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Improving the breeding success of a colonial seabird: a cost-benefit comparison of the eradication and control of its rat predator
BRB
Available Online

Bretagnolle, Vincent.

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Culioli, Jean-Michel.

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Lorvelec, Olivier.

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Pascal, Michel Pascal.

2008
Breeding success of 5 Cory’s shearwater Calonectris diomedea sub-colonies of Lavezzu Island (Lavezzi Archipelago, Corsica) was checked annually for 25 consecutive years from 1979 to 2004. Between 1989 and 1994, 4 ship rat Rattus rattus controls were performed in several subcolonies. In November 2000, rats were eradicated from Lavezzu Island and its 16 peripheral islets (85 ha) using traps then toxic baits. We compare cost (number of person-hours required in the field) and benefit (Cory’s shearwater breeding success) of control and eradication. The average breeding success doubled when rats were controlled or eradicated (0.82) compared to the situation without rat management (0.45). Moreover, the average breeding success after eradication (0.86) was significantly (11%) higher than after rat controls (0.75). Furthermore, the great variation in breeding success recorded among sub-colonies both with and without rat control declined dramatically after eradication, suggesting that rats had a major impact on breeding success. The estimated effort needed to perform eradication and checking of the permanent bait-station system during the year following eradication was 1360 person-hours. In contrast, rat control was estimated to require 240 or 1440 person-hours per year when implemented by trained and untrained staff, respectively. Within 6 yr, eradication cost is lower than control cost performed by untrained staff and confers several ecological advantages on more ecosystem components than Cory’s shearwater alone. Improved eradication tools such as hand or aerial broadcasting of toxic baits instead of the fairly labour-intensive eradication strategy we used would dramatically increase the economic advantage of eradication vs. control. Therefore, when feasible, we recommend eradication rather than control of non-native rat populations. Nevertheless, control remains a useful management tool when eradication is not practicable.
JICA's Approach to the Millennium Development Goals for inclusive and dynamic development
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JICA

2010
Shinichi Kitaoka JICA president, April 7, attended the public event to discuss are affected by the conflict, which the Brookings Institution (Washington DC) was organized, about the role of development in highly vulnerable areas, keynote with perform, it took part in the panel discussion. (In an unstable region, how to realize the development), "Securing Development in Insecure Places" in the this event, titled, US State Department of Sharon Morris Deputy Assistant Secretary (Near East, the Western Hemisphere and Europe in charge), Georgetown University Edmund • a • Walsh diplomacy School of Joel Hermann science director, Brookings Institution Bruce Jones Vice-President and foreign policy program director (or more panelists), Homi crow Senior Fellow and global economy and development program of the Institute deputy director (moderator, moderator) will participate, for the role of development aid in conflict-vulnerable region, lively discussion from a professional point of view have been made. It should be noted that, in the event, the US government, development agencies, universities and research institutes, diplomatic corps, and the private sector, NGO, mass media, etc. about 120 people took part. Kitaoka Chairman, in the keynote speech, reviewing the history of parallel Japan of international cooperation, which began from Asia and the post-war compensation, but was also failures and inadequacies, generally the experience that helped the Asian countries of the development-oriented Although it was a success, it said to have contributed significantly to job creation and poverty reduction through the stabilization of the country, the economic development.