查询词典 niche

Although each of the 11 species of the bark beetle had its own spatial niche and overlogs niche, they could attain competitive equilibrium and coexistance according to their requirment for different nutrition and space, the interference of population density and the different time interval attacking the host tree.

虽然，这11种小蠹虫具有各自不同的生态位宽度，且存在不同程度的生态位重叠，但各小蠹虫可依据其对寄主树木营养和空间需求的不同、种群密度的相互制约，以及入侵寄主树木时序的差异达到竞争的平衡和共存。

Limited by the population and generations, the local search ability is not good. A new niche—Braham model is brought forward. In the Braham niche, the random mating mode between chromosomes is replaced by the mating mode based on the fitness of the chromosomes.

本文提出了一种新的小生境算子—婆罗门，将简单遗传算法中的随机交配改为根据染色体的适应度进行交配，提高了遗传算法局部搜索能力，有效地防止了基因漂移。

On the contrary, the niche similarity among the species with small niche breadths was lower.

而生态位宽度较小的物种，生态位相似性比例较小。

The populations with high value of niche breadths had high niche overlap.

且生态位宽度较大的种群间生态位重叠值较高。

Niche breadths of twenty dominant species were analyzed using Shannon-Wiener niche breadth index, and the dominant species were classified into four ecological groups.

采用Shannon-Wiener生态位宽度指数和Petraitis生态位重叠指数测定了滹沱河流域湿地植被20个优势种群的生态位宽度和生态位重叠。

In multidimensional space,the niche breadths of these plants tended to expand,whereas theniche overlaps tended to decrease and the niche separations tended toincrease.

在多维生态位空间内，各植物种的生态位宽度有扩大的趋势而相互间的生态位重叠有减小的趋势，生态位分离度有增加的趋势。

Niche breadths of most native populations in natural forest were wider than that of P. armandii forest. Furthermore, competitions among populations were not so strong, and community structure was more stable, because of great niche differentiation in natural forest.

天然林中大多数乡土树种的生态位宽度较之在华山松林中大为增加，但由于长期协同进化，种间生态位分化程度高，种间竞争较缓和，群落具有很高的稳定性。

In the process of bryophyte community formation, the random process,nature of colonization, and difference in regeneration strategy can result in the niche overlap and coexistence of bryophytes, and the niche differentiation res

随机过程、物种的殖民本质以及更新策略的差异可导致苔藓植物生态位的重叠与共存，但竞争导致生态位分化也是苔藓植物共存的机理之一。

In the process of bryophyte community formation, the random process, nature of colonization, and difference in regeneration strategy can result in the niche overlap and coexistence of bryophytes, and the niche differentiation resulted from competition is also one of the mechanisms for bryophytes coexistence.

多种苔藓植物间可存在竞争等级，该等级往往随环境的变化而变化。随机过程、物种的殖民本质以及更新策略的差异可导致苔藓植物生态位的重叠与共存，但竞争导致生态位分化也是苔藓植物共存的机理之一。

It was a niche business for a niche clientele.

这是对特殊的客户制作特殊的产品。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。