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Transcript of Poster Cambridge 4
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8/6/2019 Poster Cambridge 4
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Species Description
Taxonomy: Torrent Duck. 6 subspeci es.
Distribution: Andes from Venezuela to S Chile/Argentina.
Habitat: Fast flowing mountain waters.
Food : Aquatic invertebrates.Breeding: Enduring pairs, Territorial (1km)
Nest : In holes, river banks. 3-4 eggs.
Life story traits: Long li fe bird, low reproductive potential
Status: Not globally threatened.
2 subspecies : vulnerable & endangeredChile : inadequately known
O'Higgins Region : vulnerable
Threats: erosion by deforestation, water pollution,
competition or predation by non-native animals
hydroelectric activity
Habitat selection by Merganetta armata and its sustainable stream flow
requirements in the headwaters of a Chilean Andean river
Claire Pernollet1,2 & Rodrigo I. Meza3
1 Bioamrica Consultores, 2 Laboratorio de Ecologa de Vida Silvestre, 3 Centro de Ecologa Aplicada
STUDY AREA (MAP) :
1 BASIN, 4 RIVERS
2 old hydro power plants
+ 1 under construction
+ 1 project
PART 1 : Habitat selection model
Ducks monitoring: monthly,74 points2007-2010(Map,Graph1)
Habitat variables: altitude, channel shape, channel & river width,
bank river height, distance to the road, position in relation to the
intake, n of rapids, n of emergent rocks, gradient, flow, velocity
indices, densityof ducks in theadjacent points
STATISTICAL ANALYSIS DUCKS DENSITY (Duck/km) = f(X1+X2+X3+X4) Xi = Habitat variable
RIVERS TOGETHER 1) Generalised Linear Models (Table 1) FOR EACH RIVER 2) Chi-square 2 test & Bonferroni confidence intervals
RESULTS TERRITORIALITY:
Negative effect of the presence of conspecifics in adjacent sites
Territoriality may determine spatial segregation
HUMAN DISTURBANCES:
Negative effect of the two intakes. Avoid the presence of roads
FISICAL ATTRIBUTES:
N of rapids, gradient, position upstream the intake, flow & water velocity:
important attributes in their habitat preferences
PART 2 : Hydraulic model
VELOCITY , DEPTH, REYN OLDS NUMBER*
* Reynolds Number : ratio of
inertial forces to viscous
forces, turbulent flow occursat high Reynolds number.
3) Hydraulic model: calculation values
of velocities, depth and Reynolds
for each profiles.
1) Water level, flow gauge and
bathymetric profiles (Map)
2) Diary flows records associated
withselected ducks points with
high frequency of sightings
5) Adjustments by the Chi-square 2 Test.
2ndCRITERION: 3 limits, exceedance probabilities of
95, 90 and 85 % for each parameter.
STATISTICAL ANALYSIS Frequency distribution of each parameters Ducks sightings
4) Parameters Frequency Distribution
and Ducks density.
1st CRITERION: intervals based on the
ducks sightings (minimum and
optimum values for ducks).
Study financed by:
Study made by:
Ducks photographs:
Jos Besa
Graph 1: Ducks monitoring Table 1: Example of GLM.
RESULTS
This is a first approach of habitat suitability estimation. On one hand,
duck monitoring was made before the habitat suitability estimation. On
the other hand, data were insufficient to make robust statistic analysis.
Other studies based on the relationships found here between Torrent
Duck habitat preferencesand physical habitat conditions should be carry
out to ensure an sustainable hydroelectric projects development in theChilean Andeanrivers.
Authors emails:
