scholarly journals Sexual selection in the barn swallow (Hirundo rustica). V. Geographic variation in ornament size

1995 ◽  
Vol 8 (1) ◽  
pp. 3-19 ◽  
Author(s):  
Anders Pape Moller
Keyword(s):  
Sexual Selection ◽  
Geographic Variation ◽  
Hirundo Rustica ◽  
Barn Swallow

scholarly journals Heterochiasmy and Sexual Dimorphism: The Case of the Barn Swallow (Hirundo rustica, Hirundinidae, Aves)

Genes ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1119
Author(s):  
Lyubov P. Malinovskaya ◽  
Katerina Tishakova ◽  
Elena P. Shnaider ◽  
Pavel M. Borodin ◽  
Anna A. Torgasheva
Keyword(s):  
Sexual Selection ◽  
Sexual Dimorphism ◽  
Empirical Data ◽  
Recombination Rate ◽  
Hirundo Rustica ◽  
Similar Species ◽  
Barn Swallow ◽  
Synaptonemal Complexes ◽  
Recombination Nodules ◽  
Barn Swallows

Heterochiasmy, a sex-based difference in recombination rate, has been detected in many species of animals and plants. Several hypotheses about evolutionary causes of heterochiasmy were proposed. However, there is a shortage of empirical data. In this paper, we compared recombination related traits in females and males of the barn swallow Hirundo rustica (Linnaeus, 1758), the species under strong sexual selection, with those in the pale martin Riparia diluta (Sharpe and Wyatt, 1893), a related and ecologically similar species with the same karyotype (2N = 78), but without obvious sexual dimorphism. Recombination traits were examined in pachytene chromosome spreads prepared from spermatocytes and oocytes. Synaptonemal complexes and mature recombination nodules were visualized with antibodies to SYCP3 and MLH1 proteins, correspondingly. Recombination rate was significantly higher (p = 0.0001) in barn swallow females (55.6 ± 6.3 recombination nodules per autosomal genome), caused by the higher number of nodules at the macrochromosomes, than in males (49.0 ± 4.5). They also showed more even distribution of recombination nodules along the macrochromosomes. At the same time, in the pale martin, sexual differences in recombination rate and distributions were rather small. We speculate that an elevated recombination rate in the female barn swallows might have evolved as a compensatory reaction to runaway sexual selection in males.

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