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Two-membered cultures of 3 phytoplankters isolated from Onondaga Lake, grown in defined media under laboratory conditions, were analyzed by electronic particle counts and statistical methods to determine antagonistic, neutral, or stimulatory relationships. Over the range studied (exponential phase of growth, nutrients not limiting), growth of Staurastrum paradoxum is markedly reduced in the presence of Chlamydomonas sp. Growth of Chlamydomonas is not affected by presence of Staurastrum. The initial concentration of Staurastrum has an effect on its subsequent growth. The initial concentration of Chlamydomonas does not have an effect on its subsequent growth nor that of Staurastrum. These effects are not mediated by a filterable factor (unless highly labile) or by competition for a nutrient. They resemble, and perhaps describe, fluctuations of these species in the lake. 相似文献
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泸沽湖米虾属一新种:十足目:匙指虾科 总被引:3,自引:0,他引:3
本文描述的尖肢米虾Caridina acutipoda sp.nov.生活于云南与四川交界的泸沽湖中。它的雄性第三、四对步足掌节末半膨突、多刺,与高原湖泊种类葛氏米虾 Caridina gregoriana Kemp相似。但其雄性第一腹肢末端尖,第二腹肢的雄附肢不呈铲形,易与后者相区别。 相似文献
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《昆虫学报》1980,(4)
The present paper deals with ten new species and one new genus of Delphacidae fromvarious parts of China. These type specimens are kept in the authors institutions re-spectively. 1. Stenocranus hongtiaus Kuoh sp. nov. (fig. 1) This species resembles S. matsumurai Metcalf, but may be separated by the body dis-tinctly smaller, the pronotum and mesonotum with two orge-red stripes, the form ofthe processes of the anal segment, and of the inner margin of the genital styles. 相似文献
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中国鯻科鱼类一新种——清澜叉牙鯻 总被引:1,自引:0,他引:1
本文记述鲈形目鯻科一新种——清澜叉牙鯻Helotes qinglanensis sp.nov.,1955和1956年采自海南岛清澜港。本新种模式标本保存于中国科学院海洋研究所。 相似文献
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《动物分类学报》1964,(2)
The present paper deals with six species of four genera of Chinese Hemiptera-Heteroptera, including one new genus, five new species and one new record, Scotomedesalienus (Dist.). They represent four families: Urostylidae (subfam. Saileriolinae), Iso-metopidae, Velocipedidae and Leptopodidae. Velocipedidae, Leptopodidae and sub- 相似文献
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A new species of Dictyostelium, isolated from a decaying ear of corn in Hawaii, is described. Because of the numerous irregularities in its developmental morphology and general appearance, it is being named D. irregularis. Aggregation is by amoebal streaming, and the aggregation mass commonly segments into several pseudoplasmodia, each of which produces a sorocarp in situ or after migration. During migration stalk material is laid down behind the pseudoplasmodium. The mature sorocarps, which do not exceed 1 mm in height, have very irregular stalks and globular-to-elongate sori with elliptical spores that measure 3.5-7 × 4.8-9.8μ. Cyst formation was not observed. The new species is of particular interest from the standpoint of its probable primitive position in the genus. 相似文献
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Onondaga Lake, possibly the most polluted lake in New York State, supports an algal flora characteristic of a eutrophic lake with an admixture of saline species. Floral diversity is noteworthy under the circumstances. Seasons in the lake may be identified by the succession of flora. High salinity of lake water results in layering at the outfall (as in an estuary, in reverse) such that river water may enter the lake at the outlet despite continuous net outflow. Certain species of algae appeared first at the outflow station and then spread through the lake. Phosphorus and nitrogen are never limiting, although seasonal diminution in the latter may influence the composition of the flora. Silica diminution was related to blooms of diatoms and may then be limiting for further growth of diatom populations. No obvious controlling relationship exists between herbivores and phytoplankton populations. The euphotic layer is typically much shallower than the thermocline. Therefore turbulence and mixing may play an important role in controlling certain populations. A brief midsummer clearing in 1969, characteristic for the lake, resulted in serious oxygen depletion and cannot be accounted for with the available data. Among metals, chromium and copper are high in the lake as the result of industrial discharges. The former may be inhibiting, the latter probably is inhibiting to algal growth. Consequently, measures underway to “clean up” the lake may result in increased blooms. Biomass calculations have been made for the major phytoplankters, and a list of 82 species is presented. 相似文献
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本文报道了叶胶耳属Phyllogloea的一个新种,命名为刘氏叶胶耳Phyllogloea liui Liu et Cao。新种模式标本为贵州省安顺地区卫生防疫站刘美华先生采自安顺市甘堡林场海拔1290m处山林内的朽枝上。新种种名即为纪念刘先生而取的。 相似文献
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From Ethiopia, a new species of streaked seedeater (Serin), the Ankober Serin Serinus ankoberensis. is described. It is closely related to S. menachensis of the Arabian peninsula, and like it, is a highland species living at around 3030 m along the top of the steep escarpment of the central highland massif. It is a terrestrial species. A nest found in March contained three white eggs in a vertical hole in an overhanging bank. 相似文献
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Julian Harber 《Curtis's Botanical Magazine》2016,33(1):24-24
Three new species of Berberis from Yunnan are described and illustrated: B. dokerlaica Harber, B. yiliangensis Harber and B. brevipedicillata Harber. The remarkable diversity of this genus in the Hengduan Mountains of south central China is discussed. 相似文献
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为了解喀纳斯湖硅藻群落分布生态状况及多样性, 对喀纳斯湖表层沉积物及水体中的硅藻进行了调查。共鉴定硅藻46属123种[1 ]。其中13种为中国新记录种, 分别为: 模糊双眉藻Amphora indistincta Levkov, 忽视双眉藻密纹变型A. neglecta f. densestriata Foged, 埃德伦星杆藻Asterionella edlundii Stoermer & Pappas, 星纹星盘藻 Discostella stelligeroides (Hustedt) Houk & Klee, 钝脆杆藻贝加尔近披针形变型 Fragilaria capucina fo. sublanceolata-baikali Flower & Williams, 马卡洛娃异极藻 Gomphonema makarovae Lange-Bertalot, 吉奥蹄形藻Hippodonta geocollegarum Lange-Bertalot, Metzeltin & Witkowski, 拟长喙蹄形藻 H. pseudorostrata Metzeltin Kulikovskiy & Lange-Bertalot, 麦特廷菱形藻 Nitzschia metzeltinii Lange-Bertalot, 机遇盘状藻Placoneis opportuna (Hustedt) Chudaev & Gololobova, 拟杆状鞍型藻 Sellaphora pseudobacillum (Grunow) Lange-Bertalot & Metzeltin, 马迪达鞍形藻 S. madida (Kociolek) Wetzel, 斯维律十字形藻Staurosira aff. sviridae Chudaev & Gololobova. 文章对此13种中国新记录种硅藻进行了详细的形态特征描述。 相似文献
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PIGMENTS FROM THE BOTTOM DEPOSITS OF AN ENGLISH LAKE 总被引:3,自引:1,他引:3
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龟鳖类寄生血簇虫六新种 总被引:3,自引:2,他引:3
血簇虫(Haemogregarina Danilewsky,1885)属真球虫目(Eucoccidia)血簇虫科(Haemogregarinidae),这一属的寄生虫,其寄主以爬行动物为主,两栖动物和鱼类也有寄生。至今已记载有300余种。龟鳖类的血簇虫研究,国内尚无报道。作者在1984年3月—1985年3月,对我国龟鳖类寄生的血簇虫进行了调查研究,共解剖检查了中华 相似文献