全球变暖对淡水湖泊浮游植物影响研究进展     

邓建明  秦伯强 《湖泊科学》2015,(1)

全球变暖对湖泊生态系统的影响已经成为近年来湖沼学领域的研究热点。本文首先列举了目前研究全球变暖对淡水湖泊浮游植物影响的常用方法：监测数据分析、时空转换、遥感信息提取、控制实验、模型预测和古湖沼学技术等。研究结果表明气候变暖导致的气温升高、湖泊热力分层提前破坏以及无冰期提前等因素可导致春季物候提前;在全球变暖大背景下浮游植物群落结构正朝着蓝藻占优的方向发展,但是不同地区以及不同物种对全球变暖的响应不一致。在营养盐充足的湖泊中,由于全球变暖延长了浮游植物生长季节等,从而能提高浮游植物初级生产力;但在贫营养湖泊中,浮游植物初级生产力与变暖趋势甚至可能呈负相关。由于生态系统往往是多因子的共同作用,这也使得全球变暖对浮游植物群落的影响效应复杂化,区分各因子的净影响份额是目前研究的一个难点;全球变暖引起的风场改变会促进浅水湖泊中营养盐从底泥的释放,同时也会增加水体中悬浮物的浓度而影响水下光场,因此开展气候变化对再悬浮及浮游植物群落结构的影响可能是将来研究的一个切入点。  相似文献   

Responses of lake phytoplankton to micronutrient enrichment: a study in two New Zealand lakes and an analysis of published data     

Theresa M. Downs  Marc Schallenberg  Carolyn W. Burns 《Aquatic Sciences - Research Across Boundaries》2008,70(4):347-360

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富营养湖泊中的微囊藻优势：原因—后果—对策     

Martin T. Dokulil  Katrin Teubner 《湖泊科学》1998,10(S1):357-370

Cyanobacterial dominance in lakes has received much attention in the past because of the great success and frequent bloom formation in lakes of higher trophic levels. In this paper underlying mechanism of cyanobacterial dominance are analyzed and discussed using both original and literature data from various shallow mixed and deep stratifying lakes from temperate and (subtropical regions. Examples include all four ecotypes of cyanobacteria sensu MUR et al. (1993), because their behavior in the water column is entirely different.Colony forming species (Microcystis) are exemplified from the large shallow Lake Taihu, China. Data from a shallow urban lake, Alte Donau in Austria are used to characterize well mixed species (Cylindrospermopsis) while stratifying species (Planktothrix) are analyzed from the deep alpine lake Mondsee. Nitrogen fixing species (Aphanizomenon) are typified from a shallow river-run lake in Germany.Factors causing the dominance of one or the other group are discussed as well as consequences for restoration measures. Existing knowledge on cyanobacterial dominance is summarized.  相似文献   

用TN-TP-SRSi三角形图解评价藻类组成结构的营养比动力学     

Katrin Teubner  Thomas Teubner 《湖泊科学》1998,10(S1):393-410

To show the relative availability of nitrogen, phosphorus and silica for diatoms as well as non-siliceous algae in phytoplankton communities triangular diagrams are most appropriate. Triangular diagrams for TN-TP-SRSi show the nutrient ratios TN:TP, SRSi:TN and SRSi:TP in proportion to each other at the same time.Comparison of waters, grouped according to their limnological characteristics, indicate that these groups have also different seasonal dynamics of TN, TP and SRSi in proportion to each other. From these groups, which include meso-eutrophic and hypertrophic, shallow and deep, polymictic and dimictic lakes,only the group of "flushed, hypertrophic polymictic lakes" has a high seasonal dynamic of the ratios of all three macronutrients. Moreover the relative availability of TN:TP-ratios changes from > 16:1 in spring to <16:1 in summer. Significant changes in phytoplankton structure are associated with this high dynamic of the nutrient ratios. Considerable changes in the share of cyanobacteria to diatom biomass during summer are synchronised with a powerful modification of the relative availability of TN-TP-SRSi as illustrated by the triangular diagrams.For practical purposes trophic situations are most commonly evaluated from concentrations of a single nutrient or a nutrient ratio, such as N:P. However, a complex assessment would often be more appropriate. In this context triangular diagrams have the benefit of synoptically presenting relative nutrient availability for phytoplankton communities as a whole.  相似文献   

Observations on a solar saltworks near Burgas, Bulgaria     

Penka Pavlova  Kostadinka Markova  Stephan Tanev  Joseph S. Davis 《International Journal of Salt Lake Research》1998,7(4):357-368

Data on biota and nutrients in solar ponds of a saltworks near Burgas, Bulgaria, were obtained. Surveys of the biota were undertaken, and records from management officials gave information on biological and physical conditions related to salt production. The decrease in the quality and quantity of sodium chloride harvested that began 10 to 15 years before the study, may be related to the high levels of plankton, combined nitrogen and phosphate, and the large accretion of bottom sediments and density of benthic communities. Biological management can improve the quality and quantity of the sodium chloride produced by the saltworks.  相似文献   

Phytoplankton trends in the Baltic Sea   总被引：9，自引：2，他引：9  

Wasmund  N.; Uhlig  S. 《ICES Journal of Marine Science》2003,60(2):177-186

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蓝藻氢代谢相关酶及其分子生物学研究进展     

张学成  张晓辉  徐涤 《中国海洋大学学报(自然科学版)》2006,36(1):19-25

综述了蓝藻中催化氢代谢反应的2种关键酶—固氮酶和氢化酶的生物学特征、分子基础及其编码基因和转录等最新研究进展。蓝藻在固氮细胞中的净产氢量是固氮酶和氢化酶(包括吸收氢化酶和双向氢化酶)综合作用的结果,但在非固氮情况下的产氢则主要是由双向氢化酶催化的。可通过有效利用基因工程技术对产氢相关酶基因进行改造,改进生物产氢系统。  相似文献   

Recent Occurrences of Dinophysis fortii (Dinophyceae) in the Okkirai Bay, Sanriku, Northern Japan, and Related Environmental Factors     

Kazuhiko Koike  Hirotaka Otobe  Minoru Takagi  Tadahisa Yoshida  Takehiko Ogata  Takashi Ishimaru 《Journal of Oceanography》2001,57(2):165-175

Occurrence of Dinophysis fortii, a causative organism of diarrhetic shellfish poisoning, in the Okkirai Bay, Sanriku was surveyed in 1995, 1996, 1998 and 1999. In each year, its major occurrence was detected from the late May or early June and continued until the late June or early July. Seawater temperature, salinity and nutrients measurements suggested that inflows of offshore water into the bay played key role on the first major occurrence of D. fortii. With an analysis of continuous temperature data in the Otsuchi Bay which locates north of the Okkirai Bay, this influent was considered to be intermittent inflow of the offshore water by internal tidal waves which propagated from north to south. First occurrence peak of D. fortii was synchronous with phycobilin containing microalgae, synechococcoid cyanobacteria and cryptomonad, in all years. In vivo fluorescence measurement of D. fortii cells in 1995 and 96 showed that the cells in these microalgal-rich water contained more phycobilin pigment than those in the microalgal-poor water. The result may support a hypothesis that D. fortii acquires phycobilin by an uptake of these microalgae. After the first major occurrence in the bay, D. fortii sometimes occurred in rather inshore waters where showed elevated ammonium level possibly due to increased heterotrophic activity. Together with another finding that D. fortii is mixotrophic, it could be assumed that the environment being suited to heterotrophic nutrition also stimulates D. fortii growth in the bay.  相似文献   

The Cawthron Institute Culture Collection of Micro-algae: a significant national collection     

L Rhodes  KF Smith  L MacKenzie  SA Wood  K Ponikla  DT Harwood 《新西兰海洋与淡水研究杂志》2016,50(2):291-316

The Cawthron Institute Culture Collection of Micro-algae (CICCM) is a unique, nationally and internationally significant collection of 450 strains of approximately 100 micro-algae and 50 cyanobacteria species, both living and cryopreserved. The collection comprises 13 taxonomic classes and underpins research into the ecology and taxonomy of the isolates and the biotoxins they produce and their toxicity. The CICCM expanded significantly in the 1990s after a major harmful algae bloom event in the Hauraki Gulf, New Zealand. Since 2000, it has underpinned development of molecular detection tools and enabled development of new chemical testing methods for biotoxins in seafood. The tropical collection allows research into potential issues for New Zealand as the oceans warm, for example, the risks of ciguatera fish poisoning and palytoxins in seafood. Research results generated from isolates in the cyanobacterial collection have assisted national risk management regarding drinking water and informed the development of the New Zealand guidelines for managing cyanobacteria in recreational fresh waters. The actual living and cryopreserved micro-algae and cyanobacteria collection (without infrastructure) has a current estimated value of NZ$1.6 million.  相似文献   

Taxonomic and Ecological Characterization of Cyanobacteria from Some Brackish and Saline Lakes of Southern Transbaikal Region     

Tsyrenova Dulma  Namsaraev Bair 《《地质学报》英文版》2014,88(Z1):103-104

正Brackish and saline lakes are common in the arid zones of the Earth.They are unique ecosystems with extremely high p H values and high mineralization levels(up to saturating concentrations).These lakes are inhabited by  相似文献