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Interactions between dependencies and nested relational structures

Patrick C. Fischer, Lawrence V. Saxton, Stan J. Thomas, Dirk Van Gucht
1985 Journal of computer and system sciences (Print)  
We then consider dependencies which hold in each block of the horizontally decomposed relation induced by nesting and study the relationship between these "local" dependencies and "global" dependencies  ...  In this paper we study how functional and multivalued dependencies interact with nesting. We describe how nesting preserves, alters, or destroys dependencies holding in a tirst-normal-form relation.  ...  ACKNOWLEDGMENT The authors gratefully acknowledge the helpful comments and suggestions of the referee  ... 
doi:10.1016/0022-0000(85)90057-1 fatcat:cj6ttkulfjehjlwzo4vplbgzui

Lack of costs associated with nest-related behaviors in an arachnid with exclusive paternal care

Gustavo S. Requena, Glauco Machado
2014 Oikos  
To assess energetic and survival costs of nest-related behaviors in this arthropod species, we measured body condition of nesting and non-nesting males and conducted a fi eld capturemark-recapture study  ...  Although intensively studied among birds and ectothermic vertebrates, the costs of nest-related behaviors in arthropods remain poorly explored.  ...  Acknowledgements -Author contributions: GSR and GM conceived and designed the sampling procedure. GSR collected the data and performed the statistical analyses. GSR and GM wrote the manuscript.  ... 
doi:10.1111/oik.01641 fatcat:ywgvk5vovzdrlanee47bmrosdi

Page 906 of The Journal of Animal Ecology Vol. 81, Issue 4 [page]

2012 The Journal of Animal Ecology  
We also expect that closely related hosts have higher chance to belong to the same network module and have a more nested parasite composi- tion than distantly related hosts, as nestedness depends posi-  ...  modular and non-nested network structure.  ... 

Hybrid structural arrangements mediate stability and feasibility in mutualistic networks [article]

Aniello Lampo, María J. Palazzi, Javier Borge-Holthoefer, Albert Solé-Ribalta
2021 arXiv   pre-print
Specifically, we examine in-block nestedness, compound by disjoint subsets of species (modules) with internal nested organization, and prove that it grants a balanced trade-off between stability and feasibility  ...  Remarkably, we analyze a large amount of empirical communities and find that a relevant fraction of them exhibits a marked in-block nested structure.  ...  In nested networks, the more specialist species interact only with sets of those interacting with the more generalists, and the related adjacency matrices manifest the traditional triangular structure.  ... 
arXiv:2105.09191v2 fatcat:u2eythrj3bhenpsp2vmywhnzti

Aspects of Composition in the Reflex AOP Kernel [chapter]

Éric Tanter
2006 Lecture Notes in Computer Science  
We overview the wide range of features for link composition in Reflex-which includes extensible operators for ordering and nesting of links, and control over the visibility of changes made by structural  ...  The core of Reflex is based on a model of partial reflection whose central abstractions are links: bindings between a (point)cut and an action.  ...  Guillaume Pothier, Leonardo Rodríguez and Rodolfo Toledo contributed to the implementation of the features described in this paper.  ... 
doi:10.1007/11821946_7 fatcat:2ar6mtfcj5dxbauf4edk7qxkva

Processing multiple non-adjacent dependencies: evidence from sequence learning

M. H. de Vries, K. M. Petersson, S. Geukes, P. Zwitserlood, M. H. Christiansen
2012 Philosophical Transactions of the Royal Society of London. Biological Sciences  
As for sequences with two dependencies, reaction times and prediction errors were similar for both nested and crossed dependencies.  ...  Both reaction times and prediction errors highlighted problems with processing the middle dependency in nested structures (A 1 A 2 A 3 B 3 _B 1 ), reminiscent of the 'missing-verb effect' observed in English  ...  (c) Processing differences between nested and crossed dependencies Another source of processing differences may relate to the nested and crossed dependencies themselves, which differ qualitatively as a  ... 
doi:10.1098/rstb.2011.0414 pmid:22688641 pmcid:PMC3367682 fatcat:fj5erxdh7jdqriz3mzhfoy3moa

Offspring social network structure predicts fitness in families

N. J. Royle, T. W. Pike, P. Heeb, H. Richner, M. Kolliker
2012 Proceedings of the Royal Society of London. Biological Sciences  
Social structures such as families emerge as outcomes of behavioural interactions among individuals, and can evolve over time if families with particular types of social structures tend to leave more individuals  ...  However, in species where parents feed dependant young, interactions within families nearly always involve more than two individuals simultaneously.  ...  ., P.H. and H.R. and the field data were collected by M.K. and P.H. Data were analysed by N.J.R. and T.W.P. All authors contributed to writing the manuscript.  ... 
doi:10.1098/rspb.2012.1701 pmid:23097505 pmcid:PMC3497231 fatcat:t3khc44on5havn7paqqwllip4a

Contrast in Edge Vegetation Structure Modifies the Predation Risk of Natural Ground Nests in an Agricultural Landscape

Nicole A. Schneider, Matthew Low, Debora Arlt, Tomas Pärt, Darren Mark Evans
2012 PLoS ONE  
to changes in nest conspicuousness between incubation and nestling feeding.  ...  However, few studies test whether differences in edge contrast (i.e. hard versus soft edges based on vegetation structure and height) affect edgerelated predation patterns and if such patterns are related  ...  Michael Griesser, Julia Stahl and one anonymous reviewer gave valuable comments on the manuscript. Author Contributions Conceived and designed the experiments: NAS TP.  ... 
doi:10.1371/journal.pone.0031517 pmid:22363659 pmcid:PMC3283633 fatcat:5ojw4q6d3beo5bgbzpkvf4kiqy

Density-Dependent Productivity in a Colonial Vulture at Two Spatial Scales

Darío Fernández-Bellon, Ainara Cortés-Avizanda, Rafael Arenas, José Antonio Donázar
2016 Bulletin of the Ecological Society of America  
We detected the existence of a trade-off between the disadvantages of nesting too close to conspecifics and the benefits of coloniality.  ...  These could be mediated by the agonistic interactions between breeding pairs and the benefits derived from social sharing of information by breeding individuals.  ...  The IAH was evaluated by fitting variables that would reflect interactions between nesting pairs (models Nd1 and Nd2).  ... 
doi:10.1002/bes2.1230 fatcat:fgkvtqxjwfeanf77z2mu2issdi

Effects of phenotypic complementarity and phylogeny on the nested structure of mutualistic networks

Enrico L. Rezende, Pedro Jordano, Jordi Bascompte
2007 Oikos  
that generalists interact with (nested interactions), and how phylogeny affects such interaction patterns.  ...  The hierarchical structure of phylogenetic relations can also contribute to increased nestedness because traits determining complementarity are then inherited in a correlated fashion.  ...  (to JB), and by the Spanish Ministry of Education and Science (Grants REN2003-00273 and CGL2006-00373 to PJ and REN2003-04774 to JB).  ... 
doi:10.1111/j.0030-1299.2007.16029.x fatcat:fomz6dlu6rgufjhi3qzqsd2l4q

Effects of phenotypic complementarity and phylogeny on the nested structure of mutualistic networks

Enrico L. Rezende, Pedro Jordano, Jordi Bascompte
2007 Oikos  
that generalists interact with (nested interactions), and how phylogeny affects such interaction patterns.  ...  The hierarchical structure of phylogenetic relations can also contribute to increased nestedness because traits determining complementarity are then inherited in a correlated fashion.  ...  (to JB), and by the Spanish Ministry of Education and Science (Grants REN2003-00273 and CGL2006-00373 to PJ and REN2003-04774 to JB).  ... 
doi:10.1111/j.2007.0030-1299.16029.x fatcat:flcfmelnt5cuplqwnorlrbouoy

Walk-Weighted Subsequence Kernels for Protein-Protein interaction extraction

Seonho Kim, Juntae Yoon, Jihoon Yang, Seog Park
2010 BMC Bioinformatics  
Conclusions: We addressed the genic interaction problem with various dependency kernels and suggested various structural kernel scenarios based on the directed shortest dependency path connecting two entities  ...  The construction of interaction networks between proteins is central to understanding the underlying biological processes.  ...  Some false negative interactions to be recognized are shown. The NE pairs relating a) nested entities and b) single dependency shortest paths are the examples.  ... 
doi:10.1186/1471-2105-11-107 pmid:20184736 pmcid:PMC2844389 fatcat:uw65kplfjbewpg2goy35cqbalu

The network structure of city-firm relations [article]

Antonios Garas, Celine Rozenblat, Frank Schweitzer
2015 arXiv   pre-print
Analysing the structure of this network, we find striking similarities with nested networks observed in ecology, where links represent mutualistic interactions between species.  ...  If we compare our analysis with external rankings about the quality of life in a city, we find that the nested structure of the city-firm network also reflects such information about the quality of life  ...  We thank Antoine Bellwald and Faraz Ahmed Zaidi for cleaning and aggregating the data. For our analysis we used the R software for statistical analysis v3.0.2, and the bipartite library v2.02.  ... 
arXiv:1512.02859v1 fatcat:eqqwnanohzdcrl6viiwpgyjswu

Comparisons and Contrasts between Asymmetry and Nestedness in Interacting Ecological Networks

Gilberto Corso, N. F. Britton
2014 Open Journal of Ecology  
We compare and contrast asymmetry and nestedness, two concepts used in the characterisation of the specialist-generalist balance in bipartite ecological interaction networks.  ...  The minimal asymmetry is marked by a modular core of interactions between species that are neither specialists nor generalists.  ...  Asymmetry Distribution among Nested Patterns To understand how connectivity or dependence asymmetry and nestedness are related we plot histograms of c for all the multiplicity of nested patterns.  ... 
doi:10.4236/oje.2014.411055 fatcat:aw5fm7dttfcnzhoxgvc2sac3xi

Angle-resolved photoemission observation of the superconducting-gap minimum and its relation to the nesting vector in the phonon-mediated superconductorYNi2B2C

T. Baba, T. Yokoya, S. Tsuda, T. Watanabe, M. Nohara, H. Takagi, T. Oguchi, S. Shin
2010 Physical Review B  
This shows close correlation between the nesting vector and node formation. Superconductivity is a macroscopically emerged quantum phenomenon derived from many body interactions inside a solid.  ...  For understanding the origin of the large SC gap anisotropy, it has been considered essential to determine the direction and type of nodal structure and to study its relation to nesting vector 14,15 reported  ...  This shows close correlation between the nesting vector and node formation. Superconductivity is a macroscopically emerged quantum phenomenon derived from many body interactions inside a solid.  ... 
doi:10.1103/physrevb.81.180509 fatcat:sy2i37qwujcl7gkr5wy3mbemyq
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