Quantitative assessment of predation of eggs and larvae of Galerucella pusilla in Iowa

Wiebe, Amy P.; Obrycki, John J.

doi:10.1016/j.biocontrol.2004.04.007

Cited by 22 publications

(23 citation statements)

References 24 publications

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“…There were only 5 studies in the tropics (Jones et al ., ; Pearce & Zalucki, ; Kaufman & Wright, ; de Medeiros et al ., ; Vieira et al ., ). There was also a bias for cultivated habitats and farms ( n = 51), with fewer studies in forested (Duan et al ., ; Jennings et al ., ), urban (Dobbs & Potter, ), grassland (Lövei & Brown, ), or wetland (Wiebe & Obrycki, ) habitats. In one case (Kaufman & Wright, ), the habitat chosen for the experiment was not clearly stated.…”

Section: Resultsmentioning

confidence: 99%

A review of the sentinel prey method as a way of quantifying invertebrate predation under field conditions

2017

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Sentinel prey can provide a direct, quantitative measure of predation under field conditions. Live sentinel prey provides more realistic data but rarely allows the partitioning of the total predation pressure; artificial prey is less natural but traces left by different predators are identifiable, making it suitable for comparative studies. We reviewed the available evidence of the use of both types of invertebrate sentinel prey. Fifty-seven papers used real prey, usually measuring predation on a focal (often pest) species, with studies overwhelmingly from North America. The median predation was 25.8% d . Artificial sentinel prey (45 papers) were used in both temperate and tropical areas, placed more above ground than at ground level. The most commonly used artificial prey imitated a caterpillar. Up to 14 predator groups were identified, registering a median of 8.8% d predation; half the studies reported only bird predation. Predation on real prey was higher than on artificial ones, but invertebrate predation was not higher than vertebrate predation. Invertertebrate but not vertebrate predation was negatively related to prey size. Predation near the Equator was not higher than at higher latitudes, nor in cultivated than noncultivated habitats. The use of sentinel prey is not yet standardised in terms of prey size, arrangement, exposure period or data reporting. Due to the simplicity and ease of use of the method, such standardisation may increase the usefulness of comparative studies, contributing to the understanding of the importance and level of predation in various habitats worldwide.

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Section: Resultsmentioning

confidence: 99%

A review of the sentinel prey method as a way of quantifying invertebrate predation under field conditions

2017

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“…(Hazzard & Ferro 1991, Hilbeck et al 1997, Nault & Kennedy 2000, Mallampalli et al 2005 ). Wiebe and Obrycki (2004) reported Col. maculata feeding on eggs of another chrysomelid, Galerucella pusilla , but the larvae did not thrive well on this prey. The functional response of Col. maculata to eggs of L. decemlineata was modifi ed by the presence of aphids, but not maize pollen.…”

Section: Euryphagous and Stenophagous Species / Generalist And Speciamentioning

confidence: 99%

Food Relationships

Hodek

Evans

2012

Ecology and Behaviour of the Ladybird Beetles (Coccinellidae)

154

129

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“…Our results confirm that flooding benefits Galerucella leaf‐beetles, but refuge from predation did not explain these findings. Predation was recognized as a possible limiting factor for Galerucella population build‐up (Malecki et al., 1993) and a suite of generalist predators preying on Galerucella after field release have been reported (Sebolt & Landis, 2004; Wiebe & Obrycki, 2004; Hunt‐Joshi et al., 2005). We expected flooding to decrease predator control as it might limit dispersal of ground‐dwelling predators.…”

Section: Discussionmentioning

confidence: 99%

The effects of flooding, plant traits, and predation on purple loosestrife leaf‐beetles

Dávalos¹,

Blossey²

2010

Entomologia Exp Applicata

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Classical biological weed control is based on the premise that introducing specialized natural enemies from the native range re‐establishes herbivore control of plant invaders, ultimately leading to negative population growth rates. Evidence from past biocontrol programs suggests that herbivores are not solely responsible for shaping plant demography. Diverse environmental conditions in the introduced range may not only affect demography, but also influence top‐down control of target plants. We investigated how flooding affects impacts of predators (top‐down) and plant quality (bottom‐up) on performance of two leaf‐beetles, Galerucella calmariensis L. and Galerucella pusilla Duftschmid (Coleoptera: Chrysomelidae: Galerucini), released in North America as biocontrol agents of purple loosestrife, Lythrum salicaria L. (Lythraceae). Predation and flooding regime have been linked to low leaf‐beetle recruitment at sites where insects failed to attain outbreak populations. Predator exclusion experiments at adjacent flooded and non‐flooded sites indicated a positive effect of flooding on leaf‐beetle survival for all developmental stages, whereas predator exposure had little effect. There was no difference in predation rates at sites with successful or failed purple loosestrife control, questioning the importance of predation in limiting growth and impact of these biocontrol agents’ populations. Effect of flooding on purple loosestrife quality was evaluated in a common garden study where plants were grown under different flooding treatments. Plants grown in flooded soil had higher water content and lower tannic acid concentration than plants grown in well‐drained soil. Consistent with field observations, leaf‐beetle oviposition rate and survival were higher on flooded plants. Results indicate that both bottom‐up and top‐down forces operate on Galerucella populations, yet their relative strength is mediated by flooding regime. Ignoring intricacies of plant‐herbivore and trophic interactions in the introduced range appears to be a major handicap for the improvement of weed biocontrol programs.

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Quantitative assessment of predation of eggs and larvae of Galerucella pusilla in Iowa

Cited by 22 publications

References 24 publications

A review of the sentinel prey method as a way of quantifying invertebrate predation under field conditions

A review of the sentinel prey method as a way of quantifying invertebrate predation under field conditions

Food Relationships

The effects of flooding, plant traits, and predation on purple loosestrife leaf‐beetles

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