Insectivorous bats form mobile sensory networks to optimize prey localization: The case of the common noctule bat.

Animals that depend on ephemeral, patchily distributed prey often use public information to locate resource patches. The use of public information can lead to the aggregation of foragers at prey patches, a mechanism known as local enhancement. However, when ephemeral resources are distributed over large areas, foragers may also need to increase search efficiency, and thus apply social strategies when sampling the landscape. While sensory networks of visually oriented animals have already been confirmed, we lack an understanding of how acoustic eavesdropping adds to the formation of sensory networks. Here we radio-tracked a total of 81 aerial-hawking bats at very high spatiotemporal resolution during five sessions over 3 y, recording up to 19 individuals simultaneously. Analyses of interactive flight behavior provide conclusive evidence that bats form temporary mobile sensory networks by adjusting their movements to neighboring conspecifics while probing the airspace for prey. Complementary agent-based simulations confirmed that the observed movement patterns can lead to the formation of mobile sensory networks, and that bats located prey faster when networking than when relying only on local enhancement or searching solitarily. However, the benefit of networking diminished with decreasing group size. The combination of empirical analyses and simulations elucidates how animal groups use acoustic information to efficiently locate unpredictable and ephemeral food patches. Our results highlight that declining local populations of social foragers may thus suffer from Allee effects that increase the risk of collapses under global change scenarios, like insect decline and habitat degradation.

Spatio-temporal variability in transmission risk of human schistosomes and animal trematodes in a seasonally desiccating East African landscape.

Different populations of hosts and parasites experience distinct seasonality in environmental factors, depending on local-scale biotic and abiotic factors. This can lead to highly heterogeneous disease outcomes across host ranges. Variable seasonality characterizes urogenital schistosomiasis, a neglected tropical disease caused by parasitic trematodes (Schistosoma haematobium). Their intermediate hosts are aquatic Bulinus snails that are highly adapted to extreme rainfall seasonality, undergoing prolonged dormancy yearly. While Bulinus snails have a remarkable capacity for rebounding following dormancy, we investigated the extent to which parasite survival within snails is diminished. We conducted an investigation of seasonal snail schistosome dynamics in 109 ponds of variable ephemerality in Tanzania from August 2021 to July 2022. First, we found that ponds have two synchronized peaks of schistosome infection prevalence and observed cercariae, though of lower magnitude in the fully desiccating than non-desiccating ponds. Second, we evaluated total yearly schistosome prevalence across an ephemerality gradient, finding ponds with intermediate ephemerality to have the highest infection rates. We also investigated dynamics of non-schistosome trematodes, which lacked synonymity with schistosome patterns. We found peak schistosome transmission risk at intermediate pond ephemerality, thus the impacts of anticipated increases in landscape desiccation could result in increases or decreases in transmission risk with global change.

Evaluating the definition and distribution of spring ephemeral wildflowers in eastern North America.

PREMISE: The herbaceous layer accounts for the majority of plant biodiversity in eastern North American forests, encompassing substantial variation in life history strategy and function. One group of early-season herbaceous understory species, colloquially referred to as spring ephemeral wildflowers, are ecologically and culturally important, but little is known about the prevalence and biogeographic patterns of the spring ephemeral strategy. METHODS: We used observations collected by the Global Biodiversity Information Facility (GBIF) to quantify the ephemerality of 559 understory forb species across eastern North America and classify them according to a continuous ephemerality index (ranging from 0 = never ephemeral to 1 = always ephemeral). We then used this information to model where ephemeral forbs were most common across the landscape with the goal of identifying geographic and environmental drivers important to their distributions and ranges. RESULTS: Only 3.4% of all understory wildflower species were spring ephemerals in all parts of their range, and 18.4% (103 species) were ephemeral in at least part of their range. Spring ephemerals peaked in absolute species richness and relative proportion at mid latitudes. CONCLUSIONS: Spring ephemeral phenology is an important shade-avoidance strategy for a large segment of the total understory species in temperate deciduous forests. In North America, the strategy is relatively most important for forest understories at mid latitudes. The definitions of spring ephemerality we provide here serve as an important ecological context for conservation priorities and to evaluate responses of this biodiverse group to future environmental change.

Spatiotemporal variability in transmission risk of human schistosomes and animal trematodes in a seasonally desiccating East African landscape.

Different populations of hosts and parasites experience distinct seasonality in environmental factors, depending on local-scale biotic and abiotic factors. This can lead to highly heterogenous disease outcomes across host ranges. Variable seasonality characterizes urogenital schistosomiasis, a neglected tropical disease caused by parasitic trematodes (Schistosoma haematobium). Their intermediate hosts are aquatic Bulinus snails that are highly adapted to extreme rainfall seasonality, undergoing dormancy for up to seven months yearly. While Bulinus snails have a remarkable capacity for rebounding following dormancy, parasite survival within snails is greatly diminished. We conducted a year-round investigation of seasonal snail-schistosome dynamics in 109 ponds of variable ephemerality in Tanzania. First, we found that ponds have two synchronized peaks of schistosome infection prevalence and cercariae release, though of lower magnitude in the fully desiccating ponds than non-desiccating ponds. Second, we evaluated total yearly prevalence across a gradient of an ephemerality, finding ponds with intermediate ephemerality to have the highest infection rates. We also investigated dynamics of non-schistosome trematodes, which lacked synonymity with schistosome patterns. We found peak schistosome transmission risk at intermediate pond ephemerality, thus the impacts of anticipated increases in landscape desiccation could result in increases or decreases in transmission risk with global change.

Behind the Scenes at ApertureScience.com: Portal and Its Paratexts.

Portal (2007) presents an unusually complex example for the study of video game paratexts. This article uses the case of the game's promotional website ApertureScience.com to consider how paratextuality and the associated concepts of ephemerality and materiality may be further refined to open up new dimensions of video games as objects of interpretation and play. The article draws from the field of textual studies, which specializes in the particularities of media, and in the entanglement of technical detail with interpretation and meaning. The first part re-evaluates the nature of the book as an analogy for the materiality of video games, and critiques Gérard Genette's conception of bookish paratexts and its applicability to video games. The article then offers a detailed analysis of ApertureScience.com as a paratext, including its satirical critiques of positivism and corporate research, and concludes with a discussion of the materiality of digital paratexts.

(Extra)ordinary Relationalities: Methodological Suggestions for Studying Queer Relationalities Through the Prism of Memory, Sensation, and Affect.

This article advances specific methodological suggestions for the study of queer relationalities. Arguing that previous queer scholarship focusing on methodology advances suggestions that are too general to be usefully applied to the study of queer relationalities, this article contends that researchers of queer relationalities can describe and analyze ephemeral and covert instances of queer relationalities in relation to memory, sensation, and affect in order to render them legible, illuminate them, and prevent their subsequent erasure by power. To accomplish this, this article explores three instances of queer relationalities to illustrate how these methodological suggestions can be applied. Additionally, this article aims to intervene in what is generally perceived as constituting proper data in scholarship.

Sharing Personal Memories on Ephemeral Social Media Facilitates Autobiographical Memory.

The mnemonic effect of posting personal experiences on ephemeral social media was examined. Participants completed a daily diary for 6 consecutive days. On alternate days they were instructed to use, or refrain from using, the ephemeral social media platform Snapchat. At the end of the week, participants received a surprise memory test for the contents of the diaries. We observed significantly superior recall for memories encoded on the Snapchat days, demonstrating memory facilitation despite memory type equivalency across the posting and no posting conditions. The study is the first to examine the effect of Snapchat use on autobiographical memory, with the findings supporting previous work showing that posting on social media facilitates memory. Given the ephemerality of Snapchat posts, the reported improvement in memory contradicts the notion that cognitive offloading occurs automatically when posting memories online.

The effect of Snapchat on learner satisfaction and anatomical knowledge retention: Preliminary observations.

Biomedical educators have turned to technologies, like social media, to supplement progressive reductions in time spent in class. Many studies of social media have been limited to quantifying learner satisfaction and studies on the effects on learning outcomes are sparse. The purpose of this study was to examine the effects of using Snapchat on learner satisfaction and learning outcomes. A Snapchat account was used to share blood flow diagrams during the anatomy course of a physical therapist education program. Viewing statistics were recorded, a survey was distributed, and learning outcomes quantified at the end of the course and 12 months later were compared with a control group that did not have access to the account. Eighty-two percent of the class subscribed to the Snapchat account and 86.7% of the subscribers completed viewing of the five drawings posted. Learners rated the account as extremely accurate, were quite interested in more content presented, and felt quite confident in the diagrams. Performance on blood flow questions on the end of course examinations were similar between experimental and control groups. Assessments administered 12 months later revealed greater scores for the Snapchat group (90.7% correct) compared with the control group (86.7% correct, p = 0.04). These findings suggest that Snapchat is an effective way to deliver educational content and that learners found the content useful, accurate, and helpful in preparing them for the assessment. The ephemeral nature of disappearing content has potential to garner greater student attention and can be leveraged to improve knowledge retention.

Ephemerality in Social Media: Unpacking the Personal and Social Characteristics of Time Limit Users on WeChat Moments.

Social media platforms increasingly give users the option of ephemerality through settings that delete or hide posted content after a set period of time. Many individuals apply these settings to manage their posting history and, in turn, reduce concerns about self-presentation. Despite the growing popularity of this feature, few studies have empirically explored it. This study examines the Time Limit setting on WeChat Moments as an example and investigates how users using the Time Limit setting differ from nonusers in terms of personal characteristics (demographics, personality traits, psychological factors, and previous behavioral patterns) and social characteristics (audience size and audience diversity). Compared with nonusers, users using Time Limit setting scored significantly higher on posting frequency and privacy setting use and scored significantly lower on audience size. We also examine how personal and social characteristics vary between user groups with different degrees of ephemerality (i.e., low, medium, or high). Our findings show that users using the Time Limit setting who scored higher on measures of life changes, self-monitoring, posting frequency, and audience size and lower on perceived stress were more likely to opt for the low (i.e., 6months) rather than the medium (i.e., 1month) or high (i.e., 3days) degree of ephemerality. Our work contributes to the understanding of ephemerality settings on social media platforms and provides insights that help practitioners design more effective platforms.

Automatic Archiving versus Default Deletion: What Snapchat Tells Us About Ephemerality in Design.

Unlike most social media, where automatic archiving of data is the default, Snapchat defaults to ephemerality: deleting content shortly after it is viewed by a receiver. Interviews with 25 Snapchat users show that ephemerality plays a key role in shaping their practices. Along with friend-adding features that facilitate a network of mostly close relations, default deletion affords everyday, mundane talk and reduces self-consciousness while encouraging playful interaction. Further, although receivers can save content through screenshots, senders are notified; this selective saving with notification supports complex information norms that preserve the feel of ephemeral communication while supporting the capture of meaningful content. This dance of giving and taking, sharing and showing, and agency for both senders and receivers provides the basis for a rich design space of mechanisms, levels, and domains for ephemerality.