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Invasive rat eradication strongly impacts plant recruitment on a tropical atoll
BRB
Available Online

Croll, Donald A.

,

Dirzo, Rodolfo.

,

Holmes, Nick D.

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Kropidlowski, Stefan.

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McKown, Matthew.

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Tershy, Bernie R.

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Wegmann, Alexander S.

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Wolf, Coral A.

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Young, Hillary S.

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Zilliacus, Kelly M.

2018
Rat eradication has become a common conservation intervention in island ecosystems and its effectiveness in protecting native vertebrates is increasingly well documented. Yet, the impacts of rat eradication on plant communities remain poorly understood. Here we compare native and non-native tree and palm seedling abundance before and after eradication of invasive rats (Rattus Rattus) from Palmyra Atoll, Line Islands, Central Pacific Ocean. Overall, seedling recruitment increased for five of the six native trees species examined. While pre-eradication monitoring found no seedlings of Pisonia grandis, a dominant tree species that is important throughout the Pacific region, post-eradication monitoring documented a notable recruitment event immediately following eradication, with up to 688 individual P. grandis seedlings per 100m2 recorded one month post-eradication. Two other locally rare native trees with no observed recruitment in pre-eradication surveys had recruitment post-rat eradication. However, we also found, by five years post-eradication, a 13-fold increase in recruitment of the naturalized and range-expanding coconut palm Cocos nucifera. Our results emphasize the strong effects that a rat eradication can have on tree recruitment with expected long-term effects on canopy composition. Rat eradication released nonnative C. nucifera, likely with long-term implications for community composition, potentially necessitating future management interventions. Eradication, nevertheless, greatly benefited recruitment of native tree species. If this pattern persists over time, we expect long-term benefits for flora and fauna dependent on these native species.
Samoan Environment Forum: proceedings of the 2005 National Environment Forum|The fact-or-myth of Samoan cultural heritage: personal reflections on family oral history / Tu'u'u Ieti Taule'alo|Samoan and Japan: concerns over mangroves development / Juliet Boon-Nanai|Status of hawksbill turtle nesting in Samoa, 2003/2004 / Mauigoa Lui Bell, Malama S. Momoemausu, Juney Ward & Malaki Iakopo|Participatory approaches for environmental initiatives - community consultation in Samoa / Natalie Mitchell|Emotional intelligence, management concept: a contributing factor for effective service delivery / Mulipola Ausetalia Titimaea|Tropical cyclone forecasting: theory and practical application - case study of tropical cyclone Olaf 2005 / Sala Sagato Tuiafiso|Samoa and the World Heritage Convention - is Samoa ready for world heritage listing / Tuiolo Schuster|Exploring the status of tsunami early warning systems in Samoa / Shaun P. Williams & Aliimalemanu F.M. Leavasa|Determination of a mean daily discharge values for Faleaseela River: implications for population water demand / Masina Nagau Chun, Iosefatu Eti & Mulipola A. Titimaea
Available Online

MNRE

2006
The community based conservation (CBC)paradigm predicts that sustainable biodiversity can only be achieved if local people perceive benefits from conservation. Through interviews, the situation in Samoa portrays that the CBC of mangroves was received with apprehension because the mangrove biodiversity was more significant than sustaining the livelihood of the local communities. In contrast, Iriomote Island residents were able to achieve maximum socio-economic benefits but to the extent that they were over commercializing the mangrove ecosystem. More research is imperative to find out how biodiversity conservation can be married with sustainable development objectives to sustain the local communities' livelihood.