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brood pouch
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  育儿囊
     Histological changes of a brood pouch in a reproductive period and ovoviviparous property were examined in Hippocapus japonicus .
     报道了日本海马(Hippocampusjaponicus)生殖期雄性成体育儿囊组织结构变化和卵胎生特点。
短句来源
  “brood pouch”译为未确定词的双语例句
     Histological Observation of Brood Pouch and Ovoviviparous Property of Hippocapus japonicus
     日本海马生殖期育儿囊组织结构变化和卵胎生特点的组织学观察
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  相似匹配句对
     Histological Observation of Brood Pouch and Ovoviviparous Property of Hippocapus japonicus
     日本海马生殖期育儿囊组织结构变化和卵胎生特点的组织学观察
短句来源
     Histological changes of a brood pouch in a reproductive period and ovoviviparous property were examined in Hippocapus japonicus .
     报道了日本海马(Hippocampusjaponicus)生殖期雄性成体育儿囊组织结构变化和卵胎生特点。
短句来源
     POUCH DIORTHOSIS AND PREVENTION OF ITS COMPLICATIONS
     眼袋矫正术及并发症的防治
短句来源
     Savings and safety in pouch packaging
     食品软管包装的解决方案
短句来源
     On the Reproduction of Agkistrodon acutus & Artificial Brood
     尖吻蝮蛇的繁殖行为和人工孵化研究
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  brood pouch
mutica emerged from the brood pouch at a body length of 1.33 mm and moulted at 5.0-11.0 day intervals.
      
In contrast, a weak decrease in the egg production and an increased abortion of embryos from the brood pouch of females was observed, the later indicating a failure in parental care.
      
Brood pouch of parthenogenetic females was found to contain 11.6?±?1.0 and 10.2?±?0.3 embryos in the spring and summer form individuals, respectively.
      
The amplexial groove, dorsal ornamentation, and the form of the brood pouch have characteristics that can be used in species identification.
      
The results suggest that female brood pouch morphology is the most useful morphological character to discriminate between the three Caribbean populations.
      
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Three hemdvoel 300 individuals of Oxyurella tenuicaudis of both sexes and 3 ephjppia were selected from the plankton sample collected from a small pond in Yongsheng, Yunnan province on 26 Aug. 1982. Among them 265 are females occupied 88.3% of the total number of individuals. The body lengths are between 0.24 to 0.50 mm, but most of them are from 0.36 to 0.45mm. There are 110 females with eggs or embryos in their brood pouches, which occupy 41.5%, Lengths of their body are between 0.30 to 0.49mm. There...

Three hemdvoel 300 individuals of Oxyurella tenuicaudis of both sexes and 3 ephjppia were selected from the plankton sample collected from a small pond in Yongsheng, Yunnan province on 26 Aug. 1982. Among them 265 are females occupied 88.3% of the total number of individuals. The body lengths are between 0.24 to 0.50 mm, but most of them are from 0.36 to 0.45mm. There are 110 females with eggs or embryos in their brood pouches, which occupy 41.5%, Lengths of their body are between 0.30 to 0.49mm. There are 64 females with only one egg occupying 58.2%, most of them are 0.36 to 0.39 mm long. 46 individuals each with two eggs are covering 41.8%, most of them are 0.41 to 0.45 mm long. There are 35 males among those 300 Oxyurella tenuicaudis, occupying 11.7%, their length are between 0.32 to 0.35 mm.Biological characters such as ratio of juvenile and adult, body length and brood size and sex ratio etc in the population of Oxyurella tenuicaudis are discussed, We infered that the population dynamics is of monocycle and begimto decline. The peak of population density has been passed whereas the males were continously increasing and the population would disappear in winter.The post-abdomen of 200 females were observed carefully and their variation were described.

瘦尾细额溞是一种出现数量极其稀少的枝角类。关于它的生物学特征尚未见诸文献。本文测量了一次采自云南永胜一池塘的本种300个两性个体的体长和怀卵量,就其幼体与成体的数量、体长与怀卵量、雄性以及性比等问题探讨了种群的生物学状况。 详细观察比较了这个种的重要分类特征——雌体后腹部,并描述了变异范围。对卵鞍和雄体也作了描述。

154 individuals of Alona affinis of both sexes and six ephippia were selected from the plankt on samples collected from the Kaitu River, Guizhou Province, Among them 143 are females occupied 92.86% of the total number of the individuals. The body lengthes are between 0.44 to 0.86mm, but most of them are from 0.50 to 0.78mm. There are 41 females with eggs or embryos in their brood pouches, which occupy 28.68%. Lengthes of their body are between 0.56 to 0.86mm. There are 11 females with only one egg, occupying...

154 individuals of Alona affinis of both sexes and six ephippia were selected from the plankt on samples collected from the Kaitu River, Guizhou Province, Among them 143 are females occupied 92.86% of the total number of the individuals. The body lengthes are between 0.44 to 0.86mm, but most of them are from 0.50 to 0.78mm. There are 41 females with eggs or embryos in their brood pouches, which occupy 28.68%. Lengthes of their body are between 0.56 to 0.86mm. There are 11 females with only one egg, occupying 26.83%,and 30 individuals each with two eggs are covering 73.17%. There are 11 mades among those 154 Alona affinis, occupying 7.14%. Their lengthes are between 0.53 to 0.60mm。 Biological characters in this populations of Alona affinis are discussed. According to the morphology, it is infered that this is the subspecies nominotypica.

本文测量计数了采自贵州省江口县凯土河边的154个近亲尖额溞的体长和怀卵量,并探讨了这个种群的一些生物学性状。根据形态特征,确定本种为指名模式亚种。

In the present paper, a brief account is given of the investigation of the environmental sex determination and sex ratio in Crustacea with special reference to Cladocera. The following are the main results of the investigation : (1) The sex of Cladocera such as Daphnia is determined about 4 h before the deposition of eggs in the brood pouch. The time of sensitive period of sex determination varies, however, with different species and also with environmental factors (chiefly temperature). (2) The sex of...

In the present paper, a brief account is given of the investigation of the environmental sex determination and sex ratio in Crustacea with special reference to Cladocera. The following are the main results of the investigation : (1) The sex of Cladocera such as Daphnia is determined about 4 h before the deposition of eggs in the brood pouch. The time of sensitive period of sex determination varies, however, with different species and also with environmental factors (chiefly temperature). (2) The sex of Amphipoda such as Gammarus is determined mainly by the male hormone secreted by the androgenic gland lying near the distal end of vas deferens. (.3) The sex determination of Crustacea is affected, without exception, by both external and internal faetros. Of the former, both low temperature and poor food are responsible for the male production, As to the latter, both metabolism and hormone play an important role in the male production. (4) A brief review is given of Berg's "depression hypothesis" which shows that the crowding of parthnogenetic females of Cladocera (Daphnia and Moina) will lead to the production of sexual individuals by reducing metabolic rate and accurnmulation of metabolic wastes. (5) A considerable variation exists in the sex ratio of various groups of Crustacea, being caused by environmental factors, specially temperature ; but certain internal factors such as metabolism, age, longevity etc. can also affect sex ratio. Finally, the writer expresses his opinion that a greater attention should be paid to the evolutionary significance of sex determination and sex ratio and also to the aquarculture with the aim of producing more female crabs for human consumption.

本文评述了甲壳动物的性决定和性比与环境关系问题的研究结果,论述了枝角类、端足类和其他甲壳动物的性决定的内、外因子,评价了Berg的“压抑”假说,并对今后该方面的研究重点,提出了意见和建议。

 
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