Behavioral responses to resource heterogeneity can accelerate biological invasions

Lutscher, Frithjof; Musgrave, Jeffrey

doi:10.1002/ecy.1773

Cited by 27 publications

(32 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Drawing from diffusion theory, which predicts lower population densities in land cover that facilitates movement (Schultz et al 2017), it seems that in our system impervious cover and associated features of the urban environment favor site infidelity of individuals to the garden system. Many (possibly most) organisms move faster in the landscape matrix than in habitat patches (Kareiva and Odell 1987;Schultz 1998;Brown et al 2017;Lutscher and Musgrave 2017), attributed in part to edge effects. In low quality cityscapes with greater impervious habitat, individuals are more likely to come upon an edge, thereby triggering long range movement to the next high quality patch.…”

Section: Discussionmentioning

confidence: 99%

Cityscape quality and resource manipulation affect natural enemy biodiversity in and fidelity to urban agroecosystems

et al. 2018

View full text Add to dashboard Cite

Context Complex landscapes with high resource availability can support more diverse natural enemy communities and better natural pest control by providing resources and facilitating organism dispersal. Moreover, in agricultural landscapes, local agroecosystem management can support biodiversity maintenance and pest control by adding resources in less complex landscapes with fewer resources. However, we lack an understanding of how local and landscape factors interact to affect natural enemy communities and their site fidelity to agroecosystems in urban landscapes (i.e., cityscapes). Objective To better understand how local and landscape factors influence natural enemies in urban agroecosystems, we used urban community gardens as a model system to test if and how local resource manipulation and differences in cityscape quality affect natural enemy (ladybird beetles, parasitoid wasps) communities and their fidelity to urban habitats. Methods We performed two manipulations. First, we added local floral resources in 6 of 12 gardens situated in different cityscapes to measure differences in natural enemy biodiversity. Second, in those 12 gardens, with and without resource additions, we manipulated populations of a common natural enemy, Hippodamia convergens, to assess fidelity to the gardens. Results Floral resource additions increased parasitoid abundance and changed community composition, but had little effect on ladybeetle abundance, richness or site fidelity. Rather, ladybeetle fidelity to gardens was lower in gardens in low quality cityscapes with high impervious cover. Conclusions Cityscape quality influences natural enemies in and fidelity to gardens. Landscape-moderated biodiversity patterns observed in rural landscapes likely differ from urban contexts with implications for pest control.

show abstract

Section: Discussionmentioning

confidence: 99%

Cityscape quality and resource manipulation affect natural enemy biodiversity in and fidelity to urban agroecosystems

et al. 2018

View full text Add to dashboard Cite

show abstract

“…, Dewhirst and Lutscher , Gilbert et al. , Lutscher and Musgrave ). Theory describes the effects of the amount, arrangement or relative quality of suitable habitat on spread velocity (Shigesada et al.…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence that density dependence strongly influences plant invasions through fragmented landscapes

Williams

Levine

2018

Ecology

View full text Add to dashboard Cite

Populations of range expanding species encounter patches of both favorable and unfavorable habitat as they spread across landscapes. Theory shows that increasing patchiness slows the spread of populations modeled with continuously varying population density when dispersal is not influence by the environment or individual behavior. However, as is found in uniformly favorable landscapes, spread remains driven by fecundity and dispersal from low density individuals at the invasion front. In contrast, when modeled populations are composed of discrete individuals, patchiness causes populations to build up to high density before dispersing past unsuitable habitat, introducing an important influence of density dependence on spread velocity. To test the hypothesized interaction between habitat patchiness and density dependence, we simultaneously manipulated these factors in a greenhouse system of annual plants spreading through replicated experimental landscapes. We found that increasing the size of gaps and amplifying the strength of density dependence both slowed spread velocity, but contrary to predictions, the effect of amplified density dependence was similar across all landscape types. Our results demonstrate that the discrete nature of individuals in spreading populations has a strong influence on how both landscape patchiness and density dependence influence spread through demographic and dispersal stochasticity. Both finiteness and landscape structure should be critical components to theoretical predictions of future spread for range expanding native species or invasive species colonizing new habitat.

show abstract

“…This is largely due to the fact that alien species must negotiate a number of barriers to become established and invasive in new habitats (Hui and Richardson ), while recurrence only reflects population compensation after experiencing low population levels from environmental fluctuations and/or eradication (Manrakhan et al. , Lutscher and Musgrave , Hausch et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Stowaways are directly associated with transportation but arrive independently from specific commodity/contaminant. The air corridor pathway highlights the role that transport infrastructures play in the re‐introduction of alien species (Lutscher and Musgrave ). Trajectory II depicts partial success in infested cells but without recurrences, which could indicate the effectiveness of the EEP in these cells.…”

Section: Discussionmentioning

confidence: 99%

“…3a). This is largely due to the fact that alien species must negotiate a number of barriers to become established and invasive in new habitats (Hui and Richardson 2017), while recurrence only reflects population compensation after experiencing low population levels from environmental fluctuations and/or eradication (Manrakhan et al 2015, Lutscher and Musgrave 2017, Hausch et al 2018. Nonetheless, infested populations can serve as the propagule source to the invasion of other empty cells, while the sub-detectable population after successful eradication programs can also serve as propagule reservoirs for recurrent invasions (Bennett et al 2013, Baker et al 2017; both make EEP challenging and arbitrary (Liebhold and Tobin 2008, Ekesi et al 2016.…”

Section: Invasion Prevalence and Riskmentioning

confidence: 99%

See 1 more Smart Citation

The failure of success: cyclic recurrences of a globally invasive pest

Zhao

Hui

Plant

et al. 2019

Ecological Applications

View full text Add to dashboard Cite

In the six decades since 1960, the oriental fruit fly, Bactrocera dorsalis (Hendel), has been announced successfully eradicated in California by the U.S. Department of Agriculture a total of 564 times. This includes eradication declarations in one city a total of 25 different years, in 12 cities 8-19 different years, and in 101 cities 2-7 different years. We here show that the false negatives in declaring elimination success hinge on the easily achieved regulatory criteria, which have virtually guaranteed the failure of complete extirpation of this pest. Analyses of the time series of fly detection over California placed on a grid of 100-km 2 cells revealed (1) partial success of the eradication program in controlling the invasion of the oriental fruit fly; (2) low prevalence of the initial detection in these cells is often followed by high prevalence of recurrences; (3) progressively shorter intervals between years of consecutive detections; and (4) high likelihood of early-infested cells also experiencing the most frequent outbreaks. Facing the risk of recurrent invasions, such short-term eradication programs have only succeeded annually according to the current regulatory criteria but have failed to achieve the larger goal of complete extirpation of the oriental fruit fly. Based on the components and running costs of the current programs, we further estimated the efficiency of eradication programs with different combinations of eradication radius, duration, and edge impermeability in reducing invasion recurrences and slowing the spread of the oriental fruit fly. We end with policy implications including the need for agricultural agencies worldwide to revisit eradication protocols in which monitoring and treatments are terminated when the regulatory criteria for declaring eradication are met. Our results also have direct implications to invasion biologists and agriculture policy makers regarding long-term risks of short-term expediency.

show abstract

Behavioral responses to resource heterogeneity can accelerate biological invasions

Cited by 27 publications

References 48 publications

Cityscape quality and resource manipulation affect natural enemy biodiversity in and fidelity to urban agroecosystems

Cityscape quality and resource manipulation affect natural enemy biodiversity in and fidelity to urban agroecosystems

Experimental evidence that density dependence strongly influences plant invasions through fragmented landscapes

The failure of success: cyclic recurrences of a globally invasive pest

Contact Info

Product

Resources

About