Person:
Schlötelburg, Annika

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1986
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Schlötelburg
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Annika
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2021 - 20222
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  • Vorschaubild nicht verfügbar
    Veröffentlichung
    Effects of anticoagulant rodenticide poisoning on spatial behavior of farm dwelling Norway rats
    (2021) Walther, Bernd; Ennen, Hendrik; Geduhn, Anke; Schlötelburg, Annika
    Commensal rodent species cause damage to crops and stored products, they transmit pathogens to people, live-stock and pets and threaten nativeflora and fauna. Tominimize such adverse effects, commensal rodentsare pre-dominantly managed with anticoagulant rodenticides (AR) that can be transferred along the food chain. Wetested the effect of the uptake of the AR brodifacoum (BR) by Norway rats (Rattus norvegicus) on spatial behaviorbecause this helps to assess the availability of dead rats and residual BR to predators and scavengers. BR was de-livered by oral gavage or free-fed bait presented in bait stations. Rats were radio-collared to monitor spatial be-havior. BR residues in rat liver tissue were analyzed using liquid chromatography coupled with tandem massspectrometry. Norway rats that had consumed BR decreased distances moved and had reduced home rangesize. Treatment effects on spatial behavior seemed to set in rapidly. However, there was no effect on habitat pref-erence. Ninety-two percent of rats that succumbed to BR died in well-hidden locations, where removal by scav-enging birds and large mammalian scavengers is unlikely. Rats that ingested bait from bait stations had 65% higher residue concentrations than rats that died from dosing with two-fold LD50.Thissuggestsanoverdosingin rats that are managed with 0.0025% BR. None of the 70 BR-loaded rats was caught/removed by wild preda-tors/scavengers before collection of carcasses within 5-29 h. Therefore, and because almost all dead rats diedin well-hidden locations, they do not seem to pose a significant risk of AR exposure to large predators/scavengers at livestock farms. Exposure of large predators may originate from AR-poisoned non-target small mammals. Thefew rats that died in the open are accessible and should be removed in routine searches during and after the ap-plication of AR bait to minimize transfer of AR into the wider environment. © 2021 The Authors. Published by Elsevier B.V.
  • Vorschaubild nicht verfügbar
    Veröffentlichung
    Testing animal welfare of house mouse (Mus musculus) snap and electrocution traps
    (2022) Dymke, Deborah; Fleischer, Samantha; Geduhn, Anke; Kalle, Agnes; Schlötelburg, Annika; Schmolz, Erik
    The use of killing traps for rodent pest control is currently gaining relevance again but there is no approval or authorization process for rodent traps in most countries. Hence, a guidance for testing and evaluating animal welfare impact was recently published by the expert group on "Non-Chemical alternatives for Rodent control" (NoCheRo). Using the NoCheRo- Guidance, we investigated the animal welfare impact of 10 different house mouse (Mus musculus) killing trap products in a semi-natural setting. All 10 trap products were attractive to the target mice because >/= 90% of them visited the traps at least once within a few days; in 5 tests, >/= 90% approached traps on the 1st day. Two electrocution trap products and 3 of 8 (37.5%) snap trap products met the animal welfare criteria. Most (95%) of the test animals caught with criteria-compliant traps were irreversibly unconscious within 50 sec; 90% within 30 sec. The majority (97 %) of house mice were rapidly unconscious when hit in the head/neck region by a snap trap. Five trap products were not in compliance with the animal welfare criteria. The results show that the NoCheRo-Guidance enables a distinction between rodent traps that meet the criteria for animal welfare and those that are deficient in this respect. Certification of such tested traps based on a sound scientific basis allows for a selection of suitable traps, and thus improve animal welfare in pest rodent control. © 2022 by the authors