Seed set in Phormium: interactive effects of pollinator behaviour, pollen carryover and pollen source

Oecologia ◽  
1989 ◽  
Vol 81 (1) ◽  
pp. 1-5 ◽  
Author(s):  
John L. Craig
Keyword(s):  
Seed Set ◽  
Interactive Effects ◽  
Pollinator Behaviour ◽  
Pollen Carryover

Pollination biology of Syngonanthus elegans (Eriocaulaceae - Poales)

2009 ◽  
Vol 57 (2) ◽  
pp. 94 ◽  
Author(s):  
Aline Oriani ◽  
Paulo T. Sano ◽  
Vera L. Scatena
Keyword(s):  
Seed Set ◽  
Germination Percentage ◽  
Pollination Biology ◽  
Floral Resources ◽  
Minor Role ◽  
Seedling Vigour ◽  
Pollinator Behaviour ◽  
System A ◽  
Self Pollination ◽  
A Minor

Studies on the pollination biology of Eriocaulaceae are scarce although particularly interesting because of its inclusion in the Poales, a predominantly wind-pollinated order. The pollination biology of Syngonanthus elegans (Bong.) Ruhland was studied during two annual flowering periods to test the hypothesis that insect pollination was its primary pollination system. A field study was carried out, including observations of the morphology and biology of the flowers, insect visits and pollinator behaviour. We also evaluated seed set, seed germination and seedling development for different pollination modes. Although seeds were produced by self-pollination, pollination by small insects contributed most effectively to the reproductive success of S. elegans, resulting in the greatest seed set, with the highest germination percentage and optimum seedling vigour. The floral resources used by flower visitors were pollen and nectar that was produced by staminate and pistillate flowers. Self-pollination played a minor role and its consequence was inbreeding depression.

Pollinator behaviour, not increased resources, boosts seed set on forest edges in a New Zealand Loranthaceous mistletoe

2003 ◽  
Vol 41 (2) ◽  
pp. 277-286 ◽  
Author(s):  
Benjamin R. Montgomery ◽  
Dave Kelly ◽  
Alastair W. Robertson ◽  
Jenny J. Ladley
Keyword(s):  
New Zealand ◽  
Seed Set ◽  
Forest Edges ◽  
Pollinator Behaviour

Opportunities for geitonogamy in the clonal herb Maianthemum dilatatum

2005 ◽  
Vol 83 (9) ◽  
pp. 1082-1087 ◽  
Author(s):  
Amy S.G. Wilson ◽  
Bart J. van der Kamp ◽  
Carol Ritland
Keyword(s):  
Plant Species ◽  
Seed Set ◽  
Natural Populations ◽  
Clonal Plant ◽  
Spatial Proximity ◽  
Clonal Structure ◽  
Female Reproductive Success ◽  
Pollinator Behaviour ◽  
Diverse Range ◽  
Clonal Morphology

Clonal plant species have a diverse range of morphologies, which influences the spatial proximity of clonemates, which may affect the rate of geitonogamy. This study measured fine-scale clonal structure, pollinator behaviour, and impacts of geitonogamy on seed set in Maianthemum dilatatum (A. Wood) Nels. & J.F. Macbr., a herb with a spreading clonal morphology. Despite having a dispersive habit, on average more than 75% of the 10 nearest flowering neighbours of a ramet were clonemates of that ramet. Pollinators foraged preferentially among near-neighbours, but during bouts, visitors typically visited only two floral ramets, effectively lowering the expected contribution to geitonogamy based on flight distances alone. Experimental hand pollinations, pollinator exclusion, and emasculation treatments provided evidence that geitonogamy attributable to pollen from neighbouring ramets may reduce seed set in natural populations through a mechanism of self-interference. Even in a dispersive clonal plant species such as M. dilatatum, clonemate-level geitonogamy is a likely factor constraining female reproductive success.

Interactive effects of shade and surface orientation on the recruitment of spirorbid polychaetes

2001 ◽  
Vol 26 (1) ◽  
pp. 109-115 ◽  
Author(s):  
R. J. Saunders ◽  
S. D. Connell
Keyword(s):  
Surface Orientation ◽  
Interactive Effects

Investigation of the Effect of Mode and Tempo on Emotional Responses to Music Using EEG Power Asymmetry

2013 ◽  
Vol 27 (3) ◽  
pp. 142-148 ◽  
Author(s):  
Konstantinos Trochidis ◽  
Emmanuel Bigand
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Emotional Responses ◽  
Interactive Effects ◽  
Eeg Activity ◽  
Musical Excerpt ◽  
Major Mode ◽  
Musical Modes ◽  
Slow Tempo ◽  
The Right

The combined interactions of mode and tempo on emotional responses to music were investigated using both self-reports and electroencephalogram (EEG) activity. A musical excerpt was performed in three different modes and tempi. Participants rated the emotional content of the resulting nine stimuli and their EEG activity was recorded. Musical modes influence the valence of emotion with major mode being evaluated happier and more serene, than minor and locrian modes. In EEG frontal activity, major mode was associated with an increased alpha activation in the left hemisphere compared to minor and locrian modes, which, in turn, induced increased activation in the right hemisphere. The tempo modulates the arousal value of emotion with faster tempi associated with stronger feeling of happiness and anger and this effect is associated in EEG with an increase of frontal activation in the left hemisphere. By contrast, slow tempo induced decreased frontal activation in the left hemisphere. Some interactive effects were found between mode and tempo: An increase of tempo modulated the emotion differently depending on the mode of the piece.

Interactive Effects of Acute Suicidal Affective Disturbance and Pain Persistence on Suicide Attempt Frequency and Lethality

Crisis ◽  
2019 ◽  
Vol 40 (6) ◽  
pp. 413-421 ◽  
Author(s):  
Megan L. Rogers ◽  
Thomas E. Joiner
Keyword(s):  
Suicide Attempt ◽  
Suicidal Behavior ◽  
Pain Perception ◽  
Suicide Attempts ◽  
Pain Tolerance ◽  
Self Report ◽  
Interactive Effects ◽  
Physical Pain ◽  
Affective Disturbance ◽  
The Relationship

Abstract. Background: Acute suicidal affective disturbance (ASAD) has been proposed as a suicide-specific entity that confers risk for imminent suicidal behavior. Preliminary evidence suggests that ASAD is associated with suicidal behavior beyond a number of factors; however, no study to date has examined potential moderating variables.  Aims: The present study tested the hypotheses that physical pain persistence would moderate the relationship between ASAD and (1) lifetime suicide attempts and (2) attempt lethality. Method: Students ( N = 167) with a history of suicidality completed self-report measures assessing the lifetime worst-point ASAD episode and the presence of a lifetime suicide attempt, a clinical interview about attempt lethality, and a physical pain tolerance task. Results: Physical pain persistence was a significant moderator of the association between ASAD and lifetime suicide attempts ( B = 0.00001, SE = 0.000004, p = .032), such that the relationship between ASAD and suicide attempts strengthened at increasing levels of pain persistence. The interaction between ASAD and pain persistence in relation to attempt lethality was nonsignificant ( B = 0.000004, SE = 0.00001, p = .765). Limitations: This study included a cross-sectional/retrospective analysis of worst-point ASAD symptoms, current physical pain perception, and lifetime suicide attempts. Conclusion: ASAD may confer risk for suicidal behavior most strongly at higher levels of pain persistence, whereas ASAD and pain perception do not influence attempt lethality.

Parenting Behaviors and Anxiety in Young Adults

2015 ◽  
Vol 36 (3) ◽  
pp. 170-176 ◽  
Author(s):  
Erin N. Stevens ◽  
Joseph R. Bardeen ◽  
Kyle W. Murdock
Keyword(s):  
Effortful Control ◽  
Parenting Behaviors ◽  
Protective Role ◽  
Anxiety Symptoms ◽  
Interactive Effects ◽  
Parental Overprotection ◽  
High Control ◽  
Development Of Anxiety ◽  
The Relationship

Parenting behaviors – specifically behaviors characterized by high control, intrusiveness, rejection, and overprotection – and effortful control have each been implicated in the development of anxiety pathology. However, little research has examined the protective role of effortful control in the relation between parenting and anxiety symptoms, specifically among adults. Thus, we sought to explore the unique and interactive effects of parenting and effortful control on anxiety among adults (N = 162). Results suggest that effortful control uniquely contributes to anxiety symptoms above and beyond that of any parenting behavior. Furthermore, effortful control acted as a moderator of the relationship between parental overprotection and anxiety, such that overprotection is associated with anxiety only in individuals with lower levels of effortful control. Implications for potential prevention and intervention efforts which specifically target effortful control are discussed. These findings underscore the importance of considering individual differences in self-regulatory abilities when examining associations between putative early-life risk factors, such as parenting, and anxiety symptoms.

Differences in the Way to Conceive Happiness Relate to Different Reactions to Negative Events

2018 ◽  
Vol 39 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Giulia Fuochi ◽  
Chiara A. Veneziani ◽  
Alberto Voci
Keyword(s):  
Positive Emotions ◽  
Satisfaction With Life ◽  
Well Being ◽  
Protective Role ◽  
Stressful Events ◽  
Interactive Effects ◽  
Negative Events ◽  
Orientations To Happiness ◽  
Specific Reactions ◽  
The Way

Abstract. This paper aimed to assess whether differences in the way to conceive happiness, measured by the Orientations to Happiness measure, were associated with specific reactions to negative events. We hypothesized that among orientations to pleasure (portraying hedonism), to meaning (representing a eudaimonic approach to life), and to engagement (derived from the experience of flow), orientation to meaning would have displayed a stronger protective role against recent negative and potentially stressful events. After providing a validation of the Italian version of the Orientations to Happiness measure (Study 1), we performed regression analyses of the three orientations on positive and negative emotions linked to a self-relevant negative event (Study 2), and moderation analyses assessing the interactive effects of orientations to happiness and stressful events on well-being indicators (Study 3). Our findings supported the hypotheses. In Study 2, meaning was associated with positive emotions characterized by a lower activation (contentment and interest) compared to the positive emotions associated with pleasure (amusement, eagerness, and happiness). In Study 3, only meaning buffered the effect of recent potentially stressful events on satisfaction with life and positive affect. Results suggest that orientation to meaning might help individuals to better react to negative events.

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