Université de Neuchâtel

Diversity and biogeography of testate amoebae

Smith, Humphrey Graham ; Bobrov, Anatoly ; Lara, Enrique

In: Journal of Experimental Botany, 2008, vol. 17, no. 2, p. 329-343

Testate amoebae are amoeboid protists inhabiting a test (shell). They occur globally in soils, wetlands and freshwater, especially peats and mosses. They are of ancient origin, dating from at least the Mesozoic, with possible ancestors as old as the Neoproterozoic. Approximately 2,000 taxa have been described—a number which could easily rise to 4,000 with comprehensive recording. Whilst many...

Université de Neuchâtel

How many is enough? Determining optimal count totals for ecological and palaeoecological studies of testate amoebae

Payne, Richard J. ; Mitchell, Edward A. D.

In: Journal of Paleolimnology, 2009, vol. 42, no. 2, p. 483-495

Testate amoebae are increasingly used in ecological and palaeoecological studies of wetlands. To characterise the amoeba community a certain number of individuals need to be counted under the microscope. To date, most studies have aimed for 150 individuals, but that sample size is not based on adequate evidence. When testate amoeba concentrations are low, it can be difficult or impossible to...

Université de Neuchâtel

Potential implications of differential preservation of testate amoeba shells for paleoenvironmental reconstruction in peatlands

Mitchell, Edward A. D. ; Payne, Richard J. ; Lamentowicz, Mariucz

In: Journal of Paleolimnology, 2008, vol. 40, no. 2, p. 603-618

Testate amoebae are now commonly used in paleoenvironmental studies but little is known of their taphonomy. There is some experimental evidence for differential preservation of some testate amoeba shell types over others, but it is unclear what, if any impact this has on palaeoenvironmental reconstruction. To investigate this issue we looked at palaeoecological evidence for the preservation of...

Université de Neuchâtel

Last millennium palaeoenvironmental changes from a Baltic bog (Poland) inferred from stable isotopes, pollen, plant macrofossils and testate amoebae

Lamentowicz, Mariucz ; Cedro, A. ; Gałka, M. ; Goslar, T. ; Miotk-Szpiganowicz, G. ; Mitchell, Edward A. D. ; Pawlyta, J.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, 2008, vol. 165, no. 1-2, p. 93-106

The Baltic coast of Northern Poland is an interesting region for palaeoclimatic studies because of the mixed oceanic and continental climatic influences and the fact that the dominance of one or the other of these two influences might have changed over time. Also, unlike many more intensively studied regions of Europe, human impact in the region was rather limited until the 19th century. We...

Université de Neuchâtel

Testate amoebae analysis in ecological and paleoecological studies of wetlands: past, present and future

Mitchell, Edward A. D. ; Charman, Daniel J. ; Warner, Barry G.

In: Biodiversity and Conservation, 2008, vol. 17, no. 9, p. 2115-2137

Testate amoebae are an abundant and diverse polyphyletic group of shelled protozoa living in aquatic to moist habitats ranging from estuaries to lakes, rivers, wetlands, soils, litter, and moss habitats. Owing to the preservation of shells in sediments, testate amoebae are useful proxy indicators complementary to long-established indicators such as pollen and spores or macrofossils. Their primary...