Islands biodiversity program: New Zealand case study...2007/05/18 · New Zealand as case study •...
Transcript of Islands biodiversity program: New Zealand case study...2007/05/18 · New Zealand as case study •...
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David R. Towns
Islands biodiversity program: New Zealand case study
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Outline
• Global importance of New Zealand islands• Management of threats to flora and fauna
from invasive alien species (mammals)• Four examples as case studies• National strategies for island management• Challenges ahead: balancing people and
nature tested against CBD focal areas
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Islands as a resource
• From 29-52oS, distance of 2 800 km
• 735 islands > 1 ha
• About 250 managed by Department of Conservation
• Two large archipelagos World Heritage sites
Source: Parkes & Murphy (2003).
40°S
50°
170° 180°
30° Kermadec Islands
Campbell Island
Fiordlandislands
0 500 km
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Global hotspots for biodiversity
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Why is NZ a biodiversity hotspot?
Of 34 hotspots ranks:• 19 for endemism of plants and vertebrates
to genus • 2 for endemism to families (vertebrates)• 2 for coverage in protected areas (27.5%)• 1 for high level protection (22.1%)
Source: Mittermeir et al. (2004)
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New Zealand’s terrestrial oddities
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New Zealand: “seabird capital”
• Total world seabird fauna: 350 spp• Recorded from NZ: 140 spp (39%)• Breeding in NZ: 84 spp (23%) • Largest fauna anywhere with 35 (42%)
endemic
Source: Taylor 2000
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Biodiversity oversights35% of world fauna
54% of world fauna
40% of world fauna
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Why is NZ a threat hotspot?
• On CI list: 4 for species of threatened birds
• 40% of avifauna extinct
• Birds (+reptiles, amphibians and invertebrates) all threatened by invasive alien species
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Extinction
Suppression
Bellbird
Parakeet
Megaherbs: Stilbocarpa
Hadramphusweevil
Greater short-tailed bat
Snipe
Bush wren
Saddleback
Lesser short-tailed bat
Robin
Banded railFernbird
Extirpation
Big South Cape IslandShip rat invasion
1962
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Island invasive mammals*
• House mouse (14)• Pacific rat (35)• Ship rat (18)• Norway rat (42)• Weasel (1)• Stoat (20)• Ferret (1)• Hedgehog (1)(Success claimed)
• Cat (10)• Brushtail possum (15)• Rock wallaby (3)• Goat (19)• Sheep (4)• Red deer (1)• Pig (11)• Cattle (4)*Source: ISSG
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Cumulative area cleared of mammals
0
5000
10000
15000
20000
25000
30000
35000
1910 1930 1950 1970 1990 2010
Years
Are
a (h
a)
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Islands free of mammal pests
Island area (ha) No.
10 000 – 100 000 6
1000 – 10 000 23 100 – 1000 57
<100 646
Source: Parkes & Murphy (2003)
with additions to 2007
Cleared of pests (Total %)
1 (17)
6 (26)17 (37) 62* (34)
*Includes reinvaded islands
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Summary: by number/area
• 162 naturally pest free islands, 158 of which (97%) < 100 ha
• By area, 2162 ha naturally pest free• More than 60 “permanently” cleared of all
introduced pests• About 29 000 ha added (1400% increase)
Unprecedented achievements?
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Huge: Campbell Island
• 52oS• Area: 11330 ha• Nature Reserve• W. Heritage site• Cattle to 1984• Sheep to 1991• Cats died out 1990s• Norway rat to 2001• Cost NZ$2m
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Campbell known for:Rock-hopper penguins Flowering megaherbs
Albatrosses & mollymawks
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Campbell Is losses:
• Merganser – total extinction• Parakeet – total extinction• Flightless teal • Snipe • Pipit• Burrowing seabirds including prions and several
species of petrels• Rock hopper penguins resident, 90% loss• Flightless crickets, giant slugs, large weevils rare
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Campbell Island gains
C.I. Teal
Pipit
C.I. Snipe Grey backed storm petrel
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Hot: Raoul Island
• 29oS• Area: 2938 ha• Nature Reserve• Goats to 1972-1984• Pacific rat to 2002• Norway rat to 2002• Cats to 2004• Goat cost NZ$ 1m• Rat/cat cost NZ$ 1.2m Raoul Island crater lakes
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Raoul known for:
Kermadec nikau palm
Sooty terns
Raoul eruption 1964
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Raoul losses
• Megapode, fruit pigeon, forest parrot? Extinct
• Parakeet (locally lost)• At least 6 species of seabirds (locally lost)• Endemic plants heavily suppressed by
goats• Sooty terns, Kermadec petrel, black-
winged petrel, wedge-tailed shearwater heavily suppressed by cats
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Raoul Island gains
Hebe breviracimosa
Kermadec parakeet
Black-winged petrel
Wedge-tailed shearwater
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Hard: Little Barrier Is
• Area: 3083 ha• Nature Reserve
• Cats to 1977-80• Pacific rats to 2004
• Cats cost ????• Pacific rats: NZ$ 0.5m
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Little Barrier known for:
400 spp plants 13 spp reptiles
23 spp forest birds
2 spp bats
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Plus….
Gigantic invertebrates
Wetapunga
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Little Barrier losses
• Snipe (extinct) (rats?)• Grey-faced petrels local loss (cats)• Black petrels suppressed (cats)• Saddleback local loss (cats)• >5 species seabirds local loss (cats & rats)• Cooks petrel suppressed (cats & rats)• Tuatara suppressed (rats)• >6 species lizards suppressed (rats)
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Little Barrier gains:
0
10
20
30
40
50
60
70
80
90
100
1997 1998 1999 2000 2001 2002
Bre
edin
g su
cces
s (%
fled
ging
)
Codfish
Little Barrier
Chevron skink resighted 2007
Tuatara release 2006
Cook’s petrel recovery
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First: Korapuki Island
• Area: 18 ha• Wildlife Sanctuary
• Pacific rats to 1986• Rabbits to 1987
• Pacific rats cost: $6800
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Korapuki known for:
Nothing much in particular except:
• Highly modified vegetation• Regularly burned up until beginning of 20th
Century• Absent large invertebrates• Depleted reptiles
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Korapuki gains:
Diving petrel recovery
Duvaucel’s gecko recovery
Robust skink reintroduction
Tusked weta
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Eradication benefits
• Plants: > 40 endemic species (Great King)• Invertebrates: 13 species• Amphibians: 2 species (50%)• Reptiles: 26 species (33%)• Terrestrial birds: 29 species (40%)• Seabirds: 12 species (7%)• Mammals: 1 species (bat) (50%)
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Summary of achievements
• Four examples from high end protected islands
• Three large, complex and recent but still with some rapid changes
• Positive responses from >60 vertebrate species
• But: overlooks complexities of goals with different land tenures
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On the horizon
Rangitoto-Motutapu Is: 3900 ha
Brush-tailed possum (E), Rock wallaby (E)Mouse (WF), Ship rat (WF), Norway ratHedgehog (WF), Rabbit (WF), Cat (WF)Stoat (WF)
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Complexities of land tenure
Of the ca 70 cleared islands:
11 reserve types• 4 different Acts of
Parliament• Private-Public
partnerships (esp with Maori)
• Iwi (Maori) land• Private freehold land
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Island management • Natural recovery: resident species
responses, recolonisation, reappearance• Reintroductions: assisted recovery
36 high-end island reserves• Introductions: species management
• Recreation: community led projects e.g. planting and reintroductions
• Protection: historic sites and landforms
15 low-end accessible island reserves
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Catering for broad goals
• National island management strategy• Central theme: ecological integrity.
“The full potential of indigenous biotic and abiotic features, and natural processes, functioning in sustainable communities, habitats and landscapes.”
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Eco
log
ical
inte
gri
tyHigh
Low
Public access
Low
High
Reserve goals
Natural heritage: Nature, Special Areas
RecreationScenic, National Parks
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Focus: ecological integrity
• Caters for nature heritage AND use• Sliding scale high to low integrity reflects
community aspirations• Bundles multitude reserve types into 6
functional categories• Defines attributes depending on levels of
integrity• Defines measures of success for each
functional category
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New Zealand as a case study
How do New Zealand approaches and experience align with Island biodiversity program of work?
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Island biodiversity
1. Protection:
Land/species/genes
3. Biosecurity
2.Sustainable
use
7.Support
6. Sharing
resources
5.TEK
4.Goods+servicesPeople
Resources
Governments
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NZ islands(DOC)
1. >30% reserves
High-lowintegrity
3. Island
BiosecuritySOP
2.Island
Managementstrategy
7.PII,
NZAID
6. Treaty of Waitangi
5.DOC –iwi
TEK
4.Strategic directionsPeople
Resources
Governments
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Viwa Island mammal and cane toad eradication
(60 ha)
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New Zealand as case study
• High levels of management achievement• Most managed islands uninhabited• Island management complicated by
inherited ad hoc legislation• Relationships with Maori defined in Treaty
of Waitangi and claims process• Private-public partnerships developing
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Challenges for NZ
• Settlement of Treaty of Waitangi claims• Technical constraints overcome• National island management strategy used• Outcome measures developed for
management with differing goals• Rigorous reporting systems applied• Large inhabited islands with resistant
minorities managed effectively
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Challenges for CBD islands program?
Your call!