Lauri Myllymaa

A long-standing problem in evolutionary theory is to clarify in what sense (if any) natural selection cumulatively improves the design of organisms. Various concepts, such as fitness and inclusive fitness, have been proposed to resolve this problem. In addition, there have been attempts to replace the original problem with more tractable questions such as whether a given gene or trait is favoured by selection. Here we ask what theoretical properties the concept fitness should possess to encapsulate the improvement criterion required to talk meaningfully about adaptive evolution. We argue that natural selection tends to shape phenotypes based on the causal properties of individuals, and that this tendency is therefore best captured by a fitness concept that focusses on these properties. We highlight a fitness concept which meets this role under broad conditions, but requires adjustments in our conceptual understanding of adaptive evolution. These adjustments combine elements of Dawkinsian gene selectionism and Egbert Leigh’s “parliament of genes”.

Kin selection on one hand, and gamete interactions in post-ejaculatory sexual selection on the other are two major research themes that have risen to prominence over the past half century and have simultaneously developed into central fields of research in evolutionary biology. There is a natural connection between the two: when gametes interact with each other, very commonly many of them originate from the same parent and are thus siblings. For example, sperm competition will almost always involve competition between sibling gametes even if the interacting parents are not related to each other. If parents are related to each other, the relatedness between gametes increases further. Here we discuss the relation between kin selection on one hand, and gamete competition, gamete limitation, local gamete competition, and the evolution of sex allocation on the other. To illustrate these topics, we present a novel model on sex allocation in simultaneous hermaphrodites under sperm limitation and limited, costly dispersal. We find that sperm limitation can significantly increase allocation into male function, but limited dispersal (and thus increased relatedness) does not alter sex allocation regardless of the presence of sperm limitation.

Henri Bergson (1859–1941) oli yksi 1900-luvun alkupuolen merkittävimpiä ranskalaisia filosofeja. Hän nousi kansainväliseen maineeseen pääteoksensa L’évolution créatrice (Luova evoluutio, 1907) myötä. Bergsonin filosofian kantavana ajatuksena on todellisen muutoksen luonteen ymmärtäminen. Bergsonin ajattelulle ominaista on erityistieteiden filosofinen analysointi ja tieteellisten tutkimustulosten tuominen osaksi filosofiaa. Vaikka Bergsonin omat filosofiset tavoitteet keskittyivät erityisesti tieteenteoreettisiin aiheisiin psykologiassa, biologiassa ja sosiologiassa sekä metafyysisiin kysymyksiin, hänen ajattelunsa vaikutus näkyy erityisesti myöhemmässä ranskalaisessa filosofiassa, fenomenologiassa ja eksistentialismissa. Urallaan Bergson osallistui aktiivisesti demokraattisen kansalaisyhteiskunnan toimintaan. Hänen uraansa värittivätkin erilaiset filosofiset, tieteelliset ja poliittiset kiistat.

It is important for the theory of knowledge to understand the factors involved in the generation of the capacities of knowledge. In the history of modern philosophy, knowledge is generally held to originate in either one or two sources, and the debates about these sources between philosophers have concerned their existence, or legitimacy. Furthermore, some philosophers have advocated scepticism about the human capacity to understand the origins of knowledge altogether. However, the developmental aspects of knowledge have received relatively little attention both by past philosophers and in current philosophical discussions. This dissertation provides a historical approach to this developmental problem of knowledge by interpreting the developmental theories of knowledge of Maine de Biran (1766–1824) and Henri Bergson (18591941) from the perspective of a theory of the ‘generative factors of knowledge.’ It first studies the philosophies of Maine de Biran and Bergson separately and then brings together and compares the metaphilosophical aims drawn from these philosophers. The dissertation’s novel analysis, provided by its theory and structure, has far-reaching consequences. From a wide point of view, it fills in considerable scholarly gaps and provides great opportunities for future research in the study of the history of philosophy. From more specific points of view, it provides its most decisive contributions in such metaphysical and epistemological topics as the nature of causality, self-generated activity, the role of effort in knowing and learning, the complementary relationship between philosophy and science, and the non-conceptual basis of knowledge.

Elämä on nähty merkittävänä aiheena Bergsonin filosofiassa. Elämän filosofinen merkitys Bergsonilla ilmenee selvästi hänen pääteoksessaan L'évolution créatrice (Luova evoluutio, 1907), jossa hän keskittyy inhimillisten tietokykyjen evolutiivisen alkuperän rekonstruointiin ja tieto-opillisiin seurauksiin. Bergsonin mukaan biologia tarjoaa filosofialle tietokykyjen kehitysteoreettisen näkökulman, ja filosofia metafysiikkana täsmentää biologialle sopivaa epistemologiaa. Tässä artikkelissa esittelen Bergsonin filosofisen teorian biologian ja epistemologian vastavuoroisesta suhteesta. Aloitan epistemologian, tieteen ja metafysiikan välisen suhteen selventämisellä Bergsonin teoriassa. Sen jälkeen esittelen, kuinka Bergson näkee tietokykyjen kehittymisen olennaisena osana eläinten yleistä kehityshistoriaa. Analysoimalla eläinkunnan kognitiivisten kykyjen kahta taipumusta, älykkyyttä (intelligence) ja vaistoa (instinct), Bergson kehittää näkemyksen metafysiikasta, jonka avulla on mahdollista selvittää epistemologian ja biologian keskinäistä riippuvuutta ja vastavuoroisuutta. Lopuksi valaisen tätä vastavuoroisuutta Bergsonin analyysilla käsitteellisen tiedon muodostumisesta.