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长江华溪蟹精子发生过程中线粒体的超微结构研究 总被引:14,自引:0,他引:14
长江华溪蟹精子发生过程中线粒体的数目,形态及大小在不同时期的细胞中很不一致,随机能状况而起变化。精原细胞期,线粒体数量较多,主要集中在细胞一侧的胞质中,贴近核膜,形态正常,脊发达。初级精母细胞期,线粒体数量有所减少,集中现象消失,嵴开始退化。 相似文献
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华溪蟹属Sinopotamon是中国淡水蟹类的特有属。在构建种群数据库的基础上,对华溪蟹属的分布格局进行了深入的研究。结果显示:迄今,华溪蟹属已报告75种和9亚种,占中国淡水蟹总数的29.68%(84/283),系中国淡水蟹36个属中所含种及亚种最多的一个类群,广泛分布于赣、鲁、苏、皖、浙、闽、湘、鄂、粤、桂、川、黔、豫、晋、陕、陇、冀计17个省区。华溪蟹属的分布格局与中国自然地理环境区域分异密切相关,自然地理的阻限等因素是导致华溪蟹属在中国高度分化的主要原因,表现出该属下物种对现代自然条件的适应及其遗传与分化至现阶段的结果。依照中国淡水蟹类地理区划的划分,华溪蟹属分属于西南区、华中区、华南区、华北区及其各亚区的东部季风区内,以东洋界物种成分为绝对优势,其地理分布约以24°N为其南限,37°N为北限,经度则为103°E以东直至东南沿海地区。在垂直分布上,该属物种多分布在海拔200~1000m。又以长江中下游一带物种最为丰富,而黄河与淮河流域则相对贫乏。秦岭及其淮河一线成为华溪蟹属东洋界和古北界物种的明显分野地域,但二界之间存在广泛过渡与渗透。据此,华溪蟹属的地理分布,均受制于中国第2级阶梯和第3级阶梯内的秦岭、雪峰山、巫山、太行山、南岭、武夷山等主要山脉及其低岗丘陵与平原地域。 相似文献
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对中国海鼓虾科角鼓虾属系统分类进行了研究.角鼓虾全世界共记录34种,其中中国海记录了9种.本文中记录中国海分布的角鼓虾属Athanas 8种,其中对中国海2新纪录种A.polymorphus Kemp和A.squillophilus Hayashi,进行了描记,并提供了中国角鼓虾种检索表.在中国的材料中:A.japonicus、A.ohsimai、A.polymorphus及A.squillophilus 4种的螯足表现了多态性,A.ohsimai和A.squillophilus的螯足多态性也是首次发现和记载.所有研究测量标本均保存在中国科学院海洋研究所. 相似文献
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华溪蟹属Sinopotamon是中国淡水蟹类的特有属.在构建种群数据库的基础上,对华溪蟹属的分布格局进行了深入的研究.结果显示:迄今,华溪蟹属已报告75种和9亚种,占中国淡水蟹总数的29.68% (84/283),系中国淡水蟹36个属中所含种及亚种最多的一个类群,广泛分布于赣、鲁、苏、皖、浙、闽、湘、鄂、粤、桂、川、黔、豫、晋、陕、陇、冀计17个省区.华溪蟹属的分布格局与中国自然地理环境区域分异密切相关,自然地理的阻限等因素是导致华溪蟹属在中国高度分化的主要原因,表现出该属下物种对现代自然条件的适应及其遗传与分化至现阶段的结果.依照中国淡水蟹类地理区划的划分,华溪蟹属分属于西南区、华中区、华南区、华北区及其各亚区的东部季风区内,以东洋界物种成分为绝对优势,其地理分布约以24°N为其南限,37°N为北限,经度则为103°E以东直至东南沿海地区.在垂直分布上,该属物种多分布在海拔200~1 000 m.又以长江中下游一带物种最为丰富,而黄河与淮河流域则相对贫乏.秦岭及其淮河一线成为华溪蟹属东洋界和古北界物种的明显分野地域,但二界之间存在广泛过渡与渗透.据此,华溪蟹属的地理分布,均受制于中国第2级阶梯和第3级阶梯内的秦岭、雪峰山、巫山、太行山、南岭、武夷山等主要山脉及其低岗丘陵与平原地域. 相似文献
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SEX DETERMINATION IN CRUSTACEA 总被引:5,自引:0,他引:5
J. J. LEGRAND E. LEGRAND-HAMELIN P. JUCHAULT 《Biological reviews of the Cambridge Philosophical Society》1987,62(4):439-470
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SEX PHEROMONES IN CRUSTACEA 总被引:3,自引:0,他引:3
PHILIP J. DUNHAM 《Biological reviews of the Cambridge Philosophical Society》1978,53(4):555-583
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海南水域蟹类区系十分丰富,仅玉蟹科就有54种,本文报道了其中发现6新种。 相似文献
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报道中国南海阿蛄虾科一新种,即董氏丽阿蛄虾Calaxius tungi sp.mov.,对其形态特征作了描述,并与近似种进行了比较。 相似文献
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NITROGEN EXCRETION IN MARINE AND FRESH-WATER CRUSTACEA 总被引:6,自引:0,他引:6
1. The major characteristic of aquatic Crustacea is ammonotelism as shown by the relative importance of various nitrogenous end-products of their nitrogen metabolism.
2. In contrast to urico- and ureo-genesis pathways, ammoniogenesis pathways have received recent attention; some specific enzymes such as glutamate dehydrogenase, AMP-deaminase and glutaminase are now admitted to play a possible key role in ammoniogenesis of various crustacean species.
3. Processes involved in ammonia output through the gill epithelium (diffusion and/or ionic exchanges) are discussed though few data related to Crustacea are as yet available compared to those obtained in ammonotelic fishes.
4. The effects of some environmental factors as well as the physiological state of animals on nitrogen excretion of Crustacea are envisaged. The effects of temperature, salinity and NH4 concentration in the external medium are discussed first, followed by the changes in nitrogen excretion associated with the moult cycle, the nutritional state of animals and possible neuroendocrine control. It is demonstrated that the response of the excretion rate to these factors presents various patterns according to the species, its osmoregulatory abilities and its body reserves. Changes can also occur in the requisite metabolic pathways, thus increasing the difficulty of generalization.
5. In spite of the great diversity encountered within Crustacea an attempt to bring out general trends of their nitrogen excretion is proposed.
6. The present review is focused on metabolic and physiological aspects of crustacean nitrogen excretion but the significance of nitrogen release in nutrient regeneration in marine and fresh-water ecosystems is foreseen. 相似文献
2. In contrast to urico- and ureo-genesis pathways, ammoniogenesis pathways have received recent attention; some specific enzymes such as glutamate dehydrogenase, AMP-deaminase and glutaminase are now admitted to play a possible key role in ammoniogenesis of various crustacean species.
3. Processes involved in ammonia output through the gill epithelium (diffusion and/or ionic exchanges) are discussed though few data related to Crustacea are as yet available compared to those obtained in ammonotelic fishes.
4. The effects of some environmental factors as well as the physiological state of animals on nitrogen excretion of Crustacea are envisaged. The effects of temperature, salinity and NH
5. In spite of the great diversity encountered within Crustacea an attempt to bring out general trends of their nitrogen excretion is proposed.
6. The present review is focused on metabolic and physiological aspects of crustacean nitrogen excretion but the significance of nitrogen release in nutrient regeneration in marine and fresh-water ecosystems is foreseen. 相似文献
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报道了黄渤海分布的褐虾科共4属6种,并提供了详细的检索表和各种的鉴别特征、地理分布、外部形态图,并讨论了各种目前存在的分类学问题。 相似文献
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ENDOCRINE CONTROL OF REPRODUCTION IN DECAPOD CRUSTACEA 总被引:4,自引:0,他引:4
K. G. ADIYODI RITA G. ADIYODI 《Biological reviews of the Cambridge Philosophical Society》1970,45(2):121-164
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近年来,随着水产经济动物遗传育种研究的迅速发展,对染色体制备技术的要求越来越高。十足类甲壳动物染色体的研究开展较早,但进展却相当缓慢,自一百多年前,Carnoy首次报道了褐虾和滨蟹的染色体,迄今为止已研究过的种类仅约70多种。其主要原因在于其细胞有丝分裂中期染色体 相似文献