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12 November 2020 Variation in Mating Behaviors Between a Tropical and a Temperate Species of Medaka Fishes
Bayu K. A. Sumarto, Andy B. Nofrianto, Daniel F. Mokodongan, Sjamsu A. Lawelle, Kawilarang W. A. Masengi, Shingo Fujimoto, Kazunori Yamahira
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Abstract

In medaka fishes, the family Adrianichthyidae, tropical species are known to be sexually more dimorphic than temperate species. If this reflects that tropical species are exposed to stronger sexual-selection pressures than temperate species, mating behaviors may also differ between tropical and temperate species. Our mating experiments revealed that males of Oryzias woworae, a tropical species of the family, perform “chasing” another male more frequently than males of O. sakaizumii, a temperate congener, and that male–male “combats” of O. woworae tended to be followed by chasing compared with combats of O. sakaizumii males, indicating that O. woworae males are more aggressive in male–male interactions than O. sakaizumii males. Males of O. woworae also performed “approaching” a female and “mating dance” more frequently than O. sakaizumii males, indicating that O. woworae males are also more active in courting females. Males of O. sakaizumii often omitted “mating dance” in their mating sequences, supporting this view. Moreover, O. woworae females tended to reject male “wrapping”, an attempt for fertilization, more frequently than O. sakaizumii females, suggesting that O. woworae females are choosier in mating than O. sakaizumii females. These findings are concordant with the view that O. woworae is exposed to stronger sexual-selection pressures than O. sakaizumii.

© 20201 Zoological Society of Japan
Bayu K. A. Sumarto, Andy B. Nofrianto, Daniel F. Mokodongan, Sjamsu A. Lawelle, Kawilarang W. A. Masengi, Shingo Fujimoto, and Kazunori Yamahira "Variation in Mating Behaviors Between a Tropical and a Temperate Species of Medaka Fishes," Zoological Science 38(1), 45-50, (12 November 2020). https://doi.org/10.2108/zs200114
Received: 9 July 2020; Accepted: 27 August 2020; Published: 12 November 2020
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KEYWORDS
Fisherian runaway
mating experiment
Oryzias sakaizumii
Oryzias woworae
sexual selection
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