A Model for the Spatial Dynamics of Linyphiid Spiders in Farmland

Halley, John M.; Thomas, C. F. G.; Jepson, P. C.

doi:10.2307/2404978

Cited by 97 publications

(97 citation statements)

References 23 publications

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“…It is observed analytically that the death rates play an important role for the extinction thresholds. Halley et al [5] observed that high mobility of spiders allows them to escape temporary lethal events by dispersing into refugia. So, in numerical simulations the focus will also be on these two factors, i.e, spider dispersal through ballooning and the presence of woods, on the dynamics of our system.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Mathematical modelling of the spider population in an agroecosystem has been considered in [5], where specifically a model for spider dispersal in a heterogeneous agricultural landscape is formulated and simulated. The findings demonstrate that the landscape heterogeneity plays a crucial role for survival and abundance of its populations.…”

Section: Introductionmentioning

confidence: 99%

“…The application of current ecological knowledge and technology has to be furthered in applied research, by means of modelling and field experiments, to solve the pest problem. The need of accurate simulations for the prediction of any long term effect of large scale pesticide has been particularly addressed in [4] and [5].…”

Section: Introductionmentioning

confidence: 99%

“…Namely, we consider the woods nearby the fields as refugia for the spiders, especially at the times when the fields are sprayed with insecticide. A distinguishing feature of this model compared to [5] is avoidance of using the diffusion equation as basic model, which is mathematically more complex to handle than a simple dynamical system. Nevertheless, in spite of not explicitly building space in the model, we are still able to include in our description the dispersal of the spiders by ballooning.…”

Section: Introductionmentioning

confidence: 99%

“…Another feature of the present study consists in partitioning the prey among insects, harmless from the farmer's viewpoint, living in both woods and cultivated land, and pests, whose habitat is only the latter, harmful to crops. As in [5], we also take into account the human intervention through pesticides spraying.…”

Section: Introductionmentioning

confidence: 99%

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Spiders as biological controllers in the agroecosystem

Chatterjee

Isaia

Venturino

2009

Journal of Theoretical Biology

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In this paper we propose a general model consisting of insects, pests and spiders interacting in an agroecosystem included in a typical homogeneous rural landscape, characterized by a continuous mosaic of cultivated land and a few small patches of grasslands and small woods bounding the fields. The model is general enough to show all the phenomena observed in the agroecosystem. The role of the spider population as a biological controller in the agroecosystem is particularly emphasized. Human intervention by means of pesticide spraying and its relationship with the biological pest controllers is also accounted for.

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spiders as biological controllers in the agroecosystem

Chatterjee

Isaia

Venturino

2009

Journal of Theoretical Biology

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Effects of mowing on body size patterns in spider assemblages of mesic meadows

Stański,

Stańska,

Hajdamowicz

et al. 2024

Ecology and Evolution

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Habitat disturbance affects not only the abundance, species richness and species composition of the local fauna, but also the body size of specific individuals and body size patterns in animal assemblages. Particularly large disturbances occur in agroecosystems, where many agricultural treatments are carried out. One of them, which is most commonly applied to grasslands and which significantly damages the habitat structure, is mowing. We examined the effect of mowing on mean, skewness and kurtosis of the body size in epigeic spider assemblages. The research was conducted on mesic meadows in eastern Poland, in an agricultural landscape typical for this region, consisting of a mosaic of meadows, fields and forests. Spiders were collected using pitfall traps in two sampling periods: the first before mowing and the second when part of the meadows had been mown. Mowing had no significant effect on mean body size, skewness and kurtosis of the body size in epigeic spider assemblages. However, after the cut, mown plots showed, on average, significantly smaller spider species than unmown plots. Both the value of skewness and kurtosis significantly increased after mowing but to the same extent on both the control and mown plots. The decrease in mean body size and increase in skewness in spider assemblages were mainly due to an increase in the number of small species from the Linyphiidae family. It is likely that these species began to migrate (via ballooning) during the second sampling session, following the start of haying, and were thus caught in traps more frequently. Our study showed no clear, significant changes in the body size structure of epigeic spiders in mown meadows compared to unmown ones, which may suggest that the mowing, where extensive farming is practised, does not have a long‐term significant negative impact on this group of invertebrates.

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The Role of Source‐Sink Dynamics in the Assessment of Risk to Nontarget Arthropods from the Use of Plant Protection Products

Lewis

Dinter²,

Elston

et al. 2021

Enviro Toxic and Chemistry

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The concept of source-sink dynamics as a potentially important component of metapopulation dynamics was introduced in the 1980's. The objective of this paper is to review the considerable body of work that has been developed to consider its theoretical implications as well as to understand how source-sink dynamics may manifest under field conditions to the specific case of non-target arthropods in the This article is protected by copyright. All rights reserved. Accepted Articleagricultural environment. Our review concludes that metapopulation dynamics based on field observations are often far more complex than existing theoretical source-sink models would indicate as they are dependent on numerous population processes and influencing factors. The difficulty to identify and measure these factors likely explains why empirical studies assessing source-sink dynamics are scarce. Further, the importance in considering the spatial and temporal heterogeneity of agricultural landscapes when assessing the population dynamics of non-target arthropods in the context of the risk from the use of plant protection products is highlighted. A need is identified to further develop and thoroughly validate predictive population models, which can incorporate all factors relevant for a specific system. Once reliable predictive models for a number of representative non-target arthropod species are available, they could provide a meaningful tool for refined risk evaluations (higher tier level risk assessment), addressing specific concerns identified at the initial evaluation stages (lower tier level risk assessment).

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A Model for the Spatial Dynamics of Linyphiid Spiders in Farmland

Cited by 97 publications

References 23 publications

Spiders as biological controllers in the agroecosystem

Spiders as biological controllers in the agroecosystem

Effects of mowing on body size patterns in spider assemblages of mesic meadows

The Role of Source‐Sink Dynamics in the Assessment of Risk to Nontarget Arthropods from the Use of Plant Protection Products

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