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- By aid of the monotone iteration technique and the upper and lower solutions method, the existence of travelling wave fronts is established for a single species population model with stage structure and distributed maturation delay. 利用单调迭代和上下解方法证明了一类具有分布成熟时间和阶段结构的单物种种群模型的波前解的存在性.
- Travelling wave fronts in a single species population model with stage structure 具有阶段结构的单物种种群模型的波前解
- The highest rate of poaching for a single species was more than 70 percent. 对一种鹦鹉的偷猎比例高达70%25有余。
- Both single species and whole groups of species last for very unequal periods. 单独的物种以及整个的物种群存续的时期极不相等。
- Some TSEs stick to a single species, while others ignore such boundaries. 有些TSEs只针对某一物种，而其他TSEs却设有种的界限。
- It involves the use of detailed genetic information to befter manage a species' population and, in many cases, to try to coax it back from the brink of extinction. 它通过运用详细的遗传信息而更好地控制物种的数量。在许多情况下，通过耐心细致的工作使物种摆脱濒临灭绝的境况。
- The changes of above-ground biomass, species population and biotope in the grazed and ungrazed grassland in Qinghai Gong-he Basin were studied. 试验研究青海共和盆地封育季节草场生物量、种群与生境变化结果表明，封育草地生物量和株高均高于未封育草地，且依据未封育与封育草地生物量之比，共和盆地草场退化等级为中度和重度；
- As in many widely separated families of plants, single species and single genera possess the power of revolving. 在系统相距甚远的许多不同科植物中，常常有一个单独的种或属具有这种盘绕的能力。
- The sole member of its group, such as a single species that constitutes a genus. 单型一组的唯一成员，如只组成一属的种
- It is as if our understanding of all arachnids were based on clues left by a single species of extinct spider. 这就好像我们对蛛形纲的了解，全是从一种已灭绝的蜘蛛得来的。
- Isoenzyme (isozyme) An enzyme that occurs in different structural forms within a single species. 同功酶：是某一物种中具有不同的结构类型的一类酶。
- The damaged reefs were then covered by a single species of seaweed which threatened to suffocate the coral and cause further loss. 遭到破坏的珊瑚礁被单一种类的海藻所覆盖，以致于珊瑚窒息，进而造成破坏。
- As a result, some northern hardwood forests that once had a lush understory now have but a single species of native herb and virtually no tree seedlings. 结果，有些曾经拥有丰富林下落叶层的北美硬木林，现在除了一种原生草本植物之外，实际上没有任何树苗。
- Man would have to assist in the maintenance of species populations by habitat manipulation. 人类仍将通过居住地管理来帮助保持种群体。
- A lot of single species of bacteria was seperated from the pathological changes position of the liver in sick (or dead) soft-shelled turtle which was infected by septicae-uia. 从发生败血症感染的病(死)甲鱼病变组织与肝脏中，分离到大量纯一的同种细菌。
- Consumers may be generalists (polyphagous), taking a wide variety of prey species or may specialize on single species or a range of closely related species (monophagous). 消费者可能是泛化种（多食性的），吃广范围的猎物种，或者是特化为吃一个或一组有密切关系的种（单食性的）。
- Man would have to assist in the maintenance of species populations by habitat manipulation . 人类仍将通过居住地管理来帮助保持种群体。
- According to Krause, sound can also help determine how habitat destruction alters species populations. 根据克劳瑟的看法，声音可以帮助我们判定生物栖息地遭破坏时，各物种数量的改变。
- Any fish-eating bird of the family Anhingidae (order Pelecaniformes), sometimes considered a single species (Anhinga anhinga) with geographical variants. 鹈形目蛇鹈科以鱼为食的鸟类的统称，有时认为只有一种（Anhinga anhinga），但有地理变型。
- The results are as follows: the three species populations, in spite of the flooding, remain in congregated distribution patterns. 结果表明：三种禾草主要表现为集聚型分布，水淹干扰对同一物种种群的分布格局类型影响不显著；
