铜离子对克氏纺锤水蚤影响的初步研究

通过对胶州湾附近水域中浮游桡足类优势种之一克氏纺锤水蚤（Acartia clausi Giesbrecht)进行不同浓度梯度铜离子的毒性实验。探讨了重金属污染对浮游桡足类的影响。实验结果表明，铜离子对克氏纺锤水蚤96h的LC50为38．12μg/L。用回归分析方法探讨了铜离子与克氏纺锤水蚤产卵量之间的关系，得出拟合曲线方程为y=16.19 0.622X-0.0264X^3(y-产卵量：X－铜离子浓度）；曲线走向表明，低浓度的Cu^2 对克氏纺锤水蚤的产卵有一定的促进作用。对Cu^2 与卵的孵化率的关系也作了类似的分析。结果两者呈线性负相关，说明Cu^2 对克氏纺锤水蚤卵的孵化纺的影响要大于产卵量的影响。     

渤海风暴潮数值预报的个例研究

本文叙述利用风暴潮模式和斜压大气模式耦合进行温带风暴潮预报.应用边界层阻尼定律预报风暴潮模式所需的海面风应力.本文进行了渤海风暴潮的个例研究.预报结果清楚地显示了温带风暴潮的特性.一些个例研究指出,风暴潮模式和计算风应力方案是令人满意的,而风暴潮预报精度非常依赖于气象预报.     

Environmental tolerance of Caprella mutica: implications for its distribution as a marine non-native species

Physiological tolerances limit the distribution of marine species, with geographical ranges being set by environmental factors, such as temperature and salinity, which affect the rates of vital processes and survival of marine ectotherms. The physiological tolerances of the non-native marine amphipod Caprella mutica were investigated in laboratory experiments. Adult C. mutica were collected from a fish farm on the west coast of Scotland and exposed to a range of temperatures and salinities for 48 h. C. mutica were tolerant of a broad range of temperature and salinity conditions, with 100% mortality at 30 degrees C (48 h LT50, 28.3+/-0.4 degrees C), and salinities lower than 16 (48 h LC50, 18.7+/-0.2). Although lethargic at low temperatures (2 degrees C), no mortality was observed, and the species is known to survive at temperatures as low as -1.8 degrees C. The upper LC(50) was greater than the highest salinity tested (40), thus it is unlikely that salinity will limit the distribution of C. mutica in open coastal waters. However, the species will be excluded from brackish water environments such as the heads of sea lochs or estuaries. The physiological tolerances of C. mutica are beyond the physical conditions experienced in its native or introduced range and are thus unlikely to be the primary factors limiting its present distribution and future spread.     

The effect of the "Prestige" oil spill on the plankton of the N-NW Spanish coast

Chlorophyll, primary production, zooplankton biomass and the species composition of phytoplankton and zooplankton were studied in 2003, after the Prestige shipwreck. The information obtained was compared to previous data series available for the area affected by the spill. A large data series on plankton variables for the N-NW Spanish coast existed, and therefore a realistic evaluation of the effects by comparison with the range of natural variability could be carried out. We emphasized the evaluation of impact during the spring bloom, the first important biological event after the spill. Some minor changes were observed occasionally, but they did not show any clear pattern and were more related to the natural variability of the ecosystem than to effect of the spill. Plankton community structure did not undergo any changes. Only a few species were more abundant during spring 2003 than in previous years. No significant changes were detected in the planktonic community during productive periods, such as the spring bloom and the summer blooms related to intrusions of East North Atlantic Central Waters. The lack of evidence of the effects of the spill on planktonic communities is discussed in terms of the characteristics of the fuel, the high dynamics of the water masses, the biological mechanisms through which the fuel from the surface waters is transferred to the sea floor and, particularly, the influence of the natural variability by means of large and meso-scale hydrographic processes in the area under study. At the present time it is not possible to determine any minor effects the spill may have had on the plankton owing to the great variability of the planktonic cycles and the short-term impact of the oil from the Prestige on the pelagic system.     

华夏龙谱(18)——邹氏尾羽龙(Caudipteryx zoui)

1998年中国地质博物馆季强和姬书安、美国自然历史博物馆ＰｈｉｌｉｐＪ .Ｃｕｒｒｉｅ和ＭａｒｋＡ .Ｎｏｖｅｌｌ对 2件产自辽宁省北票市上园乡四合屯上侏罗统义县组下部湖相沉积火山凝灰质页岩的带羽毛印痕的脊椎动物骨架化石研究后 ,确认其是一种长羽毛的小型兽足类恐龙。为感谢当时的中国副总理邹家华对辽西古生物研究的大力支持 ,特将其命名为邹氏尾羽龙。特征 :体长近 1ｍ。前上颌骨具长而钩形的牙齿 ,齿根宽。上颌骨和齿骨无牙齿。尾短 (仅为体长 1/ 4 )。前肢较长而指爪较短。后肢长而粗壮。尾末端和前肢第 2指骨分别排列生长着长…     

许昌夏季降水的天气系统分型

通过对1982-1991年10年高空、地面天气图及许昌市辖4站地面降水资料的分析，对影响许昌的168次中雨以上降水过程前的高空及地面天气形势划分出了六种天气型，并简要指出了各型的高空、地面天气形势特征．