Clark W. Beasley (1942–2012)

Mcinnes, Sandra J. (2013): Clark W. Beasley (1942-2012). Zootaxa 3652 (4): 497-500, DOI: http://dx.doi.org/10.11646/zootaxa.3652.4.

The dynamic performance of identity work

As a phenomenon socially constructed and performed through relationships (Ainsworth and Hardy, 2004, Cunliffe, 2008, Beech, 2008), self-identity is inextricably dependent on interpersonal interactions and social contexts (Kondo, 1990, Kondrat, 1999, Ybema et al., 2009). Thus “selves and identities are ‘performed within relationships’, ‘done in interactions’ and/or ‘talked into being’” (Smith and Sparkes, 2008, p.25). As this suggests, identity is performative (Butler, 1990, Smith and Sparkes, 2008) and, therefore, identity work becomes an important feature of the way in which individuals strive to enact, and become, their identity (Kärreman and Alvesson, 2001, Down and Reveley, 2009

20 years of Zootaxa : Tardigrada (Ecdysozoa: Panarthropoda)

Over the last two decades, Zootaxa has hosted nearly 200 papers concerning tardigrade taxonomy, systematics, phylogeny, and evolution. A total of 160 researchers from all continents (except the Antarctic) published descriptions of almost 200 new taxa, mostly species, but also genera and higher taxonomic ranks, such as families and superfamilies. This editorial is dedicated to the late Professor Clark W. Beasley who was the first tardigrade Associate Editor for Zootaxa

Annotated zoogeography of non-marine Tardigrada : part IV : Africa

This paper is the fourth monograph in a series that describes the global records of limno-terrestrial water bears (Tardigrada). Here, we provide a comprehensive list of non-marine tardigrades recorded from Africa, providing an updated and revised taxonomy accompanied by geographic co-ordinates, habitat, and biogeographic comments. It is hoped this work will serve as a reference point and background for further zoogeographical and taxonomical studies

Assessing meiofaunal variation among individuals utilising morphological and molecular approaches: an example using the Tardigrada

<p>Abstract</p> <p>Background</p> <p>Meiofauna – multicellular animals captured between sieve size 45 μm and 1000 μm – are a fundamental component of terrestrial, and marine benthic ecosystems, forming an integral element of food webs, and playing a critical roll in nutrient recycling. Most phyla have meiofaunal representatives and studies of these taxa impact on a wide variety of sub-disciplines as well as having social and economic implications. However, studies of variation in meiofauna are presented with several important challenges. Isolating individuals from a sample substrate is a time consuming process, and identification requires increasingly scarce taxonomic expertise. Finding suitable morphological characters in many of these organisms is often difficult even for experts. Molecular markers are extremely useful for identifying variation in morphologically conserved organisms. However, for many species markers need to be developed <it>de novo</it>, while DNA can often only be extracted from pooled samples in order to obtain sufficient quantity and quality. Importantly, multiple independent markers are required to reconcile gene evolution with species evolution. In this primarily methodological paper we provide a proof of principle of a novel and effective protocol for the isolation of meiofauna from an environmental sample. We also go on to illustrate examples of the implications arising from subsequent screening for genetic variation at the level of the individual using ribosomal, mitochondrial and single copy nuclear markers.</p> <p>Results</p> <p>To isolate individual tardigrades from their habitat substrate we used a non-toxic density gradient media that did not interfere with downstream biochemical processes. Using a simple DNA release technique and nested polymerase chain reaction with universal primers we were able amplify multi-copy and, to some extent, single copy genes from individual tardigrades. Maximum likelihood trees from ribosomal 18S, mitochondrial <it>cytochrome oxidase subunit </it>1, and the single copy nuclear gene <it>Wingless </it>support a recent study indicating that the family Hypsibiidae is a non-monophyletic group. From these sequences we were able to detect variation between individuals at each locus that allowed us to identify the presence of cryptic taxa that would otherwise have been overlooked.</p> <p>Conclusion</p> <p>Molecular results obtained from individuals, rather than pooled samples, are a prerequisite to enable levels of variation to be placed into context. In this study we have provided a proof of principle of this approach for meiofaunal tardigrades, an important group of soil biota previously not considered amenable to such studies, thereby paving the way for more comprehensive phylogenetic studies using multiple nuclear markers, and population genetic studies.</p

Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data

The origin of the Antarctic continental extant fauna is a highly debated topic, complicated by the paucity of organisms for which we have clear biogeographic distributions and understanding of their evolutionary timescale. To shed new light on this topic, we coupled molecular clock analyses with biogeographic studies on the heterotardigrade genus Mopsechiniscus. This taxon includes species with endemic distributions in Antarctica and other regions of the southern hemisphere. Molecular dating using different models and calibration priors retrieved similar divergence time for the split between the Antarctic and South American Mopsechiniscus lineages (32\u201348 Mya) and the estimated age of the Drake Passage opening that led to the separation of Antarctica and South America. Our divergence estimates are congruent with other independent studies in dating Gondwanan geological events. Although different analyses retrieved similar results for the internal relationships within the Heterotardigrada, our results indicated that the molecular dating of tardigrades using genes coding for ribosomal RNA (18S and 28S rDNA) is a complex task, revealed by a very wide range of posterior density and a relative difficulty in discriminating between competing models. Overall, our study indicates that Mopsechiniscus is an ancient genus with a clear Gondwanan distribution, in which speciation was probably directed by a cooccurrence of vicariance and glacial events

Annotated zoogeography of non-marine Tardigrada. Part IV: Africa

This paper is the fourth monograph in a series that describes the global records of limno-terrestrial water bears (Tardigrada). Here, we provide a comprehensive list of non-marine tardigrades recorded from Africa, providing an updated and revised taxonomy accompanied by geographic co-ordinates, habitat, and biogeographic comments. It is hoped this work will serve as a reference point and background for further zoogeographical and taxonomical studie

Integrative description of a new Dactylobiotus (Eutardigrada: Parachela) from Antarctica that reveals an intraspecific variation in tardigrade egg morphology

Tardigrades constitute one of the most important group in the challenging Antarctic terrestrial ecosystem. Living in various habitats, tardigrades play major roles as consumers and decomposers in the trophic networks of Antarctic terrestrial and freshwater environments; yet we still know little about their biodiversity. The Eutardigrada is a species rich class, for which the eggshell morphology is one of the key morphological characters. Tardigrade egg morphology shows a diverse appearance, and it is known that, despite rare, intraspecific variation is caused by seasonality, epigenetics, and external environmental conditions. Here we report Dactylobiotus ovimutans sp. nov. from King George Island, Antarctica. Interestingly, we observed a range of eggshell morphologies from the new species, although the population was cultured under controlled laboratory condition. Thus, seasonality, environmental conditions, and food source are eliminated, leaving an epigenetic factor as a main cause for variability in this case

Exploring traditions of identity theory for Human Resource Development (HRD)

The question of who is developed by HRD might appear self-evident. However, the answer becomes less certain when one seeks to understand how the individual changes through HRD activities and how these changes in turn shape what they do and how others respond to them. Such concerns are of central interest to the study of identity, a field that sees the question of who someone ‘is’, and indeed is not, as an important contributor to the personal and interpersonal dynamics of organisational life. Many of those engaged in identity scholarship would readily declare themselves to understand identity as a socially constructed phenomenon. Beyond this, however, contrasting research traditions adopt different positions on what constitutes an identity, where it emanates from, and how it might be known. Such variety means identity offers a potentially fruitful series of frameworks for exploring the nature, as well as the effect, of HRD on the individual and the workplace. Unlocking this potential, however, requires a firm understanding of the perspectives from which identity is described and the processes through which it is sustained and evolves