Assessment of the Performance and Efficacy of the AT220 Trap at Haleakalā National Park
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2024-09
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Abstract
Predator control is an ongoing and necessary management tool used to protect native Hawaiian birds at Haleakalā National Park. Since 2017, adaptive management principles have been used to test and integrate new lethal trapping tools as they become available. This project assessed the trapping performance and efficacy of the New Zealand Autotraps AT220 self-resetting, self-rebaiting trap.
The AT220 traps were mounted at either a 45° or 90° angle for testing. The traps were baited with the AT220 factory formula or modified custom baits that were created in-house. Wildlife cameras were paired with armed and unarmed AT220 traps to assess species interactions throughout the study. Captures of each predator species was recorded to determine trap efficacy which was calculated using catch per unit effort (CPUE). The significant difference for capture efficacy between trap type by predator species was calculated using a two-sample proportion test on R (version 4.4.1). This study was conducted in two phases.
Capture rates for Phase One compared AT220 and DOC 250 traps that were in similar areas. During Phase One, CPUE for AT220 traps was 28.01 for rats, 2.44 for mongoose, and 1.21 for mice compared to DOC 250 traps that showed a CPUE of 54.3 for rats, 4.59 for mongoose, and 6.09 for mice. When determining if capture efficacy was significantly different between DOC 250 and AT220s, capture rates for rats showed a significant difference (p < 0.05) while mongoose and mice capture rates showed no significant difference (p > 0.05). AT220 traps were modified after Phase One to address trap malfunctions.
Capture rates for Phase Two compared the modified AT220s to Timms traps located in similar areas. During Phase Two, CPUE for AT220s was 166.67 for mongooses compared to Timms traps that showed a CPUE of 1047.62 for mongoose and 95.24 for feral cats. When determining if capture efficacy was significantly different between Timms and AT220s, mongoose capture rates showed a significant difference (p < 0.05). No proportion test was calculated to compare significant difference for cats since the AT220 capture rate was zero. Both the DOC 250 and Timms traps outperformed the AT220 during this study, though one significant disadvantage to these traps is that they need to be manually reset after each capture.
Although the AT220 showed potential for capturing rats, mice and mongoose, several mechanical flaws and difficulties may hamper productivity. This study suggests that until improvements are made to the AT220, incorporating them into the Haleakalā National Park predator control program on a large scale would not be beneficial at this time.
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A Technical report in PDF format.
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Purdy, K., Chen, H., Kaholoaa, R. and Passaro, K. 2024. Assessment of the Performance and Efficacy of the AT220 Trap at Haleakalā National Park. Technical Report #205. Pacific Cooperative Studies Unit, University of Hawaiʻi, Honolulu, Hawaiʻi. 19 pp.
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19 Pages
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Haleakalā National Park, Hawaiʻi, Maui
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http://rightsstatements.org/vocab/NoC-NC/1.0/
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