Sneak spawning and egg stealing by male threespine sticklebacks

1992 ◽  
Vol 70 (5) ◽  
pp. 963-967 ◽  
Author(s):  
I. G. Jamieson ◽  
P. W. Colgan
Keyword(s):  
Laboratory Study ◽  
Mating Success ◽  
Present Experiment ◽  
Adaptive Significance ◽  
Open Population ◽  
Raiding Behavior ◽  
Threespine Sticklebacks

Nest-raiding behavior by breeding male threespine sticklebacks was examined in a laboratory study to determine the contexts in which spawnings and egg stealing occur, and the effect, if any, of egg stealing on the mating success of the egg stealer. Of three males competing for mates at any one time, those that were last to complete construction of their nest and, subsequently, last to spawn in their own nest, raided most frequently. It was found that raids are initiated primarily during spawning by neighboring males and the majority of incidents of egg stealing are preceded by sneak spawnings. In many cases males steal eggs that they themselves potentially fertilized. However, the stolen eggs do not increase the chances of a male attracting a female to his nest to spawn. Stealing eggs may affect mating success in an open population, but under the conditions of the present experiment the adaptive significance of egg stealing remains unclear.

ADAPTIVE SIGNIFICANCE OF DENSITY-DEPENDENT BALLOONING BY BAGWORM LARVAE, METISA PLANA (WALKER) (LEPIDOPTERA: PSYCHIDAE)

1997 ◽  
Vol 129 (5) ◽  
pp. 927-931 ◽  
Author(s):  
Marc Rhainds ◽  
Gerhard Gries ◽  
Poh Son Chew
Keyword(s):  
Mating Success ◽  
Elaeis Guineensis ◽  
Adaptive Significance ◽  
Density Dependent ◽  
Large Size ◽  
Oil Palms

AbstractExperiments conducted in a plantation of oil palms, Elaeis guineensis (Jacquin), infested with bagworms, Metisa plana (Walker), tested the hypotheses that crowding enhances the incidence of larval ballooning and negatively affects the size attained by pupae. Proportions of ballooning larvae increased with increasing densities of larvae per palm. The lengths of bags (and pupal cases) decreased with increasing numbers of bagworms per leaf. Ballooning of larvae from crowded palms is likely adaptive because individuals attaining large size at pupation have proportionately greatest survival, mating success, and fecundity.

Examining the Effect of Message Style in Esteem Support Interactions: A Laboratory Investigation*

2021 ◽  
Vol 71 (2) ◽  
pp. 220-245
Author(s):  
Amanda J Holmstrom ◽  
Reed M Reynolds ◽  
Samantha J Shebib ◽  
Travis L Poland ◽  
Morgan E Summers ◽  
...  
Keyword(s):  
Laboratory Investigation ◽  
Laboratory Study ◽  
Present Experiment ◽  
Self Esteem ◽  
Face To Face ◽  
Inductive Dimension

Abstract The cognitive–emotional theory of esteem support messages predicts that message style will affect the outcomes of esteem support interactions. However, little research has focused on the effects of message style; that is, how esteem support messages are delivered. The present experiment addresses this lacuna by manipulating message style in a laboratory study examining face-to-face esteem support interactions. Confederates were trained to provide emotion-focused esteem support to naïve participants (N = 173) in four styles along the assertive–inductive dimension, in addition to a listening-only control condition. We then assessed the effect of the interaction on participants’ state self-esteem. Results indicated that emotion-focused esteem support improved state self-esteem more than listening support; however, there was no significant effect of message style. Post-interaction state self-esteem improvement was positively associated with the quantity of emotion-focused esteem support content provided during the interaction.

Laboratory and in-situ analysis of comet dust

1988 ◽  
Vol 46 ◽  
pp. 8-9
Author(s):  
D.E. Brownlee ◽  
A.L. Albee
Keyword(s):  
Electron Microscopy ◽  
Solar System ◽  
Laboratory Study ◽  
Isotopic Analysis ◽  
Building Blocks ◽  
Sem Analysis ◽  
Early Solar System ◽  
Cometary Material ◽  
Comet Dust

Comets are primitive, kilometer-sized bodies that formed in the outer regions of the solar system. Composed of ice and dust, comets are generally believed to be relic building blocks of the outer solar system that have been preserved at cryogenic temperatures since the formation of the Sun and planets. The analysis of cometary material is particularly important because the properties of cometary material provide direct information on the processes and environments that formed and influenced solid matter both in the early solar system and in the interstellar environments that preceded it.The first direct analyses of proven comet dust were made during the Soviet and European spacecraft encounters with Comet Halley in 1986. These missions carried time-of-flight mass spectrometers that measured mass spectra of individual micron and smaller particles. The Halley measurements were semi-quantitative but they showed that comet dust is a complex fine-grained mixture of silicates and organic material. A full understanding of comet dust will require detailed morphological, mineralogical, elemental and isotopic analysis at the finest possible scale. Electron microscopy and related microbeam techniques will play key roles in the analysis. The present and future of electron microscopy of comet samples involves laboratory study of micrometeorites collected in the stratosphere, in-situ SEM analysis of particles collected at a comet and laboratory study of samples collected from a comet and returned to the Earth for detailed study.

When Apologies for Injustice Matter

2008 ◽  
Vol 13 (4) ◽  
pp. 239-247 ◽  
Author(s):  
David De Cremer ◽  
Barbara C. Schouten
Keyword(s):  
Laboratory Study ◽  
Interaction Effect ◽  
Interactive Effect ◽  
Cross Sectional ◽  
Fairness Perceptions ◽  
Organizational Survey ◽  
Experimental Laboratory

The present research examined the idea that the effectiveness of apologies on promoting fairness perceptions depends on how meaningful and sincere the apology is experienced. More precisely, it was predicted that apologies are more effective when they are communicated by an authority being respectful to others. A study using a cross-sectional organizational survey showed that an apology (relative to giving no apology) revealed higher fairness perceptions, but only so when the authority was respectful rather than disrespectful. In a subsequent experimental laboratory study the same interaction effect (as in Study 1) on fairness perceptions was found. In addition, a similar interaction effect also emerged on participants’ self-evaluations in terms of relational appreciation (i.e., feeling valued and likeable). Finally, these self-evaluations accounted (at least partly) for the interactive effect on fairness perceptions.

Sign in / Sign up

Export Citation Format

Share Document