In this study the relationship between functional morpholoy and evolutionary biology is analysed by confronting the main concepts in both disciplines.Rather than only discussing this connection theoretically, the analysis is carried out by introducing important practical and experimental studies, which use aspects from both disciplines. The mentioned investigations are methodologically analysed and the consequences for extensions of the relationship are worked out. It can be shown that both disciplines have a large domain of their own and also share a large (...) common ground. Many disagreements among evolutionary biologists can be reduced to differences in general philosophy (idealism vs. realism), selection of phenomenona (structure vs. function), definition of concepts (natural selection) and the position of the concept theory as an explaining factor (neutralists vs. selectionists, random variation, determinate selection, etc.). (shrink)

The meaning of optimality and economy in phylogenetics and evolutionary biology is discussed.It can be shown that the prevailing concepts of optimality and economy are equivocal as they are not based on strict theoretical positions and as they have a variable meaning in different theoretical contexts. The ideas of optimality and economy can be considered to be identical with the expectation of a relatively simple order in a particular field of study. Although there exists no way of inferring one or (...) several methods of solving scientific problems from the presupposed idea of economy and optimality, a lack of motivation for scientific investigations would result if the concepts of economy and optimality in nature were dropped. (shrink)

In biology, and particularly in morphology, various types of explanation are found,e.g. causal, teleological, historical, etc.In this article an attempt has been made to analyse the relations between the various explanations to strive for an encompassing explanatory theory.The general structure of the explanatory theories appeared to be very similar, but the terms defining the phenomena and the types of the relations within the theories differ. To obtain a unifying theory it is necessary to develop methods to connect or transform the (...) different elements.An important aspect is that the definition of selected phenomena depends on the explanation pursued. (shrink)

The importance of deviation-amplifying processes for the emergence of major evolutionary novelties is discussed by exemplifying the evolution of birds and the term ‘chain evolution’ is proposed.It is suggested that the importance of deviation-amplifying networks for the evolution of major systematic groups indicates that the changes leading to the origin of these groups progressed within a single genetic pool. The probability of polyphyletic origin of such taxonomic units as Tetrapoda, or Mammalia is regarded as extremely low.The diversity of the structure (...) of the central nervous system in different vertebrate groups is explained as resulting from multiple connections between it and the biology of the group. These connections form networks which may act either in a stabilizing or a deviation-amplifying way. Some examples of the networks are briefly discussed. (shrink)