Lake Sturgeon (Acipenser fulvescens), four populations: COSEWIC assessment and status report 2017

Figure 1. Designatable units delineation based on freshwater biogeographic zones and haplotypes. Pie charts show the population average ancestry for 14 standardized microsatellites K=2 from STRUCTURE
Figure 2. Western Hudson Bay DU showing the terrestrial ecozones and locations of officially named rapids and falls.
Figure 3. Saskatchewan-Nelson River DU showing the terrestrial ecozones and locations of officially named rapids and falls.
Figure 4. Southern Hudson Bay-James Bay DU showing the terrestrial ecozones and locations of officially named rapids and falls.
Figure 5. Great Lakes-Upper St. Lawrence DU showing the terrestrial ecozones and locations of officially named rapids and falls.
Figure 6. Lake Sturgeon distribution in North America based on historical and contemporary data.
Figure 7. Fecundity of Lake Sturgeon.
Figure 8. Length-at-age curves for four different growth trajectories. Based on aged fish from 0 to 10-14 years and incremental growth from recaptured fish using the largest recorded females to approximate maximum age.
Figure 9. Length-weight relationships for ‘robust’ females and ‘slender’ females.
Figure 10. Historical and contemporary Lake Sturgeon distribution in the Churchill River (DU1), showing the location of falls/rapids, dams, topography, and current management units.
Figure 11. Historical and contemporary Lake Sturgeon distribution in Lake Winnipeg and tributaries (DU2), showing falls/rapids, dams, topography, and current management units.
Figure 12. Historical and contemporary Lake Sturgeon distribution in the Winnipeg River (DU2), showing falls/rapids, dams, topography, and current management units.
Figure 13. Historical and contemporary Lake Sturgeon distribution in the Saskatchewan River (DU2), showing falls/rapids, dams, topography, and current management units.
Figure 14. Historical and contemporary Lake Sturgeon distribution in the Nelson River (DU2), showing falls/rapids, dams, topography, and current management units.
Figure 15. Historical and contemporary Lake Sturgeon distribution in the Southern Hudson Bay-James Bay (DU3), showing falls/rapids, dams, and topography.
Figure 16. Historical and contemporary Lake Sturgeon distribution in Lake Superior and its tributaries (DU4; MU1-MU4), showing falls/rapids, dams, topography, and current management units.
Figure 17. Historical and contemporary Lake Sturgeon distribution in Lake Huron and tributaries (DU4), showing falls/rapids, dams, topography, and current management units.
Figure 18. Historical and contemporary Lake Sturgeon distribution in Lake Erie and tributaries (DU4), showing falls/rapids, dams, topography, and current management units.
Figure 19. Historical and contemporary Lake Sturgeon distribution in Lake Ontario and Upper St. Lawrence River (DU4), showing falls/rapids, dams, topography, and current management units.
Figure 20. Historical and contemporary Lake Sturgeon distribution in the Ottawa River (DU4), showing falls/rapids, dams, topography, and current management units.
Figure 21. Historical and contemporary Lake Sturgeon distribution in the St. Lawrence River and tributaries (DU4; MU6), showing falls/rapids, dams, topography, and current management units.

List of tables

Name and classification table
Table 1. Designatable units identified for Lake Sturgeon in this report and the previous COSEWIC report (COSEWIC 2006).
Table 2. Detailed information provided by the pre-COSEWIC meeting participants by DU (DF 2016a,b), identifying survey information, quantitative abundance, qualitative abundance, recruitment, trajectory, and threats.

List of appendices

Appendix 1. Threats assessment for Lake Sturgeon: Western Hudson Bay populations.
Appendix 2. Threats assessment for Lake Sturgeon: Saskatchewan-Nelson River populations.
Appendix 3. Threats assessment for Lake Sturgeon: Southern Hudson Bay-James Bay populations.
Appendix 4. Threats assessment for Lake Sturgeon: Great Lakes-Upper St. Lawrence populations.

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Lake Sturgeon (Acipenser fulvescens), four populations: COSEWIC assessment and status report 2017

Table of contents

Lake sturgeon

Western Hudson Bay populations - Endangered
Saskatchewan-Nelson River populations - Endangered
Southern Hudson Bay-James Bay populations - Special concern
Great Lakes-Upper St. Lawrence populations - Threatened

2017

Table of contents

List of figures

List of tables

List of appendices

Page details

Lake Sturgeon (Acipenser fulvescens), four populations: COSEWIC assessment and status report 2017

Table of contents

Lake sturgeon

Western Hudson Bay populations - Endangered Saskatchewan-Nelson River populations - Endangered Southern Hudson Bay-James Bay populations - Special concern Great Lakes-Upper St. Lawrence populations - Threatened 2017

Table of contents

List of figures

List of tables

List of appendices

Page details

Western Hudson Bay populations - Endangered
Saskatchewan-Nelson River populations - Endangered
Southern Hudson Bay-James Bay populations - Special concern
Great Lakes-Upper St. Lawrence populations - Threatened

2017