Evolution / Évolution Dispersal and fighting in male pollinating fig wasps Combats et dispersion chez les mâles de pollinisateurs de Ficus

For more than two decades, it has been the dogma that the males of pollinating fig wasps do not fight and that they only mate in their native fig. Their extreme degree of local mating leads to highly female biased sex ratios that should eliminate the benefits of fighting and dispersal by males. Furthermore, males sharing a fig are often brothers, and fighting may be barred by kin selection. Therefore, theory supported the presumed absence of fighting and dispersal in pollinating fig wasp males. However, we report here that in pollinating fig wasps, fighting between brothers evolved at least four and possibly six times, and dispersal by males at least twice. This finding supports the idea that competition between relatives can cancel the ameliorating effects of relatedness. The explanation to this evolutionary puzzle, as well as the consequences of male dispersal and fighting, opens the

[1]  J. Greeff.  Mating system and sex ratios of a pollinating fig wasp with dispersing males , 2002, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[2]  D. Bean,et al.  Male mating tactics and lethal combat in the nonpollinating fig wasp Sycoscapter australis , 2001, Animal Behaviour.

[3]  C. A. Machado,et al.  Phylogenetic relationships, historical biogeography and character evolution of fig-pollinating wasps , 2001, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[4]  G. Weiblen.  Phylogenetic relationships of fig wasps pollinating functionally dioecious Ficus based on mitochondrial DNA sequences and morphology. , 2001, Systematic biology.

[5]  A. Griffin,et al.  Testing Hamilton's rule with competition between relatives , 2001, Nature.

[6]  N. Perrin,et al.  Local Competition, Inbreeding, and the Evolution of Sex‐Biased Dispersal , 2000, The American Naturalist.

[7]  K. Ganeshaiah,et al.  What fig wasp sex ratios may or may not , 1999 .

[8]  J. Cook,et al.  Sex allocation and local mate competition in Old World non-pollinating fig wasps , 1999, Behavioral Ecology and Sociobiology.

[9]  J. Greeff,et al.  Mating ecology of the nonpollinating fig wasps ofFicus ingens , 1999, Animal Behaviour.

[10]  S. A. West,et al.  Partial local mate competition and the sex ratio: A study on non‐pollinating fig wasps , 1998 .

[11]  Ian C.W. Hardy,et al.  Patterns of sex ratio, virginity and developmental mortality in gregarious parasitoids☆ , 1998 .

[12]  S. Frank.  Foundations of Social Evolution , 2019 .

[13]  S. West,et al.  The Evolution of Mating Systems in Insects and Arachnids: Fig–associated wasps: pollinators and parasites, sex–ratio adjustment and male polymorphism, population structure and its consequences , 1997 .

[14]  S. L. Vincent.  Polymorphism and fighting in male fig wasps , 1992 .

[15]  J. Wiebes,et al.  African fig trees and fig wasps , 1992 .

[16]  M. Murray.  Comparative morphology and mate competition of flightless male fig wasps , 1990, Animal Behaviour.

[17]  H. Godfray.  Virginity in haplodiploid populations: a study on fig wasps , 1988 .

[18]  G. Michaloud.  Fighting in fig wasps. , 1988, Trends in ecology & evolution.

[19]  S. Frank.  Weapons and fighting in fig wasps , 1987 .

[20]  W. Hamilton.  WINGLESS AND FIGHTING MALES IN FIG WASPS AND OTHER INSECTS , 1979 .

[21]  Robert M. May,et al.  Dispersal in stable habitats , 1977, Nature.

[22]  M. Zeroni,et al.  CARBON DIOXIDE AND ETHYLENE EFFECTS IN THE CO‐ORDINATION BETWEEN THE POLLINATOR BLASTOPHAGA QUADRATICEPS AND THE SYCONIUM IN FICUS RELIGIOSA , 1973 .

[23]  D. Hartl.  Some Aspects of Natural Selection in Arrhenotokous Populations , 1971 .