5 Works

Anisogamy is unrelated to the intensity of sexual selection

Judit Mokos, István Scheuring, András Liker, Robert P. Freckelton & Tamás Székely
Males and females often display different behaviours and, in the context of reproduction, these behaviours are labelled sex roles. The Darwin–Bateman paradigm argues that the root of these differences is anisogamy (i.e., differences in size and/or function of gametes between the sexes) that leads to biased sexual selection, and sex differences in parental care and body size. This evolutionary cascade, however, is contentious since some of the underpinning assumptions have been questioned. Here we investigate...

How mouthings interplay with sign morphology. Cross-modal strategies for inflectional marking in Hungarian Sign Language

Sziliárd Engelhardt
The paper focuses on the cross-modal expressions of inflectional marking found in Deaf bilingual Hungarian Sign Language users. To date there have been various findings on mouthings in sign languages. However, the impact of spoken morphology on mouthings gained far less attention and has never been studied systematically. The research on Hungarian Sign Language (Magyar Jelnyelv, MJNY) is devoted to expand our horizon in this regard. In doing so, it has been exploring unique cross-modal...

Social organization in ungulates: revisiting Jarman's hypotheses

Karola Szemán, András Liker & Tamás Székely
Ungulates (antelopes, deer and relatives) have some of the most diverse social systems among mammals. To understand the evolution of ungulate social organisation, Jarman (1974) proposed an ecological scenario of how distribution of resources, habitat and feeding style may have influenced social organisation. Although Jarman’s scenario makes intuitive sense and remain a textbook example of social evolution, it has not been scrutinised using modern phylogenetic comparative methods. Here we use 230 ungulate species from 10...

Evolution of large males is associated with female-skewed adult sex ratios in amniotes

András Liker, Veronika Bókony, Ivett Pipoly, Jean-François Lemaître, Jean-Michel Gaillard, Tamas Szekely & Robert P. Freckleton
Body size often differs between the sexes (leading to sexual size dimorphism, SSD), as a consequence of differential responses by males and females to selection pressures. Adult sex ratio (the proportion of males in the adult population, ASR) should influence SSD because ASR relates to both the number of competitors and available mates, which shape the intensity of mating competition and thereby promotes SSD evolution. However, whether ASR correlates with SSD variation among species has...

Sex roles in birds: influence of climate, life histories and social environment

Tamas Székely, András Liker, Gavin H. Thomas, Jan Komdeur, Oliver Krügger & Alejandro Gonzalez-Voyer
For detailed information concerning data collection please see Gonzalez-Voyer et al. Sex roles in birds: phylogenetic analyses of the influence of climate, life histories and social environment. Ecology Letters. Briefly, data on ecology, life histories and behaviour of birds were extracted from published literature. If several data were available for a given species, we included the ones that were extracted from breeding individuals or had larger sample sizes. The details regarding data processing are provided...

Registration Year

  • 2021

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  • Dataset
  • Text


  • University of Pannonia
  • University of Bath
  • University of Sheffield
  • University of Groningen
  • National Autonomous University of Mexico
  • Claude Bernard University Lyon 1
  • Bielefeld University
  • University of Debrecen
  • MTA Centre for Ecological Research