Propagation of local interactions create global gap structure and dynamics in a tropical rainforest

Pagnutti, Christopher; Azzouz, Mohamed; Anand, Madhur

doi:10.1016/j.jtbi.2007.02.012

Cited by 10 publications

(7 citation statements)

References 41 publications

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“…The fact that the scaling properties of forest spatial distribution over time is important, as it implies that a simple model could describe the spatial-temporal complexity of landscape evolution (Bolliger et al, 2003). This then suggests that simple rules could be used to model forest dynamics as has been suggested also in other studies (Colasanti et al, 2007;Pagnutti et al, 2007;Sturtevant et al, 2004). Most of the dominant species are dispersed by wind (i.e.…”

Section: Discussionmentioning

confidence: 90%

“…The power law is usually related to selfsimilar (fractal) structures in nature (Harte et al, 1999;Ostling et al, 2004;Zhang et al, 2006). The distribution of species, populations and communities in forest landscapes have been shown to have power-law related fractal properties (Borda-de-Água et al, 2002;Weishampel, 2000, 2001;Enquist et al, 2009;Harte et al, 1999;Ostling et al, 2004;Pagnutti et al, 2007;Scheuring and Riedi, 1994;West et al, 2009;Zhang et al, 2006) and thus some hope for generalizability of these patterns still exist.…”

Section: Introductionmentioning

confidence: 99%

“…Recently several studies have examined the processes generate power-laws in vegetation patch patterns using simple cellular automata type models of growth dynamics (Kéfi et al, 2007;Pagnutti et al, 2007;Scanlon et al, 2007). These models have all pointed to the importance of local interactions for generating observed power-laws in landscape patterns.…”

Section: Introductionmentioning

confidence: 99%

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Multifractal pattern and process during a recent period of forest expansion in a temperate mountainous region of China

Zhang¹,

Ma²,

Anand³

et al. 2011

Ecological Informatics

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a b s t r a c t a r t i c l e i n f oUnderstanding the mechanisms that drive spatial pattern change over space and time is a central goal of landscape ecology, but these patterns are often complex. Multifractals, an extension of the concept of fractal geometry, is especially suited to the description of complex pattern. In our paper, we examine the scaling properties of forest spatial pattern over 32 years of forest expansion in a warm temperate deciduous forest near Beijing city using multifractal analysis. An idealized fractal growth model was used to simulate spatial patterns and to link patterns to processes. We show that the despite substantial increases in forest cover, the scaling properties of the spatial pattern of the forest landscape remains similar over time. The variance of Rényi spectra among different years implied that the changes in the forest landscape over time may be a fractal growth process. The fact that these scaling behaviors persist across a heterogeneous landscape suggests that simple rules could exist for some processes of forest expansion, facilitating prediction and further modeling efforts.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multifractal pattern and process during a recent period of forest expansion in a temperate mountainous region of China

Zhang¹,

Ma²,

Anand³

et al. 2011

Ecological Informatics

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“…I suspect that in a century of filmmaking practice, the local changes propagated locally, iteratively affecting nearby scenes, passing on their local constraints until a stable global pattern emerged. Such a process has been suggested in many domains of science, from vision (Saarinen, Levi, & Shen, 1997) to ecology (Pagnutti, Azzouz, & Anand, 2007). …”

Section: Discussionmentioning

confidence: 99%

The evolution of pace in popular movies

Cutting

2016

Cogn. Research

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Movies have changed dramatically over the last 100 years. Several of these changes in popular English-language filmmaking practice are reflected in patterns of film style as distributed over the length of movies. In particular, arrangements of shot durations, motion, and luminance have altered and come to reflect aspects of the narrative form. Narrative form, on the other hand, appears to have been relatively unchanged over that time and is often characterized as having four more or less equal duration parts, sometimes called acts – setup, complication, development, and climax. The altered patterns in film style found here affect a movie’s pace: increasing shot durations and decreasing motion in the setup, darkening across the complication and development followed by brightening across the climax, decreasing shot durations and increasing motion during the first part of the climax followed by increasing shot durations and decreasing motion at the end of the climax. Decreasing shot durations mean more cuts; more cuts mean potentially more saccades that drive attention; more motion also captures attention; and brighter and darker images are associated with positive and negative emotions. Coupled with narrative form, all of these may serve to increase the engagement of the movie viewer.

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“…More generally, real ecosystems will experience a combination of disturbances with various characteristics: target species (particularly when considering pest outbreaks), intensity, frequency, and/or extent (Pham et al 2004). It would then be interesting to include in the model approaches that account for the variety of processes (see Pagnutti et al 2007 for a simulation study on gap size distribution). However, disturbances are a difficult component to integrate in models (as experimental data are often lacking), and making headway in this field requires a strong modeling effort.…”

Section: Disturbancesmentioning

confidence: 99%

Interactions between climate change, competition, dispersal, and disturbances in a tree migration model

2008

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Potentially significant shifts in the geographical patterns of vegetation are an expected result of climate change. However, the importance of local processes (e.g., dispersal, competition, or disturbance) has been often ignored in climate change modeling. We develop an individual-based simulation approach to assess how these mechanisms affect migration rate. We simulate the northward progression of a theoretical tree species when climate change makes northern habitat suitable. We test how the rate of progression is affected by (1) competition with a resident species, (2) interactions with disturbance regimes, (3) species dispersal kernel, and (4) the intensity of climate change over time. Results reveal a strong response of species' expansion rate to the presence of a local competitor, as well as nonlinear effects of disturbance. We discuss these results in light of current knowledge of northern forest dynamics and results found in the climatic research literature.

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Propagation of local interactions create global gap structure and dynamics in a tropical rainforest

Cited by 10 publications

References 41 publications

Multifractal pattern and process during a recent period of forest expansion in a temperate mountainous region of China

Multifractal pattern and process during a recent period of forest expansion in a temperate mountainous region of China

The evolution of pace in popular movies

Interactions between climate change, competition, dispersal, and disturbances in a tree migration model

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