Steady state of ecosystem flow networks: a comparison between balancing procedures

Allesina, Stefano; Bondavalli, Cristina

doi:10.1016/s0304-3800(03)00075-9

Cited by 72 publications

(34 citation statements)

References 13 publications

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“…The post-perturbation re-balancing followed the methods described by Allesina and Bondavalli (2003) and were carried out using the enaR (Borrett and Lau, 2014) package in R 3.0.3 (R Development Core Team, 2012). We chose a 25% extinction rate because in 2008 approximately one quarter of marine species assessed were listed in threatened categories (Critically Endangered, Endangered or Vulnerable) (Polidoro et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

“…2. Predator-control (top down) dynamics -the webs were rebalanced by keeping outputs constant, using Allesina and Bondavalli (2003) output balancing method, which yields steady-state webs identical to those derived by recipient (predator) controlled simulations (C Kazanci & S Whipple, pers. comm.).…”

Section: Web Name and Citationmentioning

confidence: 99%

“…3. Averaged dynamics -the coefficients were the average of those derived from either controlling inputs or outputs, following the average (AVG) rebalancing method of Allesina and Bondavalli (2003). Whilst this approach successfully rebalances webs, it does not yield balanced webs equivalent to those derived with equal donor-recipient control, which tend to oscillate and rarely achieve steady-state (C Kazanci & S Whipple, pers.…”

Section: Web Name and Citationmentioning

confidence: 99%

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Trophic cascade direction and flow determine network flow stability

Canning

Death

2017

Ecological Modelling

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Section: Methodsmentioning

confidence: 99%

Section: Web Name and Citationmentioning

confidence: 99%

Section: Web Name and Citationmentioning

confidence: 99%

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Trophic cascade direction and flow determine network flow stability

Canning

Death

2017

Ecological Modelling

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“…The core of these trophically-based networks is a food web, but other ecological processes are included and model compartments may represent non-living resource pools such as particulate organic carbon. We applied Allesina and Bondavalli's (2003) AVG2 balancing algorithm to 15 models that were not initially at steady state because this technique tends to generate the least distortion of network properties. This is the same set of models used in several recent network studies (Borrett and Salas, 2010;Borrett and Freeze, 2011;Salas and Borrett, 2011), and the model data are available from http://people.uncw.edu/borretts/research.html.…”

Section: Model Inputmentioning

confidence: 99%

Equivalence of the realized input and output oriented indirect effects metrics in Ecological Network Analysis

Borrett¹,

Freeze²,

Salas³

2011

Ecological Modelling

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A new understanding of the consequences of how ecosystem elements are interconnected is emerging from the development and application of Ecological Network Analysis. The relative importance of indirect effects is central to this understanding, and the ratio of indirect flow to direct flow (I/D) is one indicator of their importance. Two methods have been proposed for calculating this indicator. The unit approach shows what would happen if each system member had a unit input or output, while the realized technique determines the ratio using the observed system inputs or outputs. When using the unit method, the input oriented and output oriented ratios can be different, potentially leading to conflicting results. However, we show that the input and output oriented I/D ratios are identical using the realized method when the system is at steady state. This work is a step in the maturation of Ecological Network Analysis that will let it be more readily testable empirically and ultimately more useful for environmental assessment and management.

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“…It is the author's intention that this should S. Allesina, C. Bondavalli / Environmental Modelling & Software 19 (2004) 337-340facilitate the development of additional packages or the personalization of the existing ones. A few packages are already on-line: ExcelToScor, which converts SCOR text-based files into Excel and vice-versa and WAND Balance, which performs balancing procedures as described in Allesina and Bondavalli (2003).…”

Section: Additional Packagesmentioning

confidence: 99%