1st-urban river as dispersal corridors-b
TRANSCRIPT
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OUTLINE
1.Introduction2.Material and Methode
3.Results
4.Conclusion
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Introduction
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UrbanizationGlobal
WarmingBiodeversity
Severely
Role of dispersal corridors
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IntroductionThe possible function of urban rivers as dispersal -
corridors has not been considered in planning,
design, and management approaches for urban
river greenways (e.g., Baschak and Brown, 1995).
They analyze the seed dispersal of three tree
species:
the EuropeanAcer platanoides L.,
the North AmericanAcer negundo L.,
the AsianAilanthus altissima Mill. Swingle.
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Material and MethodeThey use a direct experimental approach visual tracking of
oating seeds had been marked with different colours
They collected fruits randomly chosen trees in Berlin during
the period of natural seed abscission
Measured dry weight [DW], maximum wing length [L ], andmaximum wing width [W] (meansSD for N=50) with the following
results :
Ailanthus altissima (DW=528mg, L =463mm, W =111mm)
Acer negundo (DW=4810mg, L =322mm, W =101mm)
Acer platanoides (DW=17726mg, L =534mm, W =192mm).
Then they tagged samaras with different colours of spray paint
(Aero Decor Colour-Spray, Union Chemie Berlin, Germany).
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Material and Methode (Advanced)
For the eld experiment, they chose the Spree River in the centre
of Berlin with a length of 1200m and a width of 40 80m.
The experiments were carried out on calm (wind velocity
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Material and Methode
An ANOVA was used to determine:
o the species-specic effects
o the effects of turbulence (caused by boats) in the rst
observation sectiono the effects of oating distance on oating capacity (i.e.,
average number of oating fruits per cohort) and the
interactions species distance and species boat
turbulence.
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Results
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The experiment revealed that
the number of released fruits
that arrived at the observation
points declined exponentially.
There is interspecies
differences in the number of
arriving samaras after a water
transport over 200m, but no
inter- specic differences overtransport distances of 20 and
1200m more [Tab. 1&2]
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Results
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Water turbulence decreased the number of oating
samaras in bothAcerspecies, but not inAilanthus.
After 1200m of oating, the interspecic differences
disappeared.
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Results
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There were no speciesturbulence or speciesdistance
interactions.
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Conclusions
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Three main conclusions for urban design and conservation
can be derived from the results:
When designing tree plantings along urban river
embankments or at other sites within the spatial reach of
rivers, the potential of water dispersal for wind-dispersed
species should be considered.
Tree species with a high invasion potential should be
replaced by native tree species.
When individuals of invasive trees with samara-like fruits
rst emerge in natural riparian systems, early eradication
should be considered to prevent a further spread byhydrochory.
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Thank You..
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