共查询到20条相似文献，搜索用时 46 毫秒
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采用室内实验生态学方法对尖紫蛤的滤水率、摄食率和吸收率进行了研究。结果表明,盐度为2~18时,3种规格尖紫蛤的滤水率和摄食率先升后降,在盐度10.50~12.10内滤水率和摄食率出现最大值,最佳摄食盐度为11.41~12.10;pH在6.4~9.4时,3种规格尖紫蛤的滤水率和摄食率先升后降,在pH为8.23~8.45内滤水率和摄食率出现最大值,尖紫蛤最佳摄食的pH为8.23~8.28。尖紫蛤的吸收率与盐度的相关性不大。 相似文献
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《广东海洋大学学报》2019,(6)
【目的】了解尖紫蛤(Soletellina acuta)壳形态性状对体质量的影响。【方法】随机测量120个20月龄人工养殖的尖紫蛤,以壳形态性状壳长X1、壳高X2、壳宽X3为自变量,体质量性状活体质量mL和软体质量mM为因变量建立壳形态性状对体质量影响的最优回归方程。【结果】壳形态性状与活体、软体质量的相关系数都达到了极显著性水平(P <0.01),壳长和壳宽是决定尖紫蛤活体质量的主要因素,而壳长和壳高是决定尖紫蛤软体质量的主要因素。采用逐步回归方法得到最优回归方程:mL=-62.105+0.647 X1+0.726 X2+0.779 X3、mM=-26.116+0.240 X1+0.439 X2+0.322 X3,回归关系达到极显著水平(P <0.01)。【结论】20月龄尖紫蛤壳壳长是和壳宽、壳长和壳高分别是决定尖紫蛤活体质量、软体质量的主要因素,为尖紫蛤的选择育种提供形态学证据,可首选壳长。 相似文献
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紫蛤生态的观察 总被引：1，自引：1，他引：0
劳赞 《广东海洋大学学报》2003,23(3):22-25
对紫蛤Soletellina violacea Lamarck的生活环境、生活习性与分布等进行了观察,并研究了相对密度对紫蛤成活率的影响。结果表明,紫蛤生活在中低潮区至潮下带15～30cm的细沙底,自然分布海区的水温变化范围为9～33℃,pH值为6.9～8.6,海水相对密度的适宜范围为1.004～1.029,最适相对密度范围为1.005～1.027,以有机碎屑和硅藻为主要食料。雌雄异体,一年有二次繁殖期。鲜出肉率为59.99％,24h 60℃烘干后的干出肉率为11.75％。 相似文献
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紫蛤生态的观察 总被引：1，自引：0，他引：1
劳赞 《广东海洋大学学报》2003,23(3):22-25
对紫蛤Soletellina violacea Lamarck的生活环境、生活习性与分布等进行了观察，并研究了相对密度对紫蛤成活率的影响。结果表明，紫蛤生活在中低潮区至潮下带15-30cm的细沙底，自然分布海区的水温变化范围为9-33℃，pH值为6．9-8．6，海水相对密度的适宜范围为1．004—1．029，最适相对密度范围为1．005—1．027，以有机碎屑和硅藻为主要食料。雌雄异体，一年有二次繁殖期。鲜出肉率为59．99％，24h60℃烘干后的干出肉率为11．75％。 相似文献
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为了解鉴江放射性含量,分别在鉴江流域布设了5个水质和底泥监测点,取样进行总α和总β分析,并与省内本底调查资料比较,结果表明:鉴江水质中放射性含量上下游都比较低,而底泥的放射性含量则下游略高于上游;鉴江底泥放射性含量也低于省内各地土壤放射性含量的平均值;鉴江水质放射性总α和总β符合生活饮用水卫生标准。 相似文献
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对应用荧光分光光度法测定海洋生物中还原型谷胱甘肽(GSH)含量的方法进行了研究,并测定了分属于鱼、虾、贝、藻的10种海洋生物中谷胱甘肽的含量。利用邻苯二甲醛与GSH反应构成的荧光体系,在激发波长为365nm,发射波长为425nm的条件下,方法的回收率为99.22%~99.69%,变异系数为2.16%。应用此方法测得10种海洋生物中谷胱甘肽的含量为:红笛鲷(Lutjanussanguineus)0.399mg/g,银鲳(Pampusargenteus)0.352mg/g,大海鲢(Megalopscyrinoides)0.561mg/g,尖紫蛤(Sanguinolariaacuta)0.289mg/g,菲律宾蛤仔(Ruditapesphilippinarun)0.287mg/g,墨吉对虾(Penaeusmerguiensis)0.892mg/g,凡纳滨对虾(Litopenaeusvannamei)1.434mg/g,囊藻(Colpomeniasinu-ose)0.221mg/g,石莼(Ulvalactucal)0.727mg/g,马尾藻(Sargassummuticum)0.137mg/g。 相似文献
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西藏一江两河地区人口分布与地形要素关系分析 总被引：2，自引：0，他引：2
地形条件是影响区域人口分布的最基本的因素之一,本文基于1 km×1 km人口空间分布公里网格数据定量分析一江两河地区人口分布基本特征及其与高程、坡度、坡向、地形起伏度等地形要素之间的关系,有助于揭示西藏高原人口分布现状的本质、理解人口空间分布结构特征,对于今后宜居地选址、改善农牧民人居环境、制定区域经济发展政策,促进区域内人口、资源与环境可持续发展具有重要意义。研究结果表明：① 一江两河地区90%的区域人口密度不足10人/km2,80%的人口分布在不足5%的土地上,人口分布比较集中。当前一江两河地区有2个主要的人口集中区,分别是拉萨市城关区和日喀则地区日喀则市,拉萨市城关区尤其显著。② 一江两河地区人口沿河分布,80.46%的人口居住在距离河流10 km以内区域,人口总数、人口密度与距河流距离呈明显的指数关系,距离河流2 km以内的区域人口密度高于50人/km2;③ 近99%的人口分布在海拔4500 m以下,当高程超过3800 m时,人口密度随海拔升高呈下降趋势;④ 近70%的人口分布在坡度小于15°的区域,而且随着坡度越大,人口密度越小,人口分布受坡向的影响不明显;⑤ 地形起伏度对人口分布的影响显著,近85%的人口分布在地形起伏度小于800 m的区域,人口密度与地形起伏度之间为倒指数关系。 相似文献
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为了解鉴江放射性含量，分别在鉴江流域布设了5个水质和底泥监测点，取样进行总α和总β分析，并与省内本底调查资料比较，结果表明：鉴江水质中放射性含量上下游都比较低，而底泥的放射性含量则下游略高于上游；鉴江底泥放射性含量也低于省内各地土壤放射性含量的平均值；鉴江水质放射性总α和总β符合生活饮用水卫生标准。 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献
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《极地研究(英文版)》2014,(4)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose 相似文献
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《中国海洋大学学报(英文版)》2014,(4)
<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail 相似文献
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《中国海洋大学学报(英文版)》2014,(6)
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo- 相似文献
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Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a 相似文献
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As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m. 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献