why study aquatic ecology of the tropics?
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Why study aquatic ecology of the tropics?
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Pre
sen
ce
of
we
tlan
ds
Northern Canada/Alaska
Continental U.S. EquatorialNeotropics
Nu
mb
er
of
we
tla
nd
sc
ien
tis
ts
Latitude distribution of wetlands based on Matthews and Fung (1987), global lakes and wetlands database (GLWD), and gross wetland map (redrawn from Lehner and Doll 2004)
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Cuenca, Ecuador
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Lago de Josephina
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Lago de Josefina,Cuenca, Ecuador
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Paraguay RiverDrainage BasinPantanal
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The Pantanal
• 140,000 km2 of seasonally inundated floodplain
• West Central Brazil, Bolivia, Paraguay• Ecological sub-regions:
- - river corridors
- gallery forests
- - perennial wetlands and lakes
- - seasonally inundated grasslands
- - terrestrial forests
• Flora influenced by:
- - cerrado (central Brazil)- - chaco (Bolivia, Paraguay)- - Amazon
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minimum
maximum
Source: Ponce 1995
Paraguay River at Ladario: Recorded seasonal max and min stages
Sta
ge
(c
m)
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0
50
100
150
200
250
Dec Feb AprJu
nAug
Oct
Month
Rai
nfa
ll (m
m)
0
5
10
15
20
25
30
35
40
Tem
per
atu
re (
C)
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Caiman yacare
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Capped Heron: Pilherodius pileatus
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Southern Screamer: Chauna torquata
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Jabiru: Jabiru mycteria
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Turquoise-fronted Parrot: Amazona a. aestiva
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Hyacinth MacawAnodorhynchushyacinthinus
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White-faced Capuchin: Cebus capucinus (not in Pantanal)
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Piranha: Serrasalmus spiropleura
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Water hyacinth:Eichhornia crassipes
Giant water lily:Victoria amazonica
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Rooted water hyacinth:Eichhornia azurea
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Cambara: Vochysia divergens
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Environmental Threats in the Pantanal
• Agricultural development
• Mining
• Urban waste
• Navigation projects
• Poaching
• Tourism growth
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Venha conhecer o maior e melhor hotel do Pantanal!
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Paraguay-Paraná Hidrovía
• Would make the 3,440 km Paraguay-Paraná river system navigable year-round from Nueva Palmira (Uruguay) to Cáceres (Brazil).
• Would improve or construct the infrastructure needed to service the increased shipping capacity.
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Timeline• A channelized waterway into the heart of South America is an old idea
and the Paraguay-Paraná have been navigated for many decades.
• Late 1980s: Intergovernmental Committee on the Hidrovía created to oversee the development of this waterway.
• 1990: Publication of an economic feasibility study.
• 1995-1997: Engineering, economic, and environmental assessments of the proposed project.
• 1990s: Cost-benefit “disputes”.
• 1998: Brazil halts plans for construction activities along the Brazilian portion of the waterway.
• Since 2000: Fate of Hidrovía remains uncertain and new plans are underway.
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Remnant river channel
Channelized systemSource: South Florida Water Management District
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Fortney et al. 2004
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Sources: Schaller (1983), Hamilton (1999), Fortney and Gottgens (2005)
Sta
ge (
m)
Fazenda Ipiranga Fazenda Acurizal
4.0
4.5
5.0
5.5
6.0
0
10
20
30
Jan Mar May Jul Sep Nov3.0
4.0
5.0
6.0
7.0
0
5
10
15
20
Jan Mar May Jul Sep Nov
Pre
cip
itat
ion
(cm
)
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Flooded area (km2) at low waterNo change Stage decrease
of 10 cmStage decrease
of 25 cm
NorthernPantanal
(3 subregions)8075 6887 (15%) 4782 (41%)
TotalPantanal
(8 subregions)12219 10785 (12%) 8385 (31%)
[Data from Hamilton, 1999]
Lateral Flood Pulse
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Monthly distributions of annual flood peaks
0
10
20
30
40
50
Percent ofannual
flood peaks
Jan Mar May Jul Sep Nov
Cáceres Ladario Porto Murtinho
Source: Ponce (1995)
Longitudinal Flood Pulse
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Economic benefits Environmental benefits
Sustainable development
? ?
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BioScience, 2001