Willem O Van Der Knaap
Dados Biográficos
| ID | 3469408 |
|---|---|
| NOME | Willem O Van Der Knaap |
| PRENOMES | Willem |
| SOBRENOME | O Van Der Knaap |
| ASSINATURA | VAN DER KNAAP W O |
| AFILIAÇÕES | University of Bern |
| ORCID | 0000-0002-0179-7440 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 37 |
| TOTAL DE CITAÇÕES | 161 |
| TOTAL COMO AUTOR | 37 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1993 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2023 |
| ÍNDICE H | 7 |
Contribution to Neotoma
The Würmian Late-Glacial and early-Holocene vegetation and environment of Gourds des Aillères in the Monts du Forez (Massif Central, France) based on pollen and macrofossil evidence
Holocene vegetation succession and forest history in the upper Monts du Forez, Massif Central, France
Holocene vegetation, fire and land use dynamics at Lake Svityaz, an agriculturally marginal site in northwestern Ukraine
The online version contains supplementary material available at 10.1007/s00334-021-00844-z
Pollen and plant diversity relationships in a Mediterranean montane area
Humans take control of fire-driven diversity changes in Mediterranean Iberia’s vegetation during the mid–late Holocene
Fire regime changes are considered a major threat to future biodiversity in the Mediterranean Basin. Such predictions remain uncertain, given that fire regime changes and their ecological impacts occur over timescales that are too long for direct observation. Here we analyse centennial- and millennial-scale shifts in fire regimes and compositional turnover to track the consequences of fire regime shifts on Mediterranean vegetation diversity. We e…
Vegetation and disturbance history of the Bavarian Forest National Park, Germany
Millennial multi-proxy reconstruction of oasis dynamics in Jordan, by the Dead Sea
Holocene vegetation and fire history of the mountains of Northern Sicily (Italy)
Present-day vegetation and the Holocene and recent development of Egelsee-Moor, Salzburg province, Austria
Palaeoenvironmental changes in Central Europe (NE Poland) during the last 6200 years reconstructed from a high-resolution multi-proxy peat archive
Peat deposits from an ombrotrophic bog (north-eastern Poland) were analysed to reconstruct peatland development and environmental changes. This paper presents reconstructions of hydrological changes and plant succession over the last 6000 years. The methods included the high-resolution analysis of plant macrofossils, pollen and testate amoebae, supported by radiocarbon dating. Three main phases were identified in the history of the bog and surrou…
The potential of stomata analysis in conifers to estimate presence of conifer trees
The performance of single- and multi-proxy transfer functions (testate amoebae, bryophytes, vascular plants) for reconstructing mire surface wetness and pH
Peatlands are widely exploited archives of paleoenvironmental change. We developed and compared multiple transfer functions to infer peatland depth to the water table (DWT) and pH based on testate amoeba (percentages, or presence/absence), bryophyte presence/absence, and vascular plant presence/absence data from sub-alpine peatlands in the SE Swiss Alps in order to 1) compare the performance of single-proxy vs. multi-proxy models and 2) assess th…
Towards mapping the late Quaternary vegetation change of Europe
The number of well-dated pollen diagrams in Europe has increased considerably over the last 30 years and many of them have been submitted to the European Pollen Database (EPD). This allows for the construction of increasingly precise maps of Holocene vegetation change across the continent. Chronological information in the EPD has been expressed in uncalibrated radiocarbon years, and most chronologies to date are based on this time scale. Here we …
The European Modern Pollen Database (EMPD) project
Human impact on vegetation at the Alpine tree-line ecotone during the last millennium
Holocene land-cover reconstructions for studies on land cover-climate feedbacks
The major objectives of this paper are: (1) to review the pros and cons of the scenarios of past anthropogenic land cover change (ALCC) developed during the last ten years, (2) to discuss issues related to pollen-based reconstruction of the past land-cover and introduce a new method, REVEALS (Regional Estimates of VEgetation Abundance from Large Sites), to infer long-term records of past land-cover from pollen data, (3) to present a new project (…
Effects of climatic change and bog development on Holocene tufa formation in the Lorze Valley (central Switzerland)
A massive tufa complex in the lower Lorze Valley (550 m a.s.l., north-central Switzerland) formed between 9000 and 5000 cal. yr BP. In the plain 4 km southeast of the complex lies Neugrundmoor (830 m a.s.l.), a mire in the hydrologic recharge area of the springs responsible for the tufa formation. Here we address an earlier, untested hypothesis that the transition of Neugrundmoor from fen to raised bog caused the end of the tufa formation, by mea…
From early pollen trapping experiments to the Pollen Monitoring Programme
Pollen monitoring has become a standard investigation method for researchers in several disciplines; among them are Quaternary palynologists, who conduct experiments in order to gain insights that will help to interpret the content of pollen in sediments. A review of the literature shows how these experiments diversified during the 1920s and 1930s with an array of different research questions, ranging from pollination biology to hay fever studies…
Towards quantitative palynology
The name Sheila Hicks is for many palaeoecologists connected with pollen trapping and absolute pollen deposition, and it is therefore an enormous pleasure to dedicate this special issue of Vegetation History and Archaeobotany to Sheila Hicks on the occasion of her retirement from Oulu University. Over the years Sheila’s enthusiasm for pollen trapping has inspired many graduate students as well as junior and senior colleagues and friends. Sheila s…
Variation in annual pollen accumulation rates of Fagus along a N–S transect in Europe based on pollen traps
Annual pollen-accumulation rates (PAR) of Fagus (beech) obtained within the framework of the Pollen Monitoring Programme (PMP) were analyzed in pollen traps along a N–S transect from the Baltic Sea to the Black Sea in different European vegetation units. The study regions are situated in the lowlands of northern Poland, the uplands of SE Poland, the Czech Krkonoše Mts, the Czech Šumava Mts, the Swiss Jura Mts, the Swiss Alps, the Bulgarian Rila M…
The development of composite dispersal functions for estimating absolute pollen productivity in the Swiss Alps
Annual pollen traps reveal the complexity of climatic control on pollen productivity in Europe and the Caucasus
Annual PAR (pollen accumulation rates; grains cm−2 year−1) were studied with modified Tauber traps situated in ten regions, in Poland (Roztocze), the Czech Republic (two regions in Krkonoše, two in Šumava), Switzerland (4 regions in the Alps), and Georgia (Lagodekhi). The time-series are 10–16 years long, all ending in 2007. We calculated correlations between pollen data and climate. Pollen data are PAR summarized per region (4–7 traps selected p…
Comparing pollen spectra from modified Tauber traps and moss samples
This paper compares pollen spectra derived from modified Tauber traps and moss samples from a selection of woodland types from Bulgaria, the Czech Republic, Georgia, Greece, Poland, Switzerland and Wales. The study examines the representation of individual taxa in the two sampling media and aims to ascertain the duration of pollen deposition captured by a moss. The latter aim was pursued through the calculation of dissimilarity indexes to assess …
Holocene environmental and climatic changes at Gorgo Basso, a coastal lake in southern Sicily, Italy
Towards mapping the late Quaternary vegetation change of Europe
The number of well-dated pollen diagrams in Europe has increased considerably over the last 30 years and many of them have been submitted to the European Pollen Database (EPD). This allows for the construction of increasingly precise maps of Holocene vegetation change across the continent. Chronological information in the EPD has been expressed in uncalibrated radiocarbon years, and most chronologies to date are based on this time scale. Here we …
Comparing pollen spectra from modified Tauber traps and moss samples
This paper compares pollen spectra derived from modified Tauber traps and moss samples from a selection of woodland types from Bulgaria, the Czech Republic, Georgia, Greece, Poland, Switzerland and Wales. The study examines the representation of individual taxa in the two sampling media and aims to ascertain the duration of pollen deposition captured by a moss. The latter aim was pursued through the calculation of dissimilarity indexes to assess …
The European Modern Pollen Database (EMPD) project
Annual pollen traps reveal the complexity of climatic control on pollen productivity in Europe and the Caucasus
Annual PAR (pollen accumulation rates; grains cm−2 year−1) were studied with modified Tauber traps situated in ten regions, in Poland (Roztocze), the Czech Republic (two regions in Krkonoše, two in Šumava), Switzerland (4 regions in the Alps), and Georgia (Lagodekhi). The time-series are 10–16 years long, all ending in 2007. We calculated correlations between pollen data and climate. Pollen data are PAR summarized per region (4–7 traps selected p…
Holocene vegetation and fire history of the mountains of Northern Sicily (Italy)
The potential of stomata analysis in conifers to estimate presence of conifer trees
Variation in annual pollen accumulation rates of Fagus along a N–S transect in Europe based on pollen traps
Annual pollen-accumulation rates (PAR) of Fagus (beech) obtained within the framework of the Pollen Monitoring Programme (PMP) were analyzed in pollen traps along a N–S transect from the Baltic Sea to the Black Sea in different European vegetation units. The study regions are situated in the lowlands of northern Poland, the uplands of SE Poland, the Czech Krkonoše Mts, the Czech Šumava Mts, the Swiss Jura Mts, the Swiss Alps, the Bulgarian Rila M…
The palaeoecological history of the Praz-Rodet bog (Swiss Jura) based on pollen, plant macrofossils and testate amoebae (Protozoa)
Stratigraphy, radiocarbon dating and analyses of pollen, plant macrofossils and testate amoebae were used to reconstruct the development and ecology of a small raised bog in a karst-dominated landscape in the Swiss Jura Mountains. Special focus was on past vegetation and on the history of Pinus rotundata in relation to anthropogenic and climatic influences. Testate amoebae were used to reconstruc-t past local soil pH and water-table depth. The in…
Palaeoenvironmental changes in Central Europe (NE Poland) during the last 6200 years reconstructed from a high-resolution multi-proxy peat archive
Peat deposits from an ombrotrophic bog (north-eastern Poland) were analysed to reconstruct peatland development and environmental changes. This paper presents reconstructions of hydrological changes and plant succession over the last 6000 years. The methods included the high-resolution analysis of plant macrofossils, pollen and testate amoebae, supported by radiocarbon dating. Three main phases were identified in the history of the bog and surrou…
Vegetation and disturbance history of the Bavarian Forest National Park, Germany
Pollen productivity estimates for quantitative reconstruction of vegetation cover on the Swiss Plateau
We present the first step to quantitatively reconstruct vegetation cover in central Europe. Modern vegetation and pollen deposition were compared for 20 small to medium sized lakes and their catchments on the Swiss Plateau, a relatively flat region between the Jura Mountains and the Alps. To correct for the pollen dispersal bias in pollen assemblages, vegetation abundance was distance-weighted using three different approaches. The Relevant Source…
A Late-glacial and Holocene record of climatic change from a Swiss peat humification profile
Colorimetric measurements of alkaline extracts from two Swiss peat cores have provided a complete 14500-year-long record of peat humification, a proxy of effective precipitation. Peat from the cold Younger Dryas (11050–9550 cal. bc) was well preserved despite low levels of precipitation. A particularly dry period, peaking at c. 7100 cal. bc, is indicated by well-decomposed peat. Peat from c. 6750–4250 cal. bc shows a low degree of decomposition, …
Humans take control of fire-driven diversity changes in Mediterranean Iberia’s vegetation during the mid–late Holocene
Fire regime changes are considered a major threat to future biodiversity in the Mediterranean Basin. Such predictions remain uncertain, given that fire regime changes and their ecological impacts occur over timescales that are too long for direct observation. Here we analyse centennial- and millennial-scale shifts in fire regimes and compositional turnover to track the consequences of fire regime shifts on Mediterranean vegetation diversity. We e…
From early pollen trapping experiments to the Pollen Monitoring Programme
Pollen monitoring has become a standard investigation method for researchers in several disciplines; among them are Quaternary palynologists, who conduct experiments in order to gain insights that will help to interpret the content of pollen in sediments. A review of the literature shows how these experiments diversified during the 1920s and 1930s with an array of different research questions, ranging from pollination biology to hay fever studies…
The development of composite dispersal functions for estimating absolute pollen productivity in the Swiss Alps
Characterizing carbon isotopic variability in Sphagnum
To understand more fully the nature of isotopic fractionation in mosses and to explore the potential of stable isotope analyses of selected peat constituents for palaeoenvironmental research, we present results from a study of inter- and intra-plant δ 13 C variability in Sphagnum spp. Subdivisions of stem, pendant and horizontal branch elements of modern Sphagnum capillifolium plants revealed consistent and statistically significant differences i…
Climate-pollen relationships AD 1901–1996 in two small mires near the forest limit in the northern and central Swiss Alps
Climatic relationships were established in two 210 Pb dated pollen sequences from small mires closely surrounded by forest just below actual forest limits (but about 300 m below potential climatic forest limits) in the northern Swiss Alps (suboceanic in climate; mainly with Picea) and the central Swiss Alps (subcontinental; mainly Pinus cembra and Larix) at annual or near-annual resolution from ad 1901 to 1996. Effects of vegetational succession …
Pollen and plant diversity relationships in a Mediterranean montane area
Human impact on vegetation at the Alpine tree-line ecotone during the last millennium
A three thousand year succession of plant communities on a valley bottom in the Vosges Mountains, NE France, reconstructed from fossil pollen, plant macrofossils, and modern phytosociological communit…
Towards quantitative palynology
The name Sheila Hicks is for many palaeoecologists connected with pollen trapping and absolute pollen deposition, and it is therefore an enormous pleasure to dedicate this special issue of Vegetation History and Archaeobotany to Sheila Hicks on the occasion of her retirement from Oulu University. Over the years Sheila’s enthusiasm for pollen trapping has inspired many graduate students as well as junior and senior colleagues and friends. Sheila s…
Estimating pollen diversity from pollen accumulation rates
A new method is presented to estimate pollen diversity on the basis of pollen-accumulation rates, rather than on a constant count of pollen as is traditional. Accumulation-based estimates of pollen diversity can be interpreted in terms of taxonomic richness on the landscape. The traditionally used constant-count estimates, on the other hand, reflect the evenness in the vegetation much more than its taxonomic richness, but they reflect this in a d…
A recent pollen diagram from Antarctica (King George Island, South Shetland Islands)
A pollen diagram from King George Island, South Shetland Islands, is presented; it is the first from the Antarctic region. A basal radiocarbon date indicates a calibrated age of 300 years or less. Pollen of one or both of the native vascular plants and many long-distance transported types, mainly Nothofagus, are present in all samples. A total of 37 long-distance transported pollen and spore types were encountered in the samples from the section …
Holocene vegetation, fire and land use dynamics at Lake Svityaz, an agriculturally marginal site in northwestern Ukraine
The online version contains supplementary material available at 10.1007/s00334-021-00844-z
The effect of climate variability on pollen productivity, AD 1975-2000, recorded in a Sphagnum peat hummock
Pollen accumulation rates and pollen percentages from a Sphagnum peat hummock in the Jura Mountains were used to determine past pollen deposition. Post-bomb calibrated radiocarbon dates allowed estimations of annual variability in pollen productivity AD 1975-2000. Percentages of abundant taxa were modified (downweighted) to reduce the influence of plant cover, mean pollen productivity, and interdependence of the variables. Significant correlation…
A recent pollen diagram from Antarctica (King George Island, South Shetland Islands)
A pollen diagram from King George Island, South Shetland Islands, is presented; it is the first from the Antarctic region. A basal radiocarbon date indicates a calibrated age of 300 years or less. Pollen of one or both of the native vascular plants and many long-distance transported types, mainly Nothofagus, are present in all samples. A total of 37 long-distance transported pollen and spore types were encountered in the samples from the section …
History of Atmospheric Lead Deposition Since 12,370 14 C yr BP from a Peat Bog, Jura Mountains, Switzerland
A continuous record of atmospheric lead since 12,370 carbon-14 years before the present ( 14 C yr BP) is preserved in a Swiss peat bog. Enhanced fluxes caused by climate changes reached their maxima 10,590 14 C yr BP (Younger Dryas) and 8230 14 C yr BP. Soil erosion caused by forest clearing and agricultural tillage increased lead deposition after 5320 14 C yr BP. Increasing lead/scandium and decreasing lead-206/lead-207 beginning 3000 14 C yr BP…
The palaeoecological history of the Praz-Rodet bog (Swiss Jura) based on pollen, plant macrofossils and testate amoebae (Protozoa)
Stratigraphy, radiocarbon dating and analyses of pollen, plant macrofossils and testate amoebae were used to reconstruct the development and ecology of a small raised bog in a karst-dominated landscape in the Swiss Jura Mountains. Special focus was on past vegetation and on the history of Pinus rotundata in relation to anthropogenic and climatic influences. Testate amoebae were used to reconstruc-t past local soil pH and water-table depth. The in…
Climate-pollen relationships AD 1901–1996 in two small mires near the forest limit in the northern and central Swiss Alps
Climatic relationships were established in two 210 Pb dated pollen sequences from small mires closely surrounded by forest just below actual forest limits (but about 300 m below potential climatic forest limits) in the northern Swiss Alps (suboceanic in climate; mainly with Picea) and the central Swiss Alps (subcontinental; mainly Pinus cembra and Larix) at annual or near-annual resolution from ad 1901 to 1996. Effects of vegetational succession …
A Late-glacial and Holocene record of climatic change from a Swiss peat humification profile
Colorimetric measurements of alkaline extracts from two Swiss peat cores have provided a complete 14500-year-long record of peat humification, a proxy of effective precipitation. Peat from the cold Younger Dryas (11050–9550 cal. bc) was well preserved despite low levels of precipitation. A particularly dry period, peaking at c. 7100 cal. bc, is indicated by well-decomposed peat. Peat from c. 6750–4250 cal. bc shows a low degree of decomposition, …
A new scenario for the Quaternary history of European beech populations
Here, palaeobotanical and genetic data for common beech (Fagus sylvatica) in Europe are used to evaluate the genetic consequences of long-term survival in refuge areas and postglacial spread. Four large datasets are presented, including over 400 fossil-pollen sites, 80 plant-macrofossil sites, and 450 and 600 modern beech populations for chloroplast and nuclear markers, respectively. The largely complementary palaeobotanical and genetic data indi…
Holocene timber-line dynamics at Bachalpsee, a lake at 2265 m a.s.l. in the northern Swiss Alps
The effect of climate variability on pollen productivity, AD 1975-2000, recorded in a Sphagnum peat hummock
Pollen accumulation rates and pollen percentages from a Sphagnum peat hummock in the Jura Mountains were used to determine past pollen deposition. Post-bomb calibrated radiocarbon dates allowed estimations of annual variability in pollen productivity AD 1975-2000. Percentages of abundant taxa were modified (downweighted) to reduce the influence of plant cover, mean pollen productivity, and interdependence of the variables. Significant correlation…
A three thousand year succession of plant communities on a valley bottom in the Vosges Mountains, NE France, reconstructed from fossil pollen, plant macrofossils, and modern phytosociological communit…
Pollen productivity estimates for quantitative reconstruction of vegetation cover on the Swiss Plateau
We present the first step to quantitatively reconstruct vegetation cover in central Europe. Modern vegetation and pollen deposition were compared for 20 small to medium sized lakes and their catchments on the Swiss Plateau, a relatively flat region between the Jura Mountains and the Alps. To correct for the pollen dispersal bias in pollen assemblages, vegetation abundance was distance-weighted using three different approaches. The Relevant Source…
Characterizing carbon isotopic variability in Sphagnum
To understand more fully the nature of isotopic fractionation in mosses and to explore the potential of stable isotope analyses of selected peat constituents for palaeoenvironmental research, we present results from a study of inter- and intra-plant δ 13 C variability in Sphagnum spp. Subdivisions of stem, pendant and horizontal branch elements of modern Sphagnum capillifolium plants revealed consistent and statistically significant differences i…
Holocene environmental and climatic changes at Gorgo Basso, a coastal lake in southern Sicily, Italy
Estimating pollen diversity from pollen accumulation rates
A new method is presented to estimate pollen diversity on the basis of pollen-accumulation rates, rather than on a constant count of pollen as is traditional. Accumulation-based estimates of pollen diversity can be interpreted in terms of taxonomic richness on the landscape. The traditionally used constant-count estimates, on the other hand, reflect the evenness in the vegetation much more than its taxonomic richness, but they reflect this in a d…
Holocene land-cover reconstructions for studies on land cover-climate feedbacks
The major objectives of this paper are: (1) to review the pros and cons of the scenarios of past anthropogenic land cover change (ALCC) developed during the last ten years, (2) to discuss issues related to pollen-based reconstruction of the past land-cover and introduce a new method, REVEALS (Regional Estimates of VEgetation Abundance from Large Sites), to infer long-term records of past land-cover from pollen data, (3) to present a new project (…
Effects of climatic change and bog development on Holocene tufa formation in the Lorze Valley (central Switzerland)
A massive tufa complex in the lower Lorze Valley (550 m a.s.l., north-central Switzerland) formed between 9000 and 5000 cal. yr BP. In the plain 4 km southeast of the complex lies Neugrundmoor (830 m a.s.l.), a mire in the hydrologic recharge area of the springs responsible for the tufa formation. Here we address an earlier, untested hypothesis that the transition of Neugrundmoor from fen to raised bog caused the end of the tufa formation, by mea…
From early pollen trapping experiments to the Pollen Monitoring Programme
Pollen monitoring has become a standard investigation method for researchers in several disciplines; among them are Quaternary palynologists, who conduct experiments in order to gain insights that will help to interpret the content of pollen in sediments. A review of the literature shows how these experiments diversified during the 1920s and 1930s with an array of different research questions, ranging from pollination biology to hay fever studies…
Towards quantitative palynology
The name Sheila Hicks is for many palaeoecologists connected with pollen trapping and absolute pollen deposition, and it is therefore an enormous pleasure to dedicate this special issue of Vegetation History and Archaeobotany to Sheila Hicks on the occasion of her retirement from Oulu University. Over the years Sheila’s enthusiasm for pollen trapping has inspired many graduate students as well as junior and senior colleagues and friends. Sheila s…
Variation in annual pollen accumulation rates of Fagus along a N–S transect in Europe based on pollen traps
Annual pollen-accumulation rates (PAR) of Fagus (beech) obtained within the framework of the Pollen Monitoring Programme (PMP) were analyzed in pollen traps along a N–S transect from the Baltic Sea to the Black Sea in different European vegetation units. The study regions are situated in the lowlands of northern Poland, the uplands of SE Poland, the Czech Krkonoše Mts, the Czech Šumava Mts, the Swiss Jura Mts, the Swiss Alps, the Bulgarian Rila M…
The development of composite dispersal functions for estimating absolute pollen productivity in the Swiss Alps
Annual pollen traps reveal the complexity of climatic control on pollen productivity in Europe and the Caucasus
Annual PAR (pollen accumulation rates; grains cm−2 year−1) were studied with modified Tauber traps situated in ten regions, in Poland (Roztocze), the Czech Republic (two regions in Krkonoše, two in Šumava), Switzerland (4 regions in the Alps), and Georgia (Lagodekhi). The time-series are 10–16 years long, all ending in 2007. We calculated correlations between pollen data and climate. Pollen data are PAR summarized per region (4–7 traps selected p…
Comparing pollen spectra from modified Tauber traps and moss samples
This paper compares pollen spectra derived from modified Tauber traps and moss samples from a selection of woodland types from Bulgaria, the Czech Republic, Georgia, Greece, Poland, Switzerland and Wales. The study examines the representation of individual taxa in the two sampling media and aims to ascertain the duration of pollen deposition captured by a moss. The latter aim was pursued through the calculation of dissimilarity indexes to assess …
Human impact on vegetation at the Alpine tree-line ecotone during the last millennium
The performance of single- and multi-proxy transfer functions (testate amoebae, bryophytes, vascular plants) for reconstructing mire surface wetness and pH
Peatlands are widely exploited archives of paleoenvironmental change. We developed and compared multiple transfer functions to infer peatland depth to the water table (DWT) and pH based on testate amoeba (percentages, or presence/absence), bryophyte presence/absence, and vascular plant presence/absence data from sub-alpine peatlands in the SE Swiss Alps in order to 1) compare the performance of single-proxy vs. multi-proxy models and 2) assess th…
Towards mapping the late Quaternary vegetation change of Europe
The number of well-dated pollen diagrams in Europe has increased considerably over the last 30 years and many of them have been submitted to the European Pollen Database (EPD). This allows for the construction of increasingly precise maps of Holocene vegetation change across the continent. Chronological information in the EPD has been expressed in uncalibrated radiocarbon years, and most chronologies to date are based on this time scale. Here we …
The European Modern Pollen Database (EMPD) project
Geography (34 obras) · Biology (30 obras) · Geology and Paleoclimatology Research (30 obras) · Ecology (29 obras) · Physical geography (27 obras) · Pollen (27 obras) · Geology (21 obras) · Lichen and fungal ecology (18 obras) · Vegetation (pathology (17 obras) · Holocene (16 obras)