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Multimodal communication in courting fiddler crabs reveals male performance capacities

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 ‘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.


The interaction between male carapace width, performance capacity and whether a male escalated, de-escalated or maintained a static rate of signalling.
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RSOS161093F5: The interaction between male carapace width, performance capacity and whether a male escalated, de-escalated or maintained a static rate of signalling.

Mentions: For the second and third performance trials (1 and 2 h later), there were significant differences in sprint speed between the three types of males (GLM: Trial 2: z = 2.199, p = 0.028; Trial 3: z = 1.990, p = 0.047; both d.f. = 76, figure 4). There was also a difference among male types in the relationship between body size and sprint speed (GLM: Trial 2: z = −2.255, p = 0.024; Trial 3: z = −1.992, p = 0.046; both d.f. = 76; figure 5). Among males that reduced their courtship display vigour, larger males sprinted faster (Trial 2: r = 0.664, p = 0.002; Trial 3: r = 0.502, p = 0.028; both d.f. = 17). There was no such relationship for males that did not change their courtship display vigour (r = 0.173, p = 0.235; r = 0.177, p = 0.223; both d.f. = 47), or for those that escalated their display vigour (Trial 2: r = −0.152, p = 0.603; Trial 3: r = −0.156, p = 0.592; both d.f. = 12).Figure 4.


Multimodal communication in courting fiddler crabs reveals male performance capacities
The interaction between male carapace width, performance capacity and whether a male escalated, de-escalated or maintained a static rate of signalling.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

RSOS161093F5: The interaction between male carapace width, performance capacity and whether a male escalated, de-escalated or maintained a static rate of signalling.
Mentions: For the second and third performance trials (1 and 2 h later), there were significant differences in sprint speed between the three types of males (GLM: Trial 2: z = 2.199, p = 0.028; Trial 3: z = 1.990, p = 0.047; both d.f. = 76, figure 4). There was also a difference among male types in the relationship between body size and sprint speed (GLM: Trial 2: z = −2.255, p = 0.024; Trial 3: z = −1.992, p = 0.046; both d.f. = 76; figure 5). Among males that reduced their courtship display vigour, larger males sprinted faster (Trial 2: r = 0.664, p = 0.002; Trial 3: r = 0.502, p = 0.028; both d.f. = 17). There was no such relationship for males that did not change their courtship display vigour (r = 0.173, p = 0.235; r = 0.177, p = 0.223; both d.f. = 47), or for those that escalated their display vigour (Trial 2: r = −0.152, p = 0.603; Trial 3: r = −0.156, p = 0.592; both d.f. = 12).Figure 4.

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 ‘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.