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
Keyword(s):  
Food Webs ◽  
Network Structure ◽  
Ecological Network ◽  
Mutualistic Networks

scholarly journals Reconstruction of plant–pollinator networks from observational data

2019 ◽  
Author(s):  
Jean-Gabriel Young ◽  
Fernanda S. Valdovinos ◽  
M. E. J. Newman
Keyword(s):  
Food Webs ◽  
Observational Data ◽  
Network Structure ◽  
Rare Species ◽  
Statistical Technique ◽  
Ecological Networks ◽  
Statistical Analyses ◽  
Published Data ◽  
Statistical Errors ◽  
Plant Pollinator

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.

An Introduction to Complex Networks

2013 ◽  
Author(s):  
Jordi Bascompte ◽  
Pedro Jordano
Keyword(s):  
Complex Systems ◽  
Complex Networks ◽  
Network Structure ◽  
Ecological Networks ◽  
Broad Context ◽  
Network Approach ◽  
Mutualistic Networks ◽  
Plant Animal Interactions

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.

scholarly journals Processes entangling interactions in communities: forbidden links are more important than abundance in a hummingbird–plant network

2014 ◽  
Vol 281 (1780) ◽  
pp. 20132397 ◽  
Author(s):  
Jeferson Vizentin-Bugoni ◽  
Pietro Kiyoshi Maruyama ◽  
Marlies Sazima
Keyword(s):  
Network Structure ◽  
Species Interactions ◽  
Species Abundance ◽  
Interaction Network ◽  
Atlantic Rainforest ◽  
Relative Importance ◽  
Ecological Network ◽  
Plant Interaction ◽  
Multiple Processes ◽  
Network Metrics

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.

Examining the potential effects of species aggregation on the network structure of food webs

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

scholarly journals Does biological intimacy shape ecological network structure? A test using a brood pollination mutualism on continental and oceanic islands

2018 ◽  
Vol 87 (4) ◽  
pp. 1160-1171 ◽  
Author(s):  
David H. Hembry ◽  
Rafael L. G. Raimundo ◽  
Erica A. Newman ◽  
Lesje Atkinson ◽  
Chang Guo ◽  
...  
Keyword(s):  
Network Structure ◽  
Oceanic Islands ◽  
Ecological Network ◽  
Pollination Mutualism

scholarly journals When is an ecological network complex? Connectance drives degree distribution and emerging network properties

2013 ◽  
Author(s):  
Timothée Poisot ◽  
Dominique Gravel
Keyword(s):  
Network Structure ◽  
Degree Distribution ◽  
Null Model ◽  
Random Networks ◽  
Ecological Network ◽  
Ecosystem Properties ◽  
Network Properties ◽  
Statistical Argument ◽  
Simple Network ◽  
Network Complex

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.

scholarly journals Network structure and robustness of marine food webs

2004 ◽  
Vol 273 ◽  
pp. 291-302 ◽  
Author(s):  
JA Dunne ◽  
RJ Williams ◽  
ND Martinez
Keyword(s):  
Food Webs ◽  
Network Structure ◽  
Marine Food Webs ◽  
Marine Food

Network structure beyond food webs: mapping non‐trophic and trophic interactions on Chilean rocky shores

Ecology ◽  
2015 ◽  
Vol 96 (1) ◽  
pp. 291-303 ◽  
Author(s):  
Sonia Kéfi ◽  
Eric L. Berlow ◽  
Evie A. Wieters ◽  
Lucas N. Joppa ◽  
Spencer A. Wood ◽  
...  
Keyword(s):  
Food Webs ◽  
Network Structure ◽  
Trophic Interactions ◽  
Rocky Shores
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