Search results for "competition."
showing 10 items of 1367 documents
Sperm competition and small size advantage for males of the golden orb-web spider Nephila edulis
2000
Sexual selection, through female choice and/or male‐male competition, has influenced the nature and direction of sexual size dimorphism in numerous species. However, few studies have examined the influence of sperm competition on size dimorphism. The orb-web spider Nephila edulis has a polygamous mating system and extreme size dimorphism. Additionally, the frequency distribution of male body size is extremely skewed with most males being small and few large. The duration of copulation, male size and sexual cannibalism have been identified as the significant factors determining patterns of sperm precedence in spiders. In double mating trials, females were assigned to three treatments: either…
Il contributo degli architetti siciliani ai concorsi per le nuove chiese italiane della CEI
2015
Il saggio analizza il contributo degli architetti siciliani ai concorsi per le nuove chiese italiane della CEI. Nell’ambito di tale lunga esperienza promossa dalla CEI, il contributo degli architetti siciliani alla realizzazione delle nuove chiese italiane appare particolarmente significativo e si distingue per una costante presenza in tutti i concorsi e per la qualità dei risultati raggiunti attraverso l’esplorazione di temi progettuali tutti interni al processo di rinnovamento liturgico e rituale. Pasquale Culotta e Giuseppe (Bibi) Leone sono i primi a esordire nell’iniziale concorso indetto nel 1998 con il progetto per la parrocchia di San Giovan Battista in Lecce. L’anno successivo, Vin…
Performance Analysis of Cooperative V2V and V2I Communications Under Correlated Fading
2019
Cooperative vehicular networks will play a vital role in the coming years to implement various intelligent transportation-related applications. Both vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications will be needed to reliably disseminate information in a vehicular network. In this regard, a roadside unit (RSU) equipped with multiple antennas can improve the network capacity. While the traditional approaches assume antennas to experience independent fading, we consider a more practical uplink scenario where antennas at the RSU experience correlated fading. In particular, we evaluate the packet error probability for two renowned antenna correlation models, i.e., cons…
Hybridization studies inSilene subgen.Petrocoptis (Caryophyllaceae)
2006
Silene subgenusPetrocoptis comprises sexual diploid taxa and it is restricted to calcareous cliffs in the Iberian peninsula. Artificial crosses involvingSilene pyrenaica (Bergeret)Mayol etRossello (≡Petrocoptis pyrenaica (Bergeret)Walp.),Silene laxipruinosa Mayol etRossello andS. montserratii subsp.crassifolia (Rouy)Mayol etRossello (≡P. crassifolia Rouy) were attempted to assess the extent of barriers developed within the subgenusPetrocoptis. Usually, intraspecific crosses involving allopatric populations were successful, suggesting that geographically isolated populations are not genetically isolated. Cross-compatibility was noted among the polymorphicS. pyrenaica, which developed fertile…
On the Location and 'Lock-In' of Cities: Geography vs. Transportation Technology
2004
We investigate where cities are located in a spatial economy and why they tend to get 'locked-in' at particular sites. Building on Fujita and Krugman (1995) we show that geography and/or transportation technology must exhibit some 'non-smoothness' for cities to possibly become 'locked-in' in location space. Our results establish that no asymmetric monocentric equilibrium can be generically sustained when space is homogenous and transportation technologies are 'smooth', whereas it can in the presence of transportation hubs and/or concave transport cost functions. This suggests that cities are drawn to transportation hubs during the early stages of economic development, whereas they can be su…
Switching spatial scale reveals dominance-dependent social foraging tactics in a wild primate.
2017
When foraging in a social group, individuals are faced with the choice of sampling their environment directly or exploiting the discoveries of others. The evolutionary dynamics of this trade-off have been explored mathematically through the producer-scrounger game, which has highlighted socially exploitative behaviours as a major potential cost of group living. However, our understanding of the tight interplay that can exist between social dominance and scrounging behaviour is limited. To date, only two theoretical studies have explored this relationship systematically, demonstrating that because scrounging requires joining a competitor at a resource, it should become exclusive to high-rank…
A capital framework for professional learning and practice
2020
Abstract Efforts to improve teaching and learning in general are leading to wide variability in outcomes in different countries and areas, with similar investments and reforms focusing on the instrumental side of professional learning. A rapidly growing research literature has suggested the important role of social connectivity in the success of individual and organizational change and development. This paper draws on theories of human capital, social capital, social network, emotional capital, and research literature in this space to illuminate some of the complex components as related to professional learning.
Expanding the Family Frame: Social Specialists, Mediated Experiences, and Gendered Images of Mobility in Transnational Wedding Videos
2021
This contribution explores the role of wedding videos in shaping transnational social relationships. Examining the production and aesthetic means of these ‘mobile images of mobility’, I show how videographers serve as ritual and social specialists to bring to the fore a fictionalized, imagined place of transnational social relationships. As evidence of ‘memory objects’ for life events, these videos form the basis for mediated experiences in transnational settings, relating those depicted to those engaging in and those watching the videos. They all become part of the social relationships that are inscribed in the video. Yet this imaginary filmic space creates gendered, contested spaces of mo…
Progressive Recovery of a Marine Gastropod Community Following Atmospheric Nuclear Tests in French- Polynesia: A Socio-ecological Interpretation
2021
Aims: The way species-richness is accommodated and how species-abundance distribution is organized in a hierarchic pattern is central to community ecology. Yet, the process by which species-richness and species-abundances are progressively accommodated can hardly be monitored, in practice, at a sufficiently large spatial scale. Fortunately, the progressive recovery of marine communities, after their complete destruction by atmospheric nuclear tests, yet offered unique opportunity to monitor the full process of accommodation of increasing species-richness and the associated, transient development of strong interspecific competition, all along the process of recovery.
 Methods: Taking fu…
The assemblage of culture-led policies in small towns and rural communities
2019
Abstract The mobile global discourse on culture’s prominent role in driving development policies is increasingly influencing small cities and rural communities. Global networks of information and ideas flow through space and become reconstructed as place-based and territorial narratives or policy assemblages; meanwhile, communities are increasingly producing local policies within these networks. The policy mobility literature has been occupied with perspectives on how to follow policies; it has only to a limited degree addressed empirical questions about how such policies are constructed from a situated perspective. Therefore, an analytical approach is needed to analyze the empirical constr…