Prey Suitability of Galerucella pusilla Eggs for Two Generalist Predators, Coleomegilla maculata and Chrysoperla carnea

Wiebe, Amy P.; Obrycki, John J.

doi:10.1006/bcon.2001.0999

Cited by 14 publications

(9 citation statements)

References 28 publications

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“…Alternatively, we did Þnd that biotic interference slowed population increase of G. calmariensis by up to 3-fold over populations in which predators were excluded. Observations that some wetlands are consistently slow to develop large Galerucella populations (Landis et al 2003, Wiebe andObrycki 2002) suggest that predation may play a role in this situation. Studies that address the inßuence of wetland plant community structure and ßooding regimes on predator communities and alternative prey abundance are needed to further understand the potential impact of biotic interference on G. calmariensis.…”

Section: Discussionmentioning

confidence: 99%

“…Successfully mated females oviposit, and the resulting larvae must survive to adulthood to colonize the patch. Wiebe and Obrycki (2002) found that Chrysoperla carnea (Stephens) and C. maculata, both common generalist predators in Iowa wetlands, consumed and could complete development on G. pusilla eggs. They suggested that predation may partially explain the low populations of G. pusilla observed in some Iowa wetlands.…”

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confidence: 99%

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Arthropod Predators of <I>Galerucella calmariensis</I> L. (Coleoptera: Chrysomelidae): An Assessment of Biotic Interference

Sebolt

Landis

2004

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Arthropod Predators of <I>Galerucella calmariensis</I> L. (Coleoptera: Chrysomelidae): An Assessment of Biotic Interference

Sebolt

Landis

2004

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“…The focus on those features that are widely considered to characterize generalist species has provided few reliable generalizations about predators that can be used to improve biological control outcomes. Putatively generalist predators are assumed to be effective biocontrol agents (Agusti & Gabarra, ; Bjorkman et al ., ) because they are able to feed opportunistically on alternative food sources as they become relatively abundant (Chang & Kareiva, ; Bilde, Axelsen & Toft, ; Symondson et al ., ; Wiebe & Obrycki, ; Harwood & Obrycki, ; Evans, ). Such behaviour in predators would have obvious advantages for biological control, and they do feed as expected at times, but such behaviour is surprisingly difficult to demonstrate conclusively in the field.…”

Section: Ecological Generalism and Implications For Biocontrolmentioning

confidence: 99%

The conceptual and practical implications of interpreting diet breadth mechanistically in generalist predatory insects

Finlay-Doney

Walter

2012

Biol J Linn Soc Lond

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The concept of ecological generalism (or polyphagy) is widely used in ecology to describe and predict aspects of the behaviour of predatory insects, notably with regard to the management of insect pests. The assumptions of ecological generalism have their basis in competition and optimization. We review the historical context and perspectives that led to the development of the concept of ecological generalism as it is applied to diet breadth in predatory insects. We identify how flaws in this concept limit its utility in describing and predicting the behaviour of organisms. We re‐analyse the behavioural expectations of putatively generalist organisms with a focus on the mechanistic aspects of predation; that is, we develop an interpretation based on the adaptations that mediate their responses to particular cues in their environment. This mechanistic analysis emphasizes the need to determine the primary environmental associations of putatively generalist species, and the adaptations that underpin those associations. This approach thus highlights the importance of appropriate matching of predator species to prey species in biological control, based on an understanding of these adaptations and associations. © 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, ••, ••–••.

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“…Failure of populations to build for years after initial releases is occasionally reported (Blossey et al 2001, Seboldt and Landis 2002, Wiebe and Obrycki 2002, Landis et al 2003. For some of these areas, data on interference of generalist predators already exists (Nechols et al 1996, Wiebe andObrycki 2002); for other sites this remains speculation. Generalist predation was considered a risk for G. calmariensis as early as 1991 (Nechols et al 1996).…”

Section: Discussionmentioning

confidence: 99%

“…calmariensis appears to have the reproductive capacity and behavioral mechanisms allowing the species to escape its natural enemies, these data from our mesocosm and field cage studies may not hold true across the entire current North American distribution of the leaf beetle. Failure of populations to build for years after initial releases is occasionally reported (Blossey et al 2001, Seboldt and Landis 2002, Wiebe and Obrycki 2002, Landis et al 2003). For some of these areas, data on interference of generalist predators already exists (Nechols et al 1996, Wiebe and Obrycki 2002); for other sites this remains speculation.…”

Section: Discussionmentioning

confidence: 99%

Disruption of Weed Biological Control by an Opportunistic Mirid Predator

Hunt-Joshi

Root

Blossey

2005

Ecological Applications

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Species cascades involving generalist predators, biological control herbivores, and invasive plants have great potential to disrupt weed biological control efforts and the ability of herbivores to limit plant invasions. We found that Plagiognathus politis, a mirid bug typically reported as herbivorous and as an agricultural pest, was an avid opportunistic predator of Galerucella calmariensis, an herbivore introduced to North America for biological control of Lythrum salicaria (purple loosestrife). In field cages, adult and immature mirid bugs consumed large numbers of eggs and young larvae of G. calmariensis in addition to feeding on purple loosestrife leaves. We document a species cascade that benefited purple loosestrife; in mesocosms, mirid predation on G. calmariensis allowed purple loosestrife to maintain greater leaf, stem, and reproductive biomass than without predators. In field cages, however, top-down effects were weaker, probably because G. calmariensis had a temporal refuge from predation. An early-season window of low predation pressure (where beetle eggs hatched and eclosed earlier than mirids) allowed G. calmariensis to establish and persist within our field cages. Our experiments show that, although mirids initiated a clear species cascade in potted plant mesocosms, this was less evident in field cages, probably due to increased spatial and temporal complexity. However, since mirid predators consume large numbers of eggs and larvae, effectiveness of G. calmariensis as a biological control agent could be greatly suppressed when release sites are inhabited by P. politis. Interference of weed biological control by opportunistic generalist predators is particularly important to document because it is usually subtle and may remain unrecognized even if release efforts fail. However, despite this, herbivore establishment rates in weed control programs could be greatly improved through repeated large-scale releases that satiate potential predators, thus allowing herbivores to escape their limiting influence.

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Prey Suitability of Galerucella pusilla Eggs for Two Generalist Predators, Coleomegilla maculata and Chrysoperla carnea

Cited by 14 publications

References 28 publications

Arthropod Predators of <I>Galerucella calmariensis</I> L. (Coleoptera: Chrysomelidae): An Assessment of Biotic Interference

Arthropod Predators of <I>Galerucella calmariensis</I> L. (Coleoptera: Chrysomelidae): An Assessment of Biotic Interference

The conceptual and practical implications of interpreting diet breadth mechanistically in generalist predatory insects

Disruption of Weed Biological Control by an Opportunistic Mirid Predator

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