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Habitat and community structure modulate fish interactions in a neotropical clearwater river Neotropical Ichthyology
Nunes,Lucas T.; Morais,Renato A.; Longo,Guilherme O.; Sabino,José; Floeter,Sergio R..
ABSTRACT Species interactions can modulate the diversity and enhance the stability of biological communities in aquatic ecosystems. Despite previous efforts to describe fish interactions in tropical rivers, the role of habitat characteristics, community structure, and trophic traits over these interactions is still poorly understood. To investigate among-habitat variation in substratum feeding pressure and agonistic interactions between fishes, we used remote underwater videos in three habitats of a clearwater river in the Central Western, Brazil. We also performed visual surveys to estimate the abundance and biomass of fishes and proposed a trophic classification to understand how these variables can affect fish interactions. Community structure was the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bodoquena plateau; Centrality; Characidae; Feeding pressure; Habitat heterogeneity.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100217
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The Repeated Prisoner’s Dilemma in a Network AgEcon
Kinateder, Markus.
Imperfect private monitoring in an infinitely repeated discounted Prisoner’s Dilemma played on a communication network is studied. Players observe their direct neighbors’ behavior only, but communicate strategically the repeated game’s history throughout the network. The delay in receiving this information requires the players to be more patient to sustain the same level of cooperation as in a complete network, although a Folk Theorem obtains when the players are patient enough. All equilibria under exogenously imposed truth-telling extend to strategic communication, and additional ones arise due to richer communication. There are equilibria in which a player lies. The flow of information is related with network centrality measures.
Tipo: Working or Discussion Paper Palavras-chave: Repeated Game; Prisoner’s Dilemma; Imperfect Private Monitoring; Network; Strategic Communication; Centrality; Environmental Economics and Policy; C72; C73; D85.
Ano: 2010 URL: http://purl.umn.edu/96669
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The Sixth Framework Program as an Affiliation Network: Representation and Analysis AgEcon
Billand, Pascal; Frachisse, David; Massard, Nadine.
In this paper, we compare two different representations of Framework Programs as affiliation network: “One-mode networks”' and “Two-mode networks”'. The aim of this article is to show that the choice of the representation has an impact on the analysis of the networks and on the results of the analysis. In order to support our proposals, we present two forms of representation and different indicators used in the analysis. We study the network of the 6th Framework Program using the two forms of representation. In particular, we show that the identification of the central nodes is sensitive to the chosen representation. Furthermore, the nodes forming the core of the network vary according to the representation. These differences of results are important as...
Tipo: Working or Discussion Paper Palavras-chave: Affiliation Network; Innovation Policies; Centrality; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; 031; 038; L14.
Ano: 2008 URL: http://purl.umn.edu/6217
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