Multimodal signals: ultraviolet reflectance and chemical cues in stomatopod agonistic encounters

Franklin, Amanda M.; Marshall, N. Justin; Lewis, Sara M.

doi:10.1098/rsos.160329

Cited by 15 publications

(6 citation statements)

References 47 publications

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“…This agrees with previous findings in Sceloporus, where headbob displays were more common in response to a visual-only stimulus, whereas tongue flicks were more likely when lizards were presented with chemical secretions only [24,31]. Multimodal (visual + chemical) signallers may not always preferentially rely on visual cues, like mantis shrimp (Neogonodactylus oerstedii) [55] or wolf spiders (Pardosa milvina) [56], which are more chemically reliant during male contests and courtship, respectively. Staged territorial intrusions were designed to act mostly as a visual stimulus.…”

Section: (B) Responses To Visual Stimuli Are Common and Conserved Across Taxasupporting

confidence: 91%

Evolutionary loss of a signalling colour is linked to increased response to conspecific chemicals

et al. 2021

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Behavioural responses to communicative signals combine input from multiple sensory modalities and signal compensation theory predicts that evolutionary shifts in one sensory modality could impact the response to signals in other sensory modalities. Here, we conducted two types of field experiments with 11 species spread across the lizard genus Sceloporus to test the hypothesis that the loss of visual signal elements affects behavioural responses to a chemical signal (conspecific scents) or to a predominantly visual signal (a conspecific lizard), both of which are used in intraspecific communication. We found that three species that have independently lost a visual signal trait, a colourful belly patch, responded to conspecific scents with increased chemosensory behaviour compared to a chemical control, while species with the belly patch did not. However, most species, with and without the belly patch, responded to live conspecifics with increased visual displays of similar magnitude. While aggressive responses to visual stimuli are taxonomically widespread in Sceloporus , our results suggest that increased chemosensory response behaviour is linked to colour patch loss. Thus, interactions across sensory modalities could constrain the evolution of complex signalling phenotypes, thereby influencing signal diversity.

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Section: (B) Responses To Visual Stimuli Are Common and Conserved Across Taxasupporting

confidence: 91%

Evolutionary loss of a signalling colour is linked to increased response to conspecific chemicals

et al. 2021

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“…No other naturally occurring microbial rhodopsin ever showed a peak absorption beyond 610 nm 9 , and the spectra from only a few animal rhodopsins have been predicted as such, including the goldfish and salamander red cones ( λ max = 617 nm and 615 nm, respectively), both incorporating 3,4-dehydroretinal (A2-retinal) as chromophore 10 . Some of the many rhodopsins from crustacean shrimps, however, may have indeed maxima near 700 nm, a range that is far beyond human and any other known animal vision 11 . However, these photoreceptor proteins remain uncharacterized, and their light-sensitive cofactors are unknown.…”

Section: Resultsmentioning

confidence: 98%

NeoR, a near-infrared absorbing rhodopsin

et al. 2020

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The Rhizoclosmatium globosum genome encodes three rhodopsin-guanylyl cyclases (RGCs), which are predicted to facilitate visual orientation of the fungal zoospores. Here, we show that RGC1 and RGC2 function as light-activated cyclases only upon heterodimerization with RGC3 (NeoR). RGC1/2 utilize conventional green or blue-light-sensitive rhodopsins (λmax = 550 and 480 nm, respectively), with short-lived signaling states, responsible for light-activation of the enzyme. The bistable NeoR is photoswitchable between a near-infrared-sensitive (NIR, λmax = 690 nm) highly fluorescent state (QF = 0.2) and a UV-sensitive non-fluorescent state, thereby modulating the activity by NIR pre-illumination. No other rhodopsin has been reported so far to be functional as a heterooligomer, or as having such a long wavelength absorption or high fluorescence yield. Site-specific mutagenesis and hybrid quantum mechanics/molecular mechanics simulations support the idea that the unusual photochemical properties result from the rigidity of the retinal chromophore and a unique counterion triad composed of two glutamic and one aspartic acids. These findings substantially expand our understanding of the natural potential and limitations of spectral tuning in rhodopsin photoreceptors.

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“…Male Lysiosquillina glabriuscula, for example, threaten their opponents by raising the head and thorax, spreading the striking appendages and other maxillipeds, and laterally extending the prominent, oval antennal scales. Such displays are accentuated by colour patterns emitted both in the visual and UV spectrum (Cronin et al, ; Franklin, Marshall, & Lewis, ). Fluorescent coloration contributes to signal brightness and visibility of yellow spots, particularly at greater depths.…”

Section: Visual Cuesmentioning

confidence: 99%

“…Rock mantis shrimp, for example, communicate their RHP and aggressive motivation by using chemical cues and performing threat displays showing a coloured patch, that reflects UV light. These different signals appear to work in non‐redundancy and transfer different information: The UV reflectance and/or luminance of the colour patch appears to amplify the threat displays of the male, whereas chemical cues indicate size and identity (Franklin et al, ). While evidence for such multimodal communication during aggressive encounters is thus far limited to a small number of aquatic and terrestrial species (e.g., Ballentine, Searcy, & Nowicki, ; Green & Patek, ; Stuart‐Fox, Firth, Moussalli, & Whiting, ), there is no reason to assume that this phenomenon is not widespread.…”

Section: Multimodal Communicationmentioning

confidence: 99%

Aggressive communication in aquatic environments

Frommen

2019

Functional Ecology

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1. Aggressive interactions are ubiquitous among animals. They are either directed towards heterospecifics, like predators or competitors, or conspecifics. During intraspecific encounters, aggression often serves to establish hierarchies within the social group. Thus, in order to understand the mechanisms mediating social organization, it is important to comprehend the escalation and avoidance of aggressive behaviour.2. Overt aggressive interactions are costly not only in terms of increased risk of injury or death, but also due to opportunity costs and energy expenditure. In order to reduce these costs, animals are expected to communicate their strength and aggressive motivation prior to fights. For this purpose, they use different means of communication in various sensory modalities, that is visual, acoustic, chemical, mechanosensory and electric cues. These different modalities can convey different or similar information, underlining the importance of understanding the multimodal communication of aggression.3. Thus far, most studies on signalling during aggressive encounters have focussed on visual or acoustic cues, most likely as these are the two modalities predominantly used by humans. However, depending on the species' ecology, visual or acoustic cues might play a minor role for many species. Especially in aquatic systems, visual communication is often hampered due to high levels of turbidity or limited light conditions. Here, alternative modalities such as chemical, mechanical or electrical cues are expected to play a prominent role. 4. In this review, I provide an overview of different modalities used during aggressive communication in aquatic organisms. I highlight the importance of studying the role of multimodal communication during aggressive encounters in general and discuss the importance of understanding aquatic communication in the light of conservation and animal welfare issues. K E Y W O R D S acoustic cues, aggression, chemical cues, contest theory, electric cues, mechanosensory cues, multimodal communication, visual cues | 365 Functional Ecology FROMMEN 1 | INTRODUC TI ON Most interactions between individuals involve some form of communication. Animals communicate when coordinating cooperative behaviours, choosing a mating partner, raising their offspring or avoiding predators. Understanding animal communication is thus crucial to understand animal behaviour in general. Consequently, animal communication has become a central topic in behavioural research within the last decades, witnessed by the publication of considerable numbers of scientific studies and textbooks focussing on different facets of this fascinating topic, ranging from the physiological foundations to the evolutionary consequences of animal communication (e.g., Bradbury & Vehrencamp, 1998; Maynard Smith & Harper, 2003; Stevens, 2013). Given the ubiquitous importance of animal communication in multifarious fields of research, it is not astonishing that there exists a huge variety of different definitions of terms. Box 1 provides ...

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Multimodal signals: ultraviolet reflectance and chemical cues in stomatopod agonistic encounters

Cited by 15 publications

References 47 publications

Evolutionary loss of a signalling colour is linked to increased response to conspecific chemicals

Evolutionary loss of a signalling colour is linked to increased response to conspecific chemicals

NeoR, a near-infrared absorbing rhodopsin

Aggressive communication in aquatic environments

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