High-ranking alleviates male local competition in lek mating systems

Giavazzi, Fabio; Saino, Nicola; Vailati, Alberto

doi:10.1038/s41598-018-33292-3

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…Low-ranking rhesus monkeys avoid attacks and threats from the dominant monkeys by “playing dumb” ( 4 ). The dominant individuals reproduce preferentially ( 5 ), which is essential for population development as well as the improvement of interspecific competitiveness ( 6 ).…”

Section: Introductionmentioning

confidence: 99%

Versatile, vigilance, and gut microbiome support the priority of high-ranking hens

Xie,

Xing,

Zhao

et al. 2023

Front. Vet. Sci.

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Dominance hierarchy exists in social animals and shows profound impacts on animals’ survival, physical and mental health, and reproductive success. Aggressive interaction, as the main indicator used to calculate social hierarchy, however, is not found in some female animals. In this study, we aimed to figure out the establishment of social hierarchy in hens that almost perform aggressive behaviors and investigated the interactions of social hierarchy with production performance and gut microbiome. Forty 49-day-old Qingyuan hens were randomly divided into four groups. The social hierarchy of hens was calculated by the relative position around the feeder. The rank 1 (R1), R2, R3, R4, R5, R6, R7, R8, R9, and R10 birds were determined in ascending order. Then, R1 and R2 birds (four duplicates, n = 8) were named as the high-ranking hens (HR) group, while R9 and R10 individuals were named as the low-ranking hens (LR) group (four duplicates, n = 8). The heart index (p = 0.01), number of visits per day, daily feed intake, and occupation time per day were higher in the HR group than LR group, but the LR group had a higher feed intake per visit than the HR group. The alpha diversity was significantly lower in the HR group than the LR group (p = 0.05). The relative abundance of phylum Firmicutes was higher while that of phylum Deferribacterota was lower in the HR group than LR group (p < 0.05). At the genus level, the relative abundance of Succinatimonas, Eubacterium hallii group, and Anaerostipes were higher in HR group than in LR group. The relative abundance of Bacteroides, Mucispirillum, Subdoligranulum, and Barnesiellaceae unclassified was higher in the LR group than HR group (p < 0.05). In conclusion, the rank of hens could be calculated by the relative position around the feeder when they compete for food. The dominant hens have a versatile. Moreover, they are more vigilant and have priority when foraging. Low-ranking hens adopt strategies to get enough food to sustain themselves. Hens of high-rank possess beneficial bacteria that use favorable substances to maintain the balance of the gut environment.

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Section: Introductionmentioning

confidence: 99%

Versatile, vigilance, and gut microbiome support the priority of high-ranking hens

Xie,

Xing,

Zhao

et al. 2023

Front. Vet. Sci.

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“…However empirical studies that test the adaptive pressures that promote the formation of clustered males are scarce, especially in courtship signalling and invertebrates (Greenfield, 1994). Thus, the puzzling question of why males would aggregate with their competitors in order to attract females has been re-opened (Toth et al 2015;DuVal et al 2018;Giavazzi et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Determining the extent and strength of female preferences for clustered signallers over a wide range of species, mating systems and communication channels is essential if we are to understand the repeated evolution of aggregated displays throughout the animal kingdom (Giavazzi et al 2018). Here we examine this question in a visually communicating crustacean (the fiddler crab).…”

Section: Introductionmentioning

confidence: 99%

Male spacing and female choice in a fiddler crab

Perez

Backwell

2019

Behavioral Ecology

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The aggregation of courting males is widespread among animal taxa, yet we do not understand why males congregate and therefore intensify local competition for female attention. The most commonly invoked theoretical explanation is that females preferentially approach clustered males due to the many benefits they would gain, and clustered males would therefore have higher mating success. However, although theoretical explanations of aggregation formation are well advanced, empirical studies are scarce, especially in invertebrates. In fact, there is little evidence that females do prefer to approach clustered displayers over spaced displayers. Here we address this question by using robotic crabs to test female preferences in fiddler crabs (a visually displaying species) and show that females do not preferentially approach clustered males. We suggest that if this pattern is more widespread, the most commonly invoked explanation of courting aggregations is of limited use. We offer explanations for the strong clustering behavior we observe in this species and discuss the implications of this finding for the theoretical underpinnings of this research field.

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High-ranking alleviates male local competition in lek mating systems

Cited by 2 publications

References 17 publications

Versatile, vigilance, and gut microbiome support the priority of high-ranking hens

Versatile, vigilance, and gut microbiome support the priority of high-ranking hens

Male spacing and female choice in a fiddler crab

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