Interactions between frequency and size of disturbance affect competitive outcomes

Miller, Adam D.; Reilly, Dan; Bauman, Spenser; Shea, Katriona

doi:10.1007/s11284-012-0954-4

Cited by 28 publications

(25 citation statements)

References 26 publications

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“…As such it has many facets and the number of papers devoted to the subject is enormous. There are many papers discussing the competition -colonisation trade-off (2-6), role of heterogeneity of space (1,7,8), various type of disturbance, such as fire, flooding or grazing (9)(10)(11) or tolerance-fecundity trade-off (12). Pairwise (PW) experiments of annual plants have been reported by Goldberg and Fleetwood (13), where the effect of the presence of the nearest neighbouring plants has been studied and the plant types differed in many aspects.…”

Section: Introductionmentioning

confidence: 99%

Role of tolerance to resource demand - supply mismatch in a model of annual plants

Droz

Pękalski

2017

Plant Sci. Today

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We propose and discuss a simulation model of annual plants competing for a single resource. Plants are characterised by their tolerance to a surplus of this resource and the maximum number of seeds a plant can produce in a year. Interaction among plants is reduced to blocking a part of the resource by the plant's nearest neighbours. Spatial and temporal conditions are homogeneous. There are no trade-off mechanisms nor immigrants. Plants may suffer from both a lack and too much of the resource. We consider two systems -plants of one type (target plants) and a mixture of two types, where the second type differs from the target ones only by the tolerance to surplus of the resource. We show how the life cycle of a plant depends on its tolerance, on supply of the resource and on how it is affected by the presence of the second type of annuals. We demonstrate that even in such a simple system coexistence of the two species is possible, and we determine the conditions for this. We present also a mean field type approach to the problem, showing that the results from simulations and mean field are quite similar. However the mean field approach cannot answer questions concerning spatial arrangement of plants, like possible formation of niches for different types of plant.Keywords: plant dynamics; Monte Carlo simulations; water supply-demand mismatch; annual plants Citation: Droz M, Pękalski A. Role of tolerance to resource demand -supply mismatch in a model of annual plants.

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Section: Introductionmentioning

confidence: 99%

Role of tolerance to resource demand - supply mismatch in a model of annual plants

Droz

Pękalski

2017

Plant Sci. Today

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“…Various hypotheses have been proposed, like heterogeneity of space (Tilman 1994;Chesson 2000;Wilson and Nisbet 1997), flooding, fire or grazing (Roxburgh et al 2004;Miller et al 2012;Seifan et al 2012) as well as the colonisation-competition trade-off (Tilman 1994;Yu and Wilson 2001). The term heterogeneity as given in the biological literature has many meanings (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

Species richness in a model with resource gradient

Droz

Pękalski

2016

Theor Ecol

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In order to study the dependence of the species richness on heterogeneity of the habitat, we introduce an extended model of annual plants which combines the features of the island model and of gradient heterogeneity resources. First, we consider a native population of plants living on a square lattice of linear size L. After equilibration of this native population, seeds of several different species j = 2, ..., k of annual plants invade the system; they compete among themselves and the native ones. The system is exposed to a one-dimensional water gradient, and each species is characterised by a tolerance to a surplus of water, τ (j). We study the influences of the properties of the gradient of the resource (GR) on the species richness (SR) present in the system. We have shown that the relation between GR and SR is not straightforward and that several cases could be distinguished: For a large class of control parameters, SR increases linearly with GR. However, when the values of the control parameters are such as to create wide inhabitable regions, the relation between SR and GR ceases to have a monotonic character. We have also demonstrated that the average species richness as a function of the resource availability has a hump shape. Our results can be simply explained within our model and are in agreement with several previous field and theoretical works.

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“…Rather, the focus of studies exploring the impacts of novel disturbance regimes has typically been with the disturbance components, such as disturbance size and/or timing (e.g. Gibson et al, 2005;Miller et al, 2012;Poff and Allan, 1995). Studies investigating how novel disturbance regimes influence population and community dynamics focus on effects across the entire disturbed habitat (e.g.…”

Section: Introductionmentioning

confidence: 99%

Post-fire spatial heterogeneity alters ground-dwelling arthropod and small mammal community patterns in a desert landscape experiencing a novel disturbance regime

VanTassel

Barrows

Anderson

2015

Biological Conservation

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a b s t r a c tAnthropogenic activities have resulted in novel disturbance regimes which have unknown impacts on biodiversity. A notable example is the establishment of fire regimes in ecosystems that have not historically burned. These new disturbance regimes leave behind a complex spatial matrix with varying patterns of landscape heterogeneity. Research on novel disturbance regimes often ignores remnant vegetation within disturbed habitats, even though landscape variation in a disturbed area can influence population and community dynamics. Our objective was to understand the influence of spatial heterogeneity, characterized by varying levels of isolation and remnant vegetation, within a landscape disturbed by a novel fire regime in the Mojave Desert where wildfire was exceedingly rare to non-existent in this landscape prior to recent times. We found that community patterns of both ground-dwelling arthropods and small mammals varied based on the amount of remnant vegetation and isolation levels within burned habitats. Ground-dwelling arthropod abundance and richness measurements were highest in burned habitats that had remnant long-lived vegetation present, whereas small mammal abundance and richness measurements were highest in continuous expanses of unburned habitat. We also found that the negative impacts of fire on arthropods and small mammal communities in isolated, burned habitats were masked by the presence of long-lived perennial vegetation. Our study highlights the importance of incorporating habitat heterogeneity into future studies of novel disturbance regimes and provides evidence for the utility of restoration plantings in desert ecosystems.

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Interactions between frequency and size of disturbance affect competitive outcomes

Cited by 28 publications

References 26 publications

Role of tolerance to resource demand - supply mismatch in a model of annual plants

Role of tolerance to resource demand - supply mismatch in a model of annual plants

Species richness in a model with resource gradient

Post-fire spatial heterogeneity alters ground-dwelling arthropod and small mammal community patterns in a desert landscape experiencing a novel disturbance regime

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