flatfish reveals a common structuring oceanic front
TRANSCRIPT
![Page 1: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/1.jpg)
Comparative population genetics of
flatfish reveals a common structuring
oceanic front
Sara Vandamme
![Page 2: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/2.jpg)
© K Vanhalst
© H. Hillewaert, K. Vanginderdeuren
![Page 3: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/3.jpg)
Study organisms Scophtalmidae: Brill & Turbot Soleidae: Sole
Intro Approach Results Conclusion
![Page 4: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/4.jpg)
Species Brill Turbot Sole Plaice
Adult depth 70-80m 70-80m < 50m < 100m
Spawning location
offshore offshore inshore offshore
Spawning time Febr-Aug May-July March-May Dec-Mar
Adult density at spawning site
1/2x 106 m² 1/2x 106 m² 4/104 m² 1/104 m²
Nursery location Shallow coastal
Pelagic duration 2 months > 2 months 1 month 3-4 months
Study organisms: Life history traits
Intro Approach Results Conclusion
![Page 5: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/5.jpg)
Flatfish: Life cycle
Intro Approach Results Conclusion
Adults (age 3+) Time: March-May
Eggs (<11 days) Larvae (> 4 weeks)
Postlarvae migrate
![Page 6: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/6.jpg)
Approach Results Conclusion © H Hillewaert Rijnsdorp et al. 1992
Flatfish: Life cycle
![Page 7: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/7.jpg)
Connectivity
• Understand population dynamics • Understand the population resiliency to exploitation • Identify areas that need protection • Design marine protected areas ⇒ Effective fisheries management
Intro Approach Results Conclusion
![Page 8: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/8.jpg)
Opportunity
Intro Approach Results Conclusion
• Co-distributed • Turbot and brill are congeneric species → more similar ? • Lower abundance → higher FST ? • Space & ENV effect ? • One well studies species
⇒ Seascape genetics and LHT explain connectivity ?
![Page 9: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/9.jpg)
Approach
Intro Approach Results Conclusion
Gene
DNA strain
Genetic Marker
ENV
SPACE TIME
Seascape Genetics
![Page 10: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/10.jpg)
Genetic structure turbot
Intro Approach Results Conclusion
Vandamme et al. 2014
![Page 11: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/11.jpg)
Intro Approach Results Conclusion
Vandamme et al. 2014
Genetic structure turbot
![Page 12: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/12.jpg)
Comparative genetic structure
Intro Approach Results Conclusion
Of course.. nothing is what it seems
TURBOT
SOLE
BRILL
Vandamme et al. in submission
![Page 13: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/13.jpg)
Seascape genetics
Intro Approach Results Conclusion
Stratification index
Oxygen concentration
Surface salinty
Depth pycnocline
Surface temperature
Primary production
![Page 14: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/14.jpg)
Turbot Brill Sole Turbot adaptive
Baltic Sea North Sea
ENV 0,004 0,002 0,002 0,095 0,023
SPACE 0,012 0,004 0,001 0,103 0,017
TIME 0,005 0,000 0,001 0,078 0,021
E + S + T 0,016 0,004 0,003 0,116 0,033
Intro Approach Results Conclusion
Seascape genetics
• Space & ENV largest effect in sole & brill • Magnitude effect variables is different between species
• TIME only relevant in turbot Vandamme et al. in submission
![Page 15: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/15.jpg)
Turbot Brill Sole Turbot adaptive
Baltic Sea North Sea
ENV 0,004 0,002 0,002 0,095 0,023
SPACE 0,012 0,004 0,001 0,103 0,017
TIME 0,005 0,000 0,001 0,078 0,021
E + S + T 0,016 0,004 0,003 0,116 0,033
Intro Approach Results Conclusion
Seascape genetics
• Baltic Sea overall stronger effects • Time largest effect in Baltic Sea • Same magnitude for all 3 variables
![Page 16: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/16.jpg)
Seascape genetics
Intro Approach Results Conclusion
Stratification index: brill
Oxygen concentration
Surface salinty
Depth pycnocline: sole
Surface temperature: turbot
Primary production
![Page 17: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/17.jpg)
Summary
Intro Approach Results Conclusion
Species Brill Turbot Sole Plaice
Adult depth 70-80m 70-80m < 50m < 100m
Spawning location
offshore offshore inshore offshore
Spawning time Febr-Aug May-July March-May Dec-Mar
Adult density at spawning site
1/2x 106 m² 1/2x 106 m² 4/104 m² 1/104 m²
Nursery location Shallow coastal
Pelagic duration 2 months > 2 months 1 month 3-4 months
![Page 18: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/18.jpg)
Summary
Intro Approach Results Conclusion
Vandamme et al. in submission
![Page 19: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/19.jpg)
Management implications
Intro Approach Results Conclusion
Vandamme et al. in submission
![Page 20: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/20.jpg)
Management implications
Intro Approach Results Conclusion
• Turbot most sensitive: • Reduces age and size @maturity • Genetic diversity lowest • Northern spawning ground • Adaptation in Baltic Sea ?
• Other flatfish might benefit
Vandamme et al. in submission
![Page 21: flatfish reveals a common structuring oceanic front](https://reader034.vdocuments.net/reader034/viewer/2022050306/626f46ad5074bd7bbd355c1d/html5/thumbnails/21.jpg)
Comparative population genetics of
flatfish reveals a common structuring
oceanic front
MANY THANKS TO…