Review of the potential use of brown algal ecotoxicological assays in monitoring effluent discharge and pollution in southern Australia   总被引：1，自引：0，他引：1  

Burridge TR  Bidwell J 《Marine pollution bulletin》2002,45(1-12):140-147

The temperate near-shore reefs of southern Australasia possess diverse assemblages of brown algal macrophytes which underpin major grazing and detrital food chains in medium to high energy coastal habitats. These ‘kelp' communities are at risk from effluent discharge with documented decline of macrophyte stands in areas subject to outfall. Recent studies utilising reproductive endpoints of several Australian species in ecotoxicological assays have highlighted their sensitivity to pollution. Results indicate an acceptable degree of reproducibility for assays with variation in response between taxa presumably related to differing habitat requirements and potential for stress resulting from toxicant/pollution exposure. Species studied are drawn from the orders Laminariales and Fucales, with the latter in particular offering substantial scope for further investigation. The greatest diversity of fucoid algae is found in south-eastern Australia and closely related taxa occur in similar latitudes in both the southern and northern hemispheres. The broad distribution of taxa from both taxonomic groups enables ready comparison of assays from disparate locations and offers the potential for simple, routine toxicological testing and habitat monitoring across broad geographic ranges.  相似文献   

横过阿尔金山的重力测量及初步解释     

孟令顺  齐立  高锐  管烨  陈玉明 《吉林大学学报(地球科学版)》1998,(3)

以１∶５０万比例尺,实测了新疆阿尔干－青海老茫崖重力剖面。研究了该剖面及其邻区为主的青藏高原西北边缘重力场特征;划分了３个地质构造单元及８条较大断裂;计算并分析了Ａｉｒｙ重力均衡异常及莫霍界面深度。  相似文献   

南非西德兰土瓦的金刚石砂矿     

Mars.  TR 娄华君 《山东地质情报》1989,(2):34-36

  相似文献   

OSLO裂谷重力资料解释中的理想体概念及其与地震观测的关系     

E.S.Husebye  P.C.England  I.B.Ramberg  孟令顺 《世界地质》1984,(1)

Parker 的理想体概念提供了一种在重力解释中给出严格限制的确定界限的方法.这种方法已经被利用到通过 OSLO 地堑的重力剖面上,在那里一个明显的轴向重力高以前被解释为地壳变薄以及存在一个高密度的、地幔导出的古裂谷软层或软流层岩石的综合效应。高密度侵入体的存在以及大致位置通常是由地球化学和岩石学的资料所证实的。根据 Parker 的方法的解释证实了在中下部位的地壳里存在一个高密度体的模型。但是在从 NORSAR 台阵资料的3—D 反演得到上地幔里的地震速度异常与这类异常仅仅显示出一个弱的相关并且在波罗的海地盾下面却似乎仅了解较宽的速度变化。在走时反演与重力异常之间在定性方面是吻合的,而在中下部地壳物质中,速度与密度之间的复杂关系只能利用两组数据使侵入体推测的深度达到定量上的一致。  相似文献   

在波数域计算一维重磁异常导数的Matlab语言算法   总被引：1，自引：0，他引：1  

肖锋  孟令顺  吴燕冈 《物探与化探》2008,32(3):316-320

利用Matlab内建的快速傅氏变换函数可以方便地在波数域计算重磁异常导数。介绍了基于Matlab语言的波数域求导的算法,给出了程序源代码,讨论了一些有助于提高计算精度的编程技巧。通过模型试验和数据分析,发现在计算垂向导数时波数域求导算法的精度比傅氏级数的精度有明显改善;而水平导数的计算,2种方法的精度相当。在某区钾盐勘探中,用该方法处理高精度重力剖面数据,取得了较好效果。  相似文献   

利用重力场研究东北地区断裂分布及构造分区   总被引：12，自引：0，他引：12  

杜晓娟  孟令顺  张明仁 《地球科学与环境学报》2009,31(2):200-206

为了深入研究东北地区断裂分布及构造分区,利用全国1:2 500 000布格重力异常图,分析了泛东北地区(包括东北3省及内蒙古自治区的东北部分地区)的区域重力场特征.利用布格异常变化形态,并参考地质资料,在研究区内划分出岩石圈断裂14条,壳内断裂11条.根据大兴安岭和依兰-伊通两条明显的重力异常梯级带把研究区划分出兴安、松嫩以及张广才岭等三大重力异常区,在划分断裂和分析重力场特征的基础上进行了构造分区.其研究成果为认识和研究泛东北地区油气与矿产分布提供了重力场方面的依据.  相似文献   

数字控制高分辨率海上重力     

Lafe.  TR 孟令顺 《物探化探译丛》1993,(A07):103-105

  相似文献   

GPS高程拟合转换正常高的研究   总被引：1，自引：3，他引：1  

于小平  杨国东  王凤艳  刘财  张洪波  孟令顺  许惠平  胡婷 《测绘科学》2007,32(2):40-41,53

通过对GPS测高与水准测量理论及其异同分析的基础上,阐述了确定似大地水准面的原理与方法,分析了用数学模型法,用少量GPS与水准重合点将GPS大地高直接转换为具有cm量级正常高的实现方法。实验结合黑龙江省虎林地区的地形特点,提出了用线性内插法、平面模型法和二次曲面模型法等来转GPS高程,证明在黑龙江省虎林地区可以通过少量且分布合理的水准点来直接求出该地区具有cm量级的正常高,且精度可以达到四等水准测量的精度要求,满足一般工程的需要。  相似文献   

Prior exposure to Cu contamination influences the outcome of toxicological testing of Fucus serratus embryos     

Nielsen HD  Burridge TR  Brownlee C  Brown MT 《Marine pollution bulletin》2005,50(12):1675-1680

Brown seaweeds are often employed in single species toxicity testing to study the association between the pollutant and the biota in contaminated marine habitats. We have used Fucus serratus (Phaeophyta) from one Cu resistant and one non-resistant population to evaluate the effect of prior exposure to metal pollution on toxicological endpoints. Analysis of comparative toxicity was conducted for embryo rhizoid elongation and adult relative growth rate (RGR). Algae that had previously been exposed to Cu expressed consistently lower levels of sensitivity to Cu than those that had no history of exposure to the pollutant. For both non-resistant and resistant populations rhizoid length was a more sensitive endpoint than adult RGR. While early life history stages of brown algae are generally regarded as being pollution-sensitive and inhibition of spore and embryo rhizoid elongation is frequently used as endpoints in bioassays, the test results may be affected by prior exposure of the parent algae to the pollutant. We conclude that the effect of prior exposure should be considered when comparing endpoints between studies and when selecting material for future testing.  相似文献   

The Discovery of a Second Field Methane Brown Dwarf from Sloan Digital Sky Survey Commissioning Data     

Tsvetanov ZI  Golimowski DA  Zheng W  Geballe TR  Leggett SK  Ford HC  Davidsen AF  Uomoto A  Fan X  Knapp GR  Strauss MA  Brinkmann J  Lamb DQ  Newberg HJ  Rechenmacher R  Schneider DP  York DG  Lupton RH  Pier JR  Annis J  Csabai I  Hindsley RB  Ivesic Z  Munn JA  Thakar AR  Waddell P 《The Astrophysical journal》2000,531(1):L61-L65

We report the discovery of a second field methane brown dwarf from the commissioning data of the Sloan Digital Sky Survey (SDSS). The object, SDSS J134646.45-003150.4 (hereafter SDSS 1346-00), was selected because of its very red color and stellar appearance. Its spectrum between 0.8 and 2.5 μm is dominated by strong absorption bands of H2O and CH4 and closely mimics those of Gliese 229B and SDSS 162414.37+002915.6 (hereafter SDSS 1624+00), two other known methane brown dwarfs. SDSS 1346-00 is approximately 1.5 mag fainter than Gliese 229B, suggesting that it lies about 11 pc from the Sun. The ratio of flux at 2.1 μm to that at 1.27 μm is larger for SDSS 1346-00 than for Gliese 229B and SDSS 1624+00, which suggests that SDSS 1346-00 has a slightly higher effective temperature than the others. Based on a search area of 130 deg2 and a detection limit of z*=19.8, we estimate a space density of 0.05 pc-3 for methane brown dwarfs with Teff approximately 1000 K in the 40 pc3 volume of our search. This estimate is based on small-sample statistics and should be treated with appropriate caution.  相似文献