南极磷虾与南大洋生态系统

南极磷虾在南极生态系统中起着至关重要的作用,是南大洋生态系统中初级生产的主要消费者,同时又是鱼类、乌贼、海豹、海鸟和鲸类的主要食物。由于其巨大的生物量,使其成为潜在的巨大渔业资源。     

具非线性中立项的二阶时滞微分方程的振动准则

利用积分平均技巧,建立了一类具有非线性中立项的二阶时滞微分方程的振动准则,推广并改进了一些已有的结果。     

Variation of the NAO and NPO associated with climate jump in the 1960s

The interannual variation of the North Atlantic Oscillation (NAO) and North Pacific Oscillation (NPO) and its relationship with the climate jump in the Northern Hemisphere in the 1960s, are discussed using the data analyses. It is clearly shown that the amplitudes of the NAO and NPO were all increased obviously in the 1960s and the main period of the oscillations changed from 3–4 years before the 1960s to 8–15 years after the 1960s. Therefore, the climate jump in the 1960s is closely related to the anomalies of the NAO and NPO.     

一类二阶拟线性的偏微分系统的振动性定理

本文讨论了一类二阶具时滞的偏微分系统,建立了方程组所有解振动的充分条件,同时也给出了实际应用例子．     

偶数阶中立型偏泛函微分方程组解的振动定理

研究一类具有偏差变元的偶数阶中立型偏微分方程组解的振动性,利用微分不等式方法和微积分技巧,建立了该类方程组振动的若干充分条件,主要结果由一些实例加以阐明．     

有振动系数的一阶中立型泛函微分方程的振动性

本文讨论了有振动系数的一阶中立型基泛函微分方程解的振动性,得到了方程解振动的几个充分条件,并将已有的关于一阶滞后型方程的结论推广到中立型泛函徽分方程。     

新疆玛纳斯河径流波动与北大西洋涛动的关系

对新疆玛纳斯河流量资料、北疆地区温度、降水资料进行整理,分析了其变化的特征和规律,并将其与北大西洋涛动指数进行了对比分析.研究发现,冬季北大西洋涛动指数与玛纳斯河冬季流量呈现显著的正向变化关系,夏季两者的关系则相反.利用交叉小波变换,分别发现了冬、夏季北大西洋涛动指数与玛纳斯河流量变化关系最密切的振荡周期.文中还发现冬、夏季北大西洋涛动指数与北疆温度、降水的变化也存在显著的相关关系.     

A limnological reconnaissance of the Falkland Islands; with particular reference to the waterfleas (Arthropoda: Anomopoda)

Forty‐eight freshwater bodies on the Falkland Islands, including 33 lakes and pools, and 12 rivers and streams, were sampled for freshwater invertebrates. This study yielded 129 species of invertebrates (79 Rotifera, 34 Arthropoda, six Platyhelminthes, three Gastrotricha, two Nematoda, two Annelida, two Mollusca, and one Tardigrada) plus two fish species bringing the known Falkland Islands freshwater fauna to more than 170 species. While the presence of fishes, molluscs, amphipods, caddis larvae, waterboatmen, parasitic cercaria, and truly planktonic rotifers make the Falkland Islands fauna markedly richer than any subantarctic, or maritime Antarctic island, it is nevertheless sparse when compared with other temperate and tropical locations.     

Not as clear as expected: what genetic data tell about Southern Hemisphere corellids (Ascidiacea: Phlebobranchia)

ABSTRACT

The morphology of corellids (Ascidiacea) has led to numerous misidentifications and wrong taxonomic decisions over the last century. Paradoxically, the morphology has also enabled new species to be identified and ancient entities to be re-established in the Southern Hemisphere. There are many examples of the integration of morphological and molecular data leading to the same taxonomic conclusions, and therefore we aimed to analyse DNA sequences of the gene cytochrome oxidase subunit I of currently accepted species within Corellidae occurring in the Southern Hemisphere. Haplotype networks along with phylogenetic trees and genetic distances not only corroborate the distinction between Corella eumyota and Corella antarctica, but also separate the latter into two potential groups, one located in Terre Adélie and the other in the Antarctic Peninsula (AP). Furthermore, the C. antarctica group from the AP was closely related to the allied abyssal species, Corynascidia suhmi from Terre Adélie. Although the number of new sequences is reduced, our results are congruent with a long record of suspicion on the matter and stress the need for deeper and more extensive investigation of this ascidian family.