Population Regulation of Argentine Stem WeevilListronotus bonariensis(Kuschel) (Coleoptera: Curculionidae) in Dryland New Zealand Pastures: a Multitrophic Interaction

McNeill, M.R.; Proffitt, J. R.; Barlow, N. D.; Goldson, S. L.

doi:10.1603/0046-225x-32.4.771

Cited by 8 publications

(6 citation statements)

References 28 publications

(31 reference statements)

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“…In their Canterbury survey, McNeill et al . (2003) observed that even in Lolium perenne pasture with far lower numbers of endophyte-free tillers m −2 than in this study, they did not always exert population regulation. McNeill et al .…”

Section: Discussioncontrasting

confidence: 68%

“…In their Canterbury survey, McNeill et al (2003) observed that even in Lolium perenne pasture with far lower numbers of endophyte-free tillers m À 2 than in this study, they did not always exert population regulation. McNeill et al (2003) concluded that the effects of tiller resource limitation only became apparent when there were high weevil populations, reflecting some kind of non-linear density-dependent response. The Canterbury results, therefore, contrast with the Waikato finding of Barker et al (1989) who found clear population regulation in varyingly endophytic dairy pasture with tiller densities of around ca.…”

Section: Egg To Fourth Instar Mortalitymentioning

confidence: 99%

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Argentine stem weevil (Listronotus bonariensis, Coleoptera: Curculionidae) population dynamics in Canterbury, New Zealand dryland pasture

Goldson

Barron

Kean

et al. 2010

Bull. Entomol. Res.

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The Argentine stem weevil (Listronotus bonariensis) was an economically important pest in New Zealand pastures until the release of the parasitoid Microctonus hyperodae. This contribution uses historical data to investigate the regulation of the pest populations prior to, and somewhat during, the establishment of this parasitoid in dryland Canterbury, New Zealand. Thus, a significant goal of this study is to provide an L. bonariensis population dynamics baseline for any future work that aims to analyse the full effects of M. hyperodae on the weevil, now that equilibrium with the weevil host has been reached.The population dynamics of L. bonariensis, based on a life-table approach, were investigated using data collected regularly for eight years from populations in Canterbury, New Zealand. The key factor affecting end-of-season L. bonariensis density was found to be variation in second generation fourth instar prepupal and pupal mortality. This may have been caused by arrested development and ongoing mortality resulting from the onset of cooler autumnal conditions.A compensatory response was found in recruitment to the second summer weevil generation, whereby the realised fecundity of the emergent first summer generation of weevils was found to be negatively related to the density of adult weevils per ryegrass tiller. This is the first time that this has been found via long-term population analysis of L. bonariensis, although indications of this have been found elsewhere in caging, pot and small plot experiments.In this study, the effect of the parasitoid biocontrol agent Microctonus hyperodae on L. bonariensis population dynamics was unclear, as the analysis covered a period when the parasitoid Microctonus hyperodae was introduced and still establishing. It does, however, raise important questions for future analysis in terms of the interaction between parasitism and unrealised fecundity.The results in this contribution also highlighted regional differences. Overwintering mortality of adult weevils in Canterbury was constant between years, whilst earlier studies in the North Island Waikato region indicated this mortality was density dependent. In addition, the availability of tillers in endophyte-free ryegrass pastures in Canterbury had no influence on egg and early-instar larval survival, which contrasts with the finding from endophytic Waikato pastures.

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Section: Discussioncontrasting

confidence: 68%

Section: Egg To Fourth Instar Mortalitymentioning

confidence: 99%

Argentine stem weevil (Listronotus bonariensis, Coleoptera: Curculionidae) population dynamics in Canterbury, New Zealand dryland pasture

Goldson

Barron

Kean

et al. 2010

Bull. Entomol. Res.

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“…SPEIGHT et al 1999), que nos adultos está intimamente relacionada com a longevidade e sobreposição de gerações (DELOACH & CORDO 1976a), enquanto que nos imaturos pode estar associada à competição intraespecífica, que ocorre na fase larval, influenciando diretamente as taxas de natalidade e mortalidade dentro das populações (CENTER 1987;MCNEILL et al 2003;WILSON et al 2006).…”

Section: Resultsunclassified

<htm>Dinâmica populacional de duas espécies de Neochetina (Coleoptera: Curculionidae) associadas à Eichhornia crassipes (Pontederiaceae), em lagoas marginais ao rio Cuiabá, Pantanal de Mato Grosso, Brasil</htm>

Sousa

Marques

Rosado-Neto

et al. 2011

ABPar

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“…In effect, and consistent with the findings of Goldson (1981b), caging was found to cause serious disruption to ASW reproductive activity. Moreover, although some density-dependent effects in the field are known (Barker et al 1989b;McNeill et al 1998McNeill et al , 2003Goldson et al 2011), these were never apparent among caged weevils. Kalvelage (1999), who conducted experiments in laboratory-reared weevils, also found few significant treatment effects and concluded that only weak density-dependent effects were to be found.…”

Section: Discussionmentioning

confidence: 99%

“…In the field in Canterbury (South Island), McNeill et al (2003) found that such density-dependent suppression of oviposition was only sporadic and not apparent unless there was exceptionally high weevil population densities combined with high spring temperatures. This was later supported by Goldson et al (2011) in their population dynamics analysis, which showed that realised fecundity of emergent first-generation summer weevils in Canterbury is negatively related to the density of adult weevils per ryegrass tiller.…”

Section: Introductionmentioning

confidence: 97%

Caging overrides effects of density in laboratory‐based physiological estimates of reproductivity in Listronotus bonariensis (Coleoptera: Curculionidae)

Vereijssen

Goldson

2015

Austral Entomology

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This contribution examines the potential for error when the results from laboratory-based experiments are extrapolated to inform field ecological analyses. The effects on the reproductivity of different population densities of Argentine stem weevil Listronotus bonariensis (Kuschel) were studied using caged populations of immature (pre-reproductive) and mature (reproductive) adults. Three densities of weevils equivalent to 125/m 2 (low), 375/m 2 (medium) and 1125/m 2 (high) from field-collected pre-and reproductive populations were confined in plastic containers for either 11 or 21 days with ad libitum food and oviposition-site resources. The impact of the medium and high densities on weevil reproductive physiology was assessed by dissection at 11 and 21 days. Data were collected on sexual maturity, wing muscle development, and the presence of eggs and β-carotene crystals. Only very weak treatment effect responses were observed. A significantly higher percentage of immature females showed oöcyte resorption at high densities at 11 days, but by 21 days this had disappeared. Males had significantly less developed testes at high densities at 11 days, but again by 21 days this effect was not significant. Mature females had significantly larger wing muscles at high density after 11 days of caging; however, by 21 days this effect had gone. For both immature and mature females, there was no effect of density on the relationship between eggs per female and wing muscle index. The low density treatment was not included in this analysis due to low weevil numbers surviving at the end of the experiment. It is concluded that caging itself had a far greater effect on the physiology of the weevils than any imposed population density treatments, which is contrary to the findings of field population-dynamics analyses. Care should be taken in extrapolating laboratory trials involving this genus, and indeed it may occur more widely, to explain field situations.

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Population Regulation of Argentine Stem WeevilListronotus bonariensis(Kuschel) (Coleoptera: Curculionidae) in Dryland New Zealand Pastures: a Multitrophic Interaction

Cited by 8 publications

References 28 publications

Argentine stem weevil (Listronotus bonariensis, Coleoptera: Curculionidae) population dynamics in Canterbury, New Zealand dryland pasture

Argentine stem weevil (Listronotus bonariensis, Coleoptera: Curculionidae) population dynamics in Canterbury, New Zealand dryland pasture

<htm>Dinâmica populacional de duas espécies de <i>Neochetina </i>(Coleoptera: Curculionidae) associadas à <i>Eichhornia crassipes </i>(Pontederiaceae), em lagoas marginais ao rio Cuiabá, Pantanal de Mato Grosso, Brasil</htm>

Caging overrides effects of density in laboratory‐based physiological estimates of reproductivity in Listronotus bonariensis (Coleoptera: Curculionidae)

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