Table 3. Temporal parameters of spawning of the sea urchin Strongylocentrotus intermedius inhabiting different bays.
The data are presented as the median and range (in parentheses). “n” is the number of measurements for each parameter. The Mann–Whitney test was used to reveal the differences.
| Parameter | Alekseev Bay | Kievka Bay | Intersex comparison | Interhabitat comparison | ||||
|---|---|---|---|---|---|---|---|---|
| Male | Female | Male | Female | Alekseev Bay | Kievka Bay | Males | Females | |
| Release duration of one gamete batch (min) | 4 (1–90) n = 257 |
5.5 (1–34) n = 22 |
2 (1–13) n = 133 |
3 (1–24) n = 9 |
m < f U = 2106; p = 0.0449 |
m ≤ f U = 2106; p = 0.2847 |
mAlek > mKiev U = 11580; p < 0.0001 |
fAlek ≥ fKiev U = 54.5; p = 0.0517 |
| Total duration of gamete release (min) | 25 (1–92) n = 61 |
17 (5–61) n = 10 |
6.5 (1–45) n = 35 |
7 (2–24) n =5 |
m ≈ f U = 278; p = 0.6101 |
m ≈ f U = 85; p> 0.9999 |
mAlek > mKiev U = 433; p < 0.0001 |
fAlek ≥ fKiev U = 15; p = 0.0856 |
| Time interval between gamete batches (min) | 4 (0–162) n = 201 |
2 (0–35) n = 21 |
2 (0–35) n = 91 |
1 (0–6) n = 7 |
m > f U = 1463; p = 0.0192 |
m ≥ f U = 157.5; p = 0.0905 |
mAlek > mKiev U = 6575; p < 0.0001 |
fAlek ≥ fKiev U = 401.5; p = 0.2148 |
| Total duration of intervals between gamete batches (min) | 23 (0–162) n = 61 |
4.5 (0–50) n = 10 |
7.5 (0–47) n = 35 |
0 (0–11) n = 5 |
m > f U = 141.5; p = 0.0048 |
m > f U = 36.5; p = 0.0337 |
mAlek > mKiev U = 598.5; p = 0.0004 |
fAlek ≥ fKiev U = 50; p = 0.2547 |
| Spawning duration (min) | 59 (8–188) n = 61 |
29 (5–111) n = 10 |
20 (1–59) n = 35 |
8 (2–24) n = 5 |
m > f U = 186; p = 0.04354 |
m ≥ f U = 55; p = 0.2183 |
mAlek > mKiev U = 395; p < 0.0001 |
fAlek ≥ fKiev U = 10.5; p = 0.0799 |