| 闻海波,许洪洪,曹哲明,顾若波,徐钢春,华丹,徐跑.2011.孕育对褶纹冠蚌滤食率的影响及鳃微结构变化.动物学杂志,46(4):84-91. |
| 孕育对褶纹冠蚌滤食率的影响及鳃微结构变化 |
| Effects of Propagation on Filtration Rate and Variation of Gill Microstructure in Wrinkle Comb Pearl Mussel Cristaria plicata |
| 投稿时间：2010-12-10 修订日期：2011-04-25 |
| DOI： |
| 中文关键词: 褶纹冠蚌 孕育 滤食率 育儿囊 鳃结构 |
| 英文关键词:Cristaria plicata Gravidity Filtration rate Marsupia Gill microstructure |
| 基金项目:公益性行业(农业)科研专项(No.200903028),2007年财政部修购淡水贝类实验室项目,国家基础性工作重点专项(No. 2002DEB10052) |
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| 中文摘要: |
| 对比了褶纹冠蚌(Cristaria plicata)孕育蚌、未孕雌蚌和雄蚌的滤食率,并运用组织学、扫描电镜和透射电镜对实验蚌的鳃结构进行比较观察,以此探讨鳃结构变化对滤食功能的影响。滤食实验结果表明:孕育事件显著降低了雌蚌的滤食率,而未孕雌蚌与雄蚌的滤食率无显著差异。孕育雌蚌内外鳃均由两鳃小瓣愈合而成,每一鳃小瓣由成排的鳃丝组成,在中介区鳃丝之间通过丝间隔连接,在内部侧区则通过瓣间隔相连。雌蚌内鳃的鳃间隔为外鳃的2~3倍,而雄蚌的内外鳃无差异。孕育雌蚌外鳃在初级水管、瓣间隔等出现明显的变化,并出现了二级水管结构,而内鳃未发现显著变化。扫描电镜显示:在褶纹冠蚌鳃丝表面存在3种类型的纤毛(前纤毛、前侧纤毛和侧纤毛),其形态结构和分布各具特点,长径58~85 μm椭圆形的鳃小孔成排相间分布于鳃丝之间,而3组实验蚌的内外鳃丝之间无明显差异。透射电镜观察发现:孕育雌蚌鳃丝表皮细胞表面形成突起,显著增加了表面微绒毛的数量,可能有利于雌蚌在孕育期间由于初级水管转化成育儿囊后对呼吸、滤食等功能的补偿,与其他蚌科物种报道类似。综合实验表明, 孕育雌蚌外鳃结构的变化,尤其是初级水管的结构改变和二级水管、鳃丝表面褶皱的出现可能是影响孕育雌蚌滤食功能的主要原因。 |
| 英文摘要: |
| The filtration rate of gravid females is signifiantly less than that of non-gravid females or males, whereas filtration rates of non-gravid females and males are similar in the wrinkle comb pearl mussel Cristaria plicata . Microstructure and ultrastructure of the inner and outer demibranchs of C.plicata , observed by histology, SEM, and TEM, show that a number of longitudinally arranged branchial filaments on each demibranch are connected by interfilamentary junctions in the intermediary zone, and by interlamellar septa in the lateral zone. The interlamellar septum of the inner demibranch of the female was about 2 to 3 times larger than those of the outer demibranch. The outer demibranches of gravid mussels are observably broader than those in non-gravid female and male mussels. There are no significant differences between sexes or gravidity in the distribution of the frontal, laterofrontal, and lateral cilia on the surface of the branchial filaments. Rows of interfilament canals, 58-85 μm in major axis, are located between adjacent filaments. The ultrastructure of the protuberances and microvilli of the gill epidermal cells, observed through TEM, is consistent with previous observations on other Unionidae species. Ultimately, differences in the structure of the outer demibranch of gravid mussels, especially modification of primary water tube and appearance of secondary water tube, increasing folds on the surface of filament epithelium appear to affect their filtration rate. |
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