scholarly journals Climatic seasonality may affect ecological network structure: Food webs and mutualistic networks

Biosystems ◽  
2014 ◽  
Vol 121 ◽  
pp. 29-37 ◽  
Author(s):  
Kazuhiro Takemoto ◽  
Saori Kanamaru ◽  
Wenfeng Feng
2019 ◽  
Author(s):  
Jean-Gabriel Young ◽  
Fernanda S. Valdovinos ◽  
M. E. J. Newman

Empirical measurements of ecological networks such as food webs and mutualistic networks are often rich in structure but also noisy and error-prone, particularly for rare species for which observations are sparse. Focusing on the case of plant–pollinator networks, we here describe a Bayesian statistical technique that allows us to make accurate estimates of network structure and ecological metrics from such noisy observational data. Our method yields not only estimates of these quantities, but also estimates of their statistical errors, paving the way for principled statistical analyses of ecological variables and outcomes. We demonstrate the use of the method with an application to previously published data on plant–pollinator networks in the Seychelles archipelago, calculating estimates of network structure, network nestedness, and other characteristics.


Author(s):  
Jordi Bascompte ◽  
Pedro Jordano

Mutualisms can involve dozens, even hundreds, of species and this complexity has precluded a serious community-wide approach to plant–animal interactions. The most straightforward way to describe such an interacting community is with a network of interactions. In this approach, species are represented as nodes of two types: plants and animals. This chapter provides the tools and concepts for characterizing mutualistic networks and placing them into a broad context. This serves as a background with which to understand the structure of mutualistic networks. The discussions cover a network approach to complex systems, measures of network structure, models of network buildup, and ecological networks.


2014 ◽  
Vol 281 (1780) ◽  
pp. 20132397 ◽  
Author(s):  
Jeferson Vizentin-Bugoni ◽  
Pietro Kiyoshi Maruyama ◽  
Marlies Sazima

Understanding the relative importance of multiple processes on structuring species interactions within communities is one of the major challenges in ecology. Here, we evaluated the relative importance of species abundance and forbidden links in structuring a hummingbird–plant interaction network from the Atlantic rainforest in Brazil. Our results show that models incorporating phenological overlapping and morphological matches were more accurate in predicting the observed interactions than models considering species abundance. This means that forbidden links, by imposing constraints on species interactions, play a greater role than species abundance in structuring the ecological network. We also show that using the frequency of interaction as a proxy for species abundance and network metrics to describe the detailed network structure might lead to biased conclusions regarding mechanisms generating network structure. Together, our findings suggest that species abundance can be a less important driver of species interactions in communities than previously thought.


2006 ◽  
Vol 69 (1) ◽  
pp. 119-133 ◽  
Author(s):  
Ken Arii ◽  
Raphaëlle Derome ◽  
Lael Parrott
Keyword(s):  

2018 ◽  
Vol 87 (4) ◽  
pp. 1160-1171 ◽  
Author(s):  
David H. Hembry ◽  
Rafael L. G. Raimundo ◽  
Erica A. Newman ◽  
Lesje Atkinson ◽  
Chang Guo ◽  
...  

2013 ◽  
Author(s):  
Timothée Poisot ◽  
Dominique Gravel

Connectance and degree distributions are important components of the structure of ecological networks. In this contribution, we use a statistical argument and simple network generating models to show that properties of the degree distribution are driven by network connectance. We discuss the consequences of this finding for (1) the generation of random networks in null-model analyses, and (2) the interpretation of network structure and ecosystem properties in relationship with degree distribution.


2004 ◽  
Vol 273 ◽  
pp. 291-302 ◽  
Author(s):  
JA Dunne ◽  
RJ Williams ◽  
ND Martinez

Ecology ◽  
2015 ◽  
Vol 96 (1) ◽  
pp. 291-303 ◽  
Author(s):  
Sonia Kéfi ◽  
Eric L. Berlow ◽  
Evie A. Wieters ◽  
Lucas N. Joppa ◽  
Spencer A. Wood ◽  
...  

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