Persistence of sodium monofluoroacetate (1080) in baits under simulated rainfall

Bowen, Lynn H.; Morgan, David R.; Eason, Charles

doi:10.1080/00288233.1995.9513155

Cited by 22 publications

(24 citation statements)

References 2 publications

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“…5). Apparently undecayed carrot was still common at least 5 weeks afterward (fieldworker observations), and 1080 does not rapidly leach out of carrot bait (Bowen et al 1995). The undecayed bait would still have been toxic, so the pests should have had time to encounter a lethal amount of edible bait.…”

Section: Discussionmentioning

confidence: 99%

Effect of prefeeding, sowing rate and sowing pattern on efficacy of aerial 1080 poisoning of small-mammal pests in New Zealand

et al. 2011

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Context. Aerial poisoning using sodium fluoroacetate (1080) is an important but controversial technique used for large-scale control of brushtail possums (Trichosurus vulpecula) and other pests in New Zealand. The technique reliably produces near total kills of possums and rats, provided that many tens of baits (and therefore many tens of individually lethal doses) are sown for each target animal present.Aim. The aim of this study was to further refine aerial 1080 poisoning by determining the effect of prefeeding, sowing rate, and sowing pattern on effectiveness.Methods. Eighteen experimental treatments comprising all possible combinations of three sowing rates (1, 2, and 5 kg/ha of bait), three frequencies of non-toxic prefeed (0, 1, and 2) and two sowing patterns (parallel and cross-hatched) were applied to each of two forested areas. Treatment effectiveness was assessed from changes in the rate of interference recorded on baited cards for three species: possum, ship rat (Rattus rattus) and mouse (Mus musculus).Key results. Outcomes were highly variable, ranging from increases in pest activity to near total reductions. Possum reductions were highest where one or two prefeeds were used, and at the higher sowing rates (2 or 5 kg/ha), but with some interactions between these factors. For rats, two prefeeds resulted in the highest reductions but sowing rate had no effect. For mice, post-poisoning indices were often high, indicating low effectiveness.Conclusions. Some treatments were highly effective so poor kills were unlikely to have resulted from pests not encountering bait, or the bait being unpalatable. Rather they appeared to reflect sub-lethal poisoning either as a result of low acceptance (as a result of a lack of familiarity and/or satiation) or bait fragmentation. We infer that for possum and rats prefeeding helps reduce this risk of sub-lethal poisoning not only by increasing familiarity, but also (in conjunction with high sowing rates) by increasing the bait encounter rate, particularly for possums.Implications. There is scope to further reduce the amount of toxic bait sown and the cost of poisoning, without compromising efficacy, by fine-tuning the balance between prefeeding and sowing rate based on which species are being targeted and, for possums, reducing bait fragmentation.

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Section: Discussionmentioning

confidence: 99%

Effect of prefeeding, sowing rate and sowing pattern on efficacy of aerial 1080 poisoning of small-mammal pests in New Zealand

et al. 2011

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“…7 (0.15% w/ w 1080) baits. Bowen et al (1995) indicated a sharp decline in 1080 release rates after 1 h of rainfall for Wanganui baits. Thus, two different best-fit equations were developed based on the data published by Bowen et al (1995) to represent the varying 1080 release rates with rainfall duration (Equation 1).…”

Section: Methodsmentioning

confidence: 99%

“…Bowen et al (1995) studied 1080 release from Wanganui No. 7 and RS5 cereal baits with two different 1080 concentrations, 0.08 and 0.15% w/w 1080, under simulated rainfall conditions.…”

Section: Methodsmentioning

confidence: 99%

“…The source sub-model was based on 1080 release from bait data from Bowen et al (1995). Bowen et al (1995) studied 1080 release from Wanganui No.…”

Section: Methodsmentioning

confidence: 99%

“…Bong et al (1979), based on laboratory studies, reported that 75% of 1080 is defluorinated at 25 8C in 14 days. Bowen et al (1995) quantified 1080 release from cereal baits (Wanganui No. 7 and RS5) under simulated rainfall conditions (20 mm/h applied continuously for 10 h).…”

Section: Introductionmentioning

confidence: 99%

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Investigating the fate of sodium monofluoroacetate during rain events using modelling and field studies

Srinivasan

Suren

Schmidt

2012

New Zealand Journal of Marine and Freshwater Research

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We examined catchment-scale transport of sodium monofluoroacetate ('1080') in rainfall runoff. We developed a hydrological model describing the overland transport of 1080 and validated model results using field data from a headwater catchment, where we intensively sampled a stream during a rainfall event (28 mm in 8 h) that followed 1080 aerial application. Only one stream sample contained a measurable concentration of 1080 (0.1 mg/l; collected 105 min from the start of rainfall), while 1080 was below detection limits (0.1 mg/l) in all other samples. Absence of visually observable overland flow conditions (puddles and saturated areas connected to the stream) early during the rainfall event suggested that overland transport might not have been the dominant mechanism in this catchment. Moreover, analyses of soilwater samples collected from lysimeters installed in the catchment indicated the propensity of 1080 to leach into soil, suggesting the need to investigate subsurface transport pathways.

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Memory retention of conditioned aversion training in New Zealand's alpine parrot, the kea

McLean

Nichols²,

Taylor

et al. 2022

J Wildl Manag

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New Zealand pest control operations commonly deploy toxic sodium fluoroacetate (1080) baits to control introduced mammalian predators and protect vulnerable native fauna, yet the highly intelligent kea (Nestor notabilis) is at risk of mortality following ingestion of toxic baits intended for their protection. We tested the retention of conditioned aversion in 11 captive kea that had learned to avoid baits containing the bird repellent anthraquinone alongside color, olfactory, and taste cues. We revisited kea over increasing time intervals (3 days, 5 weeks, 3 months, 6 months, and 1 yr) offering them otherwise identical non‐repellent baits. Kea retained their aversion until the final session, 1 year after previous exposure to reinforcement, and almost 2 years since previous exposure to repellent. Whether the kea forgot their aversion or the repeated exposures to non‐repellent baits resulted in extinction of the aversion, our results indicate that kea are capable of remembering an aversion for long enough to be of practical use to conservation managers in reducing kea mortality through 1080 operations.

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Persistence of sodium monofluoroacetate (1080) in baits under simulated rainfall

Cited by 22 publications

References 2 publications

Effect of prefeeding, sowing rate and sowing pattern on efficacy of aerial 1080 poisoning of small-mammal pests in New Zealand

Effect of prefeeding, sowing rate and sowing pattern on efficacy of aerial 1080 poisoning of small-mammal pests in New Zealand

Investigating the fate of sodium monofluoroacetate during rain events using modelling and field studies

Memory retention of conditioned aversion training in New Zealand's alpine parrot, the kea

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