scholarly journals Ants modulate stridulatory signals depending on the behavioural context

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Masoni ◽  
F. Frizzi ◽  
R. Nieri ◽  
L. P. Casacci ◽  
V. Mazzoni ◽  
...  
Keyword(s):  
Chemical Communication ◽  
Significant Role ◽  
Communication System ◽  
Communication Channel ◽  
Food Resource ◽  
Effective Communication ◽  
Dominant Frequency ◽  
Insect Societies ◽  
The Mediterranean ◽  
Eusocial Species

AbstractInsect societies require an effective communication system to coordinate members’ activities. Although eusocial species primarily use chemical communication to convey information to conspecifics, there is increasing evidence suggesting that vibroacoustic communication plays a significant role in the behavioural contexts of colony life. In this study, we sought to determine whether stridulation can convey information in ant societies. We tested three main hypotheses using the Mediterranean ant Crematogaster scutellaris: (i) stridulation informs about the emitter’caste; (ii) workers can modulate stridulation based on specific needs, such as communicating the profitability of a food resource, or (iii) behavioural contexts. We recorded the stridulations of individuals from the three castes, restrained on a substrate, and the signals emitted by foragers workers feeding on honey drops of various sizes. Signals emitted by workers and sexuates were quantitatively and qualitatively distinct as was stridulation emitted by workers on different honey drops. Comparing across the experimental setups, we demonstrated that signals emitted in different contexts (restraining vs feeding) differed in emission patterns as well as certain parameters (dominant frequency, amplitude, duration of chirp). Our findings suggest that vibrational signaling represents a flexible communication channel paralleling the well-known chemical communication system.

scholarly journals Chemical Variation among Castes, Female Life Stages and Populations of the Facultative Eusocial Sweat Bee Halictus rubicundus (Hymenoptera: Halictidae)

2021 ◽  
Author(s):  
Iris Steitz ◽  
Robert J Paxton ◽  
Stefan Schulz ◽  
Manfred Ayasse
Keyword(s):  
Chemical Communication ◽  
North American ◽  
Specific Chemical ◽  
Eusocial Insects ◽  
Queen Signal ◽  
Ovarian Activation ◽  
Chemical Profiles ◽  
Reproductive Division Of Labor ◽  
Reproductive Division ◽  
Eusocial Species

AbstractIn eusocial insects, chemical communication is crucial for mediating many aspects of social activities, especially the regulation of reproduction. Though queen signals are known to decrease ovarian activation of workers in highly eusocial species, little is known about their evolution. In contrast, some primitively eusocial species are thought to control worker reproduction through physical aggression by the queen rather than via pheromones, suggesting the evolutionary establishment of chemical signals with more derived sociality. However, studies supporting this hypothesis are largely missing. Socially polymorphic halictid bees, such as Halictus rubicundus, with social and solitary populations in both Europe and North America, offer excellent opportunities to illuminate the evolution of caste-specific signals. Here we compared the chemical profiles of social and solitary populations from both continents and tested whether (i) population or social level affect chemical dissimilarity and whether (ii) caste-specific patterns reflect a conserved queen signal. Our results demonstrate unique odor profiles of European and North American populations, mainly due to different isomers of n-alkenes and macrocyclic lactones; chemical differences may be indicative of phylogeographic drift in odor profiles. We also found common compounds overproduced in queens compared to workers in both populations, indicating a potential conserved queen signal. However, North American populations have a lower caste-specific chemical dissimilarity than European populations which raises the question if both use different mechanisms of regulating reproductive division of labor. Therefore, our study gives new insights into the evolution of eusocial behavior and the role of chemical communication in the inhibition of reproduction.

scholarly journals HYPOTHESES TESTING ON THE VALIDITY OF EFFECTIVE COMMUNICATION AND COMMON MOTIF OF SELAYAH KERINGKAM

2021 ◽  
Vol 4 (1) ◽  
pp. 98-117
Author(s):  
Norsyahbany Mansor ◽  
Qistina Donna Lee Abdullah
Keyword(s):  
Communication Channel ◽  
Effective Communication ◽  
The Body ◽  
Hypotheses Testing ◽  
Independent Variables ◽  
Body Of Knowledge ◽  
Common Motif ◽  
Dependent Variables ◽  
Research Questions ◽  
New Framework

This paper is to deliberate the subjects of the effective communication channel in delivering common motifs in Selayah Keringkam by assessing the local and International tourists’ preference. It is to evaluate the hypotheses Testing On validity of Effective Communication and Common Motif of Selayah Keringkam Towards the communication channel. The finding of this paper is to enhance the implications on developing a significant way to disseminate Selayah Keringkam as a heritage product in Sarawak. This paper will expose a substantial relationship between the independent variables (Common Motif of Selayah Keringkam), the dependent variables (Channels of Communication) and the mediator (Supplement of Effective Communication) as a new framework to the body of knowledge. This research involved 384 respondents with 5 relevant authorities related to answering research questions. The data collected from the fieldwork were analysed using SPSS version 24. The measures used in this article are methodically deliberated using factor analysis and correlation analysis. Lastly, the results of the regression analyses testing on hypotheses and summary of hypotheses assessments are presented.

High Altitude Platform-Based Communication System under LDPC Coding in DVB-S2 Standard

2014 ◽  
Vol 602-605 ◽  
pp. 3687-3692
Author(s):  
Jian Yun Zheng ◽  
Kai Ji ◽  
Yi Sheng Zhu
Keyword(s):  
Statistical Model ◽  
High Altitude ◽  
Communication System ◽  
Communication Channel ◽  
Numerical Results ◽  
Code Length ◽  
High Altitude Platform ◽  
Modulation Methods

The statistical model is used for analyzing the characteristic of the HAP-based communication channel, the structure and algorithm of LDPC encoding and decoding in DVB-S2 are studied, the LDPC BICM system over the HAP-based communication channel are established. Numerical results show the effects of different code length and coderate under different modulation methods.

Using the technology acceptance model to analyze ease of use of a mobile communication system

2011 ◽  
Vol 39 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Chih-Yung Tsai ◽  
Chih-Chiang Wang ◽  
Ming-Te Lu
Keyword(s):  
Technology Acceptance ◽  
Technology Acceptance Model ◽  
Mobile Technology ◽  
Mobile Communication ◽  
Communication System ◽  
Effective Communication ◽  
Ease Of Use ◽  
Communication Medium ◽  
Acceptance Model ◽  
Willingness To Use

The usability of mobile technology has been found to affect the attitudes of users and their willingness to use it, and furthermore to influence the effectiveness of communication. Accordingly, when mobile technology is developed as a communication medium, the product should be designed to be easy to operate and fit into users' everyday lives. This would mean that more people would be willing to adopt the technology, resulting in more effective communication.

scholarly journals The wing scales of the Mother-of-pearl butterfly, Protogoniomorpha parhassus, are thin film reflectors causing strong iridescence and polarization

2021 ◽  
Author(s):  
Doekele G. Stavenga
Keyword(s):  
Thin Film ◽  
Communication System ◽  
Effective Communication ◽  
Spectral Shape ◽  
Degree Of Polarization ◽  
Structural Color ◽  
Light Interference ◽  
Reflected Light ◽  
Intraspecific Communication ◽  
Wing Scales

The dorsal wings of the Mother-of-pearl butterfly, Protogoniomorpha parhassus, display an angle-dependent pink, structural color. This effect is created by light interference in the lower lamina of the wing scales, which acts as an optical thin film. The scales feature extremely large windows that enhance the scale reflectance, because the upper lamina of ridges and crossribs is very sparse. Characteristic for thin film reflectors, the spectral shape of the reflected light strongly depends on the angle of light incidence, shifting from pink to yellow when changing the angles of illumination and observation from normal to skew, and also the degree of polarization strongly varies. The simultaneous spectral and polarization changes serve a possibly widespread, highly effective communication system among butterflies for intraspecific communication during flight.

scholarly journals O agir democrático numa era de redes digitais

Compolítica ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 7
Author(s):  
Stephen Coleman
Keyword(s):  
Twentieth Century ◽  
Deliberative Democracy ◽  
Political Communication ◽  
Significant Role ◽  
Communication System ◽  
Digital Technologies ◽  
Political Elites ◽  
Political Messages ◽  
Contemporary Politics ◽  
Capability Building

<p><strong>RESUMO</strong></p><p><strong></strong>A política contemporânea possui uma qualidade transitória e indeterminada, pairando de forma inquieta entre o centralizado e o em rede, o nacional e o global, o gerenciado e o populista, o analógico e o digital. Práticas políticas antes tomadas como certas começaram a parecer instáveis e modos emergentes de articulação política estão desestabilizando complacências institucionais. Ao longo do século XX, a consolidação de democracias políticas gerou abordagens de rotina à produção, ao processamento e à comunicação de mensagens políticas. Este sistema de comunicação política resultou em relações previsíveis entre elites políticas, mediadores jornalísticos e cidadãos. Como espero ter deixado claro nesta palestra, seria ingênuo supor que simplesmente mover a comunicação política online irá enriquecer ou degradar as vozes dos cidadãos democráticos. O antigo debate entre o bem e o mal da internet é despropositado e redundante. Porém, se a pressão democrática popular pelo tipo de construção de capacidade cívica que eu elenquei nesta palestra ganhar tração, tecnologias digitais, espaços e códigos podem, realmente, ter um papel significativo em facilitar práticas conducentes a uma democracia mais inclusiva, respeitosa e deliberativa. </p><p> </p><p class="p3"><strong>ABSTRACT</strong></p><p class="p3">Contemporary politics has a transitional and indeterminate quality, hovering uneasily between, the centralised and the networked, the national and the global, the managed and the populist and the analogue and the digital. Once taken-for-granted political practices have begun to seem unstable and emergent modes of political articulation are unsettling institutional complacencies. During the course of the twentieth century the consolidation of political democracies generated routine approaches to producing, processing, and communicating political messages. This political communication system resulted in predictable relations between political elites, journalistic mediators and citizens. As I hope I have made clear in this lecture, it would be naïve to assume that simply moving political communication online will either enrich or degrade the voices of democratic citizens. The old debate between Internet-Good and Internet-Bad is pointless and redundant. But if popular democratic pressure for the kind of civic capability-building that I have outlined in this lecture were to gain traction, digital technologies, spaces and codes might indeed play a significant role in facilitating practices conducive to a more inclusive, respectful and deliberative democracy.</p>

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