Table 2 Field observations of life cycle of Margaritifera dahurica and comparison of glochidia release timing in the northern and southern parts of the range.
River* | Drainage | Date | Observations | Life cycle stage |
|---|---|---|---|---|
Ussury River [6] | Amur River | 20 July 2012 | Empty marsupia | Eggs maturation in gonades |
Tyrma River [5] | Amur River | 31 August 2015 | Mature glochidia in marsupia and glochidia releasing from disturbed mussels | Mussels are ready to release glochidia |
Ingoda River [1]** | Ditto | End of September | Ditto | Ditto |
A tributary of the Komissarovka River [6] | Khanka Lake = > Amur River | March 2017 | Glochidia of different size on the host gills: difference between the smallest and the biggest larva is more than four times | Growth of glochidia |
A tributary of the Komissarovka River [6] | Khanka Lake = > Amur River | 25 May 2017 | Glochidia on the host gills: still different in size, but difference between the smallest and the biggest larva is around two times | Glochidia near to the end of metamophosis |
