它们是国际物种繁殖计划的产物。
The cubs were born out of an international breeding program for endangered species.
这项技术对于在没有雌性存在的情况下保持物种繁殖具有重要作用。
Such a technique could be valuable for preserving species when no females remain.
中国的熊猫专家认为大熊猫在人工饲养的300是最小存活种群的物种繁殖和维持100年的到来。
China's panda experts believe the 300 pandas in captivity are the minimum viable population for the species to reproduce and sustain in 100 years to come.
既然它们能够而且确实可以成功杂交繁殖，它们就不能被归为不同的物种。
Since they can and do successfully inter-breed, they cannot be classed as different species.
加利福尼亚有许多土生土长的物种，比如多刺的灌木荆棘丛，依靠火来繁殖。
Many of the species native to California, such as the prickly chaparral, rely on fires to propagate.
正如你记得的那样，（物种）适应是有助于一个物种生存或繁殖的生理或行为特征。
As you recall, an adaptation is a physical or behavioral feature of a species that helps it survive and reproduce.
细胞可以转换成用于协助繁殖项目的生殖细胞，以帮助增加濒危物种基因库里的品种。
The cells could be converted into germ cells for use in assisted breeding programmes to help diversify the gene pools of endangered species, she says.
该物种的繁殖力没有明显下降。
一些由同一亲本群体进化而来的群体在繁殖上不再相容——他们进化成了不同的物种。
Some groups that had descended from the same parent population were no longer reproductively compatible—they had evolved into separate species.
显然，仅依靠种子生存或传播的植物物种更容易受到植物繁殖力下降的影响。
Plant species dependent solely on seeds for survival or dispersal are obviously more vulnerable to any decrease in plant fecundity that occurs.
喷洒杀虫剂导致的植物繁殖力下降是否真的会导致开花植物物种总数的下降，这个问题仍然没有答案。
The question of whether the decrease in plant fecundity caused by the spraying of pesticides actually causes a decline in the overall population of flowering plant species still remains unanswered.
像许多有性繁殖的物种一样，人类有特殊的性染色体。
Like many sexually reproducing species, humans have special gonosomes.
鲨鱼有三种繁殖方式，它们的繁殖方式因物种而异，分别是卵胎生、胎生和卵胎生。
Sharks display three ways to bear their young, varying by species, oviparity, viviparity and ovoviviparity.
通过影响如生长和繁殖一样的基本生命过程，海洋酸化威胁着动物的健康甚至物种的生存。
By disrupting processes as fundamental as growth and reproduction, ocean acidification threatens the animals' health and even the survival of species.
“但是，我们没有发现这种麻雀，因此我们认为，这两个物种已经形成了某种彼此之间的繁殖障阻，”萨特尔教授说。
"But we didn't find this, so we think [the two species] have formed some kind of reproductive barrier to each other," Prof Saetre said.
保护区的任务是观察，研究和繁殖频域灭绝的物种，增加它们的生存机会。
The reserve's mission is to observe, study and breed the endangered species to increase their chances of survival.
用什么措施来鼓励濒危物种的繁殖呢？
科学家们说，如果这两种鸟类已经繁殖了的话，他们将早已发现遗传学上的“中间类型”——即来自这两个物种的基因的麻雀。
If the birds had been breeding, the scientists say that they would have found genetic "intermediates" - birds with genes from both species.
刘易森称，长命物种很容易被钓丝意外缠住，因为这些生物需要很长时间才能繁殖。
Lewison said that long-lived species are particularly affected by accidental entanglement in fishing lines, because these species take so long to reproduce.
从1960年代起，科学家就已经知道某些鞭尾蜥物种无需雄性繁殖后代，就像鱼不需要自行车一样。
Since the 1960s scientists have known that some species of whiptail lizards need a male even less than a fish needs a bicycle.
但是其它一些变异则对一个物种的生存和繁殖意义重大。
But the rest can play a role in how well organisms survive and reproduce.
从最狭义的进化论观点来看，繁殖是物种生存的唯一途径。
IN the narrowest evolutionary sense, reproduction is the sole measure of success.
世界上最后一只雄性的纯种哥伦比亚盆地侏儒兔最近不幸死亡。这致使美国在实施一个旨在试图拯救这种濒危物种免于灭绝的圈养繁殖计划的过程中，仅有两只纯种的雌性侏儒兔尚存。
The last male purebred Columbia Basin pygmy rabbit has died, leaving just two females in a captive breeding program created to try to save the endangered species from extinction.
在马达加斯加和ParcBotaniqueetZoologiquedeTsimbazaza合作，狐猴之旅旨在为国际上专门繁殖狐猴的项目搜集濒危狐猴物种的信息。
Working with Parc Botanique et Zoologique DE Tsimbazaza in Madagascar, lemur Venture aims to gather information on endangered lemur species for international captive breeding programs.
虽然黑猩猩是500万年前近亲繁殖而成并导致人类出现的团伙，但是任何同物种间的相似迹象都很有趣。
Signs of anything similar in a species that, albeit a close-ish relative, parted company from the line leading to humans at least 5m years ago are therefore interesting.
虽然黑猩猩是500万年前近亲繁殖而成并导致人类出现的团伙，但是任何同物种间的相似迹象都很有趣。
Signs of anything similar in a species that, albeit a close-ish relative, parted company from the line leading to humans at least 5m years ago are therefore interesting.
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