Habitat selection and territoriality

2018 ◽  
Author(s):  
Darrell J. Kemp
Keyword(s):  
Habitat Selection ◽  
Empirical Data ◽  
Sex Roles ◽  
Mating Systems ◽  
Resource Holding Potential ◽  
Resource Value ◽  
Site Occupation ◽  
Freshwater Habitats ◽  
Aggressive Motivation

Insects dominate virtually all terrestrial and freshwater habitats on earth. This chapter reviews insect habitat selection, focusing on the occupation and defence of mating sites. First the adaptive basis of mating systems, sex roles, and behaviors in regard to habitat are established, then site occupation and defence in territorial species is explored. Resource-holding potential and resource value are discussed for how they determine aggressive motivation, as well as how contestants seek to gauge such parameters, with particular attention to the role of convention, drawing upon exemplar studies in damselflies and butterflies that have provided a narrative between theory and empiricism. Conventional and/or plastic behaviors are also discussed in terms of the presence and certainty of contestant roles, encompassing phenomena, such as residency confusion, nasty neighbours and interloper effects. The chapter concludes by discussing future avenues, foremost among which is the opportunity to synthesize empirical data across taxa.

scholarly journals Frustrative reward omission increases aggressive behaviour of inferior fighters

2014 ◽  
Vol 281 (1784) ◽  
pp. 20140300 ◽  
Author(s):  
Marco A. Vindas ◽  
Ida B. Johansen ◽  
Sergio Vela-Avitua ◽  
Karoline Sletbak Nørstrud ◽  
Marion Aalgaard ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Cognitive Processes ◽  
Physiological Response ◽  
Aggressive Behaviour ◽  
Affective State ◽  
Resource Holding Potential ◽  
Resource Value ◽  
Evolutionarily Conserved ◽  
Aggressive Motivation ◽  
Gain Access

Animals use aggressive behaviour to gain access to resources, and individuals adjust their behaviour relative to resource value and own resource holding potential (RHP). Normally, smaller individuals have inferior fighting abilities compared with larger conspecifics. Affective and cognitive processes can alter contest dynamics, but the interaction between such effects and that of differing RHPs has not been adjudged. We investigated effects of omission of expected reward (OER) on competing individuals with contrasting RHPs. Small and large rainbow trout ( Oncorhynchus mykiss ) were conditioned to associate a light with reward. Thereafter, the reward was omitted for half of the fish prior to a contest between individuals possessing a 36–40% difference in RHP. Small control individuals displayed submissive behaviour and virtually no aggression. By contrast, small OER individuals were more aggressive, and two out of 11 became socially dominant. Increased aggression in small OER individuals was accompanied by increased serotonin levels in the dorsomedial pallium (proposed amygdala homologue), but no changes in limbic dopamine neurochemistry were observed in OER-exposed individuals. The behavioural and physiological response to OER in fish indicates that frustration is an evolutionarily conserved affective state. Moreover, our results indicate that aggressive motivation to reward unpredictability affects low RHP individuals strongest.

Maximum fluid concentrations of materials released from platelets at a surface

1983 ◽  
Vol 244 (1) ◽  
pp. H109-H114 ◽  
Author(s):  
G. A. Adams ◽  
I. A. Feuerstein
Keyword(s):  
Platelet Aggregation ◽  
Empirical Data ◽  
Maximum Amount ◽  
Inhibit Platelet Aggregation ◽  
Fluid Concentration ◽  
Diffusion And Convection ◽  
Platelet Accumulation ◽  
Von Willebrand ◽  
Willebrand Factor

We examine the estimation of local concentrations of materials that are released from the dense and alpha-granules of platelets during accumulation of platelets upon collagen-coated glass. Platelet/red blood cell suspensions were perfused through a 1.3-mm-ID tube. Empirical data were used in a calculation procedure, based on diffusion and convection, designed to yield an upper bound on the interfacial fluid concentration (IFC) for each substance considered. The necessary empirical data are the rate of platelet accumulation and the maximum amount of material in the platelet capable of secretion. It was found that the IFC is dependent on the shear rate at the surface (G) and is proportional to G0.27. This means that an eightfold increase in flow rate would increase the IFCs approximately twofold. Serotonin, pyrophosphate, adenosine 5'-monophosphate (AMP), and adenosine 5'-triphosphate (ATP) were found not to be present in sufficient quantities to produce IFCs that could influence platelet aggregation if used alone at the IFC. A second set of materials, fibrinogen, fibronectin von Willebrand factor, and calcium, had IFCs less than their concentrations normally found in plasma. A third category, containing adenosine 5'-diphosphate (ADP) alone, had an IFC close to those known to affect platelet aggregation. The role of metabolites of arachidonic acid, which may promote or inhibit platelet aggregation, awaits further description.

A Study on the Prevalence and Nature of Ragging Practices in Selected Educational Institutions in India

2018 ◽  
Vol 15 (2) ◽  
pp. 187-202
Author(s):  
Mohan Rao ◽  
Shobna Sonpar ◽  
Amit Sen ◽  
Shekhar P. Seshadri ◽  
Harsh Agarwal ◽  
...  
Keyword(s):  
Empirical Data ◽  
Print Media ◽  
Institutional Factors ◽  
Educational Institutions ◽  
Critical Factors ◽  
Place Of Residence ◽  
The Media ◽  
Media Reports

Ragging has claimed hundreds of innocent lives and has ruined the careers of thousands of students. A total of 717 cases of ragging were reported in the English print media alone across the country from January 2007 to September 2013. However, the media reports tend to focus on extreme cases and do not reveal the true extent of ragging. Moreover, in the absence of empirical data, it is difficult to understand the processes involved in, and the ramifications of, ragging. This study examines the prevalence and types of ragging practices in educational institutions. The study covered 10,632 students from 37 educational institutions spread across 12 states in India. Findings show that almost 40 per cent students admitted to having experienced some kind of ragging. College-wise analysis of the results showed marked variations in the prevalence of ragging among colleges, thus pointing to the role of institutional factors in the occurrence of ragging. Variations in responses are also seen based on the kind of course pursued, gender, and place of residence of student, thus indicating that these are critical factors in influencing the prevalence, severity and kinds of ragging practices.

scholarly journals Empathic Behavior in Early Childhood under Condition of Taking the Mom’s Role in the Play

2018 ◽  
Vol 10 (4) ◽  
pp. 23-30
Author(s):  
T.O. Yudina
Keyword(s):  
Early Childhood ◽  
Prosocial Behavior ◽  
Empirical Data ◽  
Role Playing ◽  
Role Taking ◽  
Mediating Role ◽  
The Difference ◽  
Empathic Behavior

Following the modern theoretical and empirical data on the problem of relation between the role-taking and empathy abilities we supposed that empathic behavior in early childhood could be realized through acquiring the role “mom” within the role playing. In order to test our suppose we have conducted the ingroup experiment with 36 toddlers (M=35 months) and compared the frequency of the empathic behavior under two conditions: 1) taking the role of mom and 2) taking the role of friend by the toddler withing the experimental story-play with toys. According to our hypothesis we expected that children would display the empathic behavior more frequent in the condition of taking the mom’s role. Our hypothesis was not confirmed since the difference between conditions has been not significant. Such results reveal that the parental models do not serve significant mediating role in the child’s learning of prosocial behavior.

scholarly journals ANALISIS PERANAN USAHA KECIL DAN MENENGAH TERHADAP PENYERAPAN TENAGA KERJA DI KABUPATEN KEBUMEN

2019 ◽  
Vol 18 (1) ◽  
pp. 26-35
Author(s):  
Anton Prasetyo ◽  
Miftahul Huda
Keyword(s):  
Regression Analysis ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Empirical Data ◽  
Small And Medium Enterprises ◽  
Research Data ◽  
Sales Volume ◽  
Test Tool ◽  
Medium Enterprises

This research aims to analyze the factors that influence the role of Small and Medium Enterprises (SMEs) on employment, namely capital, sales volume, type of business, length of business, and wages. Empirical data is presented to prove that the role of small and medium enterprises on employment is influenced by capital, sales volume, type of business, length of business, and wages. Multiple regression analysis through the SPSS program was used as a research test tool. The research data was obtained from SMEs businesses, Central Bureau of Statistics and the SMEs Office to test scientifically whether capital, sales volume, type of business, duration of business, and wages affect employment. Research results show that the duration of the business influences the absorption of labor while capital, sales volume, type of business, and wages do not affect employment. Keywords: SMEs, capital, sales volume, type of business, length of business, wages

scholarly journals Absolute Pitch in Oral Transmission of Folk Tunes as Constrained Random Walks

2015 ◽  
Vol 10 (3) ◽  
pp. 178
Author(s):  
Klaus Frieler
Keyword(s):  
Random Walks ◽  
Empirical Research ◽  
Empirical Data ◽  
Absolute Pitch ◽  
Folk Songs ◽  
Pitch Class ◽  
Oral Transmission

In this commentary, I would like to add a few of our own, still unpublished, empirical observations concerning the possible role of absolute pitch memory (APM) in the oral transmission of folksongs. This empirical data poses some questions on the likelihood of the observed inter-recording tonic pitch consistency of Olthof, Janssen & Honing (2015) and how these could come about. Based on simulations of absolute pitch class of tonics during oral transmission of folk songs, I argue that the interplay of melodic range and vocal range might actually be the main reason for the observed non-uniformity, in contrast to the conclusions presented in Olthof et al. (2015). However, this does not invalidate the therein presented evidence, but makes the case more puzzling, consequently calling for more empirical research on the interaction of melodic and vocal range and latent APM as well as for more detailed modeling of oral transmission of folk songs.

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