三丁基氧化锡(TBTO)对太平洋牡蛎性成熟的影响     

李琪  尾定诚  森胜义  王如才 《中国海洋大学学报(自然科学版)》2001,31(5):701-706

利用流水饲养法研究了不同浓度的三丁基氧化锡 (0 .5 μg/ L和 1.0 μg/ L TBTO)对太平洋牡蛎卵巢中卵母细胞直径、RNA/ DNA比、蛋白质和卵黄蛋白含量的影响。卵母细胞径的增长在0 .5 μg/ L实验组受到阻碍 ,并随着 TBTO浓度的增大而更加明显。TBTO暴露组的 RNA/ DNA比在精巢中无明显变化 ,但在卵巢中显著低于对照组。 TBTO暴露组的卵巢中蛋白质和卵黄蛋白含量显示了与 RNA/ DNA比相同的变化趋势 ,表明 TBTO的积累阻碍卵黄蛋白的合成。TBTO暴露4 2 d采集的牡蛎样品中出现 3个雌雄同体 ,暗示 TBTO可能引起牡蛎发生性转变进而产生雌雄同体  相似文献   

长江口以南我国沿岸海域经济贝类中的重金属   总被引：11，自引：0，他引：11  

郑长春  詹秀美  唐文兴  许昆灿 《台湾海峡》1995,14(3):262-268

本文报道了长江口以南我国沿岸海域经济贝类中各重金属的含量及其分布趋势。结果表明，各种贝类体内Zn的含量总是最高，Hg的含量总是最低。各重金属平均含量一般呈Zn＞Cu＞As≈Cd＞Cr≈Pb＞Hg的排列顺序。该海域牡蛎的Hg、Pb、Cr、As的含量低，区域分布较均匀；Cu、Zn、Cd的含量相差悬殊，以珠海海区牡蛎的Cu、Zn、Cd含量最高，分别为431×10-6～474×106，864×10-6～1044×10-6，7．02×10-6～8．25×10-6（m／m），其主要原因可能是工业排污造成的。本调查牡蛎分布较广，对Cu、Zn、Cd有较强的积累能力，推荐它为我国局部海域海洋污染监测Cu、Zn、Cd的指示生物。  相似文献   

铑作基体改进剂石墨炉原子吸收法测定海洋生物样品中的痕量砷   总被引：10，自引：1，他引：9  

饶竹  李梅 《岩矿测试》1998,17(1):33-36

采用铑作基体改进剂,消除样品中共存磷酸盐基体的干扰,实现了用塞曼石墨炉原子吸收法测定贻贝、虾粉、牡蛎等海洋生物样品中痕量砷。方法的ＬＤ为２５ｐｇ（１０μＬ进样）,线性范围在０～１２５μｇ／ＬＡｓ。标准加入法测定砷的回收率为８５％～１０２％,１０－６水平Ａｓ的测定ＲＳＤ（ｎ＝６）小于７％,分析结果与标准样品的标准值和氢化物原子吸收法测定结果相符。  相似文献   

福建深沪湾晚更新世古牡蛎滩与晚更新世中晚期以来的地壳运动   总被引：2，自引：0，他引：2  

徐起浩  冯炎基  施建生 《国际地震动态》2002,(1):11-14

介绍了深沪湾沿岸地层、构造、海底古森林及晚更新世古牡蛎滩遗迹，深沪湾的地壳运动与古环境变迁；研究了海底古森林和晚更新世古牡蛎滩的成因。  相似文献   

Response of phytoplankton to multispecies mariculture:a case study on the carrying capacity of shellfish in the Sanggou Bay in China     

GE Changzi  FANG Jianguang  SONG Xief  MAO Yuze  YE Naihao 《海洋学报(英文版)》2008,27(1):102-112

A muhispecies model for shellfish polycuhure in the Sanggou Bay in China used for large-scale long-line cultivation of the Chinese scallop Chlamysfarreri, the Pacific oyster Crassostrea gigas and the kelp Laminaria japonica is presented. The model includes key physical processes which are the transports of matter at the system boundary, and the main biological process that is the primary production and nutrients release from the bottom. By the model, the seasonal fluctuations of phytoplankton biomass and dissolved inorganic nitrogen（DIN） in 1994 are simulated. Furthermore, if the kelp culture scale is kept constant and the Chinese scallop and the Pacific oyster culture scales are adjusted, virtual shellfish farms are funded and responses of phytoplankton to the largescale shellfish culture are simulated. According to these simulated results, the room limitation, and the hypothesis that shellfish will not grow well if the phytoplankton biomass is less than 8.2 mg/m^3 , the expandable multiple of scallop culture k and that of oyster culture y are determined as k = -0.276 5y ＋4.690 5 and 0.133 3k ＋0.006 6y≤0.667 5, where, k （ or y） is equal to 1, the culture scale of scallop （ or oyster） is 8.8 x 109 individuals （or 66 ha, with a density of 59 ind./m^2 ）, and the kelp culture scale is 3 300 ha with a density of 12 ind./m^2.  相似文献   

Evidence for elevated coastal vulnerability following large‐scale historical oyster bed harvesting          下载免费PDF全文

Christine M. Brandon  Jonathan D. Woodruff  Philip M. Orton  Jeffrey P. Donnelly 《地球表面变化过程与地形》2016,41(8):1136-1143

Living coastal barriers, such as coral reefs, tidal marshes, mangroves and shellfish beds are widely recognized for their potential role in mitigating flood risk. Limited data exists, however, for assessing the effectiveness of these natural defenses as forms of flood mitigation. In particular, very few mature shellfish beds exist today for modern study due to their destruction in the past few centuries. As an alternative method of study, we present here sedimentary reconstructions of storm overwash from coastal ponds internal to New York Harbor. We use these reconstructions to show that the initial degradation of oyster beds following European settlement of the area coincides with a significant increase in wave‐derived overwash deposition at all three of our field sites. Numerical simulations of two flood events of record in the harbor (Hurricane Sandy and a severe winter storm in 1992) were run without and with oyster beds of varying heights (1 m above the seafloor‐to‐intertidal). Simulations show that the removal of these oyster beds increases wave energy directly off‐shore of our field sites by between 30% and 200%. Sedimentary reconstructions and wave modeling experiments therefore both support oyster beds serving as a significant form of coastal protection prior to European disturbance. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

不同盐度和温度对熊本牡蛎(Crassostrea sikamea)稚贝生长与存活的影响   总被引：1，自引：0，他引：1  

王涛  李琪 《海洋与湖沼》2017,48(2):297-302

熊本牡蛎(Crassostrea sikamea)自然分布于中国长江以南沿海、日本有明海以及韩国沿海地区,具壳质坚硬、肉味清甜等特点,是巨蛎属牡蛎中重要经济种之一。为阐明熊本牡蛎稚贝生长发育的适宜盐度和温度范围,本研究分析了6个不同盐度(15、20、25、30、35和40)和5个不同温度(16、20、24、28和32°C)对熊本牡蛎稚贝生长与存活的影响。盐度实验结果显示,盐度15、20和25组中熊本牡蛎稚贝壳高和壳长显著高于盐度35和40组(P0.05),且随盐度增加,稚贝壳高、壳长表现为先升高后降低的趋势;盐度20组存活率最高,与盐度30和40组差异显著(P0.05);熊本牡蛎稚贝的适宜生长盐度为20—25,适宜存活盐度为15—25。温度实验结果显示,稚贝壳高和壳长在温度28°C组最大,随温度的降低,壳高、壳长也逐渐减小;温度20、24和28°C组存活率显著高于温度16和32°C组(P0.05);熊本牡蛎稚贝的适宜生长温度为24—28°C,适宜存活温度为20—28°C。熊本牡蛎稚贝对低盐高温有较强的适应能力。  相似文献   

Evidence of Ostrea lurida Carpenter, 1864, population structure in Puget Sound,WA, USA          下载免费PDF全文

Jake E. Heare  Brady Blake  Jonathan P. Davis  Brent Vadopalas  Steven B. Roberts 《Marine Ecology》2017,38(5)

Species traits that carry adaptive advantages such as reproductive timing and stress resilience may differ among populations. Knowledge and consideration of these traits should, therefore, be integrated into conservation efforts that include long‐term persistence of species. To test for adaptive differences between Olympia oyster, Ostrea lurida, populations a reciprocal transplant experiment was carried out monitoring survival, growth and reproduction using three established populations of O. lurida within Puget Sound, WA, USA. Performance differed for each population. Ostrea lurida from Dabob Bay had the highest survival at all sites but the lowest reproductive activity and growth. Oysters from Oyster Bay demonstrated the greatest proportion of brooding females at a majority of sites with moderate growth and survival. Together these data suggest the existence of O. lurida population structure within Puget Sound and provide information on how broodstock should be selected for restoration purposes.  相似文献   

高密度电法技术在牡蛎礁勘查中的应用效果          下载免费PDF全文

秦磊  蔡运胜  许钦环  宋广明  张宝华 《地质找矿论丛》2013,28(2):305-309

天津牡蛎礁是全新世以来海侵海退过程中在天津滨海平原留下的重要地质遗迹,是海陆变迁的佐证,对推演天津滨海平原的成陆史具有重要的科学价值。选用物探高密度电法探测手段对宁河县七里海罾口河南岸的牡蛎礁分布进行了试验研究,并布设了7个钻孔对高密度电法的探测结果进行验证。结果表明:高密度电法技术能经济、快速、有效地探测地下牡蛎礁的分布。  相似文献   

A new identification method for five species of oysters in genus Crassostrea from China based on high-resolution melting analysis   总被引：2，自引：0，他引：2  

王家丰  许飞  李莉  张国范 《中国海洋湖沼学报》2014,32(2):419-425

The high phenotypic plasticity in the shell of oysters presents a challenge during taxonomic and phylogenetie studies of these economically important bivalves. However, because DNA can exhibit marked differences among morphologically similar species, DNA barcoding offers a potential means for oyster identification. We analyzed the complete sequences of the cytochrome oxidase subunit I （COI） of five common Crassostrea species in China （including Hong Kong oyster C. hongkongensis, Jinjiang oyster C. ariakensis, Portuguese oyster C. angulata, Kumamoto oyster C. sikamea, and Pacific oyster C. gigas） and screened for distinct fragments. Using these distinct fragments on a high-resolution melting analysis platform, we developed an identification method that does not rely on species-specific PCR or fragment length polymorphism and is efficient, reliable, and easy to visualize. Using a single pair of primers （Oyster- COI-1）, we were able to successfully distinguish among the five oyster species. This new method provides a simple and powerful tool for the identification of oyster species.  相似文献