Ecology of testate amoebae in peatlands of central china and development of a transfer function for paleohydrological reconstruction. This is the first largescale study using testate amoebae to develop transfer functions for water temperature in lakes and reservoirs. Request pdf temperature transfer functions based on freshwater testate amoebae from china globally, lakes and reservoirs ecosystems are integral parts of ecological processes. Reconstruction of recent sealevel change using testate amoebae.
Peatland paleohydrology in the southern west siberian. Although these unicellular protists are widely dispersed with globally similar hydrological preferences, regional variations in communities demand regionspeci. Testate amoebae as proxies for mean annual watertable depth in sphagnumdominated peatlands of north america robert k. Testate amoebae ecology and a local transfer function from a. May 26, 20 read ecology of testate amoebae in peatlands of central china and development of a transfer function for paleohydrological reconstruction, journal of paleolimnology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Ecology of testate amoebae from mires in the central rhodope. Testate amoebae formerly thecamoebians, testacea or thecamoeba are a polyphyletic group of unicellular amoeboid protists, which differ from naked amoebae in the presence of a test that partially encloses the cell, with an aperture from which the pseudopodia emerge, that provides the amoeba with shelter from predators and environmental conditions. Booth department of earth and environmental science, lehigh university, bethlehem, pennsylvania, usa. In doing so, we develop a new transfer function for peatland testate amoeba palaeohydrological reconstruction and shed new light on the biogeography and cosmopolitanism of testate amoebae and the potential effects of varying spatial scales and supraregional application on resulting transfer function. This study increases our understanding of relationships between testate amoebae and their habitat, which is valuable for palaeoenvironmental studies.
Testate amoebae as a proxy for reconstructing holocene water. A new european testate amoebae transfer function for palaeohydrological reconstruction on ombrotrophic peatlands. In chlebowo mire wielkopolska region, we investigated testate amoebae in relation to 10. These microorganisms have attracted the interest of paleoecologists because the preserved shells of testate amoebae and their known hydrological preferences enable reconstruction of past hydrological. In a preliminary effort towards development of a comprehensive north american calibration dataset, data from this study were combined with previous studies in michigan and the rocky mountains. Testate amoebae as proxies for mean annual watertable. University of groningen a new european testate amoebae. However, there is a limited understanding of the vertical distribution of encysted testate amoebae and the potential factors controlling this state, as encysted species have typically not been distinguished from live or dead. While transfer function training sets are typically of localto regionalscale in extent. Although the use of subfossil testate amoebae as a proxy for raised bog hydrology in holocene paleoecological studies is wellestablished, some detailed aspects of speciesenvironment relationships remain underresearched. The environmental preferences of testate amoebae species agree well with previous studies in other regions.
May 24, 2016 the tests shells of testate amoebae preserve well and are relatively abundant in organicrich detritus. Manual and users guide to canoco forwindows software. Swindles, school of geography, university of leeds, uk. Over the past couple of decades, transfer functions have been developed and validated in many regions. 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.
Development of a new paneuropean testate amoeba transfer function. Ecology of testate amoebae in peatlands of central china and development of a transfer function for paleohydrological reconstruction article pdf available in journal of paleolimnology 503. Your use of this pdf, the bioone complete website, and all posted and associated. The robustness of watertable results was assessed using comparisons of four separate transfer functions, a testate amoeba reconstruction from an additional site in southern west siberia, and an independent hydrological proxy of the. The use of testate amoebae in studies of peatland hydrology and palaeohydrology has been increasing, and considerable efforts have been made over the past decade to standardise techniques as much as possible. Ecology of testate amoebae in an amazonian peatland and. We present the first ecological analysis of testate amoebae in a tropical peatland, a nutrientpoor domed bog in western peruvian amazonia. Transfer functions are widely used in palaeoecology to infer past environmental conditions from fossil remains of many groups of organisms. Testate amoebae peatland water table transfer function ecology abstract fossil testate amoeba assemblages have been used to reconstruct peatland palaeohydrology for more than two decades.
In doing so, we develop a new transfer function for peatland testate amoeba palaeohydrological reconstruction and shed new light on the biogeography and cosmopolitanism of testate amoebae and the potential effects of varying spatial scales and supraregional application on resulting transfer function reconstructions. The performance of singleand multiproxy transfer functions. Ecology of testate amoebae from mires in the central. A new european testate amoebae transfer function for palaeohydrological reconstruction on ombrotrophic peatlands article pdf available in journal of quaternary science 22. Tolerance and optima statistics for each taxa were calculated through wa. Testate amoebae as water quality indicators in lakes. In contrast to traditional trainingset design with one observation per site, some trainingsets, including those for peatland testate amoebahydrology transfer functions, have a clustered structure with many observations from each site. A preliminary test of application of the transfer function to palaeo testate amoeba assemblages showed promising results. However, few regional calibration datasets exist in north america, and knowledge of testate amoeba ecology and distribution patterns are limited. Canoco reference manual and users guide to canoco for windows. The aims of this study are to determine the hydrological and ph preferences of testate amoebae in alaskan.
Temperature transfer functions based on freshwater testate. Produce transfer functions that can be used to reconstruct the most important 104 environmental drivers of testate amoeba distribution and. We investigated testate amoebae ecology in nine peatlands covering a 250km northsouth transect in southcentral alaska. In this article we briefly describe the common procedures used to collect, prepare and analyse testate amoebae. We developed and compared multiple transfer functions to infer peatland depth to the water table dwt and ph based on testate amoeba percentages, or presenceabsence, bryophyte. Reconstructions are based on transfer functions, relating modern assemblage composition to water table and moisture content, applied to fossil sequences. Transfer functions, partial least squares and weighted average regressions were made to show that testate amoebae can be used for reconstruction of water level with an accuracy of 0. Ecology of testate amoebae in peatlands of central. This study supports the use of testate amoebae in palaeoclimate studies and provides the first testate amoebae transfer function from alaska. Therefore ph can be inferred from the amoebae communities using weighted averaging regression and calibration. We present a testate amoebae training set for building a paleohydrology transfer function. They are useful for palaeoenvionmental reconstruction. Testate amoebae formerly thecamoebians, testacea or thecamoeba are a polyphyletic group of unicellular amoeboid protists, which differ from naked amoebae in the presence of a test that partially encloses the cell, with an aperture from which the pseudopodia emerge, that provides the amoeba with shelter from predators and environmental conditions the test of some species is produced. Development of a testate amoebaebased ph transfer function.
Towards a holarctic synthesis of peatland testate amoeba ecology. Objectives were to 1 identify environmental controls on testate amoebae, 2 develop transfer functions for paleoenvironmental inference, and 3 examine testate amoebae. Building a testate amoebaebased transfer function in. Testate amoebabased hydrological transfer functions have now been. Proxy climate data can be obtained from reconstructions of hydrological changes on ombrotrophic rainfed peatlands using biological indicators, such as testate amoebae. One such issue is the effect of bog surface microtopography on the climatic sensitivity of testate amoeba communities. We investigated the ecology and paleoecology of testate amoebae in peatlands of the colombian paramo to assess the use of testate amoebae as paleoenvironmental indicators. Reassessing the vertical distribution of testate amoeba. Ninetyone samples were collected from three sphagnum peatlands in the lesser khingan mountains, ne china. Detrended correspondence analysis and canonical correspondence analysis cca were. Testate amoebae ecology and a local transfer function from. Although the utility of testate amoebae as environmental indicators has been clearly demonstrated, improving the precision and accuracy of transfer functions should increase the applicability of testate amoebae in addressing a wider range of environmental issues. A testate amoebae transfer function was used to generate a quantitative watertable reconstruction.
Development of a new paneuropean testate amoeba transfer. In the decade since the first paneuropean testate amoebabased transfer function for peatland palaeohydrological reconstruction was. Ecology of testate amoebae in an amazonian peatland and development of a transfer function for palaeohydrological reconstruction. This study aims to 1 evaluate the relationship between testate amoebae and environmental variables. Therefore the study of testate amoebae ecology in southcentral alaska and the development of new transfer function models based on these data is a prerequisite to their use in paleoecological studies in this region and will also add to our wider knowledge of testate amoebae ecology and biogeography. Nov 01, 2011 read testate amoebae as estuarine water. An atlas of freshwater testate amoebae publication british. Redundancy analysis revealed that depth to the water table dwt and moisture content % water are the primary factors that control testate amoebae assemblages. Testing peatland testate amoeba transfer functions. They produce a decayresistant test, or shell, which can be identi. A typical testate amoeba is about 120th of a millimetre long and has one aperture, or hole, in its shell out of which it projects itself to move around and feed. The ecology of testate amoebae protista in southcentral.
Pdf ecology of testate amoebae in an amazonian peatland. Transfer functions for ph and substrate moisture were developed using jack. Read ecology of testate amoebae in peatlands of central china and development of a transfer function for paleohydrological reconstruction, journal of paleolimnology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. Testate amoebae as proxies for mean annual watertable depth. Testate amoebae also have the ability to encyst for long periods of time foissner 1987. Pdf testate amoebae ecology and local transfer function. Payne, rj, mitchell, ead 2007 ecology of testate amoebae from mires in the central rhodope mountains, greece and development of a transfer function for palaeohydrological reconstruction. Testate amoebae are unicellular microorganisms protists that are sensitive indicators of hydrological conditions and are found preserved in peat. Ecology and paleoenvironmental application of testate. Testate amoebae ecology and a local transfer function from a peatland in western poland. All transfer function models performed similarly and produced similar reconstructions on a fossil sequence. Here, a new regional testate amoebabased transfer function is presented for watertable depth from the northeastern. Testate amoebae are also sensitive to, and respond quickly to, environmental changes as the reproduction rate is as short as 34 days.
You are advised to consult the publishers version publishers pdf if you wish to cite from it. Modelling hydrological relationships of testate amoebae. Keywords thecamoebians testate amoebae lakes eutrophication phosphorus transfer function introduction thecamoebians testate amoebae, are a group of unicellular protozoans that occur in freshwater to brackish environments medioli and scott 1983. A shift in watertable depth occurred at the onset of the little ice age. All transfer function development should start with the null hypothesis that the model has no predictive power, but this is rarely, if ever, explicitly tested telford and birks, 2009. Statistical testing of a new testate amoebabased transfer. The methodology has been particularly developed through the use of transfer function models, which use testate amoebae species data to quantitatively infer. The ecology of testate amoebae protists in sphagnum north. There have been thousands of species of testate amoebae recorded globally, but we only find about 50 75 different species in a typical bog study. Here we examined testate amoebae community and 10 environmental variables from 51 lakes and reservoirs across china and developed testate amoebae transfer functions for temperature based on both.
Here we examined testate amoebae community and 10 environmental variables from 51 lakes and reservoirs across china and developed testate amoebae transfer functions for temperature based on both abundance and biomassdatasets. While transfer function training sets are typically of localto. A new european testate amoebae transfer function for palaeohydrological. Testate amoebae are common inhabitants of moist soils, wetland, and lacustrine habitats. Testate amoebae ecology and a local transfer function. Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands manuscript for palaeogeography, palaeoclimatology, palaeoecology 1 graeme t.
Testate amoebae as paleoindicators of surfacemoisture. Preparation and analysis of testate amoebae in peatland. Amesbury m j, mallon g, charman d j, hughes p d, booth r k, daley t j, garneau m 20 statistical testing of a new testate amoebae transfer function for watertable depth reconstruction on ombrotrophic peatlands in atlantic canada and far northeastern united states. Reconstructions are based on transfer functions, relating modern assemblage. Peatlands are widely exploited archives of paleoenvironmental change.
Testate amoebae as a proxy for reconstructing holocene. Testate amoebae ecology and a local transfer function from a peatland in. Testate amoebae have been used as environmental indicators in ecological and palaeoecological studies of peatlands, primarily in ombrotrophic sphagnumdominated peatlands in the mid and highlatitudes. Ecology of testate amoebae in peatlands of central china. Evaluating the use of testate amoeba for palaeohydrological. Testate amoebae are a polyphyletic collection of at least three taxonomic groups of unicellular eukaryotes kosakyan et al. A new european testate amoebae transfer function for. Ecology of testate amoebae protista in southcentral alaska.
Swindles, school of geography, university of leeds, uk, ls2 9jt corresponding author g. A new european testate amoebae transfer function on ombrotrophic peatlands. A new european testate amoebae transfer function on. Ecology and paleoenvironmental application of testate amoebae.
Comparisons with an existing transfer function for britain show that the european transfer function performs well in inferring measured water tables in britain but that the british data cannot be used to infer water tables for other european sites with confidence. Pdf a new european testate amoebae transfer function for. Existing transfer functions in europe and elsewhere. Transfer functions are widely used in palaeoecology to infer past environmental. Pdf the performance of singleand multiproxy transfer. Transfer functions derived from the study of the modern ecology of testate amoebae species allow reconstruction of changing mire surface wetness, which in ombrotrophic peatlands is. A total of 169 testate amoebae taxa were identified. Peatland testate amoebae are sensitive indicators of local hydrology and have been used as proxies for surface moisture conditions in fossil studies. A local transfer function was developed with the use of six models. Testate amoebae or testaceans, testacea, arcellaceans are unicellular eukaryotic. Bog microtopography and the climatic sensitivity of. Pdf ecology of testate amoebae in an amazonian peatland and.
Our goals are to 1 quantify the relationships between testate amoebae communities, environmental parameters ph, water table depth, soil moisture, conductivity, trace elements, and vegetation, 2 identify the key controls on testate amoebae distribution, and 3 develop a transfer function to be used in mountain fens of the region and. Transfer function models should enable water tables to be predicted within 2. The transfer function is applied to a short core from the stordalen mire. Testate amoebae have great potential for tracing changes in permafrost peatlands. Ecology of peatland testate amoebae in the alaskan. The first testate amoebae transfer function from abisko, sweden is presented. A series of transfer functions based on surface samples of testate amoebae were.
1229 1092 509 983 1495 47 1675 917 395 1235 288 1354 305 1261 834 117 262 92 1440 206 1062 1585 72 73 377 767 910 776 280 1209 735 214 686 507 1076 1099 312 741 1440 537 1174 530 1317 979