Circadian and lunar gamete release in Fucus vesiculosus in the atidal Baltic Sea
Circadian and lunar gamete release in Fucus vesiculosus in the atidal Baltic Sea
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DOI：
10.3354/meps110195
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发表时间：
1994
影响因子：
2.5
通讯作者：
S. Andersson;L. Kautsky;A. Kalvas
中科院分区：
文献类型：
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作者：
S. Andersson;L. Kautsky;A. Kalvas
在恒温、光照17 h：暗循环7 h、微自然光照条件下，田间每12 h或4 h计数一次，室内每24 h计数一次。在野外和实验室对照实验中均证实了两周一次的节律，主要是在满月和新月前2天释放卵子，但有一个小周期的振幅不等的迹象。鸡蛋的最高日释放量通常在18:00至22:00时。脱水未发现影响鸡蛋释放的模式，并且在田间未发现与温度或水位波动相关。提出了水疱F. vesiculosus的内源性时钟，并提出和讨论了不同的携带因子。我们进一步认为，在波罗的海潮汐环境中，观察到的节律性对像F. vesiculosus这样的雌雄异株物种配子释放的协调具有很大的适应价值，因为该物种几乎总是在水下生活。从生态学的角度来看，配子的循环释放意味着在繁殖期内，繁殖和招募的次数减少到几次，而之前的假设是几个月。这一信息对于成功管理波罗的海这一具有重要生态意义的物种可能是至关重要的，近几十年来，由于污染，这一物种的数量严重减少。
Released eggs from Fucus vesiculosus were counted every 12 or 4 h in the field and every 24 h in laboratory experiments at constant temperature and a 17 h light: 7 h dark cycle, mimiclung natural light conditions. A fortnightly rhythm was confirmed both in the field and in controlled laboratory stu, with a main egg release 2 d before full and new moon, but with indication of a minor weekly period of unequal amplitude. The highest daily release of eggs was typically found from 18:OO to 22:OO h. Dehydration was not found to influence the pattern of egg release and in the field no correlation was found with temperature or water level fluctuations. An endogenous clock in F. vesiculosus is suggested and different entraining factors presented and discussed. We further suggest that the observed rhythmicity is of great adaptive value for coordination of gamete release in a dioecious species like F. vesiculosus in the atidal environment of the Baltic Sea, where this species occurs almost always submerged. Ecologically, the cyclic gamete release means that reproduction and recruitment are reduced to a few occasions during the reproductive period, which was earlier assumed to be several months long. This information may be crucial in the successful management of this ecologically important species in the Baltic Sea which has been severely reduced in abundance in recent decades due to pollution.