*****  To join INSNA, visit  *****

from finally-warm southern calfiornia on hoiday break

   Barry Wellman

    A vision is just a vision if it's only in your head
    Step by step, link by link, putting it together
   NetLab Network                 FRSC                      INSNA Founder           twitter: @barrywellman
   NETWORKED: The New Social Operating System  Lee Rainie & Barry Wellman

---------- Forwarded message ----------
Date: Mon, 13 Feb 2017 12:05:34 +0000
From: "[utf-8] Complexity Digest" <[log in to unmask]>
Reply-To: [log in to unmask]
To: "[utf-8] Barry" <[log in to unmask]>
Subject: [utf-8] Latest Complexity Digest Posts

Learn about the latest and greatest related to complex systems research. More at

A theoretical foundation for multi-scale regular vegetation patterns

Empirically validated mathematical models show that a combination of intraspecific competition between subterranean social-insect colonies and scale-dependent feedbacks between plants can explain the spatially periodic vegetation patterns observed in many landscapes, such as the Namib Desert ˙˙fairy circles˙˙.

A theoretical foundation for multi-scale regular vegetation patterns

Corina E. Tarnita, Juan A. Bonachela, Efrat Sheffer, Jennifer A. Guyton, Tyler C. Coverdale, Ryan A. Long & Robert M. Pringle

Nature 541, 398˙˙401 (19 January 2017) doi:10.1038/nature20801

Source: (

Postdoctoral position in Big Data and Data Science

    We are looking for a highly motivated postdoctoral fellow in the area of Big Data and Data Science with a particular focus on Social Mining within a EU funded project. The project aims to establish a Social Mining and Big Data Ecosystem for ethically sensitive scientific discoveries and advanced applications of social data mining to the various dimensions of social life.
The ideal candidate shall pursue exciting research in the areas of Big Data, social data analytics, machine learning, large-scale networks, deep learning, participatory smart cities platforms, and/or in connection with the platform.

Source: (

University of Sydney ˙˙ Postdoctoral Research Associate ˙˙ Student Interactions

    The Postdoctoral Research Associate will conduct a longitudinal and a cross-sectional analysis of large-scale data of student interactions. The primary purpose of the network analysis is to cast light on the social and cultural landscape of the Universitys student body. The results will inform the targeting of network interventions.

The successful person will work closely with Dr. Petr Matous, Prof Philippa Pattison (Deputy Vice-Chancellor for Education), and Prof. Shane Houston (Deputy Vice-Chancellor for Indigenous Strategy and Services).

Source: (

Fundamental limitations of network reconstruction from temporal data

    Inferring properties of the interaction matrix that characterizes how 
nodes in a networked system directly interact with each other is a 
well-known network reconstruction problem. Despite a decade of extensive 
studies, network reconstruction remains an outstanding challenge. The 
fundamental limitations governing which properties of the interaction 
matrix (e.g. adjacency pattern, sign pattern or degree sequence) can be 
inferred from given temporal data of individual nodes remain unknown. 
Here, we rigorously derive the necessary conditions to reconstruct any 
property of the interaction matrix. Counterintuitively, we find that 
reconstructing any property of the interaction matrix is generically as 
difficult as reconstructing the interaction matrix itself, requiring 
equally informative temporal data. Revealing these fundamental limitations 
sheds light on the design of better network reconstruction algorithms that 
offer practical improvements over existing methods.

Fundamental limitations of network reconstruction from temporal data
Marco Tulio Angulo, Jaime A. Moreno, Gabor Lippner, Albert-László Barabási, Yang-Yu Liu

JRS Interface

February 2017
Volume 14, issue 127

Source: (

Ecosystem restoration strengthens pollination network resilience and functions.

Land degradation results in declining biodiversity and the disruption of 
ecosystem functioning worldwide, particularly in the tropics1. Vegetation 
restoration is a common tool used to mitigate these impacts and 
increasingly aims to restore ecosystem functions rather than species 
diversity2. However, evidence from community experiments on the effect of 
restoration practices on ecosystem functions is scarce3. Pollination is an 
important ecosystem function and the global decline in pollinators 
attenuates the resistance of natural areas and agro-environments to 
disturbances4. Thus, the ability of pollination functions to resist or 
recover from disturbance (that is, the functional resilience)5, 6 may be 
critical for ensuring a successful restoration process7. Here we report 
the use of a community field experiment to investigate the effects of 
vegetation restoration, specifically the removal of exotic shrubs, on 
pollination. We analyse 64 plant˙˙pollinator networks and the reproductive 
performance of the ten most abundant plant species across four restored 
and four unrestored, disturbed mountaintop communities. Ecosystem 
restoration resulted in a marked increase in pollinator species, visits to 
flowers and interaction diversity. Interactions in restored networks were 
more generalized than in unrestored networks, indicating a higher 
functional redundancy in restored communities. Shifts in interaction 
patterns had direct and positive effects on pollination, especially on the 
relative and total fruit production of native plants. Pollinator 
limitation was prevalent at unrestored sites only, where the proportion of 
flowers producing fruit increased with pollinator visitation, approaching 
the higher levels seen in restored plant communities. Our results show 
that vegetation restoration can improve pollination, suggesting that the 
degradation of ecosystem functions is at least partially reversible. The 
degree of recovery may depend on the state of degradation before 
restoration intervention and the proximity to pollinator source 
populations in the surrounding landscape5, 8. We demonstrate that network 
structure is a suitable indicator for pollination quality, highlighting 
the usefulness of interaction networks in environmental management6, 9.

Source: (

Complex Networks 2017

The International Conference on Complex Networks and their Applications aims at bringing together researchers from different scientific communities working on areas related to complex networks.

Two types of contributions are welcome: theoretical developments arising from practical problems, and case studies where methodologies are applied. Both contributions are aimed at stimulating the interaction between theoreticians and practitioners.

The 6th International Conference on Complex Networks and Their Applications
November 29 - December 01 2017
Lyon, France

Source: (

The Role of Population Games and Evolutionary Dynamics in Distributed Control Systems: The Advantages of Evolutionary Game Theory

    Recently, there has been an increasing interest in the control community in studying large-scale distributed systems. Several techniques have been developed to address the main challenges for these systems, such as the amount of information needed to guarantee the proper operation of the system, the economic costs associated with the required communication structure, and the high computational burden of solving for the control inputs for largescale systems.

Source: (

Sponsored by the Complex Systems Society.
Founding Editor: Gottfried Mayer.
Editor-in-Chief: Carlos Gershenson.

You can contribute to Complexity Digest selecting one of our topics ( ) and using the "Suggest" button.

SOCNET is a service of INSNA, the professional association for social
network researchers ( To unsubscribe, send
an email message to [log in to unmask] containing the line
UNSUBSCRIBE SOCNET in the body of the message.