Type-concept,higher classification and evolution

A study is made of the history of the type and related concepts, from Greek Antiquity up to the present. It is demonstrated that the type-concept of eighteenth century biology was based on Leibniz's concept of substantial form, and was not related to a Platonic Idea, whilst it is now generally understood in the sense of model or norm. In the present paper, a type-concept is developed which includes ontogenetic and phylogenetic time and various evolutionary mechanisms. This type (an archetype) can serve as a model of the evolutionary potentialities of a taxon, and as a standard of higher classification. All classifications based on the same archetype, whether typological, numerical or phylogenetic, will be comparable, although not necessarily identical.     

Is the biological classification of benthic diatom communities concordant with ecotypes?

In this study a biological classification based on diatom communities (a posteriori classification) was used to search for the most appropriate a priori classification in reference conditions, on the basis of 31 reference sites encompassing eight watersheds in the NE Iberian Peninsula. We considered three different a priori systems for comparison: (i) a typological classification (ecotypes and subecotypes) based on geomorphology and water flow; (ii) the watershed as a unit, irrespective of its size; and (iii) a classification based on the geographical distance between sites under the assumption that biological characteristics are increasingly similar in geographically closer sites. Classification in ecotypes and subecotypes was the most robust with minor differences between them. The watershed (hydrological units) classification was significant though weaker than the typological classification and there was a larger environmental variation within watersheds than within ecotypes. Finally, results showed that geographically closer sites were not more biologically similar in terms of diatom community composition. We can conclude that the ecotypological environmental-based classifications developed by the local water agency did adequately describe the biological classification based on epilithic diatoms.     

On the origin of the typological/population distinction in Ernst Mayr’s changing views of species, 1942–1959

Ernst Mayr’s typological/population distinction is a conceptual thread that runs throughout much of his work in systematics, evolutionary biology, and the history and philosophy of biology. Mayr himself claims that typological thinking originated in the philosophy of Plato and that population thinking was first introduced by Charles Darwin and field naturalists. A more proximate origin of the typological/population thinking, however, is found in Mayr’s own work on species. This paper traces the antecedents of the typological/population distinction by detailing Mayr’s changing views of species between 1942 and 1955. During this period, Mayr struggles to refine the biological species concept in the face of tensions that exist between studying species locally and studying them as geographically distributed collections of variable populations. The typological/population distinction is first formulated in 1955, when Mayr generalizes from the type concept versus the population concept in taxonomy to typological versus population thinking in biology more generally. Mayr’s appeal to the more general distinction between typological and population thinking coincides with the waning status of natural history and evolutionary biology that occurs in the early 1950s and the distinction plays an important role in Mayr’s efforts to legitimate the natural historical sciences.     

Population studies,Reproductive Behavior and family composition: Some theoretical considerations

Human populations are characterized by their heterogeneity, as much cultural as biological. This is why they can but the considered as complex entities. On the one side, this means going beyond the typological approach of traditional physical anthropology and thinking in terms of evolutionary processes, that is to say, population reproduction. On the other side, this implies developing an integrated view which takes into account as much cultural processes as demographic, socio-economic or biological ones. This paper aims to show, in this regard, the pertinence of taking the family as the unit of analysis. Yet, it is not enough to consider family structure, i.e. the composition of the domestic group, but one needs to understand the kinship system on which it is based and its dynamics. This is done by examining the different stages through which the family goes along its life cycle. We close these theoretical considerations by briefly illustrating them with our data on fertility and household composition in two different populations from the Altos de Chiapas in Mexico.     

Deconstructing morphology

Scholtz, G. 2010. Deconstructing morphology. —Acta Zoologica (Stockholm) 91 : 44–63 Morphology as the science of form is, in particular, related to the overwhelming diversity of animal forms. Due to its long pre‐Darwinian tradition, organismic morphology is partly burdened by ahistorical typological views. On the other hand, the study of organismic form has always implied concepts of transformation, which helped to pave the way for evolutionary theories. This contradictory history and the fact that we need words to describe organismic form lead in many cases to morphological concepts implying a mixture of structural, functional, developmental, ecological, typological, and evolutionary aspects in current morphological approaches. Because these mixed views lead to contradictory and misleading interpretations of animal form, I stress the need to deconstruct morphological concepts at all levels. I propose a morphology that analyses transformation of animal forms strictly at the structural level in combination with genealogical thinking. Function and other biological aspects of form should be considered in an independent second analytical step. A comparative pattern approach, including developmental patterns, of animal structure in an evolutionary framework allows for the analysis of morphological change, in particular, phylogenetic reconstructions, homology assessment, and the recognition of evolutionary independent morphological units.     

SPECIES CONCEPTS IN THE GENUSUSNEA(LICHENIZED ASCOMYCETES)

Practically most of the taxonomists working on vascular plants and fungi are using the so-called taxonomic species concept, relying largely on morphological criteria or other observable patterns of discontinuity and assuming that these patterns are reflecting the underlying genetic integrity of species. Such a concept is described in detail here for the genusUsnea. The typological view versus the populational view of species are discussed. The diagnostic value of characters used by previous and recent taxonomists of the genus is analysed. The fact thatUsneahas such a bad taxonomic reputation is discussed. The use by J. Motyka, author of the world monograph published in the thirties, of characters that are strongly modified by environmental factors together with a typological view of species are thought to be mainly responsible for this. More than 770 names have been published worldwide so far and it is suggested that around 50% are to be considered as synonyms.     

Displays of individually-typological features of animals and the person at a choice of strategy of goal-direction behavior

In work the hypothesis according to which different forms of goal-directed behavior develop depending on the basis of the undervaluation/supervaluation of reinforcement by brain abilities at the conditions of its achievement uncertainty. From these positions such opposite biological characteristics of the subject, as impulsiveness/self-control, care/propensity to risk on which basis there are individually typological features in behavior of the person and animals are considered. In the article, our experimental data on animals and the persons by behavioral techniques and results of last years on research of neural networks of animal cortical and subcortical brain structures depending on the strategy in choice behavior are also analyzed.     

Richard Owen, Morphology and Evolution

Richard Owen has been condemned by Darwinians as an anti-evolutionist and an essentialist. In recent years he has been the object of a revisionist analysis intended to uncover evolutionary elements in his scientific enterprise. In this paper I will examine Owen's evolutionary hypothesis and its connections with von Baer's idea of divergent development. To give appropriate importance to Owen's evolutionism is the first condition to develop an up-to-date understanding of his scientific enterprise, that is to disentagle Owen's contribution to the modernization of typology and morphology. I will argue that Owen's Platonic essentialism is rhetorical and incongruous. On the contrary, an interpretation of the archetype based on Aristotle's biological works makes possible a new conception of type, based on a homeostatic mechanism of stability. The renewal of morphology hinges on homological correspondences and a homeostatic process is also the origin of serial and special homology. I will argue that special homology shows an evolutionary orientation insofar as it is a typically inter-specific character while serial homology is determined through an elementary usage of the categories of developmental morphology. This revised version was published online in July 2006 with corrections to the Cover Date.     

Benthic insects and fish of the Doubs River system: typological traits and the development of a species continuum in a theoretically extrapolated watercourse

Using the distribution patterns of benthic insects (198 species) and fishes ( 29 species) from 11 tributaries and the main channel of the Doubs River drainage basin (French Jura), the authors have tried to establish whether there is an organization of species into discrete, identifiable communities. Principal Component Analysis (PCA) was used to identify whether a continuum existed, and also used to select 50 least-disturbed sites, which were used to define a theoretical watercourse. The density classes of each species were projected on this longitudinal gradient and each species response was characterised by two typological traits: its typological preferendum (tp) and its typological amplitude (ta),thus creating a synthesis of ecological characteristics. In the typological index given in the appendix, the 210 species which form a biological templet are listed in alphabetical order with their tp and ta values. These typological species traits are useful contributions to a database for running waters biomonitoring.     

Unburdening evo-devo: ancestral attractions, model organisms, and basal baloney

Although flourishing, I argue that evo-devo is not yet a mature scientific discipline. Its philosophical foundation exhibits an internal inconsistency that results from a metaphysical confusion. In modern evolutionary biology, species and other taxa are most commonly considered as individuals. I accept this thesis to be the best available foundation for modern evolutionary biology. However, evo-devo is characterized by a remarkable degree of typological thinking, which instead treats taxa as classes. This metaphysical incompatibility causes much distorted thinking. In this paper, I will discuss the logical implications of accepting the individuality thesis for evo-devo. First, I will illustrate the degree to which typological thinking pervades evo-devo. This ranges from the relatively innocent use of typologically tainted language to the more serious misuse of differences between taxa as evidence against homology and monophyly, and the logically flawed concept of partial homology. Second, I will illustrate how, in a context of typological thinking, evo-devo's harmless preoccupation with distant ancestors has become transformed into a pernicious problem afflicting the choice of model organisms. I will expose the logical flaws underlying the common assumption that model organisms can be expected to represent the clades they are a part of in an unambiguous way. I will expose the logical flaws underlying the general assumption that basal taxa are the best available stand-ins for ancestors and that they best represent the clade of which they are a part, while also allowing for optimal extrapolation of results.     

The former synthesis — Some remarks on the typological background of Haeckel’s ideas about evolution

Summary Haeckels concept of morphology was based on a comparative anatomy whose principles and essential characterizations came from a typological research tradition. Thus, in Haeckel’s works, the typological view and the Darwinian approach became intermingled. The aim of the present paper is not to add new details to the complicated history of morphology in Germany, but to provide a framework to sort out the methodological implications that resulted from that intermix of ideas.     

Uncloaking a Lost Cause: Decolonizing ancestry estimation in the United States

Since the professionalization of US-based forensic anthropology in the 1970s, ancestry estimation has been included as a standard part of the biological profile, because practitioners have assumed it necessary to achieve identifications in medicolegal contexts. Simultaneously, forensic anthropologists have not fully considered the racist context of the criminal justice system in the United States related to the treatment of Black, Indigenous, and People of Color; nor have we considered that ancestry estimation might actually hinder identification efforts because of entrenched racial biases. Despite ongoing criticisms from mainstream biological anthropology that ancestry estimation perpetuates race science, forensic anthropologists have continued the practice. Recent years have seen the prolific development of retooled typological approaches with 21st century statistical prowess to include methods for estimating ancestry from cranial morphoscopic traits, despite no evidence that these traits reflect microevolutionary processes or are suitable genetic proxies for population structure; and such approaches have failed to critically evaluate the societal consequences for perpetuating the biological race concept. Around the country, these methods are enculturated in every aspect of the discipline ranging from university classrooms, to the board-certification examination marking the culmination of training, to standard operating procedures adopted by forensic anthropology laboratories. Here, we use critical race theory to interrogate the approaches utilized to estimate ancestry to include a critique of the continued use of morphoscopic traits, and we assert that the practice of ancestry estimation contributes to white supremacy. Based on the lack of scientific support that these traits reflect evolutionary history, and the inability to disentangle skeletal-based ancestry estimates from supporting the biological validity of race, we urge all forensic anthropologists to abolish the practice of ancestry estimation.     

The shape and tempo of language evolution

There are approximately 7000 languages spoken in the world today. This diversity reflects the legacy of thousands of years of cultural evolution. How far back we can trace this history depends largely on the rate at which the different components of language evolve. Rates of lexical evolution are widely thought to impose an upper limit of 6000–10 000 years on reliably identifying language relationships. In contrast, it has been argued that certain structural elements of language are much more stable. Just as biologists use highly conserved genes to uncover the deepest branches in the tree of life, highly stable linguistic features hold the promise of identifying deep relationships between the world''s languages. Here, we present the first global network of languages based on this typological information. We evaluate the relative evolutionary rates of both typological and lexical features in the Austronesian and Indo-European language families. The first indications are that typological features evolve at similar rates to basic vocabulary but their evolution is substantially less tree-like. Our results suggest that, while rates of vocabulary change are correlated between the two language families, the rates of evolution of typological features and structural subtypes show no consistent relationship across families.     

A LOCAL FLORA AND THE BIOLOGICAL SPECIES CONCEPT

Up to the end of the 19th century the typological species concept was universally accepted, in which degree of morphological difference was the species criterion. This concept was increasingly replaced (particularly in zoology) beginning around 1900 by the biological species concept because the criterion of morphological distinctness broke down in the case of sibling species and of highly distinct intrapopulational variants. The yardstick for the recognition of biological species is the noninterbreeding of coexisting species in a local situation. This yardstick can be applied to isolated populations only by inference. It is discussed whether the making of such inferences is too arbitrary to be acceptable. A local flora is analyzed to determine whether polyploidy, apomixis, hybridization, and other deviations from regular sexual reproduction are sufficiently frequent in plants to make the biological species concept illusory. It is found that the number of difficulties is small, validating use of the sympatric situation as yardstick for the ranking of allopatric populations.     

Art mobilier magdalénien en matières dures animales de Moravie (République tchèque). Aspects technologique et stylistique

The Magdalenian techno-complex evolved in Western Europe and Central Europe between 17-12 kyr BP, concentrated in Spain on the Cantabrian Coast and in France in Pyrenees and Dordogne, in Central Europe in Poland and Moravia. In our study we analyse portable art on hard animal tissues from Moravian sites (Pekárna, K?í?ova, Rytí?ská), Czech Republic. Comparative material was provided by sites in South-western France (Laugerie, Basse, Enlène). The results of the technological, stylistic and typological comparisons confirm our hypothesis that the Magdalenian portable art from sites in Moravia belong to the Magdalenian techno-complex. The comparison of typological objects in Moravia, like decorated bone disc, pendants, Venus, bâton percé, spatule, shows that their variability is well in the range expected for techno-complex. The same technological pattern can be found between typological objects of spatule as a technology of decoupage but which is applied on different anatomical parts of animal raw material. We discussed the question about local origin of the objects. Technological comparison shows that engraving and bas-relief are more frequent in Moravia than in South-western France sites. This can be explained as a regional based preference of technology for expression of different subjects of mobile art, but also as a possible bias due to small sample size and differences in sampling of our studied objects. Engraving present similar technological characteristics that are featured in both areas. Design, like organization of space and size of the engraving, can be interpreted as an existence of contact between both groups and presence of one Magdalenian techno-complex.     

On Carl Gegenbaur’s theory on head metamerism and the selection of taxa for comparisons

Summary After the rejection of the idealistic “vertebral theory of the skull,” the basic idea of the theory had been taken up again by the German morphologist Carl Gegenbaur. He proposed a metameric ordering system of the vertebrate head based on a comparative investigation of selachians. This “segmentation theory of the vertebrate head” had a stimulating effect on comparative anatomy. Traces of the basic ideas are still inherent in the biological sciences. Despite the fact that Carl Gegenbaur proposed a rather phylogenetic approach, his systematic investigations remained on a typological level. It is argued herein, that the reason for that was his inability to perform his comparisons independent of a rather intuitive a priori hypothesis about phylogenetic relationships, thus leaving no possibilities for testing homologies. This is exemplified by Carl Gegenbaur’s choice of species for comparative work as well as his use of these species in comparative work. Choosing species for comparisons is discussed.     

Phylogeny,taxonomy, genetics and global heritage ranks of an imperilled,freshwater snail genus Lithasia (Pleuroceridae)

Numerous aquatic species are threatened with extinction from habitat elimination or modification. One particularly imperilled group is the freshwater gastropod family Pleuroceridae. Pleurocerids reach their greatest diversity in the southeastern United States, and many species are currently considered extinct, endangered or threatened. One issue hindering efforts to implement conservation management plans for imperilled pleurocerid species is that the taxonomy is in an abysmal state. The taxonomy of pleurocerids is currently based on late 19th- and early 20th-century studies, which used a typological or morphospecies concept. Most biologists today doubt the validity of many of the currently recognized species; however, this does not stop them from assigning conservation ranks in an attempt to determine which species are imperilled or currently stable. We conducted a phylogenetic analysis of the pleurocerid genus Lithasia using morphological and mitochondrial DNA sequence (mtDNA) data in an attempt to delimit species boundaries and test previous taxonomic schemes. We found that the current taxonomy of Lithasia does not reflect species diversity adequately within the genus, with two new undescribed species being discovered. The conservation status ranks of the new, undescribed species are imperilled and would have been overlooked had we relied on the conventional taxonomy. Additionally, the undescribed species' conservation ranks that were previously apparently secure became vulnerable due to being inappropriately assigned as members of formerly widely distributed species instead of the imperilled status they warrant and vice versa, as some taxa that were considered imperilled are now thought to be modestly stable. Our study suggests that conservation ranks should be considered suspect at best in taxonomically poorly known groups until the taxa are reviewed using modern systematic methods.     

Systemic analysis: Individual typological characteristics of the human body

Statistical analysis of the distribution of the mean somatometric, functional, and psychophysiological parameters in the total sample of subjects with the use of the χ² and λ tests and low, medium, and high habitual physical activity (HPA) levels (LHPA, MHPA, and HHPA, respectively) at different ontogenetic stages (junior and senior school students and young adults of both sexes) showed wide quantitative and qualitative ranges of psychophysiological individuality in a healthy population and demonstrated that it is reasonable to distinguish three typological groups or functional constitutional types (FT-1 corresponding to LHPA; FT-2, to MHPA; and FT-3, to HHPA). Typical first- and second-order parameters, as well as the results of third-order tests characterizing the current state, were determined for each FT. In order to comprehensively assess the constitutional type (synthetic constitution) of the subjects with low, medium, and high HPAs, the integrated analysis of the set of their characteristics was performed using the principles of polythetic (multi-variate) classification. The results obtained using multivariate statistical methods confirmed the basic postulate of the concept of typological variability of physiological individuality that a healthy human population is qualitatively heterogeneous in morphological, functional, and psychophysiological traits. The integrated physiological and statistical analyses of the results provided a scientific basis for three functional constitutional types (FT-1, FT-2, and FT-3) corresponding to three synthetic constitutional types (C 0-1, C 00, and C 01). These data indicate that the systemic (constitutional) approach to the estimation of individual typological characteristics confirm a high informativeness of partial constitution (FT-1, FT-2, and FT-3) in the human biological organization, and the set of characters selected for analysis allows the synthetic constitutional types to be adequately differentiated on a formal basis.