Table 2 The lengths of periods between median spawning dates and median mortality dates and their influence on reproductive output. Reproductive effort lost due to mortality was calculated as the difference between the total marsupium load during all spawning events and the marsupium load produced during the reproductive window standardized by the total reproductive output, and multiplied by the proportion of dying females.
River | Timing | Spawning vs. mortality window | Total | Ratio | Prop. of F dying | Rep. effort lost due to mortality | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Year | 1st spawning event [Md] | Death dates [Md] | Length [days] | % of F spawning (all F) | No. of broods per F [mean] | Sum of marsupia contents per F [mean] | Marsupia contents in season [mean] | Marsupia contents in window to total | |||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Biała | 2015 | 20 Apr | 25 May | 35 | 53 (47) | 1.7 | 144 | 354 | 0.41 | 0.22 | 0.13 |
2016 | 15 Apr | 1 Jun | 46 | 93 (44) | 2.3 | 217 | 381 | 0.57 | 0.09 | 0.04 | |
mean | 17 Apr | 28 May | 41 | 73 | 2.0 | 180 | 368 | 0.48 | 0.16 | 0.08 | |
Czarna | 2019 | 12 Apr | 24 May | 42 | 47 (34) | 2.1 | 203 | 454 | 0.45 | 0.19 | 0.11 |
San | 2015 | 28 Apr | 07 Jul | 70 | 100 (21) | 3.5 | 317 | 342 | 0.93 | 0.00 | 0.00 |
2016 | 3 May | 09 Jul | 67 | 100 (58) | 3.3 | 246 | 290 | 0.85 | 0.04 | 0.01 | |
2017 | 11 May | 20 May | 9 | 27 (85) | 0.4 | 39 | 545 | 0.07 | 0.04 | 0.04 | |
2018 | 5 May | 14 Aug | 101 | 100 (126) | 5.0 | 315 | 315 | 1.00 | 0.02 | 0.00 | |
2019 | 1 May | 10 May | 9 | 3 (68) | 0.4 | 39 | 353 | 0.11 | 0.42 | 0.37 | |
mean | 3 May | 20 May | 51 | 66 | 2.52 | 191 | 369 | 0.59 | 0.10 | 0.05 | |
Warkocz | 2019 | 27 Mar | 6 Jun | 69 | 84 (31) | 3.4 | 240 | 240 | 1.00 | 0.38 | 0 |
2021 | 10 Apr | 10 Jun | 61 | 100 (37) | 1.81 | 171 | 171 | 1.00 | 0.47 | 0 | |
mean | 3 Apr | 08 Jun | 65 | 92 | 2.61 | 205 | 205 | 1.00 | 0.43 | 0 | |
All | mean | 14 Apr | 28 May | 50 | 67 | 2.49 | 196 | 364 | 0.60 | 0.15 | 0.08 |
