Search results for "Dominance"

2D:4D in Men Is Related to Aggressive Dominance but Not to Sociable Dominance

2012

It has been shown that a smaller ratio between the length of the second and fourth digit (2D:4D) is an indicator of the exposure to prenatal testosterone (T). This study measured the 2D:4D of men and assessed dominance as a personality trait to investigate indirectly if the exposure to prenatal T is related to a dominant personality later in life. Results showed that men had a more aggressive dominant personality when having a more masculine (lower) 2D:4D, while there was no relationship between sociable dominance and 2D:4D. Findings from this study indicate that it is important to distinguish different forms of dominance since other studies failed to find relationships between dominance an…

¿Puede ser ecológico el estilo moderno de vida?

2019

Se trata de responder a la pregunta sobre la posibilidad de un estilo de vida ecológico en las condiciones de la vida moderna; es decir, teniendo en cuenta la condición técnica y económica del hombre, la tecnologización de la sociedad, la nueva cultura económica basada en el crecimiento económico, la ilimitada producción y el imperio del consumo. Como vía de solución se propone una ética universal de la responsabilidad solidaria para un ethos ecológico, capaz de superar el habitual dilema entre los valores del biocentrismo y del humanismo.

Extensions and intentions in the rough set theory

1998

Abstract The approach to rough set theory proposed in this paper is based on the mutual correspondence of the concepts of extension and intension. It is different from the well-known approaches in the literature in that the upper approximations and the lower approximations of ‘unknown’ sets are considered as certain families of ‘known’ sets. This approach makes it possible to formulate necessary and sufficient conditions for the existence of operations on rough sets, which are analogous to classical operations on sets. The basic results presented in this paper, based on certain ideas of the second author, were formulated by the first author in his doctoral dissertation prepared under the su…

On the boundary spectrum of dominatedC o-Semigroups

1989

Community Structure of Gastropods in Seagrass Meadows at Coastal Area of Nusi and Gersen, Nabire Regency

2020

Gastropods plays an important role in the food chain on seagrass ecosystem and its existence are depend on the physical-chemical factors in the seagrass ecosystem. This study aims to determine the density and diversity of gastropods associated in seagrass habitat in Nusi and Gersen coastal waters. The measurement results of some physical-chemical waters variables, are still quite good for the life of gastropods. Species composition of gastropod in Nusi at higher than at the Gersen, but instead of individual density in Gersen more higher than Nusi. Diversity index of gastropods at Nusi station is higher (3,757) than Gersen (3.053), on the contrary the eveness and dominance index are higher a…

Asymmetric behaviour of biotechnology business patterns in Spain

2009

Since the end of the 90s there has been an increase in the emergence of biotechnology industries in Spain, partially as a result of growing support from institutionally based infrastructures. Through the use of empirical fieldwork, this study aims to reveal how future prospects are not as optimistic as most Spanish agents perceive. Our conclusions are based on the asymmetric behaviour shown by Spanish biotechnology firms in their business models. This asymmetry is based on the overwhelming dominance of business models centred on low investment, limited R&D expenditure and minor or incremental innovation, whereas the long term–long return model, which prevails in the leading countries in thi…

The chemistry of competition: exploitation of heterospecific cues depends on the dominance rank in the community

2014

Interspecific competition is an important ecological mechanism shaping the traits of the interacting species and structuring their communities. Less competitive species benefit from evading direct encounters with aggressive dominants, whereas dominant species could use cues left by subordinates to steal their resources or to chase them off. Here, we studied competitive interactions among five common and syntopic ant species in Central Europe (Formica polyctena, Formica rufibarbis, Lasius niger, Myrmica rubra and Tetramorium caespitum) and investigated their ability to react to heterospecific chemical cues. Using aggression assays, we established a clear dominance hierarchy of these species,…

Attacks of songbirds in mixed‐species flocks by Eurasian Sparrowhawks: strategies of predators and potential prey

2020

Black Grouse leks on ice: Female mate sampling by incitation of male competition?

1995

Male-male competition is assumed to limit female choice of mates, but it may also help females to choose the most vigorous males. We studied the mate sampling behaviour of female black grouse (Tetrao tetrix) at spatially unstable leks on ice-covered lakes. In the absence of territories and site-dependence in outcomes of fights, the male dominance hierarchy is very evident on ice. When being courted by dominant males, females frequently tried to approach other males. This was frequently prevented because (1) the courting male and the approached male were involved in physical fight, or (2) the dominant male followed the female and the approached male escaped and avoided contact with him. Thes…

The red tooth hypothesis: A computational model of predator-prey relations, protean escape behavior and sexual reproduction

2009

This paper presents an extension of the Red Queen Hypothesis (hereafter, RQH) that we call the Red Tooth Hypothesis (RTH). This hypothesis suggests that predator-prey relations may play a role in the maintenance of sexual reproduction in many higher animals. RTH is based on an interaction between learning on the part of predators and evolution on the part of prey. We present a simple predator-prey computer simulation that illustrates the effects of this interaction. This simulation suggests that the optimal escape strategy from the prey's standpoint would be to have a small number of highly reflexive, largely innate (and, therefore, very fast) escape patterns, but that would also be unlearn…