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Landscape restoration
John Innes
Neil Fitzgerald, Olivia Burge
Matakana
25 Nov. 2018
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Diverse definitions spanning ecology, geography and society*
• Heterogeneous land area of interacting ecosystems
• Areas at kilometres-wide human scale of perception
* Wikipedia
‘Landscape’
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core
matrix
edge
fragment/site corridor?
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‘Ecological integrity’ *
• INDIGENOUS DOMINANCE
- ecosystems contain, and are shaped by, native plants and animals
- key element is self-regeneration
• SPECIES OCCUPANCY
- species that could and should be present are present
• ENVIRONMENTAL REPRESENTATION
- distribution of native biota across climates, soils, geologies
* Lee, McGlone, Wright et al. 2005, LC0405/122
Objectives of restoration
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Cheri van Schravendijk-Goodman
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What INDIVIDUAL birds need…
Demographic process Habitat Management
Adult survival – roost
– feed
Food
Low predators
Browser control
Predator control
Plant/retain vegetation
Nesting Food for female
Inverts for young
Low predators
Browser control
Predator control
Plant/retain vegetation
Retain old trees
Nest boxes
Chick/subadult survival Low predators
Food
Predator control
Browser control
Natal dispersal Connectivity
Low predators
Plant/retain vegetation
Predator control
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Populations and communities…
Demographic process Habitat Management
Population persistence Adequate area OR
Connectivity
Plant/retain vegetation
Community processes
- Competition
- Mixed flocking
- ?
Restore species
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1. Bird movement
• Seasonal movement – e.g. tui may fly 20 km in winter
• Natal dispersal – from where a bird fledges to where it first nests e.g.
NI kokako, 1600 m, n=174; 15 km for Wenderholm robins
• Breeding dispersal – occasional movements adult birds make between
nesting locations e.g. tui 53 km
• Post-translocation dispersal e.g. Rakiura robin crossed 800 m over
water, cf 100 m limit for dispersing NI robins*
Other key factors: Gap-crossing, predation vulnerability.
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Species Pasture* or sea#
gap-crossing (km) Natal dispersal (km) Other seasonal movements (km)
Bellbird/korimako 22# 22 20
Brown kiwi 0.33* 20 0.26–1
Fantail/pīwakawaka 0.15# Unknown 0.1
Grey warbler/riroriro Unknown 0.9 0.1
Harrier/kahu 22# 100+ 100s
Hihi 0.1−0.3* 0.9-1.7 0.5
Kākā 25# 25 100+
Kererū 33# Unknown 100
Kingfisher/kotare Unknown Unknown 2
Little spotted kiwi Unknown Unknown 0.1
Long-tailed cuckoo 8,000+# Unknown Migratory 8,000+
NZ falcon/karearea 20* 10 2.8–19
NI robin/toutouwai 0.11* 15 0.2
NI tīeke 0.25# 0.8 50–200
Red-crowned kākāriki 100# 2.5 20
Rifleman/tītipounamu 0.3* 1.7 0.15
Shining cuckoo 5,000# Unknown migratory 5,000+
Silvereye/tauhou 100+# 0.16 50–300
Tomtit/miromiro 3# Unknown 0.12–0.16
Tūī 20* 5 20
Whitehead/pōpokatea 0.1* 0.35 0.3
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Cape to City project, Hawkes Bay
Burge et al.
5 km
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Cape to City: Habitat quality
NI robin tui r-c kakariki
Burge et al.
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Cape to City: area-weighted habitat value
NI robin tui r-c kakariki
Burge et al.
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Cape to City: patch connectivity
NI robin tui r-c kakariki
Max. dispersal: 110 m 20 km 100 km
5 km
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Robin dispersal
600
400
200
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0
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Distance (m)
0 10000 20000 30000
110 m
Burge et al.
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• Most important patches for robin and tui were forestry plantations
that are ready for clearance.
• Enhancing connectivity for birds like robins is difficult
• Mobile birds can reach existing habitat – they just need more of it
1. Retain exotic forestry and BIG OLD TREES
2. Assess land ‘available’ for habitat creation
– Riparian, roadside, other?
– Plant food trees anywhere for tui, bellbird, kaka, kereru
3. Non-forest species:
– Pāteke, pied stilt, fernbird, spotless & marsh crake, bittern, dabchick
in wetlands
– Pipit, falcon, pūtangitangi in rough pasture
– Banded & NZ dotterel on beaches
So what?
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• More important than previously acknowledged?
• Interacts with predation, habitat area, disease, parasites
• Kaka, kakariki, kereru, kokako nesting needs good food
• Habitat area vs quality?
• Ship rat, possum control increases bird food, reduces predation and
birdslaughter, limits nest disturbance
2. Food supply
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• Five native plants preferred by tui, korimako/bellbird and kereru:
Kohekohe, hinau, tree fuchsia, fivefinger and puriri
• Native plants preferred by korimako:
Alseuosmia macrophylla, rewarewa, Phormium cookianum,
Rhabdothamnus solandri, kamahi
• Native plants preferred by kereru:
Titoki, tawa, miro, supplejack, poroporo
Planting ‘paddock trees’ will help mobile frugivores
bellbird
Ch
ris
Sm
uts
-Ken
ned
y
kereru
tui
Native plant species
frequently eaten by tui
(NZ-wide)
Fruit
Flowers/nectar
1 = weedy
(a)
Introduced plant species
frequently eaten by tui
(NZ-wide)
Fruit
Flowers/nectar
1 = weedy
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Banks Peninsula*
• More native birds cf exotics in native forests cf plantations
.. with increased forest area in the landscape
.. with taller vegetation
• Native forest bird abundance in native forests overall neutral re %
exotic forest in the landscape (but +ve rifleman, –ve kereru)
3. Landscape composition
*Barnagaud et al. 2014 Ecology 95; Deconchat et al. 2009 Forest Ecology & Mgmt 258S
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• Native forest decline from 90% of landscape to 1% -->60% decline in
bird species richness if no matrix plantations
.. but only 15% decline when 99% matrix is plantation
• Effect strongly non-linear – most benefit accrued when 10% matrix is
plantation
• No benefit for kereru
OSNZ Atlas data (national)*
Ruffell, Clout, Didham 2017 Ecography 40
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• Native birds declined rapidly below 5-10% forest cover in landscape
(within 1 km of each site)
• Tomtits absent below 25% forest cover; silvereye and kereru no
effect
• Pest control ineffective unless strong
• Plantations most valuable in low-cover (5-10%?) landscapes
• Options: large-scale planting, let scrub revert, plantations, corridors
195 locations north of Auckland*
Ruffell & Didham 2017 NZ Jnl Ecology 41
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• Fence
• Weed control
• Plant to replace or maintain canopy dominants eg tawa, mangeao
• Plant to restore lost species eg rimu, hinau, northern rata, epiphytes
• Browser and predator control
4. Restoring habitat quality
House mouse
Brushtail possum
Cat
Hedgehog
Ship rat
Stoat
Norway rat
Feral goat
Red deer
Ferret
Weasel
Fallow
deer
Rabbit
Dog
Ng
a M
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es
Ng
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an
u I
mag
es
Stoat
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Unfenced mainland sanctuary
ship rats
stoat
possum
ferret
kokako Ng
a M
an
u I
mag
es
robin tree weta
S. W
ills
NI brown kiwi whio kaka
M. R
oth
well
Kakari
ki G
am
es
Pest-fenced ‘island’
Tuatara
Hihi
Tieke
Little spotted kiwi
Giant
weta
Kakapo
Duvaucel’s
gecko
Maungatautari
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Other restoration ideas
Low pest fences
Win
gsp
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Ruru nest boxes
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Small fragments are made for lizards and inverts!
Oligosoma chesterfieldWest Coast, South Island
Tre
nt
Bell
Mokopirirakau sp.
Southern North Island
Tre
nt
Bell
Naultinus sp.
North Cape, North Island
Tre
nt
Bell
Eastern speckled skink
Cape Kidnappers
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• Benefits of managing forest cover vs pest control are context
dependant
• Depends on current forest cover and intensity of pest control
• Challenges our knowledge of factors limiting populations
• Increasing native forest area extremely difficult cf pest control
• Corridors likely to benefit some birds BUT there need to be travelling
birds AND somewhere to go
• Meanwhile: fence, weed, plant, poison, trap, plan, translocate, laugh,
drink...
Conclusions
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Seasonal availability and use of introduced plant fruit (red), and flowers (orange) frequently eaten by bellbirds. Plant use from Rasch & Craig (1988); Williams & Karl (1996); Robertson et al. (1999); Higgins et al (2001); Medway (2006); Anderson (2011); Pattemore & Anderson (2013). Plant phenology from New Zealand Plant Conservation Network (www.nzpcn.org.nz) and iNaturalistNZ (www.inaturalist.nz).1 Known or likely weed species (M Smale pers com.).
1 = weedy
Native plant species
frequently eaten by
bellbird (NZ-wide)
Fruit
Flowers/nectar
X = not on tui list
1 = weedy
(a)
x
x
x
x
x
(b)
Native plant species
frequently eaten by
bellbird (NZ-wide)
Fruit
Flowers/nectar
X = not on tui list
1 = weedy
xx
x
x
x
x
x
x
Introduced plant species
frequently eaten by
kereru (NZ-wide)
Fruit
Flowers/nectar
Foliage
1 = weedy
Native plant species
frequently eaten by
kereru (NZ-wide)
Fruit
Flowers/nectar
Foliage
1 = weedy
(a)
Native plant species
frequently eaten by
kereru (NZ-wide)
Fruit
Flowers/nectar
Foliage
1 = weedy
(b)