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Cook Islands : summary of species on the 2008 IUCN Red List

Climate Change Resilience, Island and Ocean Ecosystems, BRB

Available Online

IUCN

The Pacific islands of Oceania cover almost 15% of the worlds surface and are characterised by a high degree of ecosystem and species diversity. The region is characterised by thousands of isolated small coral atolls and higher volcanic islands, which has led to the high diversity of species found today. In fact, the number of plants and animals found nowhere else on earth (endemic species) is extremely high - often up to 90% for particular groups. Often, these rare and endemic species are adapted to specialised habitats and limited to small areas of a few islands. With economic and cultural dependence on the natural environment very high in the Pacific islands, along with a rapidly expanding human population, there are ever increasing demands on the regions natural resources. Plant and animal species are therefore vulnerable to extinction from climate change, competition from introduced (invasive) species and human impacts such as habitat destruction, over-harvesting of species and pollution.

Cook Islands Fisheries Resources Profiles: research and information division, Cook Islands Ministry of Marine Resources

Island and Ocean Ecosystems

Available Online

Pacific Islands Forum Fisheries Agency

Cook Islands is composed of 15 islands with a total land area of approximately 23,600ha. which fall naturally into northern and southern groups. The total population at the 1991 census was 18,552, the overwhelming majority of whom live in the southern group, principally on Rarotonga. The area of the Exclusive Economic Zone (EEZ) is over 1.8 million square kilometres. Though the recent rapid development of a black pearl industry in Cook Islands has been impressive, in general terms the marine resources in Cook Islands' EEZ have yet to be fully developed. Fisheries and marine resources are predominantly utilised by Cook Islanders on a subsistence and artisanal basis. Responsibility for these resources is vested in the (Minister) Ministry of Marine Resources (MMR), headquartered at Avatiu, Rarotonga. Outer islands with fisheries personnel are Pukapuka, Manihiki, Aitutaki, Penrhyn, Palmerston, Mitiaro, and occasionally, Mangaia.

Conservation of kakerori (Pomarea dimidiata) in the Cook Islands in 2003/04

Available Online

Robertson Hugh A

Saul, Edward K

In 1989, the kakerori (Pomarea dimidiata) was one of the 10 rarest bird species in the world, with a declining population of just 29 birds. During each breeding season since then, rats have been poisoned within the 155 ha of forested hill country they occupy in the Takitumu Conservation Area in southeastern Rarotonga. As a result, the kakerori population has rebounded, with a minimum of 292 birds found on Rarotonga in August 2003. In 2001/02, the emphasis of management shifted from the .recovery. of kakerori to a programme aimed at .sustaining. the population at 250.300 individuals. The major changes were an experimental reduction in rat poisoning effort to a level where recruitment of kakerori balances annual mortality, and a series of transfers to establish an insurance population on the island of Atiu. In 2003/04, all bait stations were filled fortnightly, rather than the previous mix of weekly and fortnightly refills. This reduced labour costs by 30% to 32 person days, and used a total of 39 kg of Talon® (active ingredient brodifacoum), which was only 13% of the maximum annual poison use over the same area during the .recovery. phase of the programme. Breeding success was high (0.91 fledglings/ breeding territory), even in the unpoisoned areas, and a record total of 80 fledglings was detected. The fortnightly poisoning regime offers promise as an effective, cheaper and less toxin-intensive method than that used previously, and so we recommend maintaining this regime in 2004/05, so that the longerterm effects can be assessed. A third and final batch of 10 young kakerori was transferred to Atiu Island in August 2003. This .insurance. population is becoming well established; the five breeding pairs monitored in 2003/04 each raised two fledglings, and a minimum of 15 birds was found in May.June 2004 in the small part of the island that was searched.

Conservation of kakerori (Pomarea dimidiata) in the Cook Islands in 2005/06

Available Online

Robertson Hugh A

Saul Edward K

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 in the Takitumu Conservation Area (TCA) of southeastern Rarotonga. As a result of conservation management, the kakerori population rebounded, with up to 300 birds being recorded on Rarotonga and Atiu in 2004/05. The southern Cook Islands was, however, hit by five tropical cyclones over a 4-week period in FebruaryMarch 2005, and much of the forest on exposed faces, spurs and ridges (traditional kakerori habitat) was severely damaged. The population survived remarkably well, with a minimum of 274 adults known to be alive in the TCA in August 2005. An additional 17 adults were found on Atiu between August 2005 and March 2006. The main\ casualties of the cyclones on Rarotonga appeared to be young birds (13 years old) and very old birds (> 20 years old). Because the population on Rarotonga remained well within the management target of 250300 individuals, rat poisoning was again done fortnightly, as in the previous 2 years. Breeding productivity was exceptionally poor in 2005/06, mainly because of nesting failures or early fledgling deaths caused by abnormally wet conditions during the main fledging periods. Nests were more exposed to the elements because the cyclones had extensively defoliated the canopy. Furthermore, rats were often seen foraging during the day, apparently struggling to find food (few trees were fruiting). Only 22 fledglings were definitely seen in 2005/06; however, some territories were not checked or poorly checked during the breeding season, and some fledglings may have dispersed to better vegetated sites. We recommend that rat control should return to the weekly poisoning regime used during the 19892001 recovery phase of the kakerori management programme if the August 2006 census reveals that the population has fallen below 220 birds (a 20% decline from pre-cyclone levels). Otherwise the regime of the sustainable management phase (fortnightly poisoning) should continue.

Conservation of kakerori (Pomarea dimidiata) in the Cook Islands in 2004/05

Available Online

Robertson Hugh A

Saul Edward K

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 250300 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.

Conservation of kakerori (Pomarea dimidiata) in the Cook Islands in 2006/07

Available Online

Robertson Hugh a.

Saul. Edward K.

In 1989, the kakerori (Pomarea dimidiata) was one of the 10 rarest birds in the world with a declining population of just 29 individuals living in forested hill country in the Takitumu Conservation Area (TCA) of south-eastern Rarotonga, Cook Islands. Following 12 years of rat poisoning, the population had increased to 255 birds in August 2001. The programme then shifted from species recovery to sustainable management of the Rarotonga population at 250 to 300 birds. The rat poisoning effort was reduced, and an insurance population was established on Atiu. By August 2004, following the reduction of poisoning from weekly to fortnightly, and the transfer of 30 youngsters to Atiu in 200103, there were 281 birds on Rarotonga and 25 on Atiu. The southern Cook Islands were hit by five tropical cyclones in a four-week period in FebruaryMarch 2005, and forests on Rarotonga were severely damaged. Kakerori survived the storms remarkably well, but the main effect was observed in the following breeding season (2005/06), when nesting success on Rarotonga was exceptionally poor. Reduced canopy cover caused nests to be exposed to abnormally wet conditions, and lack of fruit meant that rats were exceptionally hungry. Only 31 yearlings were known to be alive in August 2006about half the expected numberand annual mortality of banded birds (25%) was the highest since management began. The kakerori population on Rarotonga fell 8% from 275 birds in August 2005 to a minimum of 254 birds in August 2006. The situation was better on Atiu, with the population growing from about 32 adult birds in 2005/06 to a minimum of 37 adult birds in 2006/07, and an Atiu-bred pair nested successfully for the first time. The 2006/07 breeding season on Rarotonga was moderately successful, with a minimum of 51 fledglings found. Because the sustainable management regime of fortnightly rat poisoning in the TCA was only just adequate in giving protection to adult kakerori, the annual poisoning programme was modified by adding rounds of interim poisoning in April and July 2007 aimed at reducing rat and cat numbers before the breeding season.

Report to the Government of the Cook Islands on Invasive Plant species of environmental concern

Available Online

Flynn Tim

Space James C

The Government of the Cook Islands requested assistance from the US Department of Agriculture, Forest Service, Institute of Pacific Islands Forestry, to conduct a survey of invasive plant species of environmental concern, similar to surveys previously conducted in Micronesia, American Samoa, Nine, Samoa and Tonga. The survey was carried out from 11 March through 1 April 2002. The islands of Rarotonga, Aitutaki, 'Atiu, Mangaia, Ma'uke and Miti'aro were surveyed. Species reported by the Cook Islands Natural Heritage Project were used for the other islands (Manuae, Manihiki, Nassau, Palmerston, Penrhyn, Pukapuka, Rakahanga, Suwarrow and Takutea) as well as for some of the uncommon cultivated species on the surveyed islands.

Cook Islands : national environment startegic action framework 2005 - 2009 = E kura mana to tatou aorangi

Environmental Monitoring and Governance

Available Online

National Environment Service

The mandate for developing the National Environment Strategic Action Framework 2005-2009 was given by the Environment Act 2003. The framework provides guidance and direction for achieving sustainable social and economic progress for the Cook Islands by utilising our natural resources and environment wisely. It aims to sustain efforts generated from growing environmental awareness to protect, conserve and manage our environment and natural resources.

Conservation of Kakerori (Pomarea dimidiata) in 2002/2003

Island and Ocean Ecosystems, BRB

Available Online

Robertson, Hugh A.

Saul, Edward K.

In 1989, the kakerori (Pomarea dimidiata) was one of the 10 rarest bird species in the world with a declining population of just 29 birds. During each breeding season since then, rats have been poisoned within the 155 ha of forested hill country they occupy in southeastern Rarotonga. As a result, the kakerori population has rebounded, with a minimum of 259 birds being found on Rarotonga in August 2002. In 2001 and 2002, 20 yearlings were transferred to Atiu in the first two of three planned annual transfers to establish an insurance population. In January 2003, three pairs of kakerori were found on Atiu, and successful breeding was proven with the discovery of six island-bred (unbanded) birds, belonging to at least two of the pairs. In 2002/03, the emphasis of management in the Takitumu Conservation Area shifted from the recovery of kakerori to a programme aimed at sustaining the population at about 250 individuals. The key to this work was the experimental reduction of rat poisoning effort, so that 30 territories had the standard weekly refills of poison bait stations, 29 received a fortnightly refill, and 20 received no rat control. As expected, breeding success was significantly better in poisoned areas (with an average of 0.95 fledglings per breeding territory) than in unpoisoned areas (with an average of 0.30 fledglings per breeding territory). This reduced rat control programme took 23 person days each week for 15 weeks, and used a total of 43 kg of Talon® (active ingredient brodifacoum), which was about 20% of peak poison use during the recovery phase of the programme. The fortnightly poisoning regime offers promise as an effective, cheaper and less toxin-intensive method than that used previously.

Cook Islands biodiversity strategy and action plan (NBSAP) : 2002

Island and Ocean Ecosystems, BRB

Available Online

McCormack, Gerald

The Cook Islands signed the Convention on Biological Diversity at the Earth Summit in 1992. As a Party to the Convention, the Cook Islands Government committed itself and its people to conserve its biodiversity, to use it in a sustainable manner, and to share its benefits in an equitable manner. It also committed itself to control invasive species (the weeds and pest animals in natural ecosystems and agricultural systems), and to reduce the likelihood of future invasions.

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