Negative Ecological Effects of the Musk Thistle Biological Control Agent, Rhinocyllus Conicus

Louda, Svaťa M.

doi:10.1007/978-1-4615-4577-4_13

Cited by 70 publications

(118 citation statements)

References 42 publications

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“…Development takes 53-76 days, allowing one generation per year (Zwölfer and Harris 1984). After 1993-1994, when R. conicus invaded our long-term Sand Hills study sites, its numbers increased significantly on both of the native thistles (Louda et al , 1998Louda 1998Louda , 2000. No exotic thistles occurred in our Sand Hills sites.…”

Section: Natural History and Backgroundmentioning

confidence: 89%

“…Sampling procedures for wavyleaf thistle paralleled those used previously in studies of Platte thistle (Louda 2000;Russell and Louda 2004;Rose et al 2005). To quantify flowering and floral herbivory, we sampled adult plants at two sites at each preserve [1991][1992][1993][1994][1995][1996][1997][1998][1999][2000][2001].…”

Section: Field Datamentioning

confidence: 99%

“…These measurements are sufficient to derive the shape of the plant flowering phenology distribution and to quantify R. conicus oviposition levels (Louda 1998(Louda , 2000Rose et al 2005). On each date, we recorded diameter and developmental stage of all of the flower heads on each marked plant.…”

Section: Field Datamentioning

confidence: 99%

“…In these prairies, R. conicus oviposits not only on wavyleaf thistle, but it also has heavily impacted a second, native thistle, Platte thistle (C. canescens Nutt.) Louda and Arnett 2000;Louda et al 2003;Rose et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Indirect interaction between two native thistles mediated by an invasive exotic floral herbivore

Russell

Louda

2005

Oecologia

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., "Indirect interaction between two native thistles mediated by an invasive exotic floral herbivore" (2005). Faculty Publications in the Biological Sciences. 58. http://digitalcommons.unl.edu/bioscifacpub/58 AbstractSpatial and temporal variation in insect floral herbivory is common and often important. Yet, the determinants of such variation remain incompletely understood. Using 12 years of flowering data and 4 years of biweekly insect counts, we evaluated four hypotheses to explain variation in damage by the Eurasian flower head weevil, Rhinocyllus conicus, to the native North American wavyleaf thistle, Cirsium undulatum. The four factors hypothesized to influence weevil impact were variations in climate, weevil abundance, phenological synchrony, and number of flower heads available, either on wavyleaf thistle or on the other co-occurring, acquired native host plant (Platte thistle, Cirsium canescens), or on both. Climate did not contribute significantly to an explanation of variation in R. conicus damage to wavyleaf thistle. However, climate did influence weevil synchrony with wavyleaf flower head initiation, and phenological synchrony was important in determining R. conicus oviposition levels on wavyleaf thistle. The earlier R. conicus was active, the less it oviposited on wavyleaf thistle, even when weevils were abundant. Neither weevil abundance nor availability of wavyleaf flower heads predicted R. conicus egg load. Instead, the strongest predictor of R. conicus egg load on wavyleaf thistle was the availability of flower heads on Platte thistle, the more common, earlier flowering native thistle in the sand prairie. Egg load on wavyleaf thistle decreased as the number of Platte thistle flower heads at a site increased. Thus, wavyleaf thistle experienced associational defense in the presence of flowering by its now declining native congener, Platte thistle. These results demonstrate that prediction of damage to a native plant by an exotic insect may require knowledge of both likely phenological synchrony and total resource availability to the herbivore, including resources provided by other nontarget native species.

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Section: Natural History and Backgroundmentioning

confidence: 89%

Section: Field Datamentioning

confidence: 99%

Section: Field Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Indirect interaction between two native thistles mediated by an invasive exotic floral herbivore

Russell

Louda

2005

Oecologia

Self Cite

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“…For instance, a herbivore (Rhinocyllus conicus) was introduced to biologically control Platte thistle (Cirsium canescens) in the United States. After dispersal it attacked a protected and rare relative, the Pitcher's thistle (Cirsium pitcheri) (Louda et al 1997;Louda 1999;Louda et al 2003;Louda et al 2005).…”

Section: Introductionmentioning

confidence: 99%

On the risk of extinction of a wild plant species through spillover of a biological control agent: Analysis of an ecosystem compartment model

Chalak

Hemerik

Werf

et al. 2010

Ecological Modelling

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Individual Species Management: Threatened Taxa and Invasive Species

Simberloff¹

2007

Managing and Designing Landscapes for Conservation

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Negative Ecological Effects of the Musk Thistle Biological Control Agent, Rhinocyllus Conicus

Cited by 70 publications

References 42 publications

Indirect interaction between two native thistles mediated by an invasive exotic floral herbivore

Indirect interaction between two native thistles mediated by an invasive exotic floral herbivore

On the risk of extinction of a wild plant species through spillover of a biological control agent: Analysis of an ecosystem compartment model

Individual Species Management: Threatened Taxa and Invasive Species

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