Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 (Protozoa : Rhizopoda)
文献类型：期刊论文
| 作者 | Yang, J; Shen, YF |
| 刊名 | ACTA PROTOZOOLOGICA
 |
| 出版日期 | 2005-05-01 |
| 卷号 | 44期号:2页码:103-111 |
| 关键词 | biometry Difflugia biwae distribution morphology Testacea |
| ISSN号 | 0065-1583 |
| 通讯作者 | Shen, YF, Chinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China |
| 中文摘要 | The freshwater testate amoeba Difflugia biwae Kawamura, 1918, isolated from Mulan Lake, Hubei Province, China is investigated using light microscopy and scanning electron microscopy. The morphology, biometry and distribution of this little known species are supplied. After careful comparison with three other similar species, including D. delicatula Gauthier-Livre et Thomas, D. elegans Penard and D. oblonga caudata Stepanek, we believe that the characteristics of smooth fusiform shell, conspicuous great collar flare (always larger than body-width) around the aperture, constriction behind the aperture and a somewhat curved aboral horn set D. biwae apart from all other Difflugia species. This species shows a great diversity in total length, collar height and aboral horn length which have high variability (CV between 11.76 and 24.52). However, body width, collar diameter, neck width, body length and aperture diameter are fairly constant with low variability (CV between 5.34 and 8.79) which shows a remarkable uniformity of D. biwae. Also, the size frequency distributions of both body width and body length yield bell-shaped (normally distributed) curves and indicate that D. biwae is a size-monomorphic species, characterized by a main-size class and a small size range. D. biwae is probably endemic to East Asia (China and Japan) because it has such a large size (165-306 mu m) that it would have been easily found in Europe and North America, if it were there. Consequently, D. biwae must have a restricted geographical distribution, disproving the old hypothesis that microscopic organisms are cosmopolitan. |
| 英文摘要 | The freshwater testate amoeba Difflugia biwae Kawamura, 1918, isolated from Mulan Lake, Hubei Province, China is investigated using light microscopy and scanning electron microscopy. The morphology, biometry and distribution of this little known species are supplied. After careful comparison with three other similar species, including D. delicatula Gauthier-Livre et Thomas, D. elegans Penard and D. oblonga caudata Stepanek, we believe that the characteristics of smooth fusiform shell, conspicuous great collar flare (always larger than body-width) around the aperture, constriction behind the aperture and a somewhat curved aboral horn set D. biwae apart from all other Difflugia species. This species shows a great diversity in total length, collar height and aboral horn length which have high variability (CV between 11.76 and 24.52). However, body width, collar diameter, neck width, body length and aperture diameter are fairly constant with low variability (CV between 5.34 and 8.79) which shows a remarkable uniformity of D. biwae. Also, the size frequency distributions of both body width and body length yield bell-shaped (normally distributed) curves and indicate that D. biwae is a size-monomorphic species, characterized by a main-size class and a small size range. D. biwae is probably endemic to East Asia (China and Japan) because it has such a large size (165-306 mu m) that it would have been easily found in Europe and North America, if it were there. Consequently, D. biwae must have a restricted geographical distribution, disproving the old hypothesis that microscopic organisms are cosmopolitan. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 学科主题 | Microbiology |
| 类目[WOS] | Microbiology |
| 研究领域[WOS] | Microbiology |
| 关键词[WOS] | LAKE BIWA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000228739400002 |
| 公开日期 | 2010-10-13 |
| 源URL | [http://ir.ihb.ac.cn/handle/152342/9282]  |
| 专题 | 水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, J,Shen, YF. Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 (Protozoa : Rhizopoda)[J]. ACTA PROTOZOOLOGICA,2005,44(2):103-111. |
| APA | Yang, J,&Shen, YF.(2005).Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 (Protozoa : Rhizopoda).ACTA PROTOZOOLOGICA,44(2),103-111. |
| MLA | Yang, J,et al."Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 (Protozoa : Rhizopoda)".ACTA PROTOZOOLOGICA 44.2(2005):103-111. |
入库方式： OAI收割
来源：水生生物研究所
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