Effects of Cadmium-Spiked Sediment on Cadmium Accumulation and Bioturbation by Nymphs of the Burrowing Mayfly Hexagenia bilineata     

Bartsch  Michelle R.  Cope  W. Gregory  Rada  Ronald G. 《Water, air, and soil pollution》1999,109(1-4):277-292

We assessed accumulation of cadmium (Cd) and bioturbation by nymphs of the burrowing mayfly Hexagenia bilineata as indicators of exposure to Cd-spiked sediment in a 21-d test. Surficial sediments (top 5 cm) from Pool 7 of the Upper Mississippi River were spiked with Cd to concentrations of 3, 7, and 15 μg Cd g^-1 dry weight. The experimental design was completely randomized, with three Cd-spiked sediment treatments plus an unspiked sediment control (1 μg Cd g^-1 dry weight), and 10 nymphs in each of six replicates per treatment. Nymphs accumulated Cd during the 21-d exposure; mean concentrations varied from 0.22 to 6.24 μg g^-1 dry weight, and tissue concentrations were correlated with Cd concentration in unfiltered test water (r = 0.93, P <0.01) and test sediment (r = 0.93, P <0.01). The effect of Cd on bioturbation by nymphs, as indicated by turbidity, differed significantly among treatments (P = 0.045) and over time within treatments (P = 0.01). Turbidity progressively decreased as Cd concentration in the sediment increased, up to 7 μg g^-1; however, turbidity in the 15 μg g^-1 treatment (our greatest exposure concentration) did not differ significantly from the control. Concentrations of Cd in unfiltered, overlying test water increased significantly within treatments during the test, indicating that nymphs mobilized sediment-associated Cd into the overlying water, presumably through burrowing and respiratory activities.  相似文献   

Coastal zone planning: a geophysical classification of inlets to define ecological representation     

Michelle E. Greenlaw  John C. Roff  Anna M. Redden  Karel A. Allard 《水产资源保护:海洋与淡水生态系统》2011,21(5):448-461

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中国五大湖三角帆蚌群体遗传多样性的RAPD分析     

李家乐钱荣华  鲍宝龙汪桂玲 戚鸟定 《上海海洋大学学报》2005,14(1):1-5

用OPJ和OPM两组40条10碱基随机引物,对中国五大湖三角帆蚌地理群体及诸暨养殖蚌进行了随机扩增多态性DNA(RAPD)分析,其中12个引物的扩增结果具有丰富的群体多态性,多态率为55.6%～80%。群体内遗传相似度大小依次为:鄱阳湖(0.8889),太湖(0.8694),洞庭湖(0.8111),诸暨(0.7746),洪泽湖(0.7348),巢湖(0.7185)。依据群体间遗传距离指数及分子系统树,表明洞庭湖群体和洪泽湖群体亲缘关系最近,鄱阳湖群体则与巢湖群体的亲缘关系最近,并且诸暨人工养殖群体与鄱阳湖和巢湖的群体比较接近。  相似文献   

Creating community‐based indicators of gender equity: A methodology     

Michelle Carnegie  Katharine McKinnon  Katherine Gibson 《Asia Pacific viewpoint》2019,60(3):252-266

It appears that an almost unquestioned development pathway for achieving gender equity and women's empowerment has taken centre stage in mainstream development. This pathway focuses on economic outcomes that are assumed to be achieved by increasing women's access to material things, including cash income, loans, physical assets, and to markets. Gender equity indicators, which measure progress towards these outcomes, cannot escape reinforcing them. We argue that far from being neutral, indicators are embedded in political and ideological agendas that serve as guides to the appropriate conduct of those whose performance or behaviour is being measured. Drawing on participatory feminist, diverse economies and strengths based approaches, we outline a research methodology for developing community‐based indicators that recognises women's and men's participation and relationships in all spheres of life, including the ‘non‐economic’. If indicators are grounded in local meanings and realities, we propose that community members can use them to identify aspirational goals for gender equity, and measure progress towards these goals.  相似文献   

Potential of the European earwig (Forficula auricularia) as a biocontrol agent of the soft and stone fruit pest Drosophila suzukii     

Adam Bourne  Michelle T Fountain  Herman Wijnen  Bethan Shaw 《Pest management science》2019,75(12):3340-3345

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Governing transboundary commons in Southeast Asia     

Michelle A. Miller  Jonathan Rigg  David Taylor 《Asia Pacific viewpoint》2020,61(2):185-189

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Environmental Quality and Cytogenotoxic Impact of the Waters of a Stream Receiving Effluents from Tannery Industry     

Viscardi  Michelle Hoffelder  da Silveira  Luís Felipe  Vargas  Luciano Kayser  da Silva  Fernanda Rabaioli  Beneduzi  Anelise 《Water, air, and soil pollution》2020,231(6):1-16

Water, Air, & Soil Pollution - Cu-based copper nanoclusters have generated a great deal of interest based on for their fluorescent and catalytic properties. However, as heterogeneous catalysts,...  相似文献   

高产早熟辣椒新品种辣冠3号     

张秀荣  张保才  刘亮希  巫都  胡文兵  刘峥 《蔬菜》2023,(8):69-70

为实现辣椒种植高产、高效，选育了早熟、质优、丰产的辣椒新品种辣冠3号。经过多年多点试验示范，辣冠3号表现出植株生长势强、分枝多，连续坐果能力强，果实线形，青熟果绿色，口感品质好等优势；结合良种良法，可实现667 m²产量3 200 kg以上，667 m²产量1.2万元左右，丰产性好，经济效益显著。  相似文献