The role of linear mown firebreaks in conserving butterfly diversity: Effects of adjacent vegetation and management

2017 ◽  
Vol 21 (1) ◽  
pp. 112-123 ◽  
Author(s):  
Atsushi Ohwaki ◽  
Sho-ichi Hayami ◽  
Masahiko Kitahara ◽  
Taisuke Yasuda
2021 ◽  
Author(s):  
Vít Latzel ◽  
Javier Puy ◽  
Michael Thieme ◽  
Etienne Bucher ◽  
Lars Götzenberger ◽  
...  

AbstractAn accumulating body of evidence indicates that natural plant populations harbour a large diversity of transposable elements (TEs). TEs provide genetic and epigenetic variation that can substantially translate into changes in plant phenotypes. Despite the wealth of data on the ecological and evolutionary effects of TEs on plant individuals, we have virtually no information on the role of TEs on populations and ecosystem functioning. On the example of Arabidopsis thaliana, we demonstrate that TE-generated variation creates differentiation in ecologically important functional traits. In particular, we show that Arabidopsis populations with increasing diversity of individuals differing in copy numbers of the ONSEN retrotransposon had higher phenotypic and functional diversity. Moreover, increased diversity enhanced population productivity and reduced performance of interspecific competitors. We conclude that TE-generated diversity can have similar effects on ecosystem as usually documented for other biological diversity effects.


2019 ◽  
Vol 433 ◽  
pp. 287-294 ◽  
Author(s):  
Bastien Castagneyrol ◽  
Brice Giffard ◽  
Elena Valdés-Correcher ◽  
Arndt Hampe

Urban Studies ◽  
2014 ◽  
Vol 52 (5) ◽  
pp. 984-990
Author(s):  
Agata Górny ◽  
Sabina Toruńczyk-Ruiz

In a 2014 paper, we demonstrated that the negative relationship between ethnic diversity and neighbourhood attachment was moderated by interethnic ties differently for migrants and natives living in ethnically diverse neighbourhoods. In this article, we respond to the Comment on our paper by Oded Stark, who proposes to interpret our findings within the framework of relative deprivation theory, and to explain the different results for migrants and natives by different preferences for diversity and resulting self-selection processes among the two groups. We argue that explaining the negative link between ethnic diversity and neighbourhood attachment by a distaste for relative deprivation is problematic given the intricacies of relationships between ethnic diversity, economic diversity, economic inequality and neighbourhood attachment. We note that employing the concept of relative deprivation in the analyses of ethnic diversity effects should acknowledge the role that interethnic ties play in the way natives and migrants define their reference groups. We also claim that preferences for diversity are unlikely to constitute a substantial basis for residential selection among migrants and natives, given the role of structural and socio-psychological factors in residential choices.


Author(s):  
Birga M. Schumpe ◽  
Jocelyn J. Bélanger ◽  
Claudia F. Nisa ◽  
Antonio Pierro

AbstractThis paper makes a case for explaining diversity effects through cognitive factors as compared to demographic or other differences in backgrounds. We argue that studying perceived diversity in conjunction with diversity beliefs can explain positive and negative effects through a motivated opening or closing of the mind (Need for Cognitive Closure, NFCC). NFCC is the motivation to avoid uncertainty and ambiguity. In Study 1, we experimentally demonstrate that asking participants to think about differences among their coworkers increases their NFCC. Study 2 shows that greater uncertainty about social norms in the workplace is positively related to NFCC. Study 3 confirms the mediating role of NFCC in explaining divergent thinking attitudes in expatriates working in various multicultural cities around the world. Study 4 demonstrates that perceived diversity is positively associated with NFCC when people hold negative beliefs about diversity, whereas positive beliefs mitigate this effect. Lastly, Study 5 shows that the interaction between perceived diversity and diversity beliefs is further moderated by task type. Taken together, the present research highlights the importance of studying cognitive factors to explain diversity effects.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Antoine Gardarin ◽  
Justine Pigot ◽  
Muriel Valantin-Morison

AbstractPlant taxonomic and functional diversity promotes interactions at higher trophic levels, but the contribution of functional diversity effects to multitrophic interactions and ecosystem functioning remains unclear. We investigated this relationship in a factorial field experiment comparing the effect of contrasting plant communities on parasitism rates in five herbivore species. We used a mechanistic trait-matching approach between plant and parasitoids to determine the amount of nectar available and accessible to parasitoids. This trait-matching approach best explained the rates of parasitism of each herbivorous species, confirming the predominant role of mass-ratio effects. We found evidence for an effect of functional diversity only in analyses considering the ability of plant communities to support the parasitism of all herbivores simultaneously. Multi-species parasitism was maximal at intermediate levels of functional diversity. Plant specific richness had a negligible influence relative to functional metrics. Plant communities providing large amounts of accessible nectar and with intermediate levels of functional diversity were found to be the most likely to enhance the conservation biological control of diverse crop herbivores.


Author(s):  
Iris Glas ◽  
Roel Jennissen ◽  
Godfried Engbersen

AbstractThis study considers and simultaneously tests the role of ethnic diversity and out-group size in relation to individuals’ perceptions of neighborhood cohesion and fear of crime among natives in Dutch neighborhoods. We challenge the way the impact of diversity has been studied previously and propose an alternative measure to examine diversity effects. This results in a better understanding of how and why the ethnic composition of a neighborhood may impact levels of cohesion and fear, and thereby contributes to the literature on the societal effects of ethnic diversity. In addition, attention is paid to the association between cohesion and fear and whether neighborhood cohesion mediates the relationship between ethnic diversity and fear of crime. We apply multilevel equation modeling techniques to analyze the different relationships and use data of the Dutch Safety Monitor (N = 71,760) in combination with detailed register data. Our study is one of the first to detect a diversity effect on cohesion based on the modified diversity measure. We do not find support for the hypothesized diversity effect on fear of crime. Lastly, out-group size turned out to decrease cohesion and increase fear.


2010 ◽  
Vol 3 (2) ◽  
pp. 109-121 ◽  
Author(s):  
Norma Nitschke ◽  
Anne Ebeling ◽  
Tanja Rottstock ◽  
Christoph Scherber ◽  
Cornelius Middelhoff ◽  
...  

2021 ◽  
pp. 104649642110450
Author(s):  
Astrid C. Homan ◽  
Gerben A. van Kleef

Team members may vary in the degree to which they are self-motivating, diligent, and organized, but effects of such conscientiousness diversity are poorly understood. We propose that conscientiousness diversity effects depend on the team leader’s knowledge about managing negative affective responses—that is emotion regulation knowledge. Data of two time-lagged team studies show that for teams with leaders with lower emotion-regulation knowledge, conscientiousness diversity was negatively associated with team satisfaction (Study 1 and 2), team cohesion and information elaboration (Study 2), which in turn influenced team performance (Study 2). These negative relationships reversed in teams with leaders with higher emotion-regulation knowledge.


JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  

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