![]() ![]() We therefore describe Nebela gimlii, a new species of the Nebela collaris group from the Le Cachot peatland in the Swiss Jura Mountains. collaris group, and allow sound ecological work and subsequent application in bioindication, it is essential to clarify the true diversity of testate amoebae using a combination of molecular and morphological approaches. In order to improve the taxonomic framework for the N. If such closely related forms are proved to differ in their ecological preferences and if they can be securely identified, then testate amoeba-based bioindication and palaeoecological tools could potentially be improved. Further evidence that genetically closely-related and morphologically similar forms may occupy different ecological niches and/or have contrasted geographic distributions was found in a broad scale study of the mixotrophic (morpho)species Hyalosphenia papilio (Heger et al., 2013). ![]() This suggested the existence of several taxa differing in their ecological optima and several distinct species were indeed described based on COI gene sequences and morphology (Kosakyan et al., 2013). collaris” along a wetness gradient indeed showed a multimodal distribution (Valiranta et al., 2012). This lumping may well have prevented ecologists from distinguishing forms that occupy different niches. Species discrimination has often been cited as problematic, and palaeoecologists have often lumped the different forms into a couple of species or varieties (Charman et al., 2000). They are found through the Northern Hemisphere, but also in South America (Zapata et al., 2008). They were found to occur in 72.6% of all samples in a review of European and North American data and are the most dominant taxa in communities (10.8% of the community on average) (Gilbert and Mitchell, 2006). European Journal of Protistology 51 (2015) 79–85Īmoebae in peatlands. ![]() tincta complex) are the second most common group of testateĭ. Members of the Nebela collaris species complex (or N. A thorough morphological analysis and the application of a single-cell barcoding approach (based on the COI gene) revealed the existence of several morphologically and genetically distinct taxa within the Nebela collaris complex (Kosakyan et al., 2013). However, their taxonomy is still far from being resolved in a satisfactory way, and recent studies have revealed a high diversity within individual morphospecies, sometimes referred to as cryptic or pseudocryptic (Kosakyan et al., 2012). All rights reserved.Ĭhanges (Charman, 2001 Mitchell et al., 2008). Their sensitivity to environmental changes and the good preservation of their shells in peat has led to their use as indicators of past environmentalĪuthor. Introduction Arcellinid testate amoebae are common and diverse in peatlands, where they constitute a large part (typically 10–30%) of microbial biomass (Gilbert, 1998 Gilbert et al., 1998 Mitchell et al., 2003). Keywords: Arcellinida Amoebozoa Cytochrome oxidase gene (COI) Peatland Protist Testate amoeba Improving the taxonomy of testate amoebae in peatlands and clarifying the ecology of newly discovered species should make these organisms even more valuable as bioindicators and for palaeoecological reconstruction. This new species completes the phylogeny of the Nebela collaris species complex, with now eight species described, mostly from peatlands and acidic forest litter, and further demonstrates the existence of an unknown diversity within testate amoebae. It is however genetically clearly distinct from these two species, and differs morphologically from them by its smaller size and stouter shape of the shell. collaris complex next to the morphologically similar N. The new species, called Nebela gimlii was placed in a phylogenetic tree based on mitochondrial cytochrome oxidase sequences (COI), and branched robustly within the N. Received 21 August 2014 received in revised form 4 November 2014 accepted 18 November 2014 Available online 24 November 2014Ībstract We describe here a new species of sphagnicolous testate amoeba found abundantly in the forested part of the Le Cachot peatland (Jura Mountains, Neuchâtel, Switzerland) based on microscopical observations (LM, SEM). Laboratory of Soil Biology, University of Neuchâtel, Rue Emile-Argand 11, Neuchâtel CH-2000, Switzerland Jardin Botanique de Neuchâtel, Chemin du Perthuis-du-Sault 58, CH-2000 Neuchâtel, Switzerland Available online at ScienceDirect European Journal of Protistology 51 (2015) 79–85Įight species in the Nebela collaris complex: Nebela gimlii (Arcellinida, Hyalospheniidae), a new species described from a Swiss raised bog David Singera,∗, Anush Kosakyana, Amandine Pillonela, Edward A.D. ![]()
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