Cryptic asymmetry: unreliable signals mask asymmetric performance of crayfish weapons

Angilletta, Michael J.; Wilson, Robbie S.

doi:10.1098/rsbl.2012.0029

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…Takeuchi et al (2008) suggested that shrimp has an innate left-right lateral movement ability in terms of their escape direction, which may affect prey-predator interactions. Crayfish use their limbs during aggression; asymmetries of limb performance could affect this behavior (Angilletta and Wilson 2012). Levin et al (2016) have suggested that left and right asymmetries in organisms arise from embryogenesis.…”

Section: Introductionmentioning

confidence: 99%

Left-right asymmetry in firing rate of extra-retinal photosensitive neurons in the crayfish

Pacheco-Ortiz¹,

Sánchez-Hernández²,

Rodrı́guez-Sosa³

et al. 2018

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The purpose of this paper is to explore the firing rate of the caudal photoreceptors (CPRs) from the sixth abdominal ganglion of the crayfish Cherax quadricarinatus. We use simultaneous extracellular recordings on left and right CPR in the isolated ganglion (n = 10). The CPRs showed an asymmetry in the spontaneous activity and light-induced response. In darkness, we observed one subgroup (70%) in which the left CPR (CPR-L) and right CPR (CPR-R) had spontaneous firing rates with a median of 18 impulses/s and 6 impulses/s, respectively. In another subgroup (20%), the CPR-R had a median of 15 impulses/s and the CPR-L had 8 impulses/s. In both groups, the differences were significant. Furthermore, the CPRs showed an asymmetrical photoresponse induced by a pulse of white light (700 Lux, 4 s). In one subgroup (30%), the CPR-L showed light-induced activity with a median of 73%, (interquartile range, IQR = 51), while the CPR-R had a median of 41%, (IQR = 47). In another subgroup (70%), the CPR-R showed a median of 56%, (IQR = 51) and the CPR-L had a median of 42%, (IQR = 46). In both groups, the differences were significant. Moreover, we observed a differential effect of temperature on CPR activity. These results suggest a functional asymmetry in both activities from left and right CPRs. These CPR activity fluctuations may modulate the processing of information by the nervous system.

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Section: Introductionmentioning

confidence: 99%

Left-right asymmetry in firing rate of extra-retinal photosensitive neurons in the crayfish

Pacheco-Ortiz¹,

Sánchez-Hernández²,

Rodrı́guez-Sosa³

et al. 2018

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“…Dishonest signaling of strength is quite common in some species of insects (Steger and Caldwell 1983;Adams and Caldwell 1990) and crustaceans (Backwell et al 2000;Lailvaux et al 2009;Walter et al 2011;Angilletta and Wilson 2012). Our data showed that more than 20% of males had regenerated claws, which are weaker than the originals, but strongly resemble the original claws in length.…”

Section: Bluff and Counter-bluff Tacticsmentioning

confidence: 52%

“…Although there must be limits on how often deceptive signals can be used before they lose their effect (Maynard Smith and Harper 2003), each signaling system allows some admixture of deception as long as the signal response is adaptive on average (Semple and McComb 1996;Searcy and Nowicki 2005). Indeed, dishonest signaling is commonly seen in the animal world (e.g., Steger and Caldwell 1983;Adams and Caldwell 1990;Backwell et al 2000;Candolin 2000;Elwood et al 2006;Wilson et al 2007;Munoz et al 2008;Lailvaux et al 2009;Walter et al 2011;Angilletta and Wilson 2012).…”

Section: Introductionmentioning

confidence: 99%

Fighting with an unreliable weapon: opponent choice and risk avoidance in fiddler crab contests

Muramatsu

Koga

2016

Behav Ecol Sociobiol

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Current signaling theories predict that animal signals are generally honest, but each signaling system allows some admixture of deception. Male fiddler crabs fight aggressively through use of their greatly enlarged major claw, which grows on the left or right side. Some males have fragile regenerated claws (regenerated males) and others have robust original claws (original males), but crabs cannot visually discriminate between the two types. In the present study, we conducted field observations in a population of Uca lactea to investigate how regenerated males fight with their inferior weapons, and how other males deal with the potential deception. Regenerated males employed bluffing tactics; they pretended to be aggressive to deter opponents, but surrendered when the fight escalated. Regenerated males tended to choose smaller and opposite-handed opponents, probably because claws can be grappled tightly in same-handed fights. The bluffing tactics seemed to be partially successful, because regenerated males were not selectively challenged by other males and defeated original males in 41.7% of the cases. However, original males developed counter-bluff tactics, such as choosing same-handed opponents and persisting in contests even when the opponent was larger. Consequently, original males defeated regenerated males equipped with a longer claw in 42.9% of the cases. In the most striking case, an original male evicted a resident male from his burrow despite the 42.7% longer regenerated claw. This counter-bluff tactic decreases the reliance on the signal of strength (weapon size) and limits the benefit of bluffing.

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“…Left-right asymmetry is a characteristic of the brain from vertebrate species and some invertebrate species [24], which arises from embryogenesis in the organism [25][26][27]. Crustacean decapods showed the left and right asymmetry in some anatomical regions [28][29][30]. Besides, some functional properties are asymmetric, as examples, lateral movement towards escape direction in shrimp [29], and the performance of limbs during aggressive behavior of crayfish [30].…”

Section: Introductionmentioning

confidence: 99%

“…Crustacean decapods showed the left and right asymmetry in some anatomical regions [28][29][30]. Besides, some functional properties are asymmetric, as examples, lateral movement towards escape direction in shrimp [29], and the performance of limbs during aggressive behavior of crayfish [30]. The sixth AG develops from two embryonic neuromeres in the crayfish Procambarus clarkii [31,32].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Firing Rate from Crayfish Left and Right Caudal Photoreceptors Due to Blue and Green Monochromatic Light Pulses

et al. 2018

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Recent studies have postulated that the left and right caudal photoreceptors (CPR-L and CPR-R, respectively) of the crayfish show asymmetry of spontaneous activity in darkness and responses induced by white light. Two photopigments have been identified; the first one sensitive to blue light and the second one sensitive to green light. This study explores blue and green monochromatic light responsiveness with respect to both CPR-L and -R, as well as the effects of temperature on these photoreceptors. We performed simultaneous extracellular recordings of the firing rate of action potentials from CPRs of the crayfish Cherax quadricarinatus (n = 12). At room temperature (24 ± 1 °C), CPR-L and -R showed a significant difference in the spikes from most of the comparations. CPRs in the dark exhibited spontaneous asymmetric activity and displayed sensitivity to both monochromatic light sources. CPR responses were light intensity dependent within a range of 1.4 logarithmic intensity units, showing approximately 0.5 logarithmic intensity units more sensitivity to blue than to green light. The CPRs displayed an asymmetrical response to both colors by using a constant light intensity. At 14 (±1) °C, activity in darkness diminished while asymmetry persisted, and the CPRs improved responses for both monochromatic light sources, displaying a significant asymmetry. Here, we provide additional evidence of the asymmetric activity in darkness and light response from the CPRs. The new data allow further investigations regarding the physiological role of caudal photoreceptors in the crayfish.

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Cryptic asymmetry: unreliable signals mask asymmetric performance of crayfish weapons

Cited by 12 publications

References 18 publications

Left-right asymmetry in firing rate of extra-retinal photosensitive neurons in the crayfish

Left-right asymmetry in firing rate of extra-retinal photosensitive neurons in the crayfish

Fighting with an unreliable weapon: opponent choice and risk avoidance in fiddler crab contests

Asymmetric Firing Rate from Crayfish Left and Right Caudal Photoreceptors Due to Blue and Green Monochromatic Light Pulses

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