Table 1 The timing of reproduction in populations of U. crassus and its relationships with the number of broods and the total reproductive output of females.
1st spawn date of an individual mussel [day/month] | Total spawning period | No. of broods per season vs. 1st spawn date rs (N ind.) P | Marsupium volume filled with larvae rs (N ind.) P | |||||
|---|---|---|---|---|---|---|---|---|
River | Year | The earliest date | The latest date | 1st spawn period [days] | The very last spawning date | Total rep. period [days] | ||
1. | 2. | 3. | 4. | 5. | 6. | 7. | 8. | 9. |
San | 2015 | 11 Apr | 15 Jun | 65 | 7 Jul | 87 | -0.45 (21) 0.07 | -0.62 (15) 0.01 |
2016 | 7 Apr | 10 Jun | 64 | 1 Aug | 116 | -0.39 (58) 0.004 | -0.51 (47) < 0.001 | |
2017 | 5 Apr | 18 Jul | 104 | 19 Jul | 105 | -0.79 (85) < 0.001 | -0.59 (80) < 0.001 | |
2018 | 10 Apr | 2 Jun | 53 | 4 Jul | 85 | -0.44 (126) < 0.001 | -0.44 (107) < 0.001 | |
2019 | 23 Mar | 19 Jun | 88 | 12 Jul | 111 | -0.27 (68) 0.03 | -0.32 (61) 0.01 | |
mean | 5 Apr | 18 Jun | 75 | 14 Jul | 101 | |||
Biała | 2015 | 1 Apr | 10 Jun | 70 | 18 Jul | 108 | -0.60 (47) < 0.001 | -0.45 (40) 0.003 |
2016 | 20 Mar | 23 May | 64 | 30 Jul | 132 | -0.52 (44) < 0.001 | -0.34 (41) 0.030 | |
mean | 26 Mar | 1 Jun | 67 | 24 Jul | 120 | |||
Czarna | 2019 | 18 Mar | 8 Jun | 82 | 9 Jul | 119 | -0.54 (34) 0.003 | -0.27 (27) 0.18 |
Warkocz | 2019 | 14 Mar | 8 May | 55 | 18 Jun | 96 | -0.08 (31) 0.76 | -0.09 (21) 0.69 |
2021 | 20 Mar | 20 May | 61 | 20 May | 61 | -0.46 (37) 0.005 | -0.46 (36) 0.005 | |
mean | 17 Mar | 14 Jun | 58 | 2 Jul | 78 | |||
