{"created":"2023-07-25T10:59:10.727842+00:00","id":731,"links":{},"metadata":{"_buckets":{"deposit":"7490ff1f-4489-49ba-bcf3-a91aa9f6cd13"},"_deposit":{"created_by":4,"id":"731","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"731"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00000731","sets":["1:337:338"]},"author_link":["481","480"],"item_1_alternative_title_5":{"attribute_name":"論文名よみ","attribute_value_mlt":[{"subitem_alternative_title":"Variations on Some Pennate Diatoms from Antarctica"}]},"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1963-05","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"\"20,5\"","bibliographicPageStart":"1","bibliographicVolumeNumber":"18","bibliographic_titles":[{"bibliographic_title":"JARE scientific reports. Ser. E, Biology"}]}]},"item_1_creator_7":{"attribute_name":"著者名よみ","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"コバヤシ, ツヤコ"}],"nameIdentifiers":[{}]}]},"item_1_creator_8":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"KO-BAYASHI, Tsuyako","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_1_description_1":{"attribute_name":"ページ属性","attribute_value_mlt":[{"subitem_description":"P(論文)","subitem_description_type":"Other"}]},"item_1_description_12":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"The results of the investigation on the variation of the 10 taxon of the diatoms are reported in the sections 2-11 in detail. This is the summary. Form of shells is classified into 3 taxon such as those which vary strongly, those which do not vary so strongly, and those which scarcely vary. The taxon which strongly varied were Achnanthes brevipes var. arctica, Achnanthes lanceolata var. lanceolata f. dubia, Cymbella cistula, Hantzschia amphioxys var. recta, Navicula muticopsis var. muticopsis f. capitata, N. m. var. m. f. murrayi, etc. The taxon which were not so varied were Achnanthes brevipes var. intermedia, Pinnularia subcapitata var. subcapitata, etc. The taxon scarcely varied was Navicula cryptocephala and N. molesta. However, this Navicula cryptocephala was varied strongly at the central striae which were long and short alternately or not alternately, although not so strong variation was observed in the outer shape of shells. Thus, variation is sometimes very strong on a certain characteristic, but scarcely found on the other characteristics. And sometimes variation is not found on all the characteristics at a time. For example, Cymbella cistula which was collected from Oze situated in the central part of Japan was not so varied in shell shape, but the same species that was collected from South Georgia of the Antarctic strongly varied in shell shape. It seems from this fact that according to the difference of the growing circumstances or strains, even the same species strongly vary in some cases, and may not vary so strongly in other. Therefore, the writer thinks that it is not enough to examine the materials from only one place in order to study variation. However, in order to assertain the characteristics for standards of classification, like the purpose of this work or to re-arrange the taxon which are classified into many species on the basis of the variable materials at a place, the writer has found that the study of the materials collected from a particular place is fairly effective. The outer shape of shells, especially that of the ends, is often expressed by \"not so extended\", or \"extended in rostral shape\", or \"extended in capitate shape\" and so on. But actually, there are many intermediate individuals which are very difficult to be distinguished. There are many individuals consisting of shells of capitate ends or individuals of larger size which are remarkably extended at the ends, but in the same taxa, smaller individuals are generally slightly extended at ends (cf. Achnanthes lanceolata var. lanceolata f. dubia, Navicula muticcopsis var. muticopsis f. capitata, N. m. var. m. f. murrayi). On the other hand, constriction of extremely large size of individuals becomes slighter (cf. Navicula muticopsis var. muticopsis f. murrayi). The smaller the individuals become, the slighter becomes the constriction of shells, because in most cases the shells get shorter but they do not become narrower. The outer shapes of these smaller individuals of short length are simple too. It is generally considered that individuals are connected with many intermediate ones, except when margins of shells are remarkably parallel, penetrated, extended, constricted or expanded (cf. Pinnularia subcapitata var. subcapitata). When shells are extremely large or small, and when the ratio of shell length and width is variable, the individuals are often classified into different varieties (cf. Cymbella cistula, etc.). However, as these individuals are almost always connected, it is proper to classify them into species, and not into varieties, even though the size is seen to be far larger than the existing records. But when the size is different and other characteristics, such as distance of striae, are also variable, the above principle should not be applied. It is necessary to take note that the shape of the ends or the margins varied with the size of the shells as mentioned above. The arrangement of striae of the central part of shells, such as long and short alternately or not alternately, is sometimes considered as a characteristic of varieties, and sometimes as that of species. Much importance is given to this characteristic, as some species (cf. Navicula cryptocephala) possess variation in this characteristic. Distance between the striae is almost always uniform, but sometimes varies remarkably. Therefore, if this characteristic is used as a basis of classification of taxon (cf. Pinnularia subcapitata var. subcapitata), much care should be taken. Mention of the direction of striae is generally made except of the central part, but sometimes it is not made at all (Navicula moresta). In some cases, individuals are classified by the shape of width of axial areas, but this characteristic also varies remarkably (cf. Pinnularia subcapitata var. subcapitata, etc.). From the above examination, the writer found that the characteristics used as standards of taxonomy vary strongly in some taxon. Therefore, it is necessary for description of new taxa to examine materials as much as possible to ascertain the variation range of the taxa. During the examination, the writer found many different taxa such as that which is re-arranged to be a different species, that which was a variety of different species (Achnanthes brevipes var. arctica, Navicula muticopsis var. muticopsis f. murrayi) that which was the taxon which is re-arranged to be a species from a variety (Achnanthes lanceolata var. lanceolata f. dubia, etc.) and also many synonyms. The writer arranged the confused species which were called by many different names (Navicula muticopsis var. muticopsis f. capitata, N. m. var. m. f. murrayi), and corrected the incomplete descriptions made by many investigators up till now (Navicula muticopsis var. muticopsis f. capitata, N. m. var. m. f. murrayi, Tropidoneis laevissima), and discovered many larger and smaller individuals which were not recorded in the literatures.","subitem_description_type":"Other"}]},"item_1_source_id_13":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AA00733539","subitem_source_identifier_type":"NCID"}]},"item_1_text_10":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Biological Institute, Yokohama Municipal University"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"1963-05-01"}],"displaytype":"detail","filename":"KJ00002377405.pdf","filesize":[{"value":"4.8 MB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00002377405","url":"https://nipr.repo.nii.ac.jp/record/731/files/KJ00002377405.pdf"},"version_id":"19392830-3a4c-42d5-81de-5087fe8cd476"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Variations on Some Pennate Diatoms from Antarctica","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Variations on Some Pennate Diatoms from Antarctica","subitem_title_language":"en"}]},"item_type_id":"1","owner":"4","path":["338"],"pubdate":{"attribute_name":"公開日","attribute_value":"1963-05-01"},"publish_date":"1963-05-01","publish_status":"0","recid":"731","relation_version_is_last":true,"title":["Variations on Some Pennate Diatoms from Antarctica"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T15:01:43.143750+00:00"}