Research
| Title： | Sexual maturity, seasonal estrus, and gestation in female Indo-Pacific bottlenose dolphinsTursiops aduncusinferred from serum reproductive hormones |
|---|---|
| First author： | Zhang, Peijun; Wei, Zhengzhi; Hui, Suk-Wai; Abel, Grant; Martelli, Paolo; Hao, Yujiang; Li, Songhai |
| Journal： | INTEGRATIVE ZOOLOGY |
| Years： | 2020 |
| DOI： | 10.1111/1749-4877.12491 |
| Abstract： | Reproductive hormones in serum concentrations of progesterone, estradiol, and testosterone in female Indo-Pacific bottlenose dolphins (Tursiops aduncus,n= 12) housed in Ocean Park Hong Kong were investigated in the present study. Results showed that, onset of puberty of captive Indo-Pacific bottlenose dolphins was at 5 years while sexual maturity was at 6. Average serum progesterone concentrations in non-pregnant sexually mature individuals was 0.33 (0.25-0.97) ng/mL (interquartile), significantly higher than in immature ones 0.26 (0.25-0.38) ng/mL. This study found significant difference in serum estradiol concentrations between individuals at the onset of puberty (9.5 +/- 1.7 pg/mL, +/- SD) and not (below detection limit 9 pg/mL). A slightly seasonal breeding pattern, with progesterone values tend to be higher from February to October (0.38 [0.25-1.07] ng/mL) was inferred. During pregnancy, serum progesterone concentrations range from 10.54 +/- 8.74 ng/mL (indexed month post-conception [IMPC] 0) to 25.49 +/- 12.06 ng/mL (IMPC 2), and display a bimodal pattern with 2 peaks in early- (25.49 +/- 12.06 ng/mL, IMPC 2) and late-pregnancy (21.71 +/- 10.25 ng/mL, IMPC 12), respectively. Serum estradiol concentrations can seldom be detected in early-pregnancy and increase constantly in mid- (9.45 +/- 1.83 pg/mL) and late-pregnancy (11.88 +/- 3.81 pg/mL), with a spike (15.45 +/- 6.78 pg/mL) 1 month prior to delivery. Serum testosterone concentrations elevate significantly in IMPC 7 (0.36 +/- 0.10 ng/mL) compared to other months (0.16 +/- 0.10 ng/mL) of the year. The present study provides normal concentration profiles for some reproductive hormones in female Indo-Pacific bottlenose dolphins and can contribute to the breeding monitoring of this species. Also, our study would shed further light on the reproductive physiology of small cetaceans. |
