Curtis, CJ and Juggins, S and Battarbee, RW and Catalan, J and Clarke, G and Kernan, M and Posch,... more Curtis, CJ and Juggins, S and Battarbee, RW and Catalan, J and Clarke, G and Kernan, M and Posch, M and Thompson, R (2009) Regional separation of climate change and acid deposition as drivers of diatom assemblage change in European mountain lakes using transfer functions. Freshwater Biology , 54 2555 - 2572. ... Full text not available from this repository. ... Regional separation of climate change and acid deposition as drivers of diatom assemblage change in European mountain lakes using transfer functions.
... This required the inverse of the approach taken with the general image databases, ie taxonomi... more ... This required the inverse of the approach taken with the general image databases, ie taxonomic depth rather than breadth. ... Chapter 4-Ima9in9 techniques and databases 69 Autber iaaex teble '* Ailhomlf ttnr% Commtieeno Perteai Tabie Suram* Irutuls NNHM Wott higher Uxon . ...
Cajo J . F . ter Braak'°2 & Steve Juggins3,4 'Agricultural Mathematics Group-DLO, B... more Cajo J . F . ter Braak'°2 & Steve Juggins3,4 'Agricultural Mathematics Group-DLO, Box 100, 6700 AC Wageningen, The Netherlands, 2DLO-Institute for Forestry and Nature Research, Box 23, 6700 AA Wageningen, The Netherlands ; 3Environmental Change Research Centre, ...
Series in Machine Perception and Artificial Intelligence, 2002
... This required the inverse of the approach taken with the general image databases, ie taxonomi... more ... This required the inverse of the approach taken with the general image databases, ie taxonomic depth rather than breadth. ... Chapter 4-Ima9in9 techniques and databases 69 Autber iaaex teble '* Ailhomlf ttnr% Commtieeno Perteai Tabie Suram* Irutuls NNHM Wott higher Uxon . ...
Freshwater sensitivity to acidification varies according to geology, soils and land-use, and cons... more Freshwater sensitivity to acidification varies according to geology, soils and land-use, and consequently it remains difficult to quantify the current extent of acidification, or its biological impacts, based on limited spot samples. The problem is particularly acute for river systems, where the transition from acid to circum-neutral conditions can occur within short distances. This paper links an established point-based long-term acidification model (MAGIC) with a landscape-based mixing model (PEARLS) to simulate spatial and temporal variations in acidification for a 256 km(2) catchment in North Wales. Empirical relationships are used to predict changes in the probability of occurrence of an indicator invertebrate species, Baetis rhodani, across the catchment as a function of changing chemical status. Results suggest that, at present, 27% of the river network has a mean acid neutralising capacity (ANC) below a biologically-relevant threshold of 20 microeq l(-1). At high flows, this proportion increases to 45%. The model suggests that only around 16% of the stream network had a mean ANC < 20 microeq l(-1) in 1850, but that this increased to 42% at the sulphur deposition peak around 1970. By 2050 recovery is predicted, but with some persistence of acid conditions in the most sensitive, peaty headwaters. Stream chemical suitability for Baetis rhodani is also expected to increase in formerly acidified areas, but for overall abundance to remain below that simulated in 1850. The approach of linking plot-scale process-based models to catchment mixing models provides a potential means of predicting the past and future spatial extent of acidification within large, heterogeneous river networks and regions. Further development of ecological response models to include other chemical predictor variables and the effects of acid episodes would allow more realistic simulation of the temporal and spatial dynamics of ecosystem recovery from acidification.
To date, little is known about the relative importance of dispersal related versus local factors ... more To date, little is known about the relative importance of dispersal related versus local factors in shaping microbial metacommunities. A common criticism regarding existing datasets is that the level of taxonomic resolution might be too coarse to reliably assess microbial ...
In this study, two distinct sets of analyses are conducted on a freshwater acidification critical... more In this study, two distinct sets of analyses are conducted on a freshwater acidification critical load dataset, with the objective of assessing the quality of various models in estimating critical load exceedance data. Relationships between contextual catchment and critical load data are known to vary across space; as such, we cater for this in our model choice. Firstly, ordinary kriging
"Summary 1. Priority question exercises are becoming an increasingly common tool... more "Summary 1. Priority question exercises are becoming an increasingly common tool to frame future agendas in conservation and ecological science. They are an effective way to identify research foci that advance the field and that also have high policy and conservation relevance. 2. To date, there has been no coherent synthesis of key questions and priority research areas for pal- aeoecology, which combines biological, geochemical and molecular techniques in order to recon- struct past ecological and environmental systems on time-scales from decades to millions of years. 3. We adapted a well-established methodology to identify 50 priority research questions in palaeoe- cology. Using a set of criteria designed to identify realistic and achievable research goals, we selected questions from a pool submitted by the international palaeoecology research community and relevant policy practitioners. 4. The integration of online participation, both before and during the workshop, increased interna- tional engagement in question selection. 5. The questions selected are structured around six themes: human–environment interactions in the Anthropocene; biodiversity, conservation and novel ecosystems; biodiversity over long time-scales; ecosystem processes and biogeochemical cycling; comparing, combining and synthesizing informa- tion from multiple records; and new developments in palaeoecology. 6. Future opportunities in palaeoecology are related to improved incorporation of uncertainty into reconstructions, an enhanced understanding of ecological and evolutionary dynamics and processes and the continued application of long-term data for better-informed landscape management."
Curtis, CJ and Juggins, S and Battarbee, RW and Catalan, J and Clarke, G and Kernan, M and Posch,... more Curtis, CJ and Juggins, S and Battarbee, RW and Catalan, J and Clarke, G and Kernan, M and Posch, M and Thompson, R (2009) Regional separation of climate change and acid deposition as drivers of diatom assemblage change in European mountain lakes using transfer functions. Freshwater Biology , 54 2555 - 2572. ... Full text not available from this repository. ... Regional separation of climate change and acid deposition as drivers of diatom assemblage change in European mountain lakes using transfer functions.
... This required the inverse of the approach taken with the general image databases, ie taxonomi... more ... This required the inverse of the approach taken with the general image databases, ie taxonomic depth rather than breadth. ... Chapter 4-Ima9in9 techniques and databases 69 Autber iaaex teble '* Ailhomlf ttnr% Commtieeno Perteai Tabie Suram* Irutuls NNHM Wott higher Uxon . ...
Cajo J . F . ter Braak'°2 & Steve Juggins3,4 'Agricultural Mathematics Group-DLO, B... more Cajo J . F . ter Braak'°2 & Steve Juggins3,4 'Agricultural Mathematics Group-DLO, Box 100, 6700 AC Wageningen, The Netherlands, 2DLO-Institute for Forestry and Nature Research, Box 23, 6700 AA Wageningen, The Netherlands ; 3Environmental Change Research Centre, ...
Series in Machine Perception and Artificial Intelligence, 2002
... This required the inverse of the approach taken with the general image databases, ie taxonomi... more ... This required the inverse of the approach taken with the general image databases, ie taxonomic depth rather than breadth. ... Chapter 4-Ima9in9 techniques and databases 69 Autber iaaex teble '* Ailhomlf ttnr% Commtieeno Perteai Tabie Suram* Irutuls NNHM Wott higher Uxon . ...
Freshwater sensitivity to acidification varies according to geology, soils and land-use, and cons... more Freshwater sensitivity to acidification varies according to geology, soils and land-use, and consequently it remains difficult to quantify the current extent of acidification, or its biological impacts, based on limited spot samples. The problem is particularly acute for river systems, where the transition from acid to circum-neutral conditions can occur within short distances. This paper links an established point-based long-term acidification model (MAGIC) with a landscape-based mixing model (PEARLS) to simulate spatial and temporal variations in acidification for a 256 km(2) catchment in North Wales. Empirical relationships are used to predict changes in the probability of occurrence of an indicator invertebrate species, Baetis rhodani, across the catchment as a function of changing chemical status. Results suggest that, at present, 27% of the river network has a mean acid neutralising capacity (ANC) below a biologically-relevant threshold of 20 microeq l(-1). At high flows, this proportion increases to 45%. The model suggests that only around 16% of the stream network had a mean ANC < 20 microeq l(-1) in 1850, but that this increased to 42% at the sulphur deposition peak around 1970. By 2050 recovery is predicted, but with some persistence of acid conditions in the most sensitive, peaty headwaters. Stream chemical suitability for Baetis rhodani is also expected to increase in formerly acidified areas, but for overall abundance to remain below that simulated in 1850. The approach of linking plot-scale process-based models to catchment mixing models provides a potential means of predicting the past and future spatial extent of acidification within large, heterogeneous river networks and regions. Further development of ecological response models to include other chemical predictor variables and the effects of acid episodes would allow more realistic simulation of the temporal and spatial dynamics of ecosystem recovery from acidification.
To date, little is known about the relative importance of dispersal related versus local factors ... more To date, little is known about the relative importance of dispersal related versus local factors in shaping microbial metacommunities. A common criticism regarding existing datasets is that the level of taxonomic resolution might be too coarse to reliably assess microbial ...
In this study, two distinct sets of analyses are conducted on a freshwater acidification critical... more In this study, two distinct sets of analyses are conducted on a freshwater acidification critical load dataset, with the objective of assessing the quality of various models in estimating critical load exceedance data. Relationships between contextual catchment and critical load data are known to vary across space; as such, we cater for this in our model choice. Firstly, ordinary kriging
"Summary 1. Priority question exercises are becoming an increasingly common tool... more "Summary 1. Priority question exercises are becoming an increasingly common tool to frame future agendas in conservation and ecological science. They are an effective way to identify research foci that advance the field and that also have high policy and conservation relevance. 2. To date, there has been no coherent synthesis of key questions and priority research areas for pal- aeoecology, which combines biological, geochemical and molecular techniques in order to recon- struct past ecological and environmental systems on time-scales from decades to millions of years. 3. We adapted a well-established methodology to identify 50 priority research questions in palaeoe- cology. Using a set of criteria designed to identify realistic and achievable research goals, we selected questions from a pool submitted by the international palaeoecology research community and relevant policy practitioners. 4. The integration of online participation, both before and during the workshop, increased interna- tional engagement in question selection. 5. The questions selected are structured around six themes: human–environment interactions in the Anthropocene; biodiversity, conservation and novel ecosystems; biodiversity over long time-scales; ecosystem processes and biogeochemical cycling; comparing, combining and synthesizing informa- tion from multiple records; and new developments in palaeoecology. 6. Future opportunities in palaeoecology are related to improved incorporation of uncertainty into reconstructions, an enhanced understanding of ecological and evolutionary dynamics and processes and the continued application of long-term data for better-informed landscape management."
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