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Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 (Protozoa : Rhizopoda)
Yang, J; Shen, YF; Shen, YF, Chinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China
2005-05-01
Source PublicationACTA PROTOZOOLOGICA
ISSN0065-1583
Volume44Issue:2Pages:103-111
AbstractThe 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.; 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.
SubtypeArticle
KeywordBiometry Difflugia Biwae Distribution Morphology Testacea
Subject AreaMicrobiology
DepartmentChinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China; Chinese Acad Sci, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaMicrobiology
WOS SubjectMicrobiology
WOS KeywordLAKE BIWA
WOS IDWOS:000228739400002
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9282
Collection中科院水生所知识产出(2009年前)
Corresponding AuthorShen, YF, Chinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China
Affiliation1.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
Recommended Citation
GB/T 7714
Yang, J,Shen, YF,Shen, YF, Chinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China. Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 (Protozoa : Rhizopoda)[J]. ACTA PROTOZOOLOGICA,2005,44(2):103-111.
APA Yang, J,Shen, YF,&Shen, YF, Chinese Acad Sci, Inst Hydrobiol, Lab Taxon & Ecol Protozoa, Wuhan 430072, Peoples R China.(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.
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