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Academic literature on the topic 'Cryptogams'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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Journal articles on the topic "Cryptogams"

1

Qu, Meixue, Wenbiao Duan, and Lixin Chen. "The Role of Cryptogams in Soil Property Regulation and Vascular Plant Regeneration: A Review." Applied Sciences 14, no. 1 (December 19, 2023): 2. http://dx.doi.org/10.3390/app14010002.

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Despite their small size, cryptogams (lichen, liverwort, and moss) are important for ecosystem stability. Due to their strong stress resistance, cryptogams often cover extreme environments uninhabitable for vascular plants, which has an important impact on the material cycle and energy flow of various terrestrial ecosystems. In this article, we review and discuss the effects of cryptogams on soil properties (moisture and fertility) and vascular plant regeneration over the past two decades. Cryptogams strongly affect soil water content by influencing precipitation infiltration, non-rainfall water input, soil evaporation, soil water holding capacity, and soil permeability, ultimately helping to reduce soil water content in areas with low annual precipitation (<500 mm). However, in areas with high annual precipitation (>600 mm) or where the soil has other water sources, the presence of cryptograms is conducive to soil water accumulation. Cryptogam plants can increase soil fertility and the availability of soil nutrients (TOC, TN, TP, TK, and micronutrients) in harsh environments, but their effects in mild environments have not been sufficiently investigated. Cryptogam plants exert complex effects on vascular plant regeneration in different environments. The primary influence pathways include the physical barrier of seed distribution, shading, allelopathy, competition, influences on ectomycorrhizal development and individual reproduction, and the regulation of soil water content, temperature, and nutrients.

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2

Aszalósné Balogh, Rebeka, Edit Farkas, Júlia Tüdősné Budai, László Lőkös, and Gábor Matus. "Cryptogamic Biomass in Pannonic Acidic Sand Steppes Subject to Changing Land-Use." Plants 12, no. 16 (August 17, 2023): 2972. http://dx.doi.org/10.3390/plants12162972.

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Cryptogams, often neglected in vegetation dynamics studies, compose a large part of biomass and contribute to the biodiversity of sandy grasslands. Since the work of Verseghy (1970s), their productivity has not been analyzed in Hungary. We studied the lichen and bryophyte dynamics (hereinafter called cryptogams) at two Eastern Hungarian dry sandy grassland sites. The sites of Corynephorus canescens and of Festuca vaginata dominance, respectively, belonging to the community Festuco vaginatae–Corynephoretum have been monitored. We aimed at (1) quantifying the diversity and biomass of the cryptogamic communities; (2) exploring the cryptogamic response to management changes; and (3) studying the effect of experimental management (fencing) on the cryptogamic assemblages. The sites have been compared in 2013 and 2018, respectively. Forty microplots per site per management have been analyzed in both years. Samples of lichens and bryophytes were hand-sorted, dried and then measured. Fencing has led to increased biomass of cryptogams within a few years. Lichens in general benefited comparatively more from exclosure than bryophytes. The increase in lichen biomass (especially that of Cladonia rangiformis) is clearly due to the over 10-year absence of grazing. The only lichen favored by moderate grazing is the legally protected C. magyarica. Short spells of low-intensity grazing can promote the species richness of cryptogams in the community.

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Kinnell, PIA, CJ Chartres, and CL Watson. "The effects of fire on the soil in a degraded semiarid woodland .II. Susceptibility of the soil to erosion by shallow rain impacted flow." Soil Research 28, no. 5 (1990): 779. http://dx.doi.org/10.1071/sr9900779.

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Small (500 by 250 by 100 mm) soil monoliths collected from experimental plots subjected to various fire frequencies in a semi-arid woodland near Coolabah, N.S.W., were tested for their susceptibility to erosion by rain-impacted flows under laboratory conditions. In the tests, the erosive stress applied to the soil surfaces was controlled by using drops of uniform size (2.7 mm) falling 11.2 m onto flows whose depths were controlled between 1 and 2.7 drop diameters. Experimental data and thin-section observations showed that cryptogams provide a high degree of protection against erosion. Sediment concentration (measured in g L-1) from cryptogam-covered plots was considerably less than that from both bare-crusted surfaces and surfaces dominated by depositional material. Surfaces with cryptogamic crusts were generally free of debris, but showed only minor signs of erosion, whereas bare-crusted and depositionary surfaces suffered pronounced lowering and tended to disintegrate. Because increasing fire frequency reduces the spatial distribution of the cryptogamic cover on the soil surface in the semi-arid woodlands, increasing fire frequency must increase the erosion hazard.

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Bokhorst, Stef, and Peter Convey. "Impact of marine vertebrates on Antarctic terrestrial micro-arthropods." Antarctic Science 28, no. 3 (February 3, 2016): 175–86. http://dx.doi.org/10.1017/s0954102015000607.

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AbstractTraits of primary producers associated with tissue quality are commonly assumed to have strong control over higher trophic levels. However, this view is largely based on studies of vascular plants, and cryptogamic vegetation has received far less attention. In this study natural gradients in nutrient concentrations in cryptogams associated with the proximity of penguin colonies on a Maritime Antarctic island were utilized to quantify the impact of nitrogen content on micro-arthropod communities. Proximity to penguin colonies increased the nitrogen concentration of cryptogams, and the penguin source was confirmed by decreasing δ15N values at greater distances from colonies. Micro-arthropod abundance, diversity (H’) and richness declined with distance from the penguin colonies, and was positively correlated with the nitrogen concentrations of cryptogams. Δ15N of micro-arthropods was positively correlated (r2=0.865, P<0.01) with δ15N of the moss Andreaea depressinervis indicating that penguin-derived nitrogen moves through Antarctic food webs across multiple trophic levels. Nitrogen content of cryptogams was correlated with associated micro-arthropods indicating that biotic interactions affect community development in Antarctic terrestrial ecosystems. The spatial patterns of Antarctic biodiversity can therefore be affected by local factors, such as marine vertebrates, beyond existing latitudinal patterns of temperature and water availability.

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5

Newmaster, Steven G., and F. Wayne Bell. "The effects of silvicultural disturbances on cryptogam diversity in the boreal-mixedwood forest." Canadian Journal of Forest Research 32, no. 1 (January 1, 2002): 38–51. http://dx.doi.org/10.1139/x01-163.

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In northern forests, cryptogams (spore producing plants) occupy a key position in forest ecosystem diversity and function. Forest harvesting and silvicultural practices have the potential to reduce cryptogam diversity. This project uses four blocks that were mechanically site prepared, planted with a single conifer species, and subsequently subjected to five conifer release treatments: (1) motor-manual cleaning, (2) mechanical brush cutting, (3) aerial application of triclopyr, (4) aerial application of glyphosate, and (5) control (untreated clearcut). Five 10 × 10 m subplots were installed in each of the five treatment plots and the uncut forest on the four blocks. Botanical surveys were conducted before and 15 years after treatments. Species richness and abundance, Shannon's and Heip's indices, and rank abundance diagrams clearly show that richness and abundance were affected by silvicultural treatments. Vegetation management treatments resulted in significant reductions in cryptogam diversity, to the point that only a few colonists and drought-tolerant species remained. Cryptogam diversity was ranked in the following order: forest > clearcut > mechanical clearing > herbicide treatment. Herbicide treatments had the greatest initial effect on species richness, species abundance, and diversity indices. Cryptogam diversity showed signs of recovery 5 years after treatments. Missed strips (untreated areas) within a clearcut provided a refuge for remnant communities of forest cryptogams that could play a key role in the rehabilitation forest diversity.

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Greene, RSB, CJ Chartres, and KC Hodgkinson. "The effects of fire on the soil in a degraded semiarid woodland .I. Cryptogam cover and physical and micromorphological properties." Soil Research 28, no. 5 (1990): 755. http://dx.doi.org/10.1071/sr9900755.

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The effects of fire on the cryptogam cover and physical and micromorphological properties of a massive red earth soil were studied in a semi-arid eucalypt woodland, heavily invaded by shrubs, near Coolabah, N.S.W. Fire reduced the cryptogam cover and concomitantly increased the depositional material produced by erosion and the area of bare surface. Annual fires for 7 years completely destroyed the cryptogamic crusts, but they recovered slowly in the absence of fire to reach the same cover as unburnt areas after about 4 years. A single fire also caused a major decline in aggregate stability of the 0-1 cm horizon, possibly because of alteration of organic cementing materials which consist of gels secreted by algae. Micromorphological observations of surface crusts showed that, as the frequency of fire increased, there was more depositional material produced by erosion coupled with the presence of thin laminated deposits. There was also less surface irregularity, fewer algal gels and less evidence of soil mixing by soil fauna. There was a significant negative relationship between the saturated infiltration rate and the number of fires (r2 = 0.63, P = 0.05). However, there was no effect of fire treatment on the unsaturated infiltration rate measured at a supply pressure of -40 mm, at which pores >0.75 mm diameter are excluded from water flow. In our burned plots, the rate of recolonization by cryptogams was relatively fast and, with approximately 4 years recovery, cryptogam cover reached the level of unburned controls. This cryptogam cover is critical in maintaining the physical properties of the soil. It is concluded, therefore, that irregular fires in this land system will not result in a permanent decline in the physical properties of the soil.

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Bassey, M. E., E. D. Anwana, E. O. Mbong, and O. T. Umoh. "Diversity and distribution of vascular cryptogams in relation to elevation gradient in Osomba range of the Cross River National Park, Cross River State, Nigeria." World Journal of Applied Science & Technology 15, no. 1 (November 28, 2023): 26–32. http://dx.doi.org/10.4314/wojast.v15i1.26.

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Vascular cryptogams also known as Pteridophytes have been found to colonize the lower altitudes of world’s tropical forest regions. Hence, a study to establish the relationship existing between elevation gradient and Pteridophytes heterogeneity and distribution within Osomba Range, Cross River State, Nigeria was carried out. In this study, we delineated four elevation classes and enumerated the vascular cryptogam communities found at each level within the range using standard scientific protocol. Shannon-Wiener's (3.434 and 2.833) and Simpson’s indices of diversity (0.968 and 0.941) as well as Taxa (31 and 17) assumed a dump bell pattern with peak values associated with the mid-elevation classes (178 -205m and 232 – 240m) respectively. On the contrary, dominance followed an inverted dump bell distribution with its optimum (0.1667 and 0.2500) skewed towards the extreme elevation classes (297 – 295 m and 347- 405 m). Correlation analysis imprinted a significant (P<0.05) positive relationship between altitude and dominance (0.867*) but an inverse relationship between elevation and Simpson diversity (-0.867*). 178- 205 m and 232-240 m elevation classes were more comparable with lesser species heterogeneity judging from Bray and Curtis (0.458), Simpson (0.647) and Jaccard (0.297) similarity indices respectively. Conclusively, forty-nine (49) species of vascular cryptogams were identified and their occurrence seemed patchy in distribution along the gradient. This is an indication that elevation is an important factor amongst the suite of ecological drivers which determine the diversity of this critical group of plants. Further investigation on individual species response to ecological gradient is recommended as this will enhance the conservation of these vascular cryptogams within and outside the study area.

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Bell, Peter R. "The life cycles of cryptogams." Acta Botanica Malacitana 16 (December 1, 1991): 5–16. http://dx.doi.org/10.24310/abm.v16i.9126.

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Meiosis and karyogamy are recognized as control points in the life cycle of cryptogams. The control of meiosis is evidently complex and in yeast, and by analogy in all cryptogams, involves progressive gene activation. The causes of the delay in meiosis in diplohaplontic and diplontic organisms, and the manner in which the block is removed remain to be discovered. There is accumulating evidence that cytoplasmic RNA plays an important role in meiotic division. Many features of gametogenesis are still obscure. The tendency to oogamy has provided the opportunity for the laying down of long-lived messenger RNA in the abundant cytoplasm of the female gamete. The sporophytic nature of the developing zygote can in this way be partially pre-determined. There is evidence that this is the situation in the ferns. Specific molecules (probably arabino-galacto-proteins) on the surface of the plasma membrane are likely to account both for gametic selection, and the readiness with which appropriate gametes fuse. The dikaryotic condition indicates that nuclear fusion is not inevitable following plasmogamy. The ultimate fusion of the nuclei may result from quite simple changes in the nuclear surface. Exposure of lipid, for example, would lead to fusion as a result of hydrophobic forces. Aberrations of cryptogamic life cycles are numerous. The nuclear relationships of many aberrant cycles are unknown. In general it appears that the maintenance of sporophytic growth depends upon the presence of at least two sets of chromosomes. Conversely the maintenance of gametophytic growth in cultures obtained aposporously appears to be impossible in the presence of four sets of chromosomes, or more. These results raise important problems of the effect of gene dosage on development.

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Ellis, Christopher J. "A Role for Lichens in Botanic Gardens?" Sibbaldia: the International Journal of Botanic Garden Horticulture, no. 6 (October 31, 2008): 155–62. http://dx.doi.org/10.24823/sibbaldia.2008.40.

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Lichens are biologically diverse and ecologically important. They infuse a botanic garden with character, and are sensitive indicators for the health of our environment. Their continued recolonization of botanic gardens should be celebrated, yet is frequently greeted with trepidation. Acknowledging the under-played significance of lichens and other cryptogams, PlantNetwork organized a conference on Mosses, Ferns and Lichens in Gardens (September 2007). This article summarizes a talk presented at the PlantNetwork conference. It discusses the role of lichens in botanic gardens, and also includes general themes (aesthetics, monitoring and education) which may be applied across other cryptogam groups, for example mosses, liverworts, ferns and non-lichenized fungi.

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Ferguson, Anneka V., Emma J. Pharo, Jamie B. Kirkpatrick, and Jon B. Marsden-Smedley. "The early effects of fire and grazing on bryophytes and lichens in tussock grassland and hummock sedgeland in north-eastern Tasmania." Australian Journal of Botany 57, no. 7 (2009): 556. http://dx.doi.org/10.1071/bt09131.

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Little is known of the interactive effects of fire and grazing on cryptogam species and assemblages. These effects were observed for bryophyte and lichen species in Tasmanian tussock grassland and hummock sedgeland several months after experimental burning and fencing. A factorial design was used on 40 randomly located and treated pairs of 1 m × 1 m quadrats in each of the vegetation types. In total, 24 cryptogam taxa were found, with grassland having a greater taxon richness, as well as higher total cryptogam cover and a different species composition, to the hummock sedgeland. There was greater cryptogam cover in the burned quadrats than the unburned quadrats in the grassland. However, only bryophytes had different species composition between burned and unburned quadrats. There was a small but significant difference in richness in hummock sedgeland, with burned being richer than unburned. Three species were more abundant in the burned than in the unburned treatments in the grassland, whereas no species responded to treatment in the sedgeland and no species responded to grazing. The fact that no species or assemblage of species was significantly reduced in cover by the burns testifies to a high degree of cryptogam resilience to this disturbance. The total lack of negative grazing effects suggests cryptogams are not a major source of sustenance for the local vertebrate herbivores. These conclusions differ from those made elsewhere in the world.

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More sources

Dissertations / Theses on the topic "Cryptogams"

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Simmel, Josef [Verfasser], and Peter [Akademischer Betreuer] Poschlod. "Cryptogams as indicator organisms in ecology and conservation biology / Josef Simmel ; Betreuer: Peter Poschlod." Regensburg : Universitätsbibliothek Regensburg, 2017. http://d-nb.info/1125712856/34.

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Whittington-Jones, Kevin John. "Ecological interactions on a rocky shore : the control of macroalgal distribution by intertidal grazers." Thesis, Rhodes University, 1998. http://hdl.handle.net/10962/d1005350.

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The aim of the present study was to determine the potential impact of intertidal grazers on the distribution of macro algae on the south coast of South Africa. Particular attention was paid to the large patellid limpet, Patella oculus, which is found thoughout the intertidal zone. Studies of gut contents revealed that Patella oculus was capable of ingesting not only the thallus of foliose (eg. Ulva spp.) and encrusting coralline macroalgae, but also spores and diatoms. The inclusion of these relatively small particles in the diet was surprising, as electron micrographs of the radula of P.oculus revealed that it is typically docoglossan in structure. Such radulae are thought to be poorly suited for collecting small food particles. Sand made up a significantly higher proportion of the gut contents than other particles at all shore heights, which suggests that P.oculus might be capable of excavating the rocky substratum, or of sweeping up sand, while searching for food. Analysis of the gut contents of other local herbivorous molluscs, was also carried out. These species included the winkles, Oxystele variegata and O.sinensis, and the small pulmonate limpets, Siphonaria concinna, S.capensis, and S.serrata. The guts of all species contained mainly spores and diatoms, although small fragments of Ulva sp. were found. The population structure of Patella oculus was investigated at two sites, Cannon Rocks and Old Woman's River. At Cannon Rocks, mean shell length of low-shore animals was significantly lower than that of both mid- and high-shore animals, while at Old Woman's River, no significant difference was found among shore heights. A regression equation for In (shell length) vs In (dry weight) was calculated, and based on length data, the biomass density (g dry mass.m⁻²) of P.oculus at Old Woman's River was estimated. Values ranged from 2.8 on the low- and midshore to 0.37 on the high-shore. A manipulative field experiment was used to determine the impact of mesograzers and macrograzers (such as Patella oculus) on the distribution of intertidal macro algae on the mid- and low-shore at Old Woman's River. Grazers were excluded using mesh cages (mesh size = 3mm), in two separate experiments, one in winter and the other in spring. Percentage cover of macroalgal species and sessile invertebrates was estimated at approximately 6 week intervals for up to 3 months. MANOV A showed that treatments did not significantly affect cover of macroalgae or barnacles during winter. However, towards the end of the spring experiment (midshore only) cover of barnacles and green foliose turfs did increase in those plots from which mesograzers and/or macro grazers were excluded. The failure of the statistical tests to detect significant differences at some time intervals may have been caused by high levels of variation among replicates. This suggests that factors other than grazing are of overriding importance in determining the distribution of local macroalgae. The existence of a possible symbiotic relationship between Patella oculus and the red foliose alga, Gelidium pristoides, was investigated. The availability of various substratum types, including rock, limpet shells, barnacles etc., and the proportion of the total cover of G.pristoides on each, was calculated. It was shown that a significantly higher proportion of the alga grew on limpet shells, although the availability of this substratum type was low. It is thought that the aggressive behaviour of P.oculus prevents all but juvenile Patella longicosta from grazing on its shell, thus providing a refuge from grazing for G.pristoides.

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Canani, Luís Gustavo de Castro. "Diatomáceas perifíticas de cursos d´agua do Parque Estadual de Ibitipoca (PEI), Minas Gerais , Brasil: composição florística." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/142706.

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O perifíton é formado por uma complexa comunidade de organismos aderidos a um substrato orgânico ou inorgânico, dos quais as diatomáceas (Bacillariophyta) constituem importante parcela. Mais recentemente inventários florísticos que contemplam as diatomáceas bentônicas em sistemas lóticos vêm incrementando o conhecimento da flora na região Neotropical e Neosubtropical, porém grande parte desses sistemas permanece inexplorado, especialmente em águas oligotróficas, de altitude e de baixo pH. Tais ecossistemas em geral possuem uma flora bastante peculiar, e são importantes referências em termos qualidade de água. Desta forma, o presente estudo teve por objetivos contribuir para o conhecimento da flora de diatomáceas perifíticas do Parque Estadual do Ibitipoca, localizado na serra da Mantiqueira em Minas Gerais. Como resultado, foram identificados 15 gêneros, 18 espécies e duas variedades taxonômicas. Duas novas espécies do gênero Eunotia são propostas e três espécies do gênero Nupela não puderam ser identificadas de acordo com a literatura, sendo provavelmente novas para a ciência. São feitos 16 registros pioneiros para o estado de Minas Gerais, sendo quatro delas primeiras ocorrências em território brasileiro. A composição taxonômica das diatomáceas perifíticas do Parque Estadual do Ibitipoca apresenta semelhanças com a flora de outros ambientes oligo-distróficos já inventariados nos Neotrópicos. Palavras-chave: ambientes continentais, águas oligotróficas, Eunotia, Nupela, taxonomia de criptógamos.
The periphyton is composed by a complex community of organisms adhered to an organic or inorganic substrate, and diatoms (Bacillariophyta) constitute an important part of it. More recent floristic inventories in lotic systems that include benthic diatoms increased the knowledge of the Neosubtropical Neotropical flora for the region, but most environments remains unexplored, especially those with oligotrophic and low pH waters in altitude sites. Such ecosystems in general have a very peculiar flora and are important indicators of water quality. Thus, the present study aimed to contribute to the knowledge of periphytic diatom flora of Ibitipoca State Park, located in the Mantiqueira ridge, in Minas Gerais. As a result, we identified 15 genera, 18 species and two taxonomic varieties. Two new species of Eunotia are proposed and three species of the genus Nupela could not be identified according to the literature, and are probably new to science. Sixteen new records were made for the state of Minas Gerais, including four first occurrences for Brazil. The taxonomic composition of the periphytic diatoms of Ibitipoca State Park share similarities with other oligo-dystrophic environments already surveyed in the Neotropics.

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Harris, Dale Geoffrey. "Cryptograms in the music of Alban Berg." Thesis, University of Kent, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408486.

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Chisholm, Chelsea. "Cryptogam community structure and functioning along an elevational gradient." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119427.

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Biodiversity studies have recently focused on incorporating measures of phylogenetic and functional diversity into examinations of community ecology. Functional diversity describes those traits that influence the interaction between a species and the environment, whereas phylogenetic diversity is a more derived measure that represents the evolutionary history of species, and might incorporate information on functional identity, taking into account multiple traits. This thesis examined patterns in cryptogam (bryophyte and lichen) diversity across an elevation gradient to (i) evaluate the interplay between species, phylogenetic, and functional lichen diversity within and between habitats and (ii) link diversity (species and phylogenetic) to bryophyte productivity across environmental gradients. We found that phylogenetic and functional turnover correlate strongly, despite low signal in measured traits. Within and between habitats, different beta diversity indices are driven by different environmental factors, and as such one metric cannot be used as a surrogate for another. By establishing a link between diversity and productivity within bryophytes, we highlight the importance of diversity in regulating biomass production within stressful environments. We also highlight the use of alternative phylogenetic measures as descriptors of the diversity-productivity relationship, as they provide more information on the underlying mechanisms that drive the relationship. Cryptogams are relatively understudied in comparison to their vascular counterparts, and as such the information from this study will provide valuable insights into their community structure and turnover across space.
Les études sur la biodiversité ont récemment mis l'accent sur l'intégration des mesures de diversité phylogénétique et fonctionnelle dans les examens de l'écologie des communautés. La diversité fonctionnelle décrit les traits influençant l'interaction entre une espèce et l'environnement, alors que la diversité phylogénétique est une mesure dérivée représentant l'histoire de l'évolution d'une espèce et peut inclure des renseignements sur l'identité fonctionnelle d'une espèce. J'ai étudié les modèles de diversité des cryptogames (bryophytes et lichens) à travers un gradient d'altitude afin (i) d'examiner les interactions entre la diversité des espèces, la diversité phylogénétique et la diversité fonctionnelle des lichen au sein des habitats et entre eux, et (ii) de relier la diversité (des espèces et phylogénétique) à la productivité des bryophytes à travers les gradients environnementaux. Nous avons constaté que les changements de la composition phylogénétique et fonctionnelle sont fortement corrélés, malgré le faible signal dans les traits mesurés. Puisque les différents indices de diversité bêta sont entrainés par différents facteurs environnementaux au sein des habitats et entre eux, une unité de mesure ne peut être utilisée comme substitut à une autre. En établissant un lien entre la diversité et la productivité au sein des bryophytes, nous soulignons l'importance de la diversité dans la règlementation de la production de biomasse au sein d'environnements stressants. Nous appuyons également l'utilisation de mesures phylogénétiques alternatives comme descripteurs de la relation diversité-productivité, car celles-ci apportent plus d'information sur les mécanismes entrainant cette relation. Puisque les cryptogames sont relativement peu étudiés, cette étude fournit des indications précieuses sur la structure de leur communauté et leur changement de composition à travers l'espace.

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Haizel, Kwesi N. "Development of an automated cryptanalysis emulator, ACE, for classical cryptograms." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ30047.pdf.

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Gaskin, Stephen Edward. "Cryptogamic soil crusts : their distribution and role in soil erosion control in Nepal Middle Hills." Thesis, Queen Mary, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322529.

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Noakes, Timothy David. "Water relations of mosses from maritime Antarctic cryptogamic fellfields." Thesis, University of Reading, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315302.

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Zouhair, Rachid. "Etude comparative de l'organisation nucleaire et de la teneur en adn specifique de plusieurs cryptogames." Nantes, 1989. http://www.theses.fr/1989NANT2008.

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Une etude comparative de la structure nucleaire et de la teneur en adn a ete realisee chez 16 especes representatives des principaux phylums de cryptogames photosynthetiques (algues, bryophytes, pteridophytes) afin d'apprecier l'amplitude des variations inter- et intraspecifiques de l'organisation chromatinienne des noyaux interphasiques. Il a ete montre que 15 des 16 especes examinees possedent des noyaux de type diffus (areticule). Seul le codium tomentosum (chlorophycophytes) a des noyaux de type chromomerique. Au sein du type diffus trois sous-types caracterises par differents degres de densite de l'euchromatine diffuse ont pu etre distingues. La taille du genome diploide estimee par microspectrophotometrie a balayage varie de 0,7 pg pour selaginella kraussiana a 3,9 pg pour fontinalis antipyretica. Ces valeurs sont representatives de la faible proportion de chromatine condensee, rencontree dans les noyaux analyses et sont en accord avec les donnees decrites pour des types de texture chromatinienne identique chez les angiospermes. Il n'existe par ailleurs aucune relation entre le contenu en adn specifique et le nombre chromosomique. De meme, l'utilisation des fluorochromes specifiques n'a pas permis de mettre en evidence de difference manifeste dans la composition nucleotidique en bases a-t ou g-c de la chromatine condensee (chromocentres). Au cours du cycle cellulaire etudie plus particulierement sur trois especes (1 bryophyte et 2 algues), des variations mineures de l'organisation nucleaire ont ete detectees qui n'affectent pas de facon profonde le type nucleaire. Celui-ci reste le meme dans tous les territoires meristematiques ou differencies d'une meme plante. Ainsi se trouve verifie pour les cryptogames le caractere specifique de l'organisation nucleaire

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GHEZA, GABRIELE. "Dynamics and ecological functions of Cryptogam Soil Crusts (CSC) in planitial landscapes of continental-temperate regions." Doctoral thesis, Università degli studi di Pavia, 2019. http://hdl.handle.net/11571/1249550.

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Dry grasslands and heathlands are important habitats for biodiversity conservation and host cryptogam soil crusts (CSC) that greatly contribute to ecosystem functioning. This thesis aims at exploring: the terricolous lichen diversity in dry habitats in a human-impacted lowland (Po Plain, N Italy); the compositional patterns of CSC across dry grasslands and heathlands, also accounting for the dynamic stage of the vegetation (pioneer vs mature); the effects of small-scale disturbances on the three main taxa found in cryptogam-rich dry grasslands (vascular plants, lichens, bryophytes); the potential of CSC in delivering the ecosystem service of storing seeds of vascular plants, in the perspective of habitat restoration. Diversity and dynamics were studied by means of vegetation surveys in circular plots, whose number was area-dependent, located along transects in each habitat patch (= 185 plots in 60 grasslands, 114 plots in 22 heathlands). The % cover of each plant, bryophyte and lichen was recorded, with environmental (soil pH and texture, vegetation structure, altitude, bare soil %), disturbance-related (human trampling, cattle and lagomorphs fecal pellets, wild boar scratches) and climate variables (mean annual temperature and precipitation). The composition in lichens and bryophytes was compared among the 3 habitat types (3 groups) and between their dynamic stages (pioneer vs mature, 6 groups) to understand whether it is habitat- and stage-specific by means of NMDS, PERMANOVA and Indicator Species Analysis. Drivers of cover and species richness of the 3 taxa were analyzed for dry grasslands by means of generalized linear models. The seed storing function was studied taking 5 samples of CSC in 4 acidic grassland patches (= 20 samples), each sample taken at the centre of one plot surveyed in the previous spring. The samples were dryed, crumbled on sterile gardening soil in a controlled situation. All the germinated seedlings were identified and counted. Data were analyzed in comparison to data from the donor plots by means of Kruskal-Wallis test and linear regression, considering all the species and then native and non-native species separately . 33 terricolous lichen species were recorded, of which 13 of conservation concern. In spite of the widespread presence of few common species and the generally low species richness, composition differs significantly between the 3 habitat types and between pioneer vs mature heathlands, less markedly between dynamic stages within each grassland type. Three well-characterized assemblages which include many species of conservation concern were found for both lichens and bryophytes. Cryptogam assemblages are influences also by rainfall, soil features and vegetation structure. Increase of soil pH and disturbance by lagomorph fecal pellets have a negative effect on lichens, as well as their interaction (the negative effect of pellets is more evident at the increase of soil pH). Soil pH, fecal pellets and precipitation have a positive effect on bryophytes. Human trampling and fecal pellets have a negative effect on vascular plants, while increase of soil pH has a positive effect. The interaction of soil pH and pellets has an effect opposite than on lichens (the negative effect of pellets is more evident at the decrease of soil pH). CSC are able to store and release vascular plant seeds which are viable and can germinate when placed in proper conditions. The number of species and individuals of vascular plants germinated from CSC is comparable to what recorded in nature in the donor plots. Native species richness was higher, while native species germinated with less individuals than non-native species. These results are useful in addressing conservation towards the management and protection of all the lowland dry habitats, due to the differentiation among the cryptogam assemblages they host and to the presence of several species of conservation concern.
Dry grasslands and heathlands are important habitats for biodiversity conservation and host cryptogam soil crusts (CSC) that greatly contribute to ecosystem functioning. This thesis aims at exploring: the terricolous lichen diversity in dry habitats in a human-impacted lowland (Po Plain, N Italy); the compositional patterns of CSC across dry grasslands and heathlands, also accounting for the dynamic stage of the vegetation (pioneer vs mature); the effects of small-scale disturbances on the three main taxa found in cryptogam-rich dry grasslands (vascular plants, lichens, bryophytes); the potential of CSC in delivering the ecosystem service of storing seeds of vascular plants, in the perspective of habitat restoration. Diversity and dynamics were studied by means of vegetation surveys in circular plots, whose number was area-dependent, located along transects in each habitat patch (= 185 plots in 60 grasslands, 114 plots in 22 heathlands). The % cover of each plant, bryophyte and lichen was recorded, with environmental (soil pH and texture, vegetation structure, altitude, bare soil %), disturbance-related (human trampling, cattle and lagomorphs fecal pellets, wild boar scratches) and climate variables (mean annual temperature and precipitation). The composition in lichens and bryophytes was compared among the 3 habitat types (3 groups) and between their dynamic stages (pioneer vs mature, 6 groups) to understand whether it is habitat- and stage-specific by means of NMDS, PERMANOVA and Indicator Species Analysis. Drivers of cover and species richness of the 3 taxa were analyzed for dry grasslands by means of generalized linear models. The seed storing function was studied taking 5 samples of CSC in 4 acidic grassland patches (= 20 samples), each sample taken at the centre of one plot surveyed in the previous spring. The samples were dryed, crumbled on sterile gardening soil in a controlled situation. All the germinated seedlings were identified and counted. Data were analyzed in comparison to data from the donor plots by means of Kruskal-Wallis test and linear regression, considering all the species and then native and non-native species separately . 33 terricolous lichen species were recorded, of which 13 of conservation concern. In spite of the widespread presence of few common species and the generally low species richness, composition differs significantly between the 3 habitat types and between pioneer vs mature heathlands, less markedly between dynamic stages within each grassland type. Three well-characterized assemblages which include many species of conservation concern were found for both lichens and bryophytes. Cryptogam assemblages are influences also by rainfall, soil features and vegetation structure. Increase of soil pH and disturbance by lagomorph fecal pellets have a negative effect on lichens, as well as their interaction (the negative effect of pellets is more evident at the increase of soil pH). Soil pH, fecal pellets and precipitation have a positive effect on bryophytes. Human trampling and fecal pellets have a negative effect on vascular plants, while increase of soil pH has a positive effect. The interaction of soil pH and pellets has an effect opposite than on lichens (the negative effect of pellets is more evident at the decrease of soil pH). CSC are able to store and release vascular plant seeds which are viable and can germinate when placed in proper conditions. The number of species and individuals of vascular plants germinated from CSC is comparable to what recorded in nature in the donor plots. Native species richness was higher, while native species germinated with less individuals than non-native species. These results are useful in addressing conservation towards the management and protection of all the lowland dry habitats, due to the differentiation among the cryptogam assemblages they host and to the presence of several species of conservation concern.

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Books on the topic "Cryptogams"

1

Botanical Expedition to the Himalayas and Adjacent Areas. Cryptogams of the Himalayas. Tsukuba, Japan: Dept. of Botany, National Science Museum, 1988.

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Winkler, Jana Barbro. Die Rolle der Schneebedeckung für die Kryptogamen-Vegetation in der maritimen Antarktis (Potter-Halbinsel, King George Island) =: The role of snowcover on the cryptogamic vegetation in the maritime Antarctic (Potter Peninsula, King George Island). Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung, 2000.

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Esser, Karl. Kryptogamen: Cyanobakterien, Algen, Pilze, Flechten : Praktikum und Lehrbuch. 2nd ed. Berlin: Springer-Verlag, 1986.

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1955-, Atri N. S., ed. Germplasm diversity and evaluation: Algae, fungi, and lichens. Dehra Dun: Bishen Singh Mahendra Pal Singh, 2009.

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1955-, Atri N. S., ed. Germplasm diversity and evaluation: Algae, fungi, and lichens. Dehra Dun: Bishen Singh Mahendra Pal Singh, 2009.

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Parnell, J. Isaac Carroll's cryptogamic flora of County Cork. Dublin: National Botanic Gardens, 1992.

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1955-, Atri N. S., ed. Germplasm diversity and evaluation: Algae, fungi, and lichens. Dehra Dun: Bishen Singh Mahendra Pal Singh, 2009.

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1955-, Atri N. S., ed. Germplasm diversity and evaluation: Algae, fungi, and lichens. Dehra Dun: Bishen Singh Mahendra Pal Singh, 2009.

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A, Safonova T., and Ri︠a︡bt︠s︡ev V. V, eds. Sporovye rastenii︠a︡ Pribaĭkalʹskogo nat︠s︡ionalʹnogo parka. Novosibirsk: Geo, 2008.

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A, Safonova T., and Ri︠a︡bt︠s︡ev V. V, eds. Sporovye rastenii︠a︡ Pribaĭkalʹskogo nat︠s︡ionalʹnogo parka. Novosibirsk: Geo, 2008.

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Book chapters on the topic "Cryptogams"

1

Büdel, Burkhard, and Thomas Friedl. "Introduction: The New Cryptogams." In Biology of Algae, Lichens and Bryophytes, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2024. http://dx.doi.org/10.1007/978-3-662-65712-6_1.

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Zamani, Sabiha, Babita Jha, Anal K. Jha, and Kamal Prasad. "Nanofabrication by Cryptogams: Exploring the Unexplored." In Exploring the Realms of Nature for Nanosynthesis, 81–108. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99570-0_5.

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Jaenicke, Lothar. "Development: Signals in the Development of Cryptogams." In Progress in Botany, 138–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76293-2_9.

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Bilger, Wolfgang. "Desiccation-Induced Quenching of Chlorophyll Fluorescence in Cryptogams." In Advances in Photosynthesis and Respiration, 409–20. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9032-1_19.

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Wynn-Williams, D. D. "Potential effects of ultraviolet radiation on Antarctic primary terrestrial colonizers: Cyanobacteria, algae, and cryptogams." In Ultraviolet Radiation in Antarctica: Measurements and Biological Effects, 243–57. Washington, D. C.: American Geophysical Union, 1994. http://dx.doi.org/10.1029/ar062p0243.

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Schroeter, B., T. G. A. Green, L. Kappen, R. D. Seppelt, and K. Maseyk. "The Relationship between Electron Transport Rate Through PS II and CO2 Gas Exchange in Antarctic Cryptogams." In Photosynthesis: from Light to Biosphere, 4785–88. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_1121.

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Schroeter, B., T. G. A. Green, L. Kappen, R. D. Seppelt, and K. Maseyk. "The Relationship between Electron Transport Rate through PS II and CO2 Gas Exchange in Antarctic Cryptogams." In Photosynthesis: from Light to Biosphere, 1937–40. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_455.

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Owfi, Reza E. "Cryptogamaes—Pteridophytes." In Natural Products and Botanical Medicines of Iran, 209–18. First edition. | Boca Raton : CRC Press, 2020. | Series: Natural products chemistry of global plants: CRC Press, 2020. http://dx.doi.org/10.1201/9781003008996-7.

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Price, Steven. "The Cryptogram (1994)." In The Plays, Screenplays and Films of David Mamet, 123–27. London: Macmillan Education UK, 2008. http://dx.doi.org/10.1007/978-1-137-05033-5_16.

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Petsche, Hellmuth. "The EEG—A Cryptogram?" In Basic Mechanisms of the EEG, 13–27. Boston, MA: Birkhäuser Boston, 1993. http://dx.doi.org/10.1007/978-1-4612-0341-4_2.

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Conference papers on the topic "Cryptogams"

1

Davydov, D. A. "Comparative characteristics of the European and Asian Arctic cyanoprokaryotes floras." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-1-2.

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Kazanovsky, S. G., E. S. Prelovskaya, O. Yu Pisarenko, and N. V. Dudareva. "The degree of knowledge of the moss flora of the Altai-Sayan highlands and the western part of the Baikal highlands." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-10-12.

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Koltysheva, D. E., and V. E. Fedosov. "Changes in the composition of the alpine lichen heaths moss cover with an increase of the mineral nutrition availability." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-13-15.

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Kuzmina, E. Yu. "Briological studies in Northern Koryakia (Koryakskiy District, Kamchatka Territory)." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-16-17.

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Kulakova, N. V., and I. N. Egorova. "Comparative analysis of molecular markers for identification of green microalgae (Chlorophyta)." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-18-19.

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Morozova, T. I., and N. S. Berezhnaya. "Current issues of scientific and methodological support of training programs on forest quarantine." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-20-25.

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Romanov, R. E. "CHAROPHYTES (CHARALES, CHAROPHYCEAE) FROM NORTH-EASTERN AND CENTRAL EURASIA." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-26-27.

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Egorova, I. N., E. N. Maksimova, and G. S. Shambueva. "Studies of terrestrial algae in the Baikal region." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-3-7.

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Isakova, V. G., E. I. Ivanova, and E. V. Sofronova. "Bryophytes in Red Data Book of the Republic of Sakha (Yakutia)." In The international field workshop «Cryptogams of North Asia». SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/cna.irk-8-9.

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Huang, G., E. Learned-Miller, and A. McCallum. "Cryptogram Decoding for OCR Using Numerization Strings." In Ninth International Conference on Document Analysis and Recognition (ICDAR 2007). IEEE, 2007. http://dx.doi.org/10.1109/icdar.2007.4378705.

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Reports on the topic "Cryptogams"

1

MITCHELL, R. M. Utilization of Coyotes & Cryptogams as Biological Indicators of Radionuclide Uptake. Office of Scientific and Technical Information (OSTI), August 2001. http://dx.doi.org/10.2172/807265.

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2

Landeen, D. S. Comparison of radionuclide levels in soil, sagebrush, plant litter, cryptogams, and small mammals. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10189845.

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Lichvar, Robert, Charles Racine, Barbara Murray, Gerry Tande, and Rob Lipkin. A Floristic Inventory of Vascular and Cryptogam Plant Species at Fort Richardson, Alaska. Fort Belvoir, VA: Defense Technical Information Center, March 1997. http://dx.doi.org/10.21236/ada324193.

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