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Multimodal communication in courting fiddler crabs reveals male performance capacities

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ABSTRACT

Courting males often perform different behavioural displays that demonstrate aspects of their quality. Male fiddler crabs, Uca sp., are well known for their repetitive claw-waving display during courtship. However, in some species, males produce an additional signal by rapidly stridulating their claw, creating a ‘drumming’ vibrational signal through the substrate as a female approaches, and even continue to drum once inside their burrow. Here, we show that the switch from waving to drumming might provide additional information to the female about the quality of a male, and the properties of his burrow (multiple message hypothesis). Across males there was, however, a strong positive relationship between aspects of their waving and drumming displays, suggesting that drumming adheres to some predictions of the redundant signal hypothesis for multimodal signalling. In field experiments, we show that recent courtship is associated with a significant reduction in male sprint speed, which is commensurate with an oxygen debt. Even so, males that wave and drum more vigorously than their counterparts have a higher sprint speed. Drumming appears to be an energetically costly multimodal display of quality that females should attend to when making their mate choice decisions.

No MeSH data available.


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The relationship between burrow volume and the peak frequency of cheliped drumming.
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RSOS161093F6: The relationship between burrow volume and the peak frequency of cheliped drumming.

Mentions: Larger males did not drum at a higher frequency (hertz) or amplitude (decibel) (table 5). Larger males constructed larger volume burrows (rs = 0.452, N = 89, p < 0.001). The peak frequency (hertz) of drumming from within the burrow was higher for males with larger burrows (table 6, figure 6), and this remained the case even after controlling for male size (partial correlation, r = 0.352, N = 72, p = 0.003). There was, however, no relationship between burrow volume and the amplitude (decibel) of drumming. Finally, males with larger burrows produced more drums per bout (r = 0.245, d.f. = 85, p = 0.022), although this was driven by larger males producing more drums per bout (partial correlation, r = 0.219, N = 87, p = 0.043) rather than burrow volume being directly linked to drumming vigour (partial correlation, r = 0.143, N = 87, p = 0.189).Table 5.


Multimodal communication in courting fiddler crabs reveals male performance capacities
The relationship between burrow volume and the peak frequency of cheliped drumming.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5383853&req=5

RSOS161093F6: The relationship between burrow volume and the peak frequency of cheliped drumming.
Mentions: Larger males did not drum at a higher frequency (hertz) or amplitude (decibel) (table 5). Larger males constructed larger volume burrows (rs = 0.452, N = 89, p < 0.001). The peak frequency (hertz) of drumming from within the burrow was higher for males with larger burrows (table 6, figure 6), and this remained the case even after controlling for male size (partial correlation, r = 0.352, N = 72, p = 0.003). There was, however, no relationship between burrow volume and the amplitude (decibel) of drumming. Finally, males with larger burrows produced more drums per bout (r = 0.245, d.f. = 85, p = 0.022), although this was driven by larger males producing more drums per bout (partial correlation, r = 0.219, N = 87, p = 0.043) rather than burrow volume being directly linked to drumming vigour (partial correlation, r = 0.143, N = 87, p = 0.189).Table 5.

View Article: PubMed Central - PubMed

ABSTRACT

Courting males often perform different behavioural displays that demonstrate aspects of their quality. Male fiddler crabs, Uca sp., are well known for their repetitive claw-waving display during courtship. However, in some species, males produce an additional signal by rapidly stridulating their claw, creating a &lsquo;drumming&rsquo; vibrational signal through the substrate as a female approaches, and even continue to drum once inside their burrow. Here, we show that the switch from waving to drumming might provide additional information to the female about the quality of a male, and the properties of his burrow (multiple message hypothesis). Across males there was, however, a strong positive relationship between aspects of their waving and drumming displays, suggesting that drumming adheres to some predictions of the redundant signal hypothesis for multimodal signalling. In field experiments, we show that recent courtship is associated with a significant reduction in male sprint speed, which is commensurate with an oxygen debt. Even so, males that wave and drum more vigorously than their counterparts have a higher sprint speed. Drumming appears to be an energetically costly multimodal display of quality that females should attend to when making their mate choice decisions.

No MeSH data available.


Related in: MedlinePlus