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Mingelbier et al. - St. Lawrence River - Vienna, April 13th 2011 State of fish in a St. Lawrence River under multiple pressures - 2011 Marc Mingelbier.

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Presentation on theme: "Mingelbier et al. - St. Lawrence River - Vienna, April 13th 2011 State of fish in a St. Lawrence River under multiple pressures - 2011 Marc Mingelbier."— Presentation transcript:

1 Mingelbier et al. - St. Lawrence River - Vienna, April 13th 2011 State of fish in a St. Lawrence River under multiple pressures Marc Mingelbier et al. Quebec ministry of Natural Resources and Wildlife, Canada MNRW P. Brodeur, R. Dumas, P. Dumont, D. Hatin, Y. Mailhot, Y. Paradis, N. Vachon Environment Canada J. Morin, S. Martin, O. Champoux, S. Giguère ONEMA, France Y. Reyjol UniversitiesINRS-ETEUQACUQTR U. Laval Non Gov. Org DUC - CIC SABLEtc.

2 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 St. Lawrence river at a glance Large river - rank ~ 20th Large river - rank ~ 20th Length 3260 km long  Danube, Volga & Murray Length 3260 km long  Danube, Volga & Murray Watershed = 1.6 million km2~ Volga & Murray Watershed = 1.6 million km2 ~ Volga & Murray Annual flow = cms  Ganges & Mississippi Annual flow = cms  Ganges & Mississippi ~ 7.5 millions people mainly in the SL watershed ~ 7.5 millions people mainly in the SL watershed Connection between GL & Atlantic Connection between GL & Atlantic Navigation channel Navigation channel > 250 m width > 11.3 m depth Dams Dams Disrupt connection GL & Atlantic Disrupt connection GL & Atlantic Water flow regulation Water flow regulation Altitude 70 m  0 m = rapids Altitude 70 m  0 m = rapids Tide: 3 estuaries freshwater E. + middle E. + marine E. Tide: 3 estuaries freshwater E. + middle E. + marine E. High spatial heterogeneity: High spatial heterogeneity: Lakes vs. narrow sections + archilelagos Lakes vs. narrow sections + archilelagos Major tributaries =  input + water bodies Major tributaries =  input + water bodies

3 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 The St. Lawrence = a multi-rivers system !

4 Mingelbier et al. - St. Lawrence River - Vienna, April 13th / freshwater fish species in SL : resident + diadromous Develop applied research  to field actions Develop applied research  to field actions Protection Protection Restoration Restoration Management Management Many pressures Many pressures Clear degradations Clear degradations Frédéric Back

5 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Yellow perch collapse Despite recommendations since the 1990’s Despite recommendations since the 1990’s In 2010, 90% commercial fishermen re-purchased their licences In 2010, 90% commercial fishermen re-purchased their licences Comm. landings ( )

6 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 American eel decline Migration decline in Cornwall Migration decline in tributaries Increasing avg mass in fisheries

7 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 A river system under pressure ! Since 1850: navigation, dredging & dams Morin & Côté 2003

8 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Urban dvpt & agriculture ! Since 400 yrs, 80% wetlands lost in Montreal area Since 400 yrs, 80% wetlands lost in Montreal area Eutrophication  cyanobacteria Eutrophication  cyanobacteria Effluents  e.g. fish feminisation (oestrogen) + others Effluents  e.g. fish feminisation (oestrogen) + others DELTDELT

9 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Invasive species: round goby  transfert energy + contaminant ? ? ? ? ? ftp://ftp.mrnf.gouv.qc.ca/Public/DEFH/Sfa/ReferencesSL/

10 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Fish : Seine every 1 km shore Gillnet every 1.5 sq. km Time = every 5-7 years + habitat description Fish monitoring in the SLR since 1995 (community + population) Littoral PelagicChannel SeineGillnet

11 Mingelbier et al. - St. Lawrence River - Vienna, April 13th 2011 Index of Biotic Integrity (IBI) (Reyjol et al. in prep) 1. N native species (n= 55) 2. N Catostomidae species (e.g. Catostomus catostomus) 3. N intolerant species (e.g. Hiodon tergisus) 4. % tolerant fish (e.g. Cyprinus carpio) 5. % omnivorous fish (e.g. Carpiodes cyprinus) 6. % insectivorous fish (e.g. Cyprinids; Notropis atherinoides) 7. % piscivorous fish (e.g. Esox lucius) 8. % phytophilous fish (e.g. Fundulus diaphanus) 9. Biomass native fish gillnet, excluding tolerant (e.g. Perca flavescens) 10. DELT (% fish with Deformations, Erosions, Lesions or Tumors) Species occurrence Relative abundance Biomass Special

12 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Index of Biotic Integrity (Reyjol et al. in prep) Bank: South Fragmentation Industrial sewages Bank erosion No fish Very weak Weak Medium Good Excellent Period 1 Period 2

13 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Index of Biotic Integrity : decrease between P1 and P2 (Reyjol et al. in prep) 128 km 10 km 111 km128 km 51% 10 km 4% 111 km 45% Period 1 ( ) 177 km 71% 22 km 9% 50 km 20% Period 2 ( ) Very weak Weak Medium Good Excellent

14 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Multiple pressures in the SLR Agriculture Shore degradation Hydrology Commercial navigation Commercial fisheries Urbanization

15 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Fish sampling Habitat description Pike spawning habitat Approach: 1. Fish & habitat sampling  2. Modelling and mapping 2D modelling to quantify fish habitat Current Temperat ure Vegetatio n

16 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 2D modelling to quantify fish habitat Applications: Applications: Reconstruction of historical series Reconstruction of historical series Test the effects of various climate scenarios (i.e. hot-dry vs hot-wet) Test the effects of various climate scenarios (i.e. hot-dry vs hot-wet) Prepare a new water regulation plan Lake Ontario - SLR system based on Prepare a new water regulation plan Lake Ontario - SLR system based on Fish spring spawning habitat Fish spring spawning habitat Fish summer growing habitat Fish summer growing habitat Protect habitat of endangered species Protect habitat of endangered species ftp://ftp.mrnf.gouv.qc.ca/Public/DEFH/Sfa/ReferencesSL/

17 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Copper Redhorse - A unique fish !! Occurs nowhere in the world except in Southern Quebec Occurs nowhere in the world except in Southern Quebec Moxostoma hubbsi = MOHU: 1/7 spp. of Moxostoma (Catostomidae) Moxostoma hubbsi = MOHU: 1/7 spp. of Moxostoma (Catostomidae) First species designated endangered in Quebec Province in 1999 First species designated endangered in Quebec Province in 1999 Atlas of essential habitats

18 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Success story with lake sturgeon - part 1/2 In 1970’s future was uncertain: overexploitation, small spawning ground, connectivity Changes: New knowledge focused on biology & exploitation Severe management individuals quotas, control of fishermen and wholesaler Spawning habitats protected & restored  2011 = sustainable fisheries!! ftp://ftp.mrnf.gouv.qc.ca/Public/DEFH/Sfa/ReferencesSL/

19 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Success story with lake sturgeon - part 2/2 Riv. des Prairies: spawning site 8000 m 2 ftp://ftp.mrnf.gouv.qc.ca/Public/DEFH/Sfa/ReferencesSL/

20 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20 Conclusions State of fish State of fish Large spectrum of responses due to high natural heterogeneity Large spectrum of responses due to high natural heterogeneity Signs of degradations in the SLR Signs of degradations in the SLR Fisheries collapses Fisheries collapses Low IBI values Low IBI values Goby invasion Goby invasion Signs of improvements Signs of improvements Sustainable population of lake sturgeon Sustainable population of lake sturgeon Stripped bass reintroduction  signs of success Stripped bass reintroduction  signs of success In the future In the future Maintain research applied on management Maintain research applied on management Adapt monitoring to new realities (climate, invaders, new pollutants) Adapt monitoring to new realities (climate, invaders, new pollutants) Refine 2D modelling with additional field data, land use, etc. Refine 2D modelling with additional field data, land use, etc. Protect connectivity Protect connectivity Improve water quality Improve water quality THANK YOU ! ftp://ftp.mrnf.gouv.qc.ca/Public/DEFH/Sfa/ReferencesSL/

21 Mingelbier et al. - St. Lawrence River - Vienna, April 13th /20


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