The reproductive seasonality and gametogenic cycle of Acropora cervicornis off Broward County, Florida, USA
The reproductive seasonality and gametogenic cycle of Acropora cervicornis off Broward County, Florida, USA
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美国佛罗里达州布劳沃德县附近鹿角珊瑚的繁殖季节性和配子发生周期
作者：
Bernardo Vargas;Bernardo Vargas;S. Colley;S. Hoke;J. Thomas
繁殖特性的加勒比造礁珊瑚鹿角珊瑚进行了调查，从2001年4月至2002年10月收集的组织学样本的基础上。卵子发生开始于10月上旬至中旬至11月，精子发生开始于1月至3月。配子发生的开始是交错的，表现出长达约1个月的殖民地内的延迟。在雌雄同体的息肉中，观察到的雄性与雌性性腺的比例接近1：1，成熟的卵母细胞占总性腺体积的70%以上。基于IV期卵的生殖力估计值在每年每平方厘米10.4至21.8 mm 3之间，与A.在波多黎各和其他广播印度太平洋鹿角。基于III期卵黄发生卵母细胞的生育力估计值表明研究中心之间存在统计学显著差异。2001年、2003年和2004年在2300 - 2330 h观察到野外产卵。配子的释放通常发生在7月或8月满月后的第二晚到第七晚。然而，在2003年，多个小规模的配子释放事件发生在一个以上的月球周期。这与7月初发生的满月相吻合。虽然本研究报告了多产配子的产生，但该物种的招募水平较低。因此，高度碎片化的A.颈角类可能严重依赖无性繁殖来维持和扩大种群，干扰后的恢复可能会大大延长。
Reproductive characters of the Caribbean reef-building coral Acropora cervicornis were investigated based on histological samples collected from April 2001 through October 2002. Oogenesis commenced in early to mid-October through November and spermatogenesis was initiated from January to March. The onset of gametogenesis was staggered, exhibiting up to approximately a 1-month delay within colonies. In the hermaphroditic polyps, the observed male-to-female gonad ratio was nearly 1:1 and ripe oocytes represented over 70% of the total gonadal volume. Fecundity estimates based on Stage IV ova ranged between 10.4 and 21.8 mm3 per square centimeter per year, comparable to A. cervicornis in Puerto Rico and other broadcasting Indo-Pacific Acropora. Fecundity estimates based on Stage III vitellogenic oocytes indicated statistically significant differences among study sites. Spawning in field conditions was observed in 2001, 2003, and 2004 from 2300 to 2330 h. Gamete release generally occurred synchronously between nights two and seven after the full moon of July or August. However in 2003, multiple, small-scale gamete release episodes occurred over more than one lunar cycle. This coincided with the full moon occurring early in the month of July. While prolific gamete production is reported in this study, low levels of recruitment have been reported for this species. Thus, the highly fragmenting A. cervicornis may rely heavily on asexual reproduction for population maintenance and expansion, and recovery after disturbance may be greatly protracted.