Subitaneous, diapause, and delayed-hatching eggs of planktonic copepods from the northern Gulf of Mexico: Morphology and hatching success
Subitaneous, diapause, and delayed-hatching eggs of planktonic copepods from the northern Gulf of Mexico: Morphology and hatching success
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DOI：
10.1007/s002270050049
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发表时间：
1997-03-01
期刊：
影响因子：
2.4
通讯作者：
Marcus, NH
中科院分区：
文献类型：
--
作者：
Chen, F;Marcus, NH
通过实验，研究了由新捕获的浮游桡足类或从墨西哥湾北部海底沉积物中回收的卵的形态和孵化成功率。收藏品是在1992年8月至1995年9月期间制作的。描述了9种卵子，这些卵子的直径、颜色和表面属性都不同。卵可分为皮下卵、滞育卵和延迟孵化卵。三个种，白纹伊蚊Labidocera astiva Wheeler，粉虱Acartia tonsa Dana和绒毛中心蜂Centroages velphaatus(Oliveira)只产皮下卵子。孵化成功率在这些物种之间差异很大。奇异唇形虫Labidocera mirabilis Fleminger和Centroages hamatus(Lilljeborg)产生滞育卵和皮下卵。滞育卵的不应期长度在两种内和两种间都有很大差异。第三种休眠卵，延迟孵化，在Labidocera Scotti Giesbrecht和Ponella meadi Wheeler中被发现。延迟孵化卵的存在可能是亚热带物种对季节波动较小的适应反应。根据卵的形态特征和无节幼体的饲养到可识别的阶段，还鉴定了8种甲鱼类桡足类的底栖休眠卵。
Experiments were conducted to examine the morphology and hatching success of eggs, either spawned by freshly caught planktonic copepods or recovered from bottom sediments in the northern Gulf of Mexico. Collections were made between August 1992 and September 1995. Eggs of nine species were described and these differed in their diameter, color and surface attributes. Three types of eggs were distinguished: subitaneous, diapause, and delayed-hatching. Three species, Labidocera aestiva Wheeler, Acartia tonsa Dana, and Centropages velificatus (Oliveira) produced only subitaneous eggs. Hatching success varied greatly among these species. Two species, Labidocera mirabilis Fleminger and Centropages hamatus (Lilljeborg) produced diapause eggs and subitaneous eggs. The length of the refractory phase of the diapause eggs differed greatly both within and between these two species. A third type of dormant egg, delayed-hatching, was recognized in Labidocera scotti Giesbrecht and Pontella meadi Wheeler. The existence of delayed-hatching eggs may be an adaptive response of subtropical species to less seasonal fluctuation. Based upon morphological characteristics of the eggs and rearing of nauplii to an identifiable stage, benthic dormant eggs of eight species of calanoid copepods were also identified.