This study concerns the stand-scale palaeoe-cological reconstruction of the subsequent stages of ... more This study concerns the stand-scale palaeoe-cological reconstruction of the subsequent stages of late Holocene vegetation development on habitats recently covered by beech-dominated woodland in the southern Baltic region. The data, based on pollen, non-pollen paly-nomorphs, macrofossil and charcoal analyses from two close-lying sites, demonstrated that each of the subsequent late Holocene shifts in dominating forest communities took place because of human impact coupled with climatic events or episodic human-made disturbances. Shifts from the Tilia dominated forest to the Quercus-Corylus plant community at around 3300 BC was most probably driven by the coupled effect of climate change and human activity. Human impact was the primary driver of the final Corylus decline and concurrent major Carpinus expansion at c. 460 BC, and the Carpinus decline followed by Fagus expansion at c. AD 900. Carpinus had been lingering on the edge of a major expansion in the local forest for at least 2,500 years while Fagus had persisted in a small admixture for no fewer than 1,500 years before becoming important forest constituents. Our data illustrate the role of episodic disturbances as turning points that initiate long-term vegetation changes.
Pollen productivity estimates of individual plant taxa are necessary when determining changes of ... more Pollen productivity estimates of individual plant taxa are necessary when determining changes of vegetation cover during the Holocene. To date, studies describing this parameter in lowland temperate Europe have been carried out in cultural landscapes showing low forest cover and dominated by human activities. However, these may be of limited use when applied to reconstruct past land cover, for instance, from pre-agricultural landscapes. The aim of this paper is to ascertain whether pollen productivity from the closed-canopy old-growth forest in the Białowieża National Park, Poland, where human impact has been minimal for nearly a century, is different from that calculated in much more open landscapes. We ask: how much does forest antiquity and structure influence the amount of pollen released from particular taxa? We implemented maximum likelihood estimation of relative pollen productivity for seven tree species and for Poaceae using 18 modern pollen assemblages and distance-weighted plant abundances. Our results demonstrate that the ratio of pollen productivity between high producers (Pinus sylvestris and Quercus robur) and low producers (Poaceae, Corylus avellana) is on an average six times greater in Białowieża than across other European cultural landscapes. Pollen from forest Poaceae and C. avellana is six times more under-represented in old-growth forest than hitherto estimated from cultural landscapes. This finding reinforces the idea that pollen productivity can vary in response to changes in the prevailing environmental settings and we present for the first time a quantification of this variability, likely induced by differences in light availability.
ABSTRACT AimWe used combined palaeobotanical and genetic data to assess whether Norway spruce (Pi... more ABSTRACT AimWe used combined palaeobotanical and genetic data to assess whether Norway spruce (Picea abies) and Siberian spruce (Picea obovata), two major components of the Eurasian boreal forests, occupied separate glacial refugia, and to test previous hypotheses on their distinction, geographical delimitation and introgression.LocationThe range of Norway spruce in northern Europe and Siberian spruce in northern Asia.Methods Pollen data and recently compiled macrofossil records were summarized for the Last Glacial Maximum (LGM), late glacial and Holocene. Genetic variation was assessed in 50 populations using one maternally (mitochondrial nad1) and one paternally (chloroplast trnT–trnL) inherited marker and analysed using spatial analyses of molecular variance (SAMOVA).ResultsMacrofossils showed that spruce was present in both northern Europe and Siberia at the LGM. Congruent macrofossil and pollen data from the late glacial suggested widespread expansions of spruce in the East European Plain, West Siberian Plain, southern Siberian mountains and the Baikal region. Colonization was largely completed during the early Holocene, except in the formerly glaciated area of northern Europe. Both DNA markers distinguished two highly differentiated groups that correspond to Norway spruce and Siberian spruce and coincide spatially with separate LGM spruce occurrences. The division of the mtDNA variation was geographically well defined and occurred to the east of the Ural Mountains along the Ob River, whereas the cpDNA variation showed widespread admixture. Genetic diversity of both DNA markers was higher in western than in eastern populations.Main conclusionsNorth Eurasian Norway spruce and Siberian spruce are genetically distinct and occupied separate LGM refugia, Norway spruce on the East European Plain and Siberian spruce in southern Siberia, where they were already widespread during the late glacial. They came into contact in the basin of the Ob River and probably hybridized. The lower genetic diversity in the eastern populations may indicate that Siberian spruce suffered more from past climatic fluctuations than Norway spruce.
We present quantitative reconstructions of regional vegetation cover in north-western Europe, wes... more We present quantitative reconstructions of regional vegetation cover in north-western Europe, western Europe north of the Alps, and eastern Europe for five time windows in the Holocene [around 6k, 3k, 0.5k, 0.2k, and 0.05k calendar years before present (bp)] at a 1° × 1° spatial scale with the objective of producing vegetation descriptions suitable for climate modelling. The REVEALS model was applied on 636 pollen records from lakes and bogs to reconstruct the past cover of 25 plant taxa grouped into 10 plant-functional types and three land-cover types [evergreen trees, summer-green (deciduous) trees, and open land]. The model corrects for some of the biases in pollen percentages by using pollen productivity estimates and fall speeds of pollen, and by applying simple but robust models of pollen dispersal and deposition. The emerging patterns of tree migration and deforestation between 6k bp and modern time in the REVEALS estimates agree with our general understanding of the vegetati...
ABSTRACT The ancient lake settlement tradition is not characteristic of one particular geographic... more ABSTRACT The ancient lake settlement tradition is not characteristic of one particular geographical area or time period, but it is spread over various European regions and dates from the Neolithic to the Middle Ages (Menotti and O’Sullivan 2013). Already in the 19th century, lake settlements were discovered in the Baltic region as well as elsewhere. Although research concentrated on sites in Poland up to the end of the 20th century (Pydyn and Gackowski 2011; Pranckėnaitė 2014, this volume), recent discoveries have directed attention to Lake Luokesa (Luokesai ežeras), Lithuania, as the five articles in the present issue show. The Luokesa lake settlements L1 and L2, dated to the transition from the Late Bronze Age to the Early Iron Age, were discovered at the very beginning of the 21st century and excavated between 2000 and 2011.The excavation (mainly of L1) was carried out underwater and revealed a thick cultural layer, containing extraordinarily well preserved organic material, which allowed an ...
ABSTRACT Pollen, non-pollen palynomorph, macrofossil, and lithological analyses of mid-Holocene d... more ABSTRACT Pollen, non-pollen palynomorph, macrofossil, and lithological analyses of mid-Holocene deposits from a small peat bog in northern Poland provide new proxy data on vegetation dynamics and climate between c. 9500 and 4600 cal. BP. The most prominent wetter climate phases occurred between c. 9500 and 9280±160 and between c. 5000 and 4600 cal. BP while a hot and dry period between 8185±145 and 5299±195 cal. BP corresponds with the Holocene Thermal Maximum (HTM). The HTM phase has been characterized by absolute dominance of Tilia cordata and the presence of T. platyphyllos beyond its current geographical range limit and a c. 2700 yr long, high incidence of the parasite fungus Kretzschmaria deusta in the local forest stand, concurrent with a dry phase on the mire. For the HTM, we suggest mean summer temperatures at least 3°C higher than today’s values. These data are in accordance with the geographic pattern of the HTM temperature anomalies in northern Europe, including the Baltic region, which suggest a gradient of positive anomalies from north to south and from west to east. The data also illustrate the effect of climate warming on the mid-Holocene pathogen outbreak and may indicate intensive vegetative reproduction as a Tilia strategy for population survival. Summer drought was probably important for high success of K. deusta in infecting weakened Tilia trees.
This study concerns the stand-scale palaeoe-cological reconstruction of the subsequent stages of ... more This study concerns the stand-scale palaeoe-cological reconstruction of the subsequent stages of late Holocene vegetation development on habitats recently covered by beech-dominated woodland in the southern Baltic region. The data, based on pollen, non-pollen paly-nomorphs, macrofossil and charcoal analyses from two close-lying sites, demonstrated that each of the subsequent late Holocene shifts in dominating forest communities took place because of human impact coupled with climatic events or episodic human-made disturbances. Shifts from the Tilia dominated forest to the Quercus-Corylus plant community at around 3300 BC was most probably driven by the coupled effect of climate change and human activity. Human impact was the primary driver of the final Corylus decline and concurrent major Carpinus expansion at c. 460 BC, and the Carpinus decline followed by Fagus expansion at c. AD 900. Carpinus had been lingering on the edge of a major expansion in the local forest for at least 2,500 years while Fagus had persisted in a small admixture for no fewer than 1,500 years before becoming important forest constituents. Our data illustrate the role of episodic disturbances as turning points that initiate long-term vegetation changes.
Pollen productivity estimates of individual plant taxa are necessary when determining changes of ... more Pollen productivity estimates of individual plant taxa are necessary when determining changes of vegetation cover during the Holocene. To date, studies describing this parameter in lowland temperate Europe have been carried out in cultural landscapes showing low forest cover and dominated by human activities. However, these may be of limited use when applied to reconstruct past land cover, for instance, from pre-agricultural landscapes. The aim of this paper is to ascertain whether pollen productivity from the closed-canopy old-growth forest in the Białowieża National Park, Poland, where human impact has been minimal for nearly a century, is different from that calculated in much more open landscapes. We ask: how much does forest antiquity and structure influence the amount of pollen released from particular taxa? We implemented maximum likelihood estimation of relative pollen productivity for seven tree species and for Poaceae using 18 modern pollen assemblages and distance-weighted plant abundances. Our results demonstrate that the ratio of pollen productivity between high producers (Pinus sylvestris and Quercus robur) and low producers (Poaceae, Corylus avellana) is on an average six times greater in Białowieża than across other European cultural landscapes. Pollen from forest Poaceae and C. avellana is six times more under-represented in old-growth forest than hitherto estimated from cultural landscapes. This finding reinforces the idea that pollen productivity can vary in response to changes in the prevailing environmental settings and we present for the first time a quantification of this variability, likely induced by differences in light availability.
ABSTRACT AimWe used combined palaeobotanical and genetic data to assess whether Norway spruce (Pi... more ABSTRACT AimWe used combined palaeobotanical and genetic data to assess whether Norway spruce (Picea abies) and Siberian spruce (Picea obovata), two major components of the Eurasian boreal forests, occupied separate glacial refugia, and to test previous hypotheses on their distinction, geographical delimitation and introgression.LocationThe range of Norway spruce in northern Europe and Siberian spruce in northern Asia.Methods Pollen data and recently compiled macrofossil records were summarized for the Last Glacial Maximum (LGM), late glacial and Holocene. Genetic variation was assessed in 50 populations using one maternally (mitochondrial nad1) and one paternally (chloroplast trnT–trnL) inherited marker and analysed using spatial analyses of molecular variance (SAMOVA).ResultsMacrofossils showed that spruce was present in both northern Europe and Siberia at the LGM. Congruent macrofossil and pollen data from the late glacial suggested widespread expansions of spruce in the East European Plain, West Siberian Plain, southern Siberian mountains and the Baikal region. Colonization was largely completed during the early Holocene, except in the formerly glaciated area of northern Europe. Both DNA markers distinguished two highly differentiated groups that correspond to Norway spruce and Siberian spruce and coincide spatially with separate LGM spruce occurrences. The division of the mtDNA variation was geographically well defined and occurred to the east of the Ural Mountains along the Ob River, whereas the cpDNA variation showed widespread admixture. Genetic diversity of both DNA markers was higher in western than in eastern populations.Main conclusionsNorth Eurasian Norway spruce and Siberian spruce are genetically distinct and occupied separate LGM refugia, Norway spruce on the East European Plain and Siberian spruce in southern Siberia, where they were already widespread during the late glacial. They came into contact in the basin of the Ob River and probably hybridized. The lower genetic diversity in the eastern populations may indicate that Siberian spruce suffered more from past climatic fluctuations than Norway spruce.
We present quantitative reconstructions of regional vegetation cover in north-western Europe, wes... more We present quantitative reconstructions of regional vegetation cover in north-western Europe, western Europe north of the Alps, and eastern Europe for five time windows in the Holocene [around 6k, 3k, 0.5k, 0.2k, and 0.05k calendar years before present (bp)] at a 1° × 1° spatial scale with the objective of producing vegetation descriptions suitable for climate modelling. The REVEALS model was applied on 636 pollen records from lakes and bogs to reconstruct the past cover of 25 plant taxa grouped into 10 plant-functional types and three land-cover types [evergreen trees, summer-green (deciduous) trees, and open land]. The model corrects for some of the biases in pollen percentages by using pollen productivity estimates and fall speeds of pollen, and by applying simple but robust models of pollen dispersal and deposition. The emerging patterns of tree migration and deforestation between 6k bp and modern time in the REVEALS estimates agree with our general understanding of the vegetati...
ABSTRACT The ancient lake settlement tradition is not characteristic of one particular geographic... more ABSTRACT The ancient lake settlement tradition is not characteristic of one particular geographical area or time period, but it is spread over various European regions and dates from the Neolithic to the Middle Ages (Menotti and O’Sullivan 2013). Already in the 19th century, lake settlements were discovered in the Baltic region as well as elsewhere. Although research concentrated on sites in Poland up to the end of the 20th century (Pydyn and Gackowski 2011; Pranckėnaitė 2014, this volume), recent discoveries have directed attention to Lake Luokesa (Luokesai ežeras), Lithuania, as the five articles in the present issue show. The Luokesa lake settlements L1 and L2, dated to the transition from the Late Bronze Age to the Early Iron Age, were discovered at the very beginning of the 21st century and excavated between 2000 and 2011.The excavation (mainly of L1) was carried out underwater and revealed a thick cultural layer, containing extraordinarily well preserved organic material, which allowed an ...
ABSTRACT Pollen, non-pollen palynomorph, macrofossil, and lithological analyses of mid-Holocene d... more ABSTRACT Pollen, non-pollen palynomorph, macrofossil, and lithological analyses of mid-Holocene deposits from a small peat bog in northern Poland provide new proxy data on vegetation dynamics and climate between c. 9500 and 4600 cal. BP. The most prominent wetter climate phases occurred between c. 9500 and 9280±160 and between c. 5000 and 4600 cal. BP while a hot and dry period between 8185±145 and 5299±195 cal. BP corresponds with the Holocene Thermal Maximum (HTM). The HTM phase has been characterized by absolute dominance of Tilia cordata and the presence of T. platyphyllos beyond its current geographical range limit and a c. 2700 yr long, high incidence of the parasite fungus Kretzschmaria deusta in the local forest stand, concurrent with a dry phase on the mire. For the HTM, we suggest mean summer temperatures at least 3°C higher than today’s values. These data are in accordance with the geographic pattern of the HTM temperature anomalies in northern Europe, including the Baltic region, which suggest a gradient of positive anomalies from north to south and from west to east. The data also illustrate the effect of climate warming on the mid-Holocene pathogen outbreak and may indicate intensive vegetative reproduction as a Tilia strategy for population survival. Summer drought was probably important for high success of K. deusta in infecting weakened Tilia trees.
Title: Białowieża Forest: what it used to be, what it is now and what we want it to be in the fut... more Title: Białowieża Forest: what it used to be, what it is now and what we want it to be in the future, Author(s): Szwagrzyk J., DOI: 10.1515/frp-2016-0030; Title: What is the use of studies carried out on the permanent plots in the Białowieża National Park?, Author(s): Bobiec A., DOI: 10.1515/frp-2016-0031; Title: The Białowieża Forest – a UNESCO Natural Heritage Site – protection priorities, Author(s): Kujawa A., Orczewska A., Falkowski M., Blicharska M., Bohdan A., Buchholz L., Chylarecki P., Gutowski J.M. , Latałowa M., Mysłajek R.W., Nowak S., Walankiewicz W., Zalewska A., DOI: 10.1515/frp-2016-0032; Title: Mass outbreaks of the spruce bark beetle Ips typographus in the context of the controversies around the Białowieża Primeval Forest, Author(s): Grodzki W., DOI: 10.1515/frp-2016-0033; Title: Ecology and biology of birds in the Białowieża Forest: a 40-year perspective, Author(s): Czeszczewik D., Walankiewicz W., DOI: 10.1515/frp-2016-0034; Title: Xylocopa valga Gerst. (Hymenoptera: Apidae) in Poland, Author(s): Huflejt T., Gutowski J.M., DOI: 10.1515/frp-2016-0035; Title: Managing bark beetle outbreaks (Ips typographus, Dendroctonus spp.) in conservation areas in the 21st century, Author(s): Kulakowski D., DOI: 10.1515/frp-2016-0036; Title: Why do foresters oppose the enlargement of the Białowieża National Park? The motivation of the State Forest Holding employees as perceived by social actors engaged in the conflict over the Białowieża Forest, Author(s): Niedziałkowski K., DOI: 10.1515/frp-2016-0037; Title: Changes in the stands of the Białowieża National Park from 2000 to 2015, Author(s): Miścicki S., DOI: 10.1515/frp-2016-0038; Title: Changes of water quality in the Łutownia and Perebel rivers in the Białowieża Primeval Forest, Author(s): Janek M., DOI: 10.1515/frp-2016-0039
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