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铜绿微囊藻(Microcystis aeruginosa)与三种丝状蓝藻间的相互作用 总被引：10，自引：0，他引：10
研究了单细胞铜绿微囊藻和三种丝状蓝藻（水华束丝藻、水华鱼腥藻及土生席藻）间的相互作用，包括以下两个方面的内容：①铜绿微囊藻细胞滤出液对水华束丝藻、水华鱼腥藻及土生席藻生长的影响；②水华束丝藻、水华鱼腥藻及土生席藻细胞滤出液对铜绿微囊藻生长的影响．研究发现，当滤出液浓度为60％（滤出液与BG11的体积比为3：2）时，铜绿微囊藻细胞滤出液对水华束丝藻、水华鱼腥藻的生长有显著促进效果，尤其对水华束丝藻的作用更加明显；对土生席藻的生长却起着微弱的抑制作用，仅表现于100％细胞滤出液中．对铜绿微囊藻而言，土生席藻细胞滤出液对其的生长起着显著抑制作用，浓度越高、抑制作用越强；而水华束丝藻、水华鱼腥藻仅在100％细胞滤出液中才表现出微弱的抑制作用．为验证营养盐浓度差异是否影响滤出液的作用效果，进行了无机营养盐（NO3-N、NH4^＋-N、PO4-P）干扰的消除试验．结果表明，无机营养盐（（NO3-N、NH4^＋-N、PO4-P）的改变并不影响滤出液的作用效果，从而我们推测水华蓝藻之间存在着化感作用．本研究为解释自然水体中藻类种群演替的原因，深入认识水华蓝藻的动力学机制提供了新的实验证据． 相似文献
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The Black Band Disease of Atlantic Reef Corals. 总被引：4，自引：0，他引：4
Abstract. The cyanophyte (Cyanobaclerium) that causes black band disease of Atlantic reef corals is described under the name Phormidium corallyticum , new species (family Oscillatoriaceae) , and its generic placement is discussed from the standpoint of the GEITLERian (classical) and D rouet systems. Distinguishing characters include densely interwoven filaments that form a blackish mat and trichomes without significant cell wall constrictions, almost isodiametric cells (4.2 μm mean width, 4.0μm mean length) tapering end cells, and thin (0.1 μm or less) mucilaginous wall coating. Transmission electron microscopy shows typical cyanophyte cell walls, sheath, nucleoplasm, and cytoplasmic inclusions, but an unusual thylakoid of straight, and, as seen in cell cross section, radiating lamellae. The dark coloration is due to a high concentration of phycocyanin and some phycoerythrin. The species is similar to Oscillatoria (= Phormidium) submembranacea , which differs in several morphological features and does not infect coral tissue. It is concluded that Phormidium should be used for this and related species that have external mucilage but not the distinct sheath found in Lyngbya. 相似文献
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