Vegetation architecture and redistribution of insects moving on the plant surface

Hannunen, Salla

doi:10.1016/s0304-3800(02)00125-4

Cited by 15 publications

(16 citation statements)

References 24 publications

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“…At 0.5 probability for each direction at a crossroads, successive crossroads along the aphid pathway will then result in a very low probability of reaching a topologically distant shoot, without counting increased travel time due to unsuccessful forward and backward movements along the branch. Patterns of connectivity (Hannunen 2002;Randlkofer et al 2010) seen as the measure of physical contacts between shoots may also interfere although not under focus in our study. The theory of dendritic networks applied to population dynamics (Campbell Grant et al 2007) may help to represent the within-branch movement and colonisation of aphids, and the significance of shoots, subbranches and crossroads (nodes).…”

Section: Discussionmentioning

confidence: 85%

Aphids at crossroads: when branch architecture alters aphid infestation patterns in the apple tree

Simon¹,

Morel²,

Durand³

et al. 2011

Trees

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UMR 1334 AGAP : Equipe AFEF ‘Architecture et Fonctionnement des Espèces fruitières’ ; Team AFFS ‘Architecture and Functioning of Fruit Species’ Contact: Sylvaine.Simon@avignon.inra.frPublication Inra prise en compte dans l'analyse bibliométrique des publications scientifiques mondiales sur les Fruits, les Légumes et la Pomme de terre. Période 2000-2012. http://prodinra.inra.fr/record/256699Plant architecture highly constrains pest infestation but is rarely considered in studies on plant–insect interactions. We analysed the relationships between apple tree architectural traits manipulated by tree training and within-branch development of Dysaphis plantaginea (rosy apple aphid, RAA),a major apple pest,during its multi- plication wingless phase in spring. We hypothesised that the degree of branching had an effect on RAA within-branch estation. In an experimental apple orchard, the infestation by aphid wingless forms was surveyed in two consecutive spring seasons within branches manipulated to design contrasted architectures differing in shoot numbers, shoot density and branching orders. Whatever the branch management system, aphid infestation was higher on long versus short, fruiting versus vegetative, and growing versus non-growing shoots. Either less infested shoots or less severe infestation were observed in the most branched system. A pattern of within-branch short-distance infestation was conﬁrmed. Moreover, the number of branching points between two shoots exerted a high constraint on this infestation pattern. Beside possible trophic effects due to plant growth patterns already documented in the literature, a high degree of branching is likely to be a key-architectural trait to constrain within-branch aphid infestation. This opens new perspectives on the manipulation of branch architecture as a mean giving partial control of pests towards sustainable fruit production

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Section: Discussionmentioning

confidence: 85%

Aphids at crossroads: when branch architecture alters aphid infestation patterns in the apple tree

Simon¹,

Morel²,

Durand³

et al. 2011

Trees

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“…If a real boundary effect were mediated by a difference in height at the patch-matrix interface then permeability would be almost zero above the matrix vegetation and greater at lower heights. To incorporate these effects, three-dimensional models accounting for plant architecture are required (Hannunen 2002), although representing the landscape in this way is computationally more challenging.…”

Section: Discussionmentioning

confidence: 99%

“…This would also apply if the altered structure of the plots upon which we recorded movement paths prevented the model's application to the more natural vegetation in the field. However, since tansy beetles move on dense vegetation with few non-connecting structures, they should have a high degree of control over their movement (Hannunen 2002) so this may be of little importance. Indeed, Goodwin and Fahrig (2002) found that although the goldenrod beetle Trirhabda borealis moved differently in different matrix environments, matrix elements only had a small influence on landscape connectivity compared to habitat patches.…”

Section: Discussionmentioning

confidence: 99%

Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour

2007

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Movement underpins animal spatial ecology and is often modelled as habitat-dependent correlated random walks. Here, we develop such a model for the flightless tansy leaf beetle Chrysolina graminis moving within and between patches of its host plant tansy Tanacetum vulgare. To parameterize the model, beetle movement paths on timescales of minutes were observed in uniform plots of tansy and inter-patch matrix (meadow) vegetation. Movement lasted longer, covered greater distances and had narrower turning angles in the matrix. Simulations of the model emulated an independent two-season multi-patch mark-resight study at daily timescales and included variable boundary-mediated behaviour affecting the probability of leaving habitat patches. As boundaries in the model became stronger there were disproportionately large decreases in net displacements, inter-patch movements and the proportion of beetles in the matrix. The model produced realistic patterns of population-level displacement over periods up to 13 days with fully permeable boundaries for one dataset and strong boundaries for the other. This may be explained by the heights of the tansy patches in each study, as beetles will be unable to cross the boundary near the top of a patch that emerges from the matrix. The simulations demonstrate the important effects of boundary behaviour on displacement patterns and indicate temporal and spatial variability in permeability. Realistic models of movement must therefore include behaviour at habitat boundaries.

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“…Now, comb-like models are widely employed to describe various experimental applications. These models have proven useful to describe the transport along spiny dendrites [13,14], percolation clusters with dangling bonds [11], diffusion of drugs in the circulatory system [15], energy transfer in comb polymers [6,7] and dendritic polymers [8], diffusion in porous materials [16][17][18], the influence of vegetation architecture on the diffusion of insects on plant surfaces [19], and many other interdisciplinary applications. Random walks on comb structures provide a geometrical explanation of anomalous diffusion.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic description of random walks on combs

et al. 2015

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Combs are a simple caricature of various types of natural branched structures, which belong to the category of loopless graphs and consist of a backbone and branches. We study continuous time random walks on combs and present a generic method to obtain their transport properties. The random walk along the branches may be biased, and we account for the effect of the branches by renormalizing the waiting time probability distribution function for the motion along the backbone. We analyze the overall diffusion properties along the backbone and find normal diffusion, anomalous diffusion, and stochastic localization (diffusion failure), respectively, depending on the characteristics of the continuous time random walk along the branches.

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Vegetation architecture and redistribution of insects moving on the plant surface

Cited by 15 publications

References 24 publications

Aphids at crossroads: when branch architecture alters aphid infestation patterns in the apple tree

Aphids at crossroads: when branch architecture alters aphid infestation patterns in the apple tree

Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour

Mesoscopic description of random walks on combs

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