scholarly journals Dispersal has inhibited avian diversification in Australasian archipelagoes

2014 ◽  
Vol 281 (1791) ◽  
pp. 20141257 ◽  
Author(s):  
Brian C. Weeks ◽  
Santiago Claramunt
Keyword(s):  
Range Expansion ◽  
Diversification Rate ◽  
Dispersal Ability ◽  
Wing Morphology ◽  
Diversification Rates ◽  
Positive Effects ◽  
Event Models ◽  
Avian Diversification ◽  
Founder Event ◽  
The Relationship

Different models of speciation predict contrasting patterns in the relationship between the dispersal ability of lineages and their diversification rates. This relationship is expected to be negative in isolation-limited models and positive in founder-event models. In addition, the combination of negative and positive effects of dispersal on speciation can result in higher diversification rates at intermediate levels of dispersal ability. Using molecular phylogenies to estimate diversification rates, and wing morphology to estimate dispersal ability, we analysed the influence of dispersal on diversification in the avifauna of Australasian archipelagoes. Contrary to expectations given the fragmented nature of island systems, the relationship between dispersal ability and diversification rate was monotonically negative. While multiple mechanisms could generate this pattern, they all share a phase of range expansion that is decoupled from speciation.

scholarly journals Cross-taxa generalities in the relationship between population abundance and ambient temperatures

2017 ◽  
Vol 284 (1863) ◽  
pp. 20170870 ◽  
Author(s):  
Diana E. Bowler ◽  
Peter Haase ◽  
Christian Hof ◽  
Ingrid Kröncke ◽  
Léon Baert ◽  
...  
Keyword(s):  
Climate Change ◽  
Central Europe ◽  
Time Series Data ◽  
Interspecific Variation ◽  
Series Data ◽  
Dispersal Ability ◽  
Aquatic Communities ◽  
Positive Effects ◽  
Effects Of Temperature ◽  
The Relationship

Identifying patterns in the effects of temperature on species' population abundances could help develop a general framework for predicting the consequences of climate change across different communities and realms. We used long-term population time series data from terrestrial, freshwater, and marine species communities within central Europe to compare the effects of temperature on abundance across a broad range of taxonomic groups. We asked whether there was an average relationship between temperatures in different seasons and annual abundances of species in a community, and whether species attributes (temperature range of distribution, range size, habitat breadth, dispersal ability, body size, and lifespan) explained interspecific variation in the relationship between temperature and abundance. We found that, on average, warmer winter temperatures were associated with greater abundances in terrestrial communities (ground beetles, spiders, and birds) but not always in aquatic communities (freshwater and marine invertebrates and fish). The abundances of species with large geographical ranges, larger body sizes, and longer lifespans tended to be less related to temperature. Our results suggest that climate change may have, in general, positive effects on species’ abundances within many terrestrial communities in central Europe while the effects are less predictable in aquatic communities.

scholarly journals The influence of wing morphology upon the dispersal, geographical distributions and diversification of the Corvides (Aves; Passeriformes)

2016 ◽  
Vol 283 (1844) ◽  
pp. 20161922 ◽  
Author(s):  
Jonathan D. Kennedy ◽  
Michael K. Borregaard ◽  
Knud A. Jønsson ◽  
Petter Z. Marki ◽  
Jon Fjeldså ◽  
...  
Keyword(s):  
Habitat Preferences ◽  
Global Radiation ◽  
Dispersal Ability ◽  
Wing Morphology ◽  
Wing Form ◽  
Long Distance ◽  
Widespread Species ◽  
Diversification Rates ◽  
Sparse Vegetation ◽  
Dispersal Abilities

New species are sometimes known to arise as a consequence of the dispersal and establishment of populations in new areas. It has nevertheless been difficult to demonstrate an empirical link between rates of dispersal and diversification, partly because dispersal abilities are challenging to quantify. Here, using wing morphology as a proxy for dispersal ability, we assess this relationship among the global radiation of corvoid birds. We found that species distributions are associated with wing shape. Widespread species (occurring on both islands and continents), and those that are migratory, exhibit wing morphologies better adapted to long-distance flight compared with sedentary continental or insular forms. Habitat preferences also strongly predict wing form, with species that occur in canopies and/or areas of sparse vegetation possessing dispersive morphologies. By contrast, we found no significant differences in diversification rates among either the migratory or habitat classifications, but species distributed in island settings diversify at higher rates than those found on continents. This latter finding may reflect the elevated dispersal capabilities of widespread taxa, facilitating the radiation of these lineages across insular areas. However, as the correlations between wing morphology and diversification rates were consistently weak throughout our dataset, this suggests that historical patterns of diversification are not particularly well reflected by present-day wing morphology.

scholarly journals Fruit colour and range size interact to influence diversification

2021 ◽  
Author(s):  
Adrian Patrik Hill ◽  
Maria Fernanda Torres Jiménez ◽  
Nicolas Chazot ◽  
Cibele Cássia-Silva ◽  
Søren Faurby ◽  
...  
Keyword(s):  
Model Selection ◽  
Large Range ◽  
Fruit Color ◽  
Range Size ◽  
Diversification Rate ◽  
Dispersal Ability ◽  
Fruit Colour ◽  
Dispersal Patterns ◽  
Intermediate Range ◽  
The Relationship

Aim: Different fruit colours are associated with dispersal by different frugivores, largely based on colour vision type. Frugivore mobility affects overall range size for the plant being dispersed. Here we determine the interaction between different fruit colours, range sizes, and diversification rates by testing two hypotheses: That (1) fruit colours attractive to birds have larger range sizes due to their higher dispersal ability, and that (2) different frugivore disperser groups, bird or mammal, leads to different diversification rate at different range size, where intermediate range size leads to the highest diversification rate. Location: Global. Time period: Contemporary (or present). Major taxa studied: Palms (Arecaceae). Methods: Using model selection, we identified three groups of colours with similar diversification rate and likely disperser. Range sizes were estimated and categorized species as small, intermediate, or large-ranged. For model selection and to determine the relationship beween fruit color, range size and diversification rate we used Multi-State Speciation and Extinction (MuSSE) models. Results: Species with intermediate range size had the highest net diversification for all three fruit colour groups. Bird-dispersed palms more likely diversified at small than at large range size while mammal-dispersed palms more likely diversified at larger range size than small. Fruit colours associated with mammal dispersal had more large-ranged species than colours associated with bird dispersal. Main conclusions: The associated between intermediate range size and higher diversification rate indicates that spatial factors that affect diversification at small and large range sizes result in higher diversification at intermediate ranges. We find striking differences in diversification rate within each range size category between fruit color groups. This suggests that the relationship between diversification rate and range size depends on the specific frugivorous dispersers and their dispersal patterns. This study reveals how fruit traits alter dispersal patterns and how that, in turn, influences diversification.

scholarly journals The Diffusion Mechanism of Megaproject Citizenship Behavior: The Role of Institutional Isomorphism

2021 ◽  
Vol 13 (15) ◽  
pp. 8123
Author(s):  
Delei Yang ◽  
Jun Zhu ◽  
Qingbin Cui ◽  
Qinghua He ◽  
Xian Zheng
Keyword(s):  
Structural Equation ◽  
Diffusion Mechanism ◽  
Vital Role ◽  
Citizenship Behavior ◽  
Equation Modeling ◽  
Positive Effects ◽  
Diffusion Limited ◽  
The Relationship ◽  
Mimetic Isomorphism

Megaproject citizenship behavior (MCB) has been confirmed to a play vital role on megaproject performance. Although current research has argued that institution elements have had an impact on MCB diffusion, limited studies have empirically investigated the distinct effectiveness of various institution elements on driving MCB’s widespread diffusion in construction megaprojects. Based on institution theory, this study proposes a theoretical model comprising institutional elements (i.e., normative and mimetic isomorphism), owner’s support, relationship-based trust, and their effect or impact on MCB’s diffusion. Based on 171 industrial questionnaires collected from managers of contractors and designers in megaprojects. Partial least squares structural equation modeling (PLS-SEM) was used to validate the established model. The results indicated that both normative and mimetic isomorphism have positive effects on facilitating MCB diffusion, and owner’s support has shown partial mediation in promoting MCB diffusion through normative isomorphism, as well as full mediation in the promoting of MCB diffusion through mimetic isomorphism. Meanwhile, relationship-based trust exerts a positive moderating effect on the relationship between mimetic isomorphism and MCB. This study extends current literature on driving MCB diffusion from the perspective of institutional theory, contributing by providing four implications for megaprojects managers to “buy in” more extensive MCB.

A learning organization perspective on knowledge-sharing behavior and firm innovation

2006 ◽  
Vol 25 (4) ◽  
pp. 227-236
Author(s):  
Li-Fen Liao
Keyword(s):  
Knowledge Sharing ◽  
Learning Organization ◽  
Significant Relationship ◽  
Shared Vision ◽  
Firm Innovation ◽  
Positive Effects ◽  
Knowledge Sharing Behavior ◽  
Relationship Of ◽  
The Relationship ◽  
Sharing Behavior

Sharing knowledge and firm innovation are the crucial ways to sustain competitive advantage. This study builds a nested model to test the relationship between learning organization, knowledge-sharing behavior, and firm innovation. Data gathered from 254 employees were used to examine the relationship of the learning organization to employees' knowledge-sharing behavior and firm innovation. The results indicate that open-mindedness, shared vision and trust have positive effects on both knowledge-sharing behavior and firm innovation. While commitment to learning does not shows significant relationship on knowledge-sharing behavior and firm innovation. Communication has significance on firm innovation but not significance on knowledge-sharing behavior.

scholarly journals Sex Dolls in the Swedish Media Discourse: Intimacy, Sexuality, and Technology

2021 ◽  
Author(s):  
Robin Björkas ◽  
Mariah Larsson
Keyword(s):  
Critical Discourse Analysis ◽  
Critical Discourse ◽  
Sexual Practices ◽  
Media Discourse ◽  
Positive Effects ◽  
Therapeutic Uses ◽  
Broad Variety ◽  
The Media ◽  
Definition Of ◽  
The Relationship

AbstractSex dolls are a complex phenomenon with several diverse possible emotional, sexual and therapeutic uses. They can be part of a broad variety of sexual practices, and also function as a sexual aid. However, the media discourse on sex dolls first and foremost concerns how we perceive the relationship between intimacy and technology. A critical discourse analysis of the Swedish media discourse on sex dolls reveals six themes which dominate the discourse: (a) the definition of what a human being is; (b) a discourse on the (technological and existential) future; (c) a social effort; (d) a loveless phenomenon; (e) men’s violence against women; and (f) pedophilia. Accordingly, this discourse is very conservative and normative in its view of sexuality, technology, and humanity. Overall, the dominant themes do not provide any space for positive effects of technology on human sexuality, and if they do, it is usually as a substitute for something else.

scholarly journals How Does Suppliers’ Fairness Affect the Relationship Quality of Agricultural Product Supply Chains?

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Yuling Sun ◽  
Zehua Liu ◽  
Hui Yang
Keyword(s):  
Relationship Quality ◽  
Structural Equation ◽  
Procedural Fairness ◽  
Agricultural Product ◽  
Fairness Perception ◽  
Positive Effects ◽  
Distributive Fairness ◽  
Study Results ◽  
The Impact ◽  
The Relationship

Although many studies have suggested that the relationship between different supply chain members significantly affects agricultural product quality, suppliers’ perceptions of fairness, which greatly influence their decisions on building the relationship quality, are often overlooked. Particularly, the empirical evidence to investigate the impacts of suppliers’ fairness on the relationship quality and the factors that affect the suppliers’ fairness is missing, and therefore this knowledge gap needs to be filled by new research. Herein, we conducted a survey of 450 agricultural product suppliers and systemically analyzed the impact of antecedents on fairness perception and the impact of fairness perception on relationship quality. In addition, we developed a structural equation model and found that information sharing and price satisfaction had significantly positive effects on procedural fairness and distributive fairness, respectively. Furthermore, our studies demonstrated that procedural fairness is more important in improving the relationship quality than distributive fairness. However, supplier dependence is another important impact factor, and it greatly decreases the positive effects of suppliers’ fairness on relationship quality. In summary, the study results provide several managerial implications and extend our understanding of the importance of suppliers’ fairness in the relationship quality, which involves product development with respect to the supplier’s performance.

Exploring privacy and trust for employee monitoring

2015 ◽  
Vol 115 (1) ◽  
pp. 88-106 ◽  
Author(s):  
Shuchih Ernest Chang ◽  
Anne Yenching Liu ◽  
Sungmin Lin
Keyword(s):  
Organizational Culture ◽  
Employee Performance ◽  
Full Time ◽  
Negative Effects ◽  
Content Type ◽  
Positive Effects ◽  
Study Results ◽  
Employee Monitoring ◽  
Communication Privacy ◽  
The Relationship

Purpose – The purpose of this paper is to evaluate privacy boundaries and explores employees’ reactions in employee monitoring. Design/methodology/approach – The research used the metaphor of boundary turbulence in the Communication Privacy Management (CPM) theory to demonstrate the psychological effect on employees. The model comprised organizational culture, CPM, trust, and employee performance in employee monitoring to further investigated the influence exerted by organizational culture and how employees viewed their trust within the organization when implementing employee monitoring. Variables were measured empirically by administrating questionnaires to full-time employees in organizations that currently practice employee monitoring. Findings – The findings showed that a control-oriented organizational culture raised communication privacy turbulence in CPM. The communication privacy turbulence in CPM mostly had negative effects on trust in employee monitoring policy, but not on trust in employee monitoring members. Both trust in employee monitoring policy and trust in employee monitoring members had positive effects on employee commitment and compliance to employee monitoring. Research limitations/implications – This research applied the CPM theory in workplace privacy to explore the relationship between employees’ privacy and trust. The results provide insights of why employees feel psychological resistance when they are forced to accept the practice of employee monitoring. In addition, this study explored the relationship between CPM and trust, and offer support and verification to prior studies. Practical implications – For practitioners, the findings help organizations to improve the performance of their employees and to design a more effective environment for employee monitoring. Originality/value – A research model was proposed to study the impacts of CPM on employee monitoring, after a broad survey on related researches. The validated model and its corresponding study results can be referenced by organization managers and decision makers to make favorable tactics for achieving their goals of implementing employee monitoring.

The optimism-pessimism ratio as predictor of employee creativity: the promise of duality

2018 ◽  
Vol 21 (3) ◽  
pp. 423-442 ◽  
Author(s):  
Arménio Rego ◽  
Miguel Pina e Cunha ◽  
Dálcio Reis Júnior ◽  
Cátia Anastácio ◽  
Moriel Savagnago
Keyword(s):  
Cross Sectional ◽  
Content Type ◽  
Future Studies ◽  
Positive Effects ◽  
The Status ◽  
Single Moment ◽  
Quasi Experimental ◽  
Creativity And Innovation ◽  
The Relationship ◽  
Practical Implications

Purpose The purpose of this paper is to study if the employees’ optimism-pessimism ratio predicts their creativity. Design/methodology/approach In total, 134 employees reported their optimism and pessimism, and the respective supervisors described the employees’ creativity. Findings The relationship between the optimism-pessimism ratio and creativity is curvilinear (inverted U-shaped); beyond a certain level of the optimism-pessimism ratio, the positive relationship between the ratio and creativity weakens, suggesting that the possible positive effects of (high) optimism may be weakened by a very low level of pessimism. Research limitations/implications Being cross-sectional, the study examines neither the causal links between the optimism-pessimism ratio and creativity nor other plausible causal links. The study was carried out at a single moment and did not capture the dynamics that occur over the course of time involving changes in optimism/pessimism and creativity. Future studies may adopt longitudinal or quasi-experimental designs. Practical implications Managers and organizations must consider that, even though positivity promotes creativity, some level of negativity may help positivity to produce creativity. Originality/value This study suggests that scholars who want to study the antecedents of creativity (and innovation) must be cautious in focusing only on the positive or the negative sides of individuals’ characteristics, and rather they must explore the interplay between both poles. Individuals may experience both positive and negative states/traits (Smith et al., 2016), and this both/and approach may impel them to think divergently, to challenge the status quo and to propose “out the box” and useful ideas.

We dreamed a dream that entrepreneurial ecosystems can promote sustainability

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mario Raposo ◽  
Cristina I. Fernandes ◽  
Pedro M. Veiga
Keyword(s):  
Policy Formulation ◽  
Logistic Distribution ◽  
Future Research ◽  
Community Innovation Survey ◽  
Content Type ◽  
Positive Effects ◽  
Entrepreneurial Ecosystems ◽  
Future Research Agenda ◽  
Company Policy ◽  
The Relationship

PurposeResearch into the relationship between entrepreneurial ecosystems and sustainability has deepened in terms of both quantity and quality even while still remaining a fragmented and divergent field. Hence, the purpose of this study is to put forward empirical evidence to advance the literature on the relationship between entrepreneurial ecosystems and sustainability. To this end, the authors furthermore identify and highlight a future research agenda.Design/methodology/approachThe source of the empirical analysis in this article stems from the Community Innovation Survey, the leading statistical inquiry of innovation in companies carried out by Eurostat based upon the conceptual framework set out in the Oslo Manual. For modelling the variables, the authors applied binary regression based on logistic distribution.FindingsThe results of the research demonstrated how all of the variables considered for entrepreneurial ecosystems (co-operation with suppliers, co-operation with clients or customers, co-operation with universities; co-operation with government, public or private research institutes) return positive impacts on national sustainabilityResearch limitations/implicationsDespite the data spanning only the nine countries in the database, the results enable insights into the theory as the results serve to strengthen already existing considerations on the positive effects of entrepreneurial ecosystems for the sustainability of countries.Practical implicationsThe results of the research may generate important implications for company policy formulation. The identification of the relevance of the different actors in entrepreneurial ecosystems and their impact on sustainability may assist firms and policymakers to identify the leading actors and the resources necessary to sustaining their activities and thereby correspondingly establishing their priorities.Originality/valueThe research (1) both deepens the prevailing knowledge on this theme and fills a gap encountered in the existing literature; (2) in practical terms, for managers, entrepreneurs and politicians to better grasp how entrepreneurship constitutes a systemic phenomenon and these systems require approaching in terms of their impacts and greater contributions to obtaining sustainability.

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