太平洋牡蛎配子和精子人卵的扫描电镜观察及胚胎发育的初步研究     

田传远  梁英  王如才  任素莲  于瑞海  赵厚均 《海洋科学进展》2000,18(2):51-55

通过扫描电镜观察,太平洋牡蛎精子由头部、中段和尾段组成.精子全长约21.6μm,尾段长约18.2μm,末端观察到"针眼"样结构;头部最大处的直径约2.6μm;中段直径约1.1μm;未成熟精子尾段中部出现膨大,该处直径约0.3μm.卵呈梨形;卵的直径约为41.9μm.卵表面有微绒毛组成的皱折结构,可见卵黄膜孔.卵质收回时,在卵表面卵柄处可见明显的树枝状结构.受精后,受精卵表面的卵黄膜剥离处可见较多数量的皮质小泡.在水温21.2～23.5℃,精卵混合34min时,释时出第1极体;1h22min时,放出第2极体;21h55min时,胚胎发育至初期D形幼虫.  相似文献   

Spatial and seasonal variation in reproductive characteristics and spawning of southern calamary (Sepioteuthis australis): spreading the mortality risk     

Moltschaniwskyj  Natalie A.; Steer  Michael A. 《ICES Journal of Marine Science》2004,61(6):921-927

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A Multi-Generation Schmakeria poplesia Culturing System for Use in Ecotoxicological Study     

HUANG Ying  ZHU Liyan  QIU Xuchun  QI Benjin  ZHANG Tianwen 《中国海洋大学学报(英文版)》2009,8(1)

Crustacean zooplankton form the keystone link between primary producers and fish stocks in marine and estuary ecosys-tems. We have established a multi-generation cultivation system for zooplankton with which future experiments on the biological effects of pollutants in marine and estuary environments can be better performed. A population of calanoid copepod, Schmakeria poplesia, was collected in December 2003 and maintained in a static system through all stages (eggs to adults). The population ex-hibited an average developmental time of 13.6d in conditions corresponding to the natural enwronment (water temperature 20℃ salinity 15). A series of experiments were performed to examine copepod egg production and hatching success as functions of food type and feeding concentration. Results in our study showed that Isochrysis galbana was more favored for the reproduction of cope-pods than Phaeodactylum tricornutum, and 10×104cellsmL-1 was the most practical algae concentration. We have demonstrated that the Schmakeria poplesia population can be maintained in the laboratory through multiple generations. In addition, methods to control egg production through changes in food concentration have been established, making it feasible to control the start date of exposure experiments or the timing of the collection of offspring to initiate a new generation.  相似文献   

Fatty acids dynamics during embryonic development in genus Uca (Brachyura: Ocypodidae), from the mangroves of Inhaca Island,Mozambique     

Paulo Torres  Gil Penha-Lopes  Luís Narciso  Adriano Macia  José Paula 《Estuarine, Coastal and Shelf Science》2008

Variations in egg volume and fatty acid (FA) content through embryogenesis were evaluated in Uca species from Inhaca island, Mozambique. Egg volume increased 96.1%, 93.3%, 84.2%, 92.9%, 96.3%, respectively, in Uca annulipes, Uca inversa, Uca urvillei, Uca chlorophthalmus and Uca vocans (p < 0.05). Fatty acid content decreased through embryogenesis, showing its importance as fuel during embryonic development. Major fatty acids were 16:0, 18:0, 16:1n-7, 18:1n-9, 18:1n-7, 18:2n-6, 20:5n-3 and 20:4n-3. Unsaturated fatty acids (UFA) and saturated fatty acids (SFA) were used up at a similar rate for U. annulipes and U. inversa contrarily to the other three species. Within the UFA, MUFA were more consumed than PUFA for all species except U. chlorophthalmus. The high values detected for fatty acid trophic markers (essential C₁₈ and C₂₀ PUFAs) and odd-numbered fatty acid suggest that Uca species occupy medium trophic level, primarily omnivores and scavengers/detritivores consuming algae common in the intertidal habitats. The fatty acid consumption pattern during embryonic development was essentially similar between species with some variation as expected, as FA content varies within species mainly due to female feeding ecology, nutritional and physiological conditions, differential demands on resource allocation and geographic and seasonal variations in embryonic development.  相似文献   

广东南雄白垩系及恐龙蛋到鸟蛋演化研究   总被引：3，自引：1，他引：2  

方晓思  李佩贤  张志军  张显球  林有利  郭盛斌  程业明  李震宇  张晓军  程政武 《地球学报》2009,30(2):167-186

首次实测了南雄盆地一条完整的白垩系剖面;沿剖面在66个层位中采集到蛋化石, 新建了1个恐龙蛋科, 2个属及6个种;在厘定南雄盆地和丹霞盆地的岩石地层后, 统一提出了一套白垩纪地层单位名称。另外通过对羽状蛋化石的研究, 揭示出恐龙蛋到鸟蛋的进化, 是由于蛋壳棱柱层产生了变异, 出现了从‘层状结构’到‘羽状结构’的转变;与现代鸟禽类对比后确认, 恐龙蛋的棱柱层相当于鸟禽类的鳞片层(带);具有羽状结构的蛋化石是恐龙蛋演化到鸟蛋的一种中间类型。  相似文献   

Implications of meso-scale eddies caused by frontal disturbances of the Kuroshio Current for anchovy recruitment   总被引：3，自引：1，他引：2  

Nakata  Hideaki; Kimura  Shingo; Okazaki  Yuji; Kasai  Akihide 《ICES Journal of Marine Science》2000,57(1):143-152

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温度对虎斑乌贼受精卵孵化及幼体存活的影响   总被引：1，自引：0，他引：1  

刘建勇  许光林  简润超  陈均 《广东海洋大学学报》2010,30(6)

研究海水温度对虎斑乌贼(Sepia pharaonis)受精卵孵化及幼体存活的影响。结果表明:虎斑乌贼胚胎发育的最低和最高临界水温为20℃和32℃,孵化的最适温度范围为24~30℃。水温[t(℃)]与孵化率[H(%)]间的函数关系可表示为:H=-5.333+2.583 t(R2=0.247,F=7.213,P<0.01);虎斑乌贼幼体对温度的耐受力最低和最高临界温度分别为12和32℃,存活最适温度范围为22~28℃。温度[T(℃)]和处理时间[t(h)]及其交互作用均对虎斑乌贼的存活率[S(%)]有显著的影响(P<0.01),其函数关系可表示:S=60.526+1664 T-0.588 t(R2=0.572,F=39.407,P<0.01)。  相似文献   

STUDY ON MIXIS POTENTIAL OF ROTIFER RESTING EGGS ( BRACHIONUS PLICATILIS ) WITH DIFFERENT COLLECTION TIMES AND DIFFERENT PRESERVATION PERIODS     

周利  郑严  相建海 《中国海洋湖沼学报》2001,(3)

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Sole egg distributions in space and time characterised by a geostatistical model and its estimation variance     

Petitgas  Pierre 《ICES Journal of Marine Science》1997,54(2):213-225

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两种微藻对中华哲水蚤繁殖的影响——基于饵料生化组成分析     

刘梦坛  金鑫  李超伦 《海洋科学》2015,39(12):1-7

在春季,以中肋骨条藻和海洋原甲藻培养中华哲水蚤,以饥饿培养作为对照,测定了饵料的脂肪酸和挥发性不饱和醛类的组成和含量、雌体的产卵率和卵的孵化率,试图探讨藻类生化组成对桡足类繁殖的影响。结果表明,中肋骨条藻单不饱和脂肪酸、?16脂肪酸的含量相对较高,而海洋原甲藻则具有更高含量的总脂肪酸、多不饱和脂肪酸、?ω3、?ω6、?18脂肪酸。中肋骨条藻和海洋原甲藻分别测得了6种和3种不饱和醛类,二者醛类总含量分别为1438.95μg/g和114.58μg/g。在饥饿的情况下,中华哲水蚤的产卵会停止。中华哲水蚤在中肋骨条藻和海洋原甲藻培养下并没有表现出产卵率和孵化率的差异,一方面说明并非所有的硅藻都会对桡足类的繁殖产生抑制作用,另一方面说明藻类进入桡足类体内以后并未因其生化组成的差异对卵的孵化产生影响。中肋骨条藻培养下中华哲水蚤具有更高的死亡率,表明硅藻在浓度较高时会对桡足类的存活产生影响。  相似文献