Ground-based rodent control in a remote Hawaiian rainforest on Maui.

Malcolm, T.R. and Swinnerton, K.J. and Groombridge, J.J. and Sparklin, B.D. and Brosius, C.N. and Vetter, J.P. and Foster, J.T. (2008) Ground-based rodent control in a remote Hawaiian rainforest on Maui. Pacific Conservation Biology, 14 (3). pp. 206-214. (Full text available)

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Abstract

Effective control of introduced mammalian predators is essential to the recovery of native bird species in Hawai‘i. Between August 1996 and December 2004, introduced rodents were controlled within three home ranges of the Po‘ouli Melamprosops phaeosoma, a critically endangered Hawaiian honeycreeper. Rats were controlled using a combination of ground-based rodenticide (0.005% diphacinone) application and snap traps. Beginning in August 2001, we monitored the effectiveness of these rodent control efforts. Relative abundances of Black Rats Rattus rattus and Polynesian Rats R. exulans were measured in each of five snap-trapping grids seven times over a 35-month period. Rat populations decreased inside of the rodent control areas, but control effectiveness differed between rat species. During the first year of monitoring, target control levels for R. rattus were consistently achieved in only one of the rodent control areas. Control techniques were refined in areas failing to meet targets. Subsequently, we achieved target control levels for R. rattus more consistently in all three rodent control areas. However, relative abundances of R. exulans did not differ between rodent control and reference areas, indicating that our rodent control techniques were insufficient to reduce population levels of this species. These findings signify a need for further improvement of rodent control methods in Hawai‘i, especially for Polynesian Rats, and demonstrate the critical importance of periodic monitoring of the response of rodent populations to management. In the future, managers may need to design rodent control operations targeting R. rattus and R. exulans independently to achieve best results.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation > DICE (Durrell Institute of Conservation and Ecology)
Depositing User: Jim Groombridge
Date Deposited: 29 Jun 2011 16:36
Last Modified: 30 May 2012 08:32
Resource URI: http://kar.kent.ac.uk/id/eprint/27507 (The current URI for this page, for reference purposes)
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