Lorena Rivas Factors affecting the distribution of the Darwins rhea in the Auca Mahuida Reserve in...
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Lorena Rivas Factors affecting the distribution of the Darwin’s rhea in the Auca Mahuida Reserve in Argentine Patagonia
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Transcript of Lorena Rivas Factors affecting the distribution of the Darwins rhea in the Auca Mahuida Reserve in...
Lorena Rivas
Factors affecting the distribution of the Darwin’s rhea in the Auca Mahuida Reserve in Argentine Patagonia
STUDY AREA
Darwin´s RheaRhea pennata pennata
1.10 m
Adapted to run
Flightless
Diet:
Omnivorous
SocialStructure: Gregarious
Reproduction:Territorial malesHarems of 4-5 females
10-50 eggs per nestEggs incubated by the male
Almost simultaneous hatching
Habitat:Darwin's
Rhea lives in areas of open shrub in the grasslands of Patagonia
Status: Near threatened (IUCN)• Hunting• More
predation due to changes in trophic communities
• Habitat degradation due to livestock overgrazing
• Egg collection
Landholdings
Livestock
Oil industry
Oil trails
(Sheep Units/km2)
Mean ±SE ±1.96*SE Absence Presence
Absence/Presence Darwin´s rhea
-2
0
2
4
6
8
10
12
14
16L
ive
sto
ck d
en
sity
(S
he
ep
Un
its/k
m2
)
p= 0.88
Mean ±SE ±1.96*SE Absence Presence
Absence/Presence Darwin´s rhea
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8O
il tr
ail
de
nsi
ty (
km/k
m2
) p= 0.14
What we are going to record…
Rhea density in Payunia and Auca Mahuida reserve and intermediate lands
Oil trail densityLivestock density Habitat qualityRelative
abundance of predators
To i
To all of you
To WCSTo all the people who works
with me in Argentina
Contact: [email protected] / [email protected]
