%) and Buchanania lanza (average 3.8%) in all sediment samples can be substantiated through their huge pollen production and higher dispersal efficiency. In addition, non–arboreal representatives such as Asteraceae (Tubuliflorae and Liguliflorae), Caryophyllaceae, Malvaceae, Brassicaceae, Chenopodiaceae/Amaranthaceae and Cannabinaceae, etc. more or less reflect actual composition of the ground flora. The comparative database generated on pollen–vegetation spectra will serve a modern pollen analogue for factual appraisal of fossil pollen successions deposited during Quaternary Period in the region.
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Piotrowska-Weryszko, Krystyna, and Elżbieta Weryszko-Chmielewska. "Spatial differentiation of airborne arboreal pollen in Lublin (Poland)." Acta Agrobotanica 68, no. 4 (2015): 333–41. http://dx.doi.org/10.5586/aa.2015.035.
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The study compared the occurrence of airborne pollen of 7 arboreal taxa (<em>Corylus</em>, <em>Alnus</em>, Cupressaceae/Taxaceae, <em>Populus</em>, <em>Fraxinus</em>, <em>Betula</em> and <em>Carpinus</em>) during the period 2007–2009 from two sites in Lublin city, SE Poland. The sites differed in the character of building development and surrounding vegetation. Pollen monitoring was conducted by the volumetric method using two Hirst-type samplers. Daily and intradiurnal pollen counts were determined. For all the taxa, Spearman’s test revealed statistically significant positive correlations between daily pollen fluctuations at two sites. Nevertheless, the Mann–Whitney <em>U</em>-test showed differences for Cupressaceae/Taxaceae, <em>Fraxinus</em>, <em>Populus</em> and <em>Corylus</em> between sites. The intradiurnal pattern of pollen concentration was characterized by high variation. Cupressaceae/Taxaceae and <em>Populus</em>, clearly differed in hourly pollen concentrations at both sites. Moreover, in the case of <em>Betula</em> and <em>Alnus</em> it was shown that a part of pollen recorded in Lublin can originate from long-distance transport. High pollen concentrations can be expected at different hours of the day. The lowest average pollen concentrations at both sites were found during morning hours at 5 and 6 a.m. Based on the obtained results, it can be concluded that data from a single pollen-sampling device are not representative of some taxa in the particular districts of the city. Average data obtained from at least two pollen samplers could provide optimum results.
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Kutluk, Hatice, and Burhan Aytug. "Airborne pollen flora of a deciduous mesic forest in Turkey." Bangladesh Journal of Plant Taxonomy 17, no. 1 (June 29, 2010): 23–31. http://dx.doi.org/10.3329/bjpt.v17i1.5388.
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Airborne pollen composition of a deciduous mesic forest in northwestern Turkey is compared with the flora of the forest and a wider area. The airborne assemblage is constituted by 641.553 pollen belonging to 32 orders, 54 families and 96 genera. Of these, 380.000 (59.2%) belong to native and 257.180 (40.1%) to non-native plants. Among the native taxa arboreal pollen (AP) is represented by 55.7% and non-arboreal (NAP) by 44.3%. All of the arboreal elements of the forest are Quercus, Castanea, Carpinus, Ulmus, Alnus, Populus, Salix, Fagus, Tilia, Acer, Corylus, Prunus, Rubus, Ligustrum, Phillyrea which represented in the airborne assemblage. Incorporation of NAP to airborne composition is less than AP and they more likely provide an indication of the composition of local plant communities and hence represent vegetation of immediate vicinity. The most common NAP taxa are Poaceae, Plantaginaceae, Asteraceae, Urticaceae, Apiaceae, Cannabaceae, Polygonaceae and Cyperaceae. Pollen of climbers are less represented than AP but more than NAP taxa. Platanus orientalis (30.7%) and Pinus and Cupressus (20.2%) constitute half of the non-native flora; the rest is the pollen of exotic, alien and horticultural taxa from numerous parks and gardens in İstanbul.
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Pisaric, Michael FJ, Julian M. Szeicz, Tammy Karst, and John P. Smol. "Comparison of pollen and conifer stomates as indicators of alpine treeline in northwestern Canadian lake sediments." Canadian Journal of Botany 78, no. 9 (September 1, 2000): 1180–86. http://dx.doi.org/10.1139/b00-092.
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We compare fossil pollen and stomate assemblages in 29 lake sediment surface samples from mountainous regions in northwestern Canada to characterize the relationship between modern vegetation, and pollen and stomate deposition. Modern pollen spectra were dominated by arboreal taxa originating from lower elevation sites. Pinus pollen frequently reached 30% of the pollen sum, regardless of elevation. Alpine-tundra vegetation has lower pollen abundance, even in the alpine-tundra zone, where it dominates the sparse vegetation cover. Fossil stomates were observed in all but one site where trees currently exist in the vicinity of the lake, while no stomates were found in the sediments from alpine-tundra sites. The highest concentration of stomates occurred in lake sediments from closed-canopy forested areas. Our data suggest that different boreal forest types may be differentiated based on pollen assemblages and that the presence of stomates clearly distinguishes vegetation zones dominated by arboreal vegetation from alpine-tundra zones where trees are not present.Key words: pollen, conifer stomates, treeline, Pacific Northwest.
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Gajewski, K., A. M. Swain, and G. M. Peterson. "Late Holocene Pollen Stratigraphy in Four Northeastern United States Lakes." Géographie physique et Quaternaire 41, no. 3 (December 18, 2007): 377–86. http://dx.doi.org/10.7202/032693ar.
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ABSTRACT Four pollen diagrams from Maine, New York, and Pennsylvania provide fine resolution (40 or 80 years) records of vegetation change in northeastern United States during the past 2000 years. A long term increase in pollen accumulation rates (PAR) of Picea occurred at the three sites in Maine and New York. Around 1100 years ago, Tsuga and Fagus decreased and Quercus and Castanea increased at Ely Lake in northeastern Pennsylvania. Around 500 years ago, Tsuga and Fagus greatly decreased in Maine and northern New York, while in northeastern Pennsylvania there was an increase in Tsuga and Fagus and a decrease in Quercus and Castanea pollen. Non-arboreal PAR were negligible prior to the European settlement of the area, after which there was an abrupt increase in non-arboreal pollen types.
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Trivedi, Anjali, Anju Saxena, and Mohan Singh Chauhan. "Study on modern vegetation distribution in Sevan Tal area, Raebareli District, Uttar Pradesh." Journal of Palaeosciences 68, no. (1-2) (December 31, 2019): 139–46. http://dx.doi.org/10.54991/jop.2019.40.
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Pollen analysis of ten surface sediment samples from Sevan Tal, Raebareli District (U.P.) reveals a good assemblage of arboreals (trees & shrubs) comprising Holoptelea integrifolia, Acacia nilotica, Syzygium cumini, Madhuca indica and Shorea robusta, etc. However, plant diversity in forest groves has been observed in eastern and southern fringes but are less diversified in northern and western flanks due to arable and heathland, respectively in the area. Together with av. 4% shrubs, the trees constitute av. 23.3% arboreal pollen. Even then, in general, the reduced frequencies of the trees could be ascribed to their low pollen productivity since they portray a strong tendency of entomophily. Among the non–arboreals, Poaceae with av. 35% pollen subdues the other herbaceous elements. The substantially increased frequencies of cultural taxa, viz. Cerealia, Chenopodiaceae/ Amaranthaceae (Cheno/Am), Artemisia, Cannabis sativa and Brassicaceae, more particularly on the northern and western flanks, truly reflect the intensive agriculture practice in the region. The consistent presence of marshy taxa such as Cyperaceae coupled with Polygonum plebeium, P. serrulatum and Liliaceae suggests the intermittent wetlands in the proximity of the lake. In all, the representation of the non–arboreals corresponds closely with their factual occurrence in the ground flora, constituting the largest chunk of av. 75% pollen. The frequent record of Potamogeton together with Lemna, Typha, etc. denotes the existence of the lakes around the sampling provenance. This comparative database on pollen vis–à–vis vegetation relationship serves as modern analogue for the appropriate assessment of the pollen sequence from the sediment deposit in terms of past vegetation and climate change in the Central Ganga Plain. Moreover, the representation of the arboreals, particularly trees, in the spectra symbolizes the prevailing climatic condition in the study area.
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González-Fernández, Estefanía, Sabela Álvarez-López, Alba Piña-Rey, María Fernández-González, and Francisco Javier Rodríguez-Rajo. "Data Mining Methods to Detect Airborne Pollen of Spring Flowering Arboreal Taxa." Forests 12, no. 12 (December 18, 2021): 1801. http://dx.doi.org/10.3390/f12121801.
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Variations in the airborne pollen load are among the current and expected impacts on plant pollination driven by climate change. Due to the potential risk for pollen-allergy sufferers, this study aimed to analyze the trends of the three most abundant spring-tree pollen types, Pinus, Platanus and Quercus, and to evaluate the possible influence of meteorological conditions. An aerobiological study was performed during the 1993–2020 period in the Ourense city (NW Spain) by means of a Hirst-type volumetric sampler. Meteorological data were obtained from the ‘Ourense’ meteorological station of METEOGALICIA. We found statistically significant trends for the Total Pollen in all cases. The positive slope values indicated an increase in pollen grains over the pollen season along the studied years, ranging from an increase of 107 to 442 pollen grains. The resulting C5.0 Decision Trees and Rule-Based Models coincided with the Spearman’s correlations since both statistical analyses showed a strong and positive influence of temperature and sunlight on pollen release and dispersal, as well as a negative influence of rainfall due to washout processes. Specifically, we found that slight rainfall and moderate temperatures promote the presence of Pinus pollen in the atmosphere and a marked effect of the daily thermal amplitude on the presence of high Platanus pollen levels. The percentage of successful predictions of the C5.0 models ranged between 62.23–74.28%. The analysis of long-term datasets of pollen and meteorological information provides valuable models that can be used as an indicator of potential allergy risk in the short term by feeding the obtained models with weather prognostics.
Book chapters on the topic "Arboreal pollen"
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Nepi, M., and E. Pacini. "What may be the significance of polysiphony in Lavatera arborea ?" In Anther and Pollen, 13–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-59985-9_2.
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"Arboreal Pollen." In Encyclopedic Dictionary of Archaeology, 75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58292-0_10713.
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