scholarly journals Comparative Analysis of Fecundity in Related Amphimictic Aporrectodea сaliginosa and Apomictic A. trapezoides Earthworms, and the Problem of Reproductive Advantages of Parthenogenetic Animals

Zoodiversity ◽  
2020 ◽  
Vol 54 (6) ◽  
pp. 479-486
Author(s):  
Mezhzherin ◽  
Chayka ◽  
Kokodiy ◽  
Tsyba
Keyword(s):  
Comparative Analysis ◽  
Reproductive Potential ◽  
Aporrectodea Caliginosa ◽  
Same Sex ◽  
Animal Groups ◽  
Parthenogenetic Species ◽  
Parthenogenetic Reproduction ◽  
The Individual ◽  
Universal Rule ◽  
Individual Fecundity

The comparative analysis of fecundity and fertility was studied experimentally for the amphimictic Aporrectodea caliginosa diploid earthworms and the close parthenogenetic A. trapezoides triploid earthworms during two seasons. The individual fecundity of cocoons at is significantly higher in the parthenogenetic species than in amphimictic one. Fertility is in contrast lower in the parthenogenetic species, which results in leveled parameters of the reproductive potential. A generalization and analysis of the available data on the comparative fecundity of representatives of different animal groups shows that the automatic increase in fecundity in same-sex organisms due to the exclusion of males cannot be considered a universal rule providing biological progress and the ecological advantage of parthenogenetic organisms. This explanation is not suitable for hermaphroditic organisms. In addition, in some cases, parthenogenetic reproduction is accompanied by reduced fertility and even reduced fecundity.

Impact of the divorce experience on the marital and family mindsets

2018 ◽  
pp. 88-96
Author(s):  
Елена Лактюхина ◽  
Elena Laktyukhina ◽  
Георгий Антонов ◽  
Georgy Antonov
Keyword(s):  
Comparative Analysis ◽  
Demographic Characteristics ◽  
Representative Sampling ◽  
First Marriage ◽  
Active Population ◽  
Volgograd Region ◽  
The Social ◽  
Marriage Stability ◽  
Main Factors ◽  
The Individual

The article presents a comparative analysis of marital and family mindsets of two categories of the demographically active population of modern Russia: (1) individuals that have no experience of a divorce and (2) those who have already experienced one or more official termination of a marriage. The empirical base of the analysis is the data of the author’s questionnaire survey conducted by representative sampling in Volgograd and Volgograd Region in 2015–2016. The analysis was made on the following basic empiric indicators: optimal (from the viewpoint of the respondents) age for the first marriage, frequency of mentioning marital and family statuses as the respondents describe their own social and demographic “portrait”, legitimate causes of a divorce and a number of others. It is found that, in the case of sufficiently strong traditional marital and family mindsets, perception of marital norms is adjusted, if an “abnormal” event (such as a divorce) occurs in the individual’s life course. At the same time, perception of the marriage stability is less variable and does not depend on the social and demographic characteristics of the respondents, including the presence/absence of a marriage termination experience. The “strongest” factor that affects the change of the marital and family mindsets is age. With age (and, consequently, experience accumulation), importance of the majority of main factors capable of preventing the individual from a divorce decreases and, therefore, the risk of such event increases.

scholarly journals Research on the Relationship between Shared Leadership and Individual Creativity-Qualitative Comparative Analysis on the Basis of Clear Set

2021 ◽  
Vol 13 (10) ◽  
pp. 5445
Author(s):  
Muyun Sun ◽  
Jigan Wang ◽  
Ting Wen
Keyword(s):  
Comparative Analysis ◽  
Environmental Factors ◽  
Shared Leadership ◽  
Management Practices ◽  
Qualitative Comparative Analysis ◽  
Necessary Condition ◽  
The Individual ◽  
The Impact ◽  
The Relationship ◽  
Sufficient And Necessary Condition

Creativity is the key to obtaining and maintaining competitiveness of modern organizations, and it has attracted much attention from academic circles and management practices. Shared leadership is believed to effectively influence team output. However, research on the impact of individual creativity is still in its infancy. This study adopts the qualitative comparative analysis method, taking 1584 individuals as the research objects, underpinned by a questionnaire-based survey. It investigates the influence of the team’s shared leadership network elements and organizational environmental factors on the individual creativity. We have found that there are six combination of conditions of shared leadership and organizational environmental factors constituting sufficient combination of conditions to increase or decrease individual creativity. Moreover, we have noticed that the low network density of shared leadership is a sufficient and necessary condition of reducing individual creativity. Our results also provide management suggestions for practical activities during the team management.

scholarly journals Dominance relationships and coalitionary aggression against conspecifics in female carrion crows

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Benedikt Holtmann ◽  
Julia Buskas ◽  
Matthew Steele ◽  
Kristaps Solokovskis ◽  
Jochen B. W. Wolf
Keyword(s):  
Social Interactions ◽  
Social Environment ◽  
Social Rank ◽  
Social Benefits ◽  
Same Sex ◽  
The Third ◽  
Dominance Relationships ◽  
Dominant Individual ◽  
The Individual

Abstract Cooperation is a prevailing feature of many animal systems. Coalitionary aggression, where a group of individuals engages in coordinated behaviour to the detriment of conspecific targets, is a form of cooperation involving complex social interactions. To date, evidence has been dominated by studies in humans and other primates with a clear bias towards studies of male-male coalitions. We here characterize coalitionary aggression behaviour in a group of female carrion crows consisting of recruitment, coordinated chase, and attack. The individual of highest social rank liaised with the second most dominant individual to engage in coordinated chase and attack of a lower ranked crow on several occasions. Despite active intervention by the third most highly ranked individual opposing the offenders, the attack finally resulted in the death of the victim. All individuals were unrelated, of the same sex, and naïve to the behaviour excluding kinship, reproduction, and social learning as possible drivers. Instead, the coalition may reflect a strategy of the dominant individual to secure long-term social benefits. Overall, the study provides evidence that members of the crow family engage in coordinated alliances directed against conspecifics as a possible means to manipulate their social environment.

scholarly journals Fishery-induced changes in Norwegian red king crab (Paralithodes camtschaticus) reproductive potential

2013 ◽  
Vol 71 (2) ◽  
pp. 365-373 ◽  
Author(s):  
Ann Merete Hjelset
Keyword(s):  
Egg Production ◽  
Barents Sea ◽  
Reproductive Potential ◽  
Size Composition ◽  
Red King Crab ◽  
Paralithodes Camtschaticus ◽  
King Crab ◽  
Males And Females ◽  
Induced Changes ◽  
Individual Fecundity

Abstract Hjelset, A. M. 2014. Fishery-induced changes in Norwegian red king crab (Paralithodes camtschaticus) reproductive potential. – ICES Journal of Marine Science, 71: 365–373. The introduced red king crab (Paralithodes camtschaticus) in the Barents Sea supports a valuable fishery in northern Norway. In this paper, I examine the effect of the increased harvest rate and the recently added female quota on the potential egg production of the stock. The size ranges of males and females in the period 1995–2011 were recorded, and estimated stock abundance of ovigerous females and established individual fecundity parameters from 2000–2007 were used to assess the reproductive potential of the stock from 1995–2011. The upper size ranges of males and females decreased throughout the period studied, presumably mainly due to fishing. The change in size composition among ovigerous females and functional mature males, and the reduced mean individual fecundity in the stock seem to have had a negative effect on the potential egg production of the stock.

scholarly journals Acceptance threshold theory can explain occurrence of homosexual behaviour

2015 ◽  
Vol 11 (1) ◽  
pp. 20140603 ◽  
Author(s):  
Katharina C. Engel ◽  
Lisa Männer ◽  
Manfred Ayasse ◽  
Sandra Steiger
Keyword(s):  
Animal Species ◽  
Reproductive Potential ◽  
Search Time ◽  
Same Sex ◽  
Burying Beetles ◽  
Acceptance Threshold ◽  
Threshold Theory ◽  
Wide Range ◽  
Low Levels ◽  
Perceived Costs

Same-sex sexual behaviour (SSB) has been documented in a wide range of animals, but its evolutionary causes are not well understood. Here, we investigated SSB in the light of Reeve's acceptance threshold theory. When recognition is not error-proof, the acceptance threshold used by males to recognize potential mating partners should be flexibly adjusted to maximize the fitness pay-off between the costs of erroneously accepting males and the benefits of accepting females. By manipulating male burying beetles' search time for females and their reproductive potential, we influenced their perceived costs of making an acceptance or rejection error. As predicted, when the costs of rejecting females increased, males exhibited more permissive discrimination decisions and showed high levels of SSB; when the costs of accepting males increased, males were more restrictive and showed low levels of SSB. Our results support the idea that in animal species, in which the recognition cues of females and males overlap to a certain degree, SSB is a consequence of an adaptive discrimination strategy to avoid the costs of making rejection errors.

Volkswille: Reale Substanz oder notwendige Fiktion?

Der Staat ◽  
2020 ◽  
Vol 59 (3) ◽  
pp. 371-396
Author(s):  
Shu-Perng Hwang
Keyword(s):  
Comparative Analysis ◽  
Right Wing ◽  
The Real ◽  
The People ◽  
The Will ◽  
Right Wing Populism ◽  
The Individual

Angesichts des markanten Aufstiegs des Rechtspopulismus in den vergangenen Jahren drängt sich die Frage immer wieder auf, ob oder inwiefern das Parlament den eigentlichen Volkswillen (noch) vertreten kann, und wie im Zeitalter der Globalisierung und Digitalisierung der eigentliche Volkswille überhaupt festzustellen und effektiv durchzusetzen ist. In dieser Hinsicht steht das Vertrauen in die Fähigkeit des Parlaments, den wahren Volkswillen herauszubilden und zu artikulieren, erneut vor großen Herausforderungen. Durch eine vergleichende Analyse zwischen den Demokratietheorien Böckenfördes und Kelsens zeigt der vorliegende Beitrag, weshalb und inwiefern das weitverbreitete Verständnis des Volkswillens und dessen Rolle in der parlamentarischen Demokratie gerade vor dem heutigen Hintergrund eine kritische Besinnung verdient. Es wird argumentiert, dass gerade in demokratischer Hinsicht nicht die Suche nach dem „wahren Volkswillen“, sondern nach wie vor die Gewährleistung der Menschen- bzw. Grundrechte der Einzelnen und insbesondere der Minderheiten von zentraler Bedeutung sein soll. In view of the spread of right-wing populism in recent years, the question as to how the will of the people is to be ascertained and expressed has attracted much attention in constitutional scholarship. In particular, the issue of whether or to what extent the parliament is (still) capable of representing and demonstrating the will of the people has been repeatedly discussed and debated. Through a comparative analysis of Böckenförde’s und Kelsen’s democratic theories, this article critically examines the problems of the widespread understanding of the will of the people as a real-empirical existence and its significance for the realization of democracy. Accordingly, it points out why and in what sense the reference to the so-called real will of the people would undermine rather than promote democracy. This article concludes by arguing that, precisely for the sake of democracy, what is crucial is not to determine what the “real will of the people” is, but rather to guarantee the freedom of the individual and especially of the minorities.

PRINCIPLES AND GUIDELINES FOR THE IMPLEMENTATION OF BIOECONOMY STRATEGIES

2020 ◽  
Vol 18 (Suppl.1) ◽  
pp. 473-479
Author(s):  
P. Branzova
Keyword(s):  
Comparative Analysis ◽  
The Individual

The report examines existing bioeconomy strategies. The principles and guidelines of the individual countries for the implementation of the strategies are considered. A comparative analysis of the strategies was made. Based on this, the principles and guidelines for the implementation of the strategies for the bioeconomy of individual countries are derived.

scholarly journals Attitude of Indian Youth towards Homosexuality

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Sahni S ◽  
Gupta B ◽  
Nodiyal K ◽  
Pant V
Keyword(s):  
Comparative Analysis ◽  
Graduate Students ◽  
Implicit Association Test ◽  
Positive Attitude ◽  
Contact Hypothesis ◽  
Implicit Attitude ◽  
Implicit Association ◽  
Same Sex ◽  
Interpersonal Contact ◽  
Contact Group

Homosexualism is behaviour or a phenomenon in which individuals of the same sex are attracted to or have sexual relations with each other. In India, homosexuality is a taboo subject. Much research has not been conducted to understand the attitude of Indian youth towards homosexuality. The aim of the present research was to measure the implicit attitude, and a comparative analysis between the contact group (those who are in contact with homosexual individuals) and the non-contact group (those who neither know nor are in touch with homosexual individuals) was conducted. Implicit Association Test (Greenwald, McGhee, Schwartz, 1998) was used to gauge the implicit attitude towards homosexual individuals. 100 (50 males and 50 females) undergraduate and graduate students of Delhi and NCR were taken as sample in the study. It has been highlighted through various studies that people might show a positive or a neutral attitude towards homosexuality but unconsciously it may not always be the case. The contact hypothesis (Allport, 1954) suggests that the prejudice against homosexuals can be mitigated by encouraging interpersonal contact between non-homosexual and homosexual population. The findings of this study suggests that the contact group held a positive attitude towards homosexuals (30 out of 50), while the non-contact group held a negative one (40 out of 50).

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