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通过对广州市花地湾花鸟鱼虫市场两栖类宠物贸易进行为期3年27次调查,共记录贸易两栖类类44种,隶属2目16科35属。有尾目(Caudata)2科7属8种,钝口螈科(Ambystomatidae)1属2种,蝾螈科(Salamandridae)6属6种;无尾目(Anura)14科28属36种,铃蟾科(Bombinatoridae)1属1种,蟾蜍科(Bufonidae)3属3种,角花蟾科(Ceratophryidae)2属5种,其中1种为杂交种,丛蛙科(Dendrobatidae)2属4种,雨蛙科(Hylidae)3属5种,非洲树蛙科(Hyperoliidae)1属1种,角蟾科(Megophryidae)2属2种,姬蛙科(Microhylidae)5属6种,澳雨蛙科(Pelodryadidae)1属1种,叶泡蛙科(Phyllomedusidae)1属1种,负子蟾科(Pipidae)1属1种,箱头蛙科(Pyxicephalidae)1属1种,蛙科(Ranidae)2属2种,树蛙科(Rhacophoridae)3属3种。分布于国内的两栖类16种,外来物种共28种。受保护种类26种,所占比例达59.09%。讨论了两栖类宠物贸易对国内外珍稀濒危种类保护的压力、对生态系统的压力和对两爬类研究的影响。 相似文献
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我国有尾两栖动物的分类 总被引:4,自引:1,他引:3
有尾两栖动物又叫蝾螈,隶属两栖纲有尾目,是现生脊椎动物中一个较小类群。全世界共9科59属约310种及亚种,我国现已知3科12属32种。以前,这类动物不大为人们所了解,对其分类研究也不太多。近年来,由于国内外对有尾目的分类研究日渐增多,有必要对其分类作一介绍。有尾目的分类特征一、外部形态体形较细长,分为头、颈、躯干、尾及四肢几部分。其外形似爬行纲的蜥蜴目动物。幼体一般生活于水中,有外鳃,经变态达成体阶段。用于分类鉴定上的特征现分述如下。1.体形大鲵属Andrias的头与躯干明显宽扁,体侧有粗大纵肤褶,体长可达1米以上(一般也在250… 相似文献
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江西地区已有两栖动物计2目8科38种(Zhu,1994),其中有尾类已有记录为3种:大鲵(Andriasdavidianus)、东方蝾螈(Cynops orientalis)和肥螈(Paehytriton brevipes)。最近笔者在江西永新县深远山自然保护区陆生脊椎动物调查中,发现了蝾螈科(Salamandridae)瘰螈属(Paramesotrlton)一种有尾类动物,为江西省分布的新记录。现报道如下,作为该物种地理分布的资料参考。1采集时间和地点中国瘰螈[Paramesotriton chinensis(Gary,1895)]标本由宋玉赞采集于2006年5月17日江西省永新县深远山自然保护区船坪附近小溪,海拔352—576m,地理坐标为26°45.1… 相似文献
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钝叶苔属(Cladopodiella)隶属于苔类植物的大萼苔科(Cephaloziaceae),本属有2种:C.fluitans(Nees)Spr.和C.francisci(Hook.)Buch.,广泛分布于欧洲和北美洲,其中前者在日本有记录。本属我国首次记录,仅发现1种:C.francisci(Hook.)Buch.,分布西藏。钝叶苔属CladopodiellaBuch.,Mem.Soc.F.Fl.Fennica5:87,1927.Type:Cladopodiellafluitans(Nees)Spr.植物体纤细,淡绿色。茎具腹面分枝,横切… 相似文献
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浙江省两栖纲动物调查报告 总被引:2,自引:0,他引:2
一、引言 关于浙江省两栖纲动物的调查工作,先后有Boring和张作干(1933)、张孟闻(1938)、Pope(1931、1949)、毛节荣(1959)等的报导。在1961年刘承钊、胡淑琴的《中国无尾两栖类》中,综述了浙江省过去的工作。综合上述资料,浙江省共计有两栖纲动物28种,分隶于9科14属,其中有尾目3科6属6种;无尾目6科8属22种。 作者等自1953年开始,对浙江省两栖纲动物标本进行收集和采集,并于1962年和1964年4-7月,在 相似文献
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我国有尾目三科代表种生物学和胚胎发育的比较 总被引:2,自引:0,他引:2
我国有尾目三科代表种生物学和胚胎发育的比较刘鉴毅(中国水产科学研究院长江水产研究所湖北沙市434000)东方蝾螈(Cynopsorientails)、中国小鲵(Hynobiuschinensis)和中国大鲵(Andriasda。idianus)在分类... 相似文献
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Although the importance of the endosperm as a food store inmany angiosperm seeds is well known, its significance duringearly embryogenesis has been neglected. In many interspecifichybrids, and in some other situations, embryos do not developfully and abort. It has often been stated that this is causedby the endosperm failing to conduct sufficient nutrients tothe embryo, but seldom has it been suggested that the endospermactively controls most of the early stages of morphogenesisof the embryo. Information gleaned from a broad survey of theliterature, combined with additional evidence presented here,obtained fromSolanum incanumand interspecific hybrids, indicatethat the endosperm is dynamic and very active in regulatingearly embryo development. This requires highly integrated geneticcontrol of rapidly changing metabolism in the endosperm. Ininterspecific hybrids, lack of coordination may cause unbalancedproduction of growth regulating substances by the endospermand hence abortion of the embryo, or even unregulated productionof nucleases and proteases resulting firstly in autolysis ofthe endosperm and then digestion of the embryo. The endospermmay thus serve to detect inappropriate hybridization of speciesor ploidy levels and so prevent waste of resources by producingseeds that would result in sterile hybrids or unthrifty subsequentgenerations. This discriminatory function of the endosperm hasdiminished during evolution and domestication of the crop plantSolanummelongenaL.Copyright 1998 Annals of Botany Company Solanum, embryo morphogenesis, endosperm, hybrid, seed development. 相似文献
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环腺苷酸应答元件结合蛋白与学习记忆 总被引:2,自引:0,他引:2
环腺苷酸(cAMP)应答元件结合蛋白(cAMP response element binding protein,CREB)是一种核转录因子,可与cAMP反应元件结合,调节基因转录,具有调节精子生成,昼夜节律,学习记忆等功能.近年来关于其在学习记忆中的作用成为医学研究热点.CREB是神经元内多条信息传递途径的汇聚点,参与长时记忆形成和突触可塑性.长时记忆(long-term memory)形成需依赖CREB介导的基因转录,干扰或抑制CREB活性可破坏长时记忆.长时程增强(long-term potentiation,LTP)是研究学习记忆的理想模型,在LTP诱导和维持过程中均可观察到CREB活性持续升高.但增龄过程中,海马CREB活性下降,影响学习记忆功能,与许多神经退行性疾病发生有关. 相似文献
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Höpfl G Ogunshola O Gassmann M 《American journal of physiology. Regulatory, integrative and comparative physiology》2004,286(4):R608-R623
For most organisms oxygen is essential fo life. When oxygen levels drop below those required to maintain the minimum physiological oxygen requirement of an organism or tissue it is termed hypoxia. To counter act possible deleterious effects of such a state, an immediate molecular response is initiated causing adaptation responses aimed at cell survival. This response is mediated by the hypoxia-inducible factor-1 (HIF-1), which is a heterodimer consisting of an alpha- and a beta-subunit. HIF-1 alpha protein is stabilized under hypoxic conditions and therefore confers selectivity to this response. Hypoxia is characteristic of tumors, mainly because of impaired blood supply resulting from abnormal growth. Over the past few years enormous progress has been made in the attempt to understand how the activation of the physiological response to hypoxia influences neoplastic growth. In this review some aspects of HIF-1 pathway activation in tumors and the consequences for pathophysiology and treatment of neoplasia are discussed. 相似文献
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Michele Rivkin-Flsh 《Medical anthropology quarterly》2000,14(1):119-120
Pragmatic Women and Body Politics. Margaret Lock and Patricia A. Kaufert. eds. Cambridge, UK: Cambridge University Press, 1998. xii +364 pp.
Maternities and Modernities: Colonial and Postcolonial Experiences in Asia and the Pacific. Kalpana Ram and Margaret Jolly. eds. Cambridge, UK: Cambridge University Press, 1998. xiv. 305 pp. 相似文献
Maternities and Modernities: Colonial and Postcolonial Experiences in Asia and the Pacific. Kalpana Ram and Margaret Jolly. eds. Cambridge, UK: Cambridge University Press, 1998. xiv. 305 pp. 相似文献
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