Raw data for the Caswell testate amoebae surface sample dataset obtained from the Neotoma Paleoec... more Raw data for the Caswell testate amoebae surface sample dataset obtained from the Neotoma Paleoecological Database.
Raw data for the Kachemak testate amoebae surface sample dataset obtained from the Neotoma Paleoe... more Raw data for the Kachemak testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Houston testate amoebae surface sample dataset obtained from the Neotoma Paleoec... more Raw data for the Houston testate amoebae surface sample dataset obtained from the Neotoma Paleoecological Database.
Raw data for the Moose Pass testate amoebae surface sample dataset obtained from the Neotoma Pale... more Raw data for the Moose Pass testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Clam Gulch testate amoebae surface sample dataset obtained from the Neotoma Pale... more Raw data for the Clam Gulch testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Jigsaw Lake testate amoebae surface sample dataset obtained from the Neotoma Pal... more Raw data for the Jigsaw Lake testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Sterling testate amoebae surface sample dataset obtained from the Neotoma Paleoe... more Raw data for the Sterling testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Bicentennial Park testate amoebae surface sample dataset obtained from the Neoto... more Raw data for the Bicentennial Park testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Testate amoebae are valuable indicators of peatland hydrology and have been used in many palaeocl... more Testate amoebae are valuable indicators of peatland hydrology and have been used in many palaeoclimatic studies in peatlands. Because the species' ecological optima may vary around the globe, the development of transfer function models is an essential prerequisite for regional palaeoclimatic studies using testate amoebae. We investigated testate amoebae ecology in nine peatlands covering a 250-km north-south transect in south-central Alaska. Redundancy analysis and Mantel tests were used to establish the relationship between the measured environmental variables (water-table depth and pH) and testate amoebae communities. Transfer-function models were developed using weighted averaging, weighted average partial least squares and maximum likelihood techniques. Model prediction error was initially 15.8 cm for water-table depth and 0.3 for pH but this was reduced to 9.7 cm and 0.2 by selective data exclusion. The relatively poor model performance compared with previous studies may be...
Readers of this journal need to know what sort of book this is, for it is written by a historian ... more Readers of this journal need to know what sort of book this is, for it is written by a historian of culture and not an environmental scientist. They need also to be reminded that a new subfi eld of humanistic study called environmental history is emerging and that it is one which will ...
The palaeoclimatic record for the past 6000 years, implemented from peat-bog stratigraphy, has be... more The palaeoclimatic record for the past 6000 years, implemented from peat-bog stratigraphy, has been limited by imprecision in dating and climatic interpretation. Recently, dating problems have been addressed by 'wiggle-matched' radiocarbon dates and by volcanic ash layers, promising much tighter correlation between records from different regions. Recent research shows key dates of significant climatic change and tentative evidence for periodicity. Application of time-series analysis, generalized linear modelling and transfer function models to the proxy climate data show how improved climatic reconstructions can be obtained. Peat-derived palaeoclimatic data might explain, as well as describe, climatic changes over timescales of 102-103 years.
Raw data for the Caswell testate amoebae surface sample dataset obtained from the Neotoma Paleoec... more Raw data for the Caswell testate amoebae surface sample dataset obtained from the Neotoma Paleoecological Database.
Raw data for the Kachemak testate amoebae surface sample dataset obtained from the Neotoma Paleoe... more Raw data for the Kachemak testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Houston testate amoebae surface sample dataset obtained from the Neotoma Paleoec... more Raw data for the Houston testate amoebae surface sample dataset obtained from the Neotoma Paleoecological Database.
Raw data for the Moose Pass testate amoebae surface sample dataset obtained from the Neotoma Pale... more Raw data for the Moose Pass testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Clam Gulch testate amoebae surface sample dataset obtained from the Neotoma Pale... more Raw data for the Clam Gulch testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Jigsaw Lake testate amoebae surface sample dataset obtained from the Neotoma Pal... more Raw data for the Jigsaw Lake testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Sterling testate amoebae surface sample dataset obtained from the Neotoma Paleoe... more Raw data for the Sterling testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Raw data for the Bicentennial Park testate amoebae surface sample dataset obtained from the Neoto... more Raw data for the Bicentennial Park testate amoebae surface sample dataset obtained from the Neotoma Paleoecology Database.
Testate amoebae are valuable indicators of peatland hydrology and have been used in many palaeocl... more Testate amoebae are valuable indicators of peatland hydrology and have been used in many palaeoclimatic studies in peatlands. Because the species' ecological optima may vary around the globe, the development of transfer function models is an essential prerequisite for regional palaeoclimatic studies using testate amoebae. We investigated testate amoebae ecology in nine peatlands covering a 250-km north-south transect in south-central Alaska. Redundancy analysis and Mantel tests were used to establish the relationship between the measured environmental variables (water-table depth and pH) and testate amoebae communities. Transfer-function models were developed using weighted averaging, weighted average partial least squares and maximum likelihood techniques. Model prediction error was initially 15.8 cm for water-table depth and 0.3 for pH but this was reduced to 9.7 cm and 0.2 by selective data exclusion. The relatively poor model performance compared with previous studies may be...
Readers of this journal need to know what sort of book this is, for it is written by a historian ... more Readers of this journal need to know what sort of book this is, for it is written by a historian of culture and not an environmental scientist. They need also to be reminded that a new subfi eld of humanistic study called environmental history is emerging and that it is one which will ...
The palaeoclimatic record for the past 6000 years, implemented from peat-bog stratigraphy, has be... more The palaeoclimatic record for the past 6000 years, implemented from peat-bog stratigraphy, has been limited by imprecision in dating and climatic interpretation. Recently, dating problems have been addressed by 'wiggle-matched' radiocarbon dates and by volcanic ash layers, promising much tighter correlation between records from different regions. Recent research shows key dates of significant climatic change and tentative evidence for periodicity. Application of time-series analysis, generalized linear modelling and transfer function models to the proxy climate data show how improved climatic reconstructions can be obtained. Peat-derived palaeoclimatic data might explain, as well as describe, climatic changes over timescales of 102-103 years.
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