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  • Publication Year 2006
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  • Subject Environment - Cook Islands
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  • Subject Climate change
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Our precious coasts - Marine pollution, climate change and the resilience of coastal ecosystems
Climate Change Resilience, Waste Management and Pollution Control
Available Online

Corcoran, E.

,

Nellemann, C.

2006
Massive coral bleaching episodes have impacted the function of the reefs and increased rates of mortality. Coral reefs support over one million plant and animal species and their economic value is pro¬jected to more than US $ 30 billion annually. Extreme climatic con¬ditions, however, are most likely to increase in the future with cur¬rent climate scenarios. Projected increases in carbon dioxide and temperature exceed the conditions under which coral reefs have flourished over the past 500 000 years. Coral reefs are crucial bio¬diversity hotspots and support both coastal fisheries and tourism in many regions. Coral reefs, however, are in decline in many regions as a result of numerous pressures, including, but not limited to, extreme climate events, unsustainable fishing practices, diseases, sedimentation, and discharge of untreated sewage. Increasing re¬silience and securing rapid recovery of coral reefs will be essen¬tial for the ability of these ecosystems to support coastal fisheries and coastal livelihoods and cultures in the future. However, this resilience and recovery may be seriously impounded by unsustain¬able coastal infrastructure development and marine pollution from land-based sources. At the current rate of growth, coastal develop¬ment may impact up to 90% of the tropical and temperate coast¬lines by 2032 if development continues unchecked. While progress has been made to reduce the discharge and impacts of oil spills and persistent organic pollutants (POP’s), there now needs to be a focus on the largest current threats to the coastal marine environment : untreated sewage and piecemeal coastal development.
Conservation of kakerori (Pomarea dimidiata) in the Cook Islands in 2004/05
BRB
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Robertson Hugh A

,

Saul Edward K

2006
In 1989, the kakerori (Pomarea dimidiata) was one of the ten rarest bird species in the world, with a declining population of just 29 birds living in south-eastern Rarotonga. As a result of conservation management, the kakerori population has rebounded, with a minimum of 281 birds on Rarotonga and 19 birds on Atiu in summer 2004/05. Since 2001, the emphasis of management in the Takitumu Conservation Area (TCA) on Rarotonga has shifted from the ‘recovery’ of kakerori to ‘sustaining’ the population at 250–300 individuals. In 2004/05, all rat bait stations were filled fortnightly, and so the labour costs were reduced by 30% to 34 person days, and toxin use (57 kg of Talon®—active ingredient brodifacoum) was reduced 81% from the peak year during the ‘recovery phase’. Kakerori breeding productivity was unusually high in 2004/05 because several pairs raised two broods. In the poisoned area, apparent breeding success was significantly higher (1.35 fledglings/breeding territory) than in the unpoisoned area (0.55 fledglings/ breeding territory); however, this difference was at least partly due to more effort being spent searching for fledglings in poisoned areas. A minimum of 59 fledglings was detected in 2004/05; however, some territories were not checked during the breeding season, and then a series of five tropical cyclones struck Rarotonga in a 4-week period in February/March 2005, which halted our fledgling searches, and caused severe damage to some habitat in the TCA. We expect that many kakerori perished during these cyclones; however, the population on Atiu, which was only affected by two of the five cyclones, survived unscathed. These catastrophic weather events highlighted the vulnerability of single-island endemic birds, and underlined the value of establishing an ‘insurance’ population on Atiu. We recommend that the poisoning regime should return to that used during the ‘recovery phase’ of the kakerori management programme if the August 2005 census reveals that the population has fallen below 220 birds (a 20% decline), otherwise the recent programme of fortnightly poisoning should continue.