Niche partitioning reduces interspecific competition, facilitating coexistence. In urban ecosystems, however, habitat loss reduces species’ ability to spatially partition activity. Temporal partitioning may thus increase in urban areas as species, unable to avoid each other spatially, partition time to avoid competition. In Midwestern US cities, eastern gray squirrels (Sciurus carolinensis) and fox squirrels (S. niger) co-occur and compete for resources. We identified urban gray and fox squirrel activity patterns and how they vary with season, land cover, and among sites where they do and do not co-occur using camera-trap data. Both species’ activity patterns varied with season and canopy and impervious surface cover. Gray squirrel activity patterns varied in the presence of fox squirrels only in the fall, providing limited support for our temporal partitioning hypothesis. Temporal niche partitioning may thus play a role in supporting these species co-existence when competition is seasonally-elevated (e.g., fall hording), but appears less important in other seasons.
This paper explores young people's expressed concerns about privacy in the context of a highly mediated cultural environment, mapping social media practices against axes of visibility and participation. Drawing on interdisciplinary conceptual resources from both the humanities and social sciences, we use ‘spectacles of intimacy’ to conceptualise breaches of privacy, mapping an emergent moral landscape for young people that moves beyond concerns with e-safety to engage with the production and circulation of audiences and value. The paper draws on data from a methodological innovation project using multi-media and mixed methods to capture lived temporalities for children and young people. We present a model that captures a moral landscape shaped by emotional concerns about social media, the affordances of those media and affective discourses emerging from young people's use of the media. 相似文献
This study examines the strategies and impact of six activist groups concerned about British broadcasting policies and programming. Particular emphasis is placed on strategic relationship building, which played a central role in groups’ interactions with target publics, and on the activists’ perspective. The study is contextualized within the political culture of the United Kingdom and a changing broadcasting landscape. The data suggested that building strategic relationships is one of the major ways in which pressure groups have an impact on their targets. When assessing effectiveness, respondents looked beyond tangible gains by activists to long-term relationships with targets, which were contingent on critical dimensions. These included trust, mutual respect, openness and access. Groups bolstered their credibility by engaging in research and structuring educational events such as conferences and symposia, in which they enhanced the scope and quality of debate about broadcasting policy. Public relations has a role in facilitating both citizen debate within the public sphere of civil society and the relationships that make such debate possible. These groups may be a model for activists in other societies. 相似文献
This paper will focus on the turn-taking patterns of Deaf signers and will compare them with turn-taking patterns found in spoken interaction. Turn-taking in the conversation of hearing people has been the subject of considerable attention, but the way conversation is organised by Deaf conversationalists has received less attention. This paper reports on a small project involving conversational data obtained from two Deaf friendship groups, one all-female and one all-male. Our main aim was to establish whether Deaf interactants orient to a one-at-a-time model of turn-taking, or whether there was any evidence to suggest they can also orient to a more collaborative model. It has been assumed by researchers in the field of Deaf Studies that Deaf interactants orient to a one-at-a-time model since, where the medium of communication is visual rather than sound based, participants can attend to only those sources of talk that they can see. The paper also examines the data to see if there are any gender differences in the way Deaf interactants organise conversation. 相似文献
The binary model that presents women as peaceful and men as warfaring is a common conception of war and peace. Despite increasing levels of gender equality in most spheres of public life and decreasing gender segregation in institutions in many parts of the world, the associational link of men to war and women to peace remains widespread. Focusing on the Israeli women??s peace organization, Machsom Watch, this article uses a content analysis of interactions between Machsom Watch activists, soldiers and Palestinians to examine how gendered political opportunity structures affect and are affected by interactions between individuals, organizations and institutions. The paper highlights the contradiction between Machsom Watch??s form as a women-only organization and their framing and report language, which is non-gender specific. I argue that this contradiction emerges from their strategic negotiation of the gendered political opportunity structure as well as their culturally bounded experiences of gendered interactions and embodied gender norms. More generally, I argue that by understanding political opportunity structures as being bound by cultural norms that create distinct sets of opportunities and constraints for different groups of people, scholars can better understand the particular manifestation of social movement action and thereby more fully account for human agency in social and political structures. Additionally, this paper encourages social movement scholars to understand social movement framing as both a product of political opportunities and constraints as well as an influence in the formation of the political opportunity structure. 相似文献
Children (aged 9, 14, 19, and 24 months) were encouraged to use tools to achieve a demonstrated goal. Each tool was most efficiently applied when held by the handle with the thumb toward the head of the tool in a radial grip. The tools were presented at midline and oriented to the left and right on alternating trials, so the children who managed to grasp a tool in both orientations with the radial grip demonstrated planning of actions in advance. The tools included a spoon, hairbrush, toy hammer, and magnet; the goals were to feed one's self, feed another, brush one's hair, brush another's hair, hit pegs, and retrieve metal objects. Children were found to use more radial grips with the self‐directed tools (i.e., hairbrush‐to‐self and spoon‐to‐self), indicating that they could plan their actions better when directed toward the self than toward an external goal. 相似文献
Our image of the infant as an organism interacting with the environment has changed dramatically in the past 40 years. A new surge of infancy research began in the 1960s and continues unabated today. The view of the infant has been transformed from that of a primarily reflexive organism to a highly competent being, exquisitely sensitive to sensory and perceptual information. Controversy still swirls around the issue of when infants acquire specific knowledge about objects and events. New work is reviewed on how infants and toddlers use knowledge to guide their behavior in challenging situations. Despite the tremendous growth of knowledge about infant development over the past 40 years, it seems that we are on the threshold of even more exciting discoveries. 相似文献