umr carrtel research center on trophic networks and lake ecosystems
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UMR Carrtel
Research Center on Trophic Networks andLake Ecosystems
- Unit- Lake Observatory- Some results
Bernard MONTUELLE
2
1-1. Global scientific context
functionning of alpine lakes ecosystems related to their watershed and the atmosphere
the effect of drivers , especially in the context of the present re-oligotrophisation dynamics and the climate change.
Integers the global change issues
Land U
sesP
ollutions
RegulationsStandarts
Climate
- 3 Sub systems and specific functionnings
-Fluxes and internal exchanges
- External drivers and exchanges
Lake
Water uses(fishing, recreational…)
flux./proc.
Flux./proc.
Watershed- rivers
ACTIVITES HUMAINES
soils
Flux./proc
Atmosphere
T, light, deposits,
3
Issue 1: Fluxes and processes at the interfaces
Issue 2: Structuring ecological processes
Issue 3 : Quality and management of the lakes and their ressources (environmental drivers changes)
► biogeochemical hot spots► upstream-downstream fluxes ► fluxes modelling
Lac
usages(pêche…)
fluxflux
Bassin versant - affluents
sols
flux
ATMOSPHERE
T, lumière, dépôts
► measurements► quality indicators► helping managers
Biodiversity
Functions
Structure
3 organisation
levels
► role of biodiversity► biological models►productivity- trophic fluxes►ecotoxicology
1-1. Global scientific context
4
2 – Operational issues
PAST status Today status Surveys
and data
LEMAN MESOTROPHIC(from1957)
CIPEL
BOURGET MESOTROPHIC(from 1990)
CISALB
ANNECY OLIGOTROPHIC OLIGOTROPHIC(reference)
(from 1980) SILA
Annecy
Bourget
Léman
Re-oligotrophisation and climate vs fishing
Micropollutants (new or old)
Changes of land uses (practices..) Gobal management (lake+watershed)
Current questions(Ministery –Water Agency –Lake managers)
1950-1980* eutrophication
1980-1990: *control of P fluxes* re-oligotrophication
Taking into account the managers/stakeholders questions
Lake uses:- fishing- water resources- recreational- ecological services
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Head (1)
Watershed group:Watershed,
fluxes, sediments(5)
BIO-FEEL group:Biodiversity,
Functions and Evolution of Lake Ecosystems (5)
Environmental Research Observatory
Technical group (University of Savoie(3 )
Chemistry lab(4)Biodiversity and Molecular Biology Group (5 )
Outdoor experimental devices
(2)
Sampling group(5)
Secretariat andAccounting (2) Resource Center (1) Computing and database
(2) Workshop
(2)
45 full time 20 scientists 10PhD + post
3.1 The Unit and it’s scientific topics Thonon
Chambéry
6
3.2 The Unit and it’s scientific topics
Group WaterShed: Transferts and functionning at interfaces
Main topic: The Watershed as a transfer system to the lakes♦ Functional spatialization of watershed ♦ Fluxes from terrestrial to aquatic ecosystems
Lac
usages(pêche…)
fluxflux
Bassin versant - affluents
sols
flux
ATMOSPHERE
T, lumière, dépôts
Group » Biodiv- Funct »: Ecological processes and biological responses
Main topic: « Functionning and regulation of trophic networks» ♦ Pelagic communities ♦ Functional role of biodiversity
Group « Fish & Ecotox »: Environmental quality and Resources management
Main topic: « Halieutic and stocking »♦ Drivers of fish productivity (lakes and rivers)
Main topic: « Algal and microbial ecotoxicology (biofilms, ..) » ♦ Contamination dynamics and impacts (pesticides)
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ACADEMIC (60 to 70 %)
► Producing generic knowledges (25 internat. papers/year + books)
► Building environmental Observatory: Alpine Lake Observatory
► Contributing to scientific networks
RESULTS for SOCIO-ECONOMIC Instances and Public stakeholders (20%)► Expert reports (Soils, Taxonomy), study reports, assessments,..► Decision-making assistance, developing partnerships (lakes, fishing, agriculture),producing documents ( technical guides, reports, …)
RESULTS for education and training for research (<10%)►University and engineer Schools.►PhD formation►PhD: ± 3/year
3.3 The Unit and it’s scientific topics
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OBJECTIVES • Organize data collection, their storage, their use and their accessibility• Scrutinizing, understanding and modelling the trajectories and the ecological mechanisms controling the lake systems exposed to changes in anthropic and climatic pressures, at a 10 years time steps ».
The Environmental Research Observatory « Alpine Lakes »(LTER)
Le Bourget Mesotroph
(re-oligotrophisation)
Léman Mesotroph
(re-oligotrophisation
Annecy Oligotroph
±1950
± 1980
± 1990
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Observatory
Long term limnology
Short and mid term processes
Associated projects
- Long term surveys- Physicochemical and biological processes controling water quality - Ecological trends- Consequences of global change
- Small mountains lakes- Micropollutants ecodynamics
> 10 years
1< < 10 years
1010
Parameters - Physico-chemistry - Phytoplancton- Zooplancton - Bacterio & virioplankton - Chlorophyll- Primary production- Probes- Weather - Fish catches (annual)
Information Systems – data base
data
Database
Public access
11Multiparameters Probes
1920 1960 1970 1980 1990 2000 2010
Perch O+
Zooplancton (net 2)
Bacterioviroplancton
Primary production
Meteo data
Flurorometric probe
Fishes surveys
Zooplancton (net 1)
Phytoplancton
Physico-chemistry
Transparency (Secchi)
General conditions
Léman
On paper ……………………………………………….
Annecy
On paper………………………………………………………………….
{…..on paper …………….}
Bourget
Historical data
12
0
20
40
60
80
100
120
56 59 62 65 68 71 74 77 80 83 86 89 92 95 98
ANNECY
LEMAN
BOURGET
µg/l PO4Increasing pollution Control of wastewater
Long term dynamics of lakes: Eutrophication - Reoligotrophication
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Phosphorus = limiting factor
Bottom -up control Anneville et al., 2007 Journal of¨Plankton Research)
Long term dynamics of lakes: Trophic network changes
Abondance
Abondance
Abondance
Temps
Temps
Temps
PO4
EffetEffet
RéponsRéponsee
RéponsRéponsee
Abondance
Temps
RéponsRéponsee
Abondance
Temps
EffetEffet
Abondance
Temps
RéponsRéponsee
Abondance RéponsRépons
eeA
bondance RéponsRépons
ee
050
100150200250300
Bio
volu
me
(m
l.m-2)
050
100150200250300350
Cat
che
s (t
ons)2.52.72.93.13.33.53.7
74 80 86 92 98 04Log
(B
iov+
1)
(µg.
l-1)
PO
4 (
µg/
L)
020406080
100
74 80 86 92 98 04
Lake Leman Top-Down control
Changes in fish diversity(oligotrophy)
Coregonus albula
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LACS
Thank you for attention
http://www.dijon.inra.fr/thonon
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