scholarly journals Spatial trophic cascades in communities connected by dispersal and foraging

2018 ◽  
Author(s):  
David García-Callejas ◽  
Roberto Molowny-Horas ◽  
Miguel B. Araújo ◽  
Dominique Gravel
Keyword(s):  
Indirect Effects ◽  
Local Community ◽  
Regional Scale ◽  
Spatial Dimension ◽  
Interaction Effects ◽  
Spatially Explicit ◽  
Pairwise Interactions ◽  
Scale Point ◽  
Fully Connected ◽  
Theoretical Results

AbstractPairwise interactions between species have indirect consequences that reverberate throughout the whole ecosystem. In particular, interaction effects may propagate in a spatial dimension, to localities connected by organismal movement. Here we study the propagation of interactions with a spatially explicit metacommunity model, where local sites are connected by dispersal, foraging, or by both types of movement. We show that direct and net effects of pairwise interactions may differ in sign when foraging across localities is prevalent. Further, the effect of a species over another in the local community does not necessarily correspond to its effect at the metacommunity scale; this correspondence is again mediated by the type of movement across localities. Networks of net effects are fully connected, indicating that every species in the metacommunity has a non-zero influence on every other species. Lastly, the magnitude of net effects between any two species strongly decays with the distance between them. These theoretical results strengthen the importance of considering indirect effects across species at both the local and regional scale, point to the differences between types of movement across locations, and thus open novel avenues for the study of interaction effects in spatially explicit settings.

scholarly journals THE MERAH MOSQUE AND THE ASY SYAFI’I MOSQUE CONSIDERED AS LANDMARKS BASED ON THE LOCAL COMMUNITY’S RECOGNITION IN CIREBON’S ARAB PANJUNAN KAMPONG

2018 ◽  
Vol 2 (01) ◽  
pp. 17-34
Author(s):  
Ajeng Triwuri Widyastuti ; Giosia P. Widjaja
Keyword(s):  
Cultural History ◽  
Urban Design ◽  
Local Community ◽  
Regional Scale ◽  
Architectural Elements ◽  
History Of ◽  
The Rich ◽  
Conducting Research ◽  
And Gender ◽  
Heritage Area

Abstract - The Arab Panjunan kampong serving as the research object happens to be one of the heritage areas of Cirebon Town. This urban kampong has certain ethnic characteristics typical of Arab quarters that make it unique, thus contributing to the rich cultural history of Cirebon. As a heritage area, it is important for this ethnic Arab neighbourhood of Panjunan to draw up an inventory of the specific architectural elements that are still traceable, such as the urban lay-out and its contents as well as the landmarks of this area observed from a physical-spatial angle. The aim of this research project is to find out about this kampong’s various architectural elements that are recognized as such by the locals. This will be the contributing factor in the process of determining which environmental elements can be classified as typical landmarks. The first step taken in the research conducted is field observation in order to establish the elements that have survived in the kampong, including the architectural, social, and cultural ones. The observation related to architectural elements has been identified in accordance with the theory concerning Elements of Urban Design as proposed by Hamid Shirvani in his book The Urban Design Process. The next step is conducting research using the Cognitive Method as applied to the kampong dwellers in Panjunan by way of sketched maps and guided interviews. The respondents, classified based on ethnic heritage (descent) and gender, were requested to describe the environmental elements in this ethnic Arab kampong as far as they could recognize or identify them. Those who experienced difficulties in describing the sketches were assisted by the researcher based on the stories that had been supplied. Based on the acquired data containing these environmental elements, the aspect of memories contained therein was studied by way of interviews linked to the Continuity Theory by Breakwell. Subsequently, an analysis was made of the basis underlying the recognition of these elements based on the Landmark Theory by Kevin Lynch, and classified based on the criteria drawn up by Eko Budihardjo. Through the analysis, it was discovered that Panjunan’s Merah Mosque and its Asy Syafi’i Mosque indeed qualify as as architectural elements that show continuity of memory, gaining validity as iconic elements or landmarks on the regional scale of Cirebon’s ethnic Arab kampong of Panjunan. Keywords : mosque, landmark, recognition, local community, Arab Panjunan kampong

scholarly journals A bottom-up spatially explicit methodology to estimate the space heating demand of the building stock at regional scale

2020 ◽  
Vol 206 ◽  
pp. 109581 ◽  
Author(s):  
Valentina D'Alonzo ◽  
Antonio Novelli ◽  
Roberto Vaccaro ◽  
Daniele Vettorato ◽  
Rossano Albatici ◽  
...  
Keyword(s):  
Regional Scale ◽  
Space Heating ◽  
Spatially Explicit ◽  
Building Stock ◽  
Bottom Up

scholarly journals The two dimensions of Italian academics’ public engagement

2020 ◽  
Author(s):  
Monia Anzivino ◽  
Flavio A. Ceravolo ◽  
Michele Rostan
Keyword(s):  
Data Analysis ◽  
Public Engagement ◽  
Local Community ◽  
Response Rate ◽  
Common Factors ◽  
Political Engagement ◽  
Spatial Dimension ◽  
Two Dimensions ◽  
Academic Rank ◽  
Third Mission

AbstractThe article aims at investigating Italian academics’ Public Engagement highlighting its two dimensions, namely “Local Community Engagement” (LCE) and “General Political Engagement” (GPE). It is based on the results of a national survey on academics’ third mission activities carried out in the year 2015/2016 collecting information from a representative sample of 5,123 respondents working at 62 universities, with a response rate of 34.2%. In addition to detecting distinct dimensions of academics’ Public Engagement, data analysis shows that Italian academics are much more involved in LCE activities than in GPE ones. Although both LCE and GPE are influenced by many common factors, such as academic rank, discipline and being involved in other third mission activities, they also display peculiar traits: LCE activities are more likely to involve academic women while GPE are more likely to be carried out by older academics; LCE activities appear to be context-dependent while GPE activities are not. Hence, the article offers a contribution to a better understanding of the different goals of Public Engagement activities and of their spatial dimension.

Direct and indirect effects of climate change on herbicide leaching — A regional scale assessment in Sweden

2015 ◽  
Vol 514 ◽  
pp. 239-249 ◽  
Author(s):  
Karin Steffens ◽  
Nicholas Jarvis ◽  
Elisabet Lewan ◽  
Bodil Lindström ◽  
Jenny Kreuger ◽  
...  
Keyword(s):  
Climate Change ◽  
Indirect Effects ◽  
Regional Scale ◽  
Direct And Indirect Effects ◽  
Scale Assessment

CONTROL OF THE TRANSITION TO CHAOS IN NEURAL NETWORKS WITH RANDOM CONNECTIVITY

1993 ◽  
Vol 03 (02) ◽  
pp. 279-291 ◽  
Author(s):  
B. DOYON ◽  
B. CESSAC ◽  
M. QUOY ◽  
M. SAMUELIDES
Keyword(s):  
Neural Networks ◽  
Chaotic Dynamics ◽  
Synaptic Coupling ◽  
Sustained Activity ◽  
Weak Connectivity ◽  
Fully Connected ◽  
The Brain ◽  
Theoretical Results ◽  
Random Connectivity

The occurrence of chaos in recurrent neural networks is supposed to depend on the architecture and on the synaptic coupling strength. It is studied here for a randomly diluted architecture. We produce a bifurcation parameter independent of the connectivity that allows a sustained activity and the occurrence of chaos when reaching a critical value. Even for weak connectivity and small size, we find numerical results in accordance with the theoretical ones previously established for fully connected infinite sized networks. Moreover the route towards chaos is numerically checked to be a quasiperiodic one, whatever the type of the first bifurcation is. In the discussion, we connect these results to some recent theoretical results about highly diluted networks. Hints are provided for further investigations to elicit the role of chaotic dynamics in the cognitive processes of the brain.

scholarly journals A food web approach reveals the vulnerability of biocontrol services by birds and bats to landscape modification at regional scale

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
José M. Herrera ◽  
Bruno Silva ◽  
Gerardo Jiménez-Navarro ◽  
Silvia Barreiro ◽  
Nereida Melguizo-Ruiz ◽  
...  
Keyword(s):  
Insect Pests ◽  
Spatial Scales ◽  
Insect Pest ◽  
Regional Scale ◽  
Spatially Explicit ◽  
Pest Species ◽  
Vertebrate Species ◽  
Landscape Modification ◽  
Olive Groves ◽  
Biocontrol Potential

AbstractPest control services provided by naturally occurring species (the so-called biocontrol services) are widely recognized to provide key incentives for biodiversity conservation. This is particularly relevant for vertebrate-mediated biocontrol services as many vertebrate species are of conservation concern, with most of their decline associated to landscape modification for agricultural purposes. Yet, we still lack rigorous approaches evaluating landscape-level correlates of biocontrol potential by vertebrates over broad spatial extents to better inform land-use and management decisions. We performed a spatially-explicit interaction-based assessment of potential biocontrol services in Portugal, using 1853 pairwise trophic interactions between 78 flying vertebrate species (birds and bats) and 53 insect pests associated to two widespread and economically valuable crops in the Euro-Mediterranean region, olive groves (Olea europaea subsp. europaea) and vineyards (Vitis vinifera subsp. vinifera). The study area was framed using 1004 square cells, each 10 × 10 km in size. Potential biocontrol services were determined at all those 10 × 10 km grid-cells in which each crop was present as the proportion of the realized out of all potential pairwise interactions between vertebrates and pests. Landscape correlates of biocontrol potential were also explored. Our work suggests that both birds and bats can effectively provide biocontrol services in olive groves and vineyards as they prey many insect pest species associated to both crops. Moreover, it demonstrates that these potential services are impacted by landscape-scale features and that this impact is consistent when evaluated over broad spatial extents. Thus, biocontrol potential by vertebrates significantly increases with increasing amount of natural area, while decreases with increasing area devoted to target crops, particularly olive groves. Overall, our study highlights the suitability of our interaction-based approach to perform spatially-explicit assessments of potential biocontrol services by vertebrates at local spatial scales and suggest its utility for integrating biodiversity and ecosystem services in conservation planning over broad spatial extents.

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