科创中国

下一步是增加空气系统.为了取消在USB项目7516-OCAT网箱的沉没测试中计划测试所需要的潜水呼吸器,必须安装空气系统.在下部和斜管的HDPE上钻孔并攻丝用于注入和排放空气和水(图17).安装了铜的输入阀门和管接头.所有进气阀和管接头都是3/8英寸的.斜管和底部管子上的进水管阀门是0.75英寸的,这样能加速管内水的注入和排放.在阀门的螺纹上使用了螺纹密封剂(液态的Teflon)以确保阀门不会漏气.经验证明在HDPE管子上钻孔和攻丝的方法能取得很好的效果.

总结了近年来在鱼类物种鉴定中常用的DNA序列分析、DNA指纹技术、物种特异性聚合酶链式反应和实时荧光PCR技术等DNA检测方法,同时对各类方法的特点和局限性进行了分析.

将镀铜镉柱应用于流动注射(FIA),通过三通阀自动控制,实现了水中硝酸盐氮和亚硝酸盐氮的同时测定.在盐酸介质中,亚硝酸盐与磺胺发生重氮化,然后与N-(1-萘基)-乙二胺盐酸盐相偶合,形成玫瑰红色的偶氮染料,在530nm处有较大吸收,硝酸盐被镉柱在线还原为亚硝酸盐后同法测定.硝酸盐和亚硝酸盐的测定范围分别为2~50μg/L、20~1000μg,/L,检出限分别为0.33μg,/L和0.66μg/L,精密度RSD为0.73%和1.48%,测定频率为16样/h.实际水样中硝酸盐和亚硝酸盐的测定取得了满意的效果,加标回收率均在95.3%~111.0%之间.该方法简单、快速、重现性好,可应用于实际检测.

老挝含盐盆地白垩纪时期位于新特提斯域东南部,晚白垩世沉积了巨型钾盐矿床.其中,万象东南部的他曲盆地钻孔含盐系中硬石膏δ34SV-CDT值集中分布在13.8‰~ 15.3‰,与同期海相蒸发岩δ34S值近似,表明石膏为海相成因.据此,也进一步证实老挝含盐盆地成钾物质大多来自于同时期的古海水,但同时也受到大陆水的掺杂.依据老挝含盐盆地与思茅盆地钾盐矿床沉积时代相近,同时结合勐野井组石膏硫同位素组成,笔者初步认为两盆地在硫同位素组成上具有相近的海源特征,推断它们在海侵期可能曾连通.

8月15日,"福海县冷水鱼成果转换转化中心项目"苗种繁育车间建设项目经5周时间,完成了安装和调试工作.该系统包括亲鱼培育系统、矩形池孵化系统、圆形鱼苗培育系统、温控系统、车间的电气控制及增氧系统组成,各系统目前已能正常连续运行.

观察并量化鱼类面对诸如拖网等主动式采样器具时的行为是一个挑战.应用一种高频成像声纳(DIDSON)在中等到富营养的水库直接观察并记录了鱼类在一张主动式中上层拖网网口前的躲避行为.在这个多鱼种水库环境中鱼类表现出了多样的行为模式.声学分析显示,在拖网区域内鱼类有76%被捕获,有24%则游出了该区域.

Relationship between species' home range and their other biological traits remains poorly understood, especially in migratory birds due to the difficulty associated with tracking them. Advances in satellite telemetry and remote sensing techniques have proved instrumental in overcoming such challenges. We studied the space use of migratory ducks through satellite telemetry with an objective of understanding the influence of body mass and feeding habits on their home-range sizes. We marked 26 indi- viduals, representing five species of migratory ducks, with satellite transmitters during two consecutive winters in three Indian states. We used kernel methods to estimate home ranges and core use areas of these waterfowl, and assessed the influence of body mass and feeding habits on home-range size. Feeding habits influenced the home-range size of the migratory ducks. Carnivorous ducks had the largest home ranges, herbivorous ducks the smallest, while omnivorous species had intermediate home-ranges. Body mass did not explain variation in home-range size. To our knowledge, this is the first study of its kind on migratory ducks, and it has important implications for their conservation and management [Current Zoology 60 (5): 616-621, 2014].

ATPase?6/8?gene?(842?bp)?of?mitochondrial?DNA?was?sequenced?in?Labeo?rohita?samples?(n?=?253)?collected?from?nine?rivers?belonging?to?four?river?basins;?Indus,?Ganges,?Brahmaputra?and?Mahanadi.?Analysis?revealed?44?haplotypes?with?high?haplotype?diversity?(Hd)?0.694?and?low?nucleotide?diversity?(π)?0.001.?The?within?population?variation?was?larger?(83.44%)?than?among?population?differences?(16.56%).?The?mean?Fsv?value?(0.166;?P?〈?0.05)?for?overall?populations?revealed?moderate?level?of?genetic?structuring?in?the?wild?L.?rohita?populations.?The?haplotype?network?presented?a?single?clade?for?wild?L.?rohita?population,?from?different?rivers.?Negative?values?for?Fu's?index?(Fs),?mismatch?distribution?analysis?indicated?period?of?expansion?in?L.?rohita?population.?The?time?after?recent?expansion?was?estimated?for?each?population,?between?0.042?to?0.167?mya.?The?pattern?of?Isolation?by?Distance?(IBD)?was?not?significant?(r?=?-0.113,?P?〈?0.287),?when?all?the?sampling?locations?were?compared?(Mantel?test),?however,?when?an?outlier?(Indus,?Brahmaputra?and?Mahanadi)?was?removed?from?the?whole?population?set,?a?clear?positive?correlation?between?pairwise?Fsv?and?geographic?distance?(Km)?was?seen.?The?analysis?of?data?demonstrated?that?ATPase6/8?gene?polymorphism?is?a?potential?marker?to?understand?genetic?population?structure?of?wild?L.?rohita?existing?in?different?rivers.?The?study?identified?population?substructure?in?wild?L.?rohita?with?common?ancestral?origin?[Current?Zoology?60?(4):?460--471,?2014].