RT Journal Article T1 The Complex Nexus of Evolutionary Fitness T2 El complejo nexo de la aptitud evolutiva A1 Suárez, Mauricio AB The propensity nature of evolutionary fitness has long been appreciated and is nowadays amply discussed (Abrams, 2009, 2012; Ariew & Ernst, 2009; Ariew & Lewontin, 2004; Beatty & Finsen, 1989; Brandon, 1978; Drouet & Merlin, 2015; Mills & Beatty, 1979; Millstein, 2003, 2016; Pence & Ramsey, 2013; Sober, 1984, 2001, 2013, 2019; Walsh, 2010; Walsh et al., 2016; etc). The discussion has, however, on occasion followed long standing confations in the philosophy of probability literature between propensities, probabilities, and frequencies. In this paper, I apply a more recent conception of propensities in modelling practice (the ‘complex nexus of chance’, CNC) to some of the key issues, regarding the mathematical representation of ftness and how it may be regarded as explanatory. The ensuing complex nexus of ftness (CNF) emphasises the distinction between biological propensities and the probability distributions over ofspring numbers that they give rise to; and how critical it is to distinguish the possession conditions of the underlying dispositional (physical and biological) properties from those of their probabilistic manifestations. PB Springer Nature SN 1879-4912 YR 2022 FD 2022-01-26 LK https://hdl.handle.net/20.500.14352/71327 UL https://hdl.handle.net/20.500.14352/71327 LA eng NO Suárez, Mauricio. «The Complex Nexus of Evolutionary Fitness». European Journal for Philosophy of Science, vol. 12, n.o 1, marzo de 2022, p. 9. DOI: https://doi.org/10.1007/s13194-021-00434-w. NO CRUE-CSIC (Acuerdos Transformativos 2021) NO Ministerio de Ciencia, Innovación y Universidades (España) NO Agencia Estatal de Investigación DS Docta Complutense RD 16 abr 2025