The common ancestor is, however, too recent for the new species to be a remnant of the first human excursion from Africa.
然而，共同的祖先对于新物种又太现代，而不能作为来自非洲的人类首次远足的遗迹。
In recent years, many people have been questioning whether it is worth the time and money organizations spend on trying to save endangered species.
近年来，许多人一直在质疑各种组织在拯救濒危物种上花费的时间和金钱是否值得。
Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.
某些种类的北极鸟受到近来雪雁数量急剧增加的威胁，这些雪雁在北极繁殖，并且正在取代生命力较弱的鸟类。
A recent study of ancient and modern elephants has come up with the unexpected conclusion that the African elephant is divided into two distinct species.
一项针对古代和现代大象的研究得出一个出人意料的结论：非洲大象已经分化成两个不同的物种。
Recent studies, however, have uncovered new instances of a counting skill in different species, suggesting that mathematical abilities could be more fundamental in biology than previously thought.
而最近的一些研究发现不同物种具有数数儿能力的例子，说明算术能力在生物中比之前认为的更普遍。
As we have previously reported, Amur tiger populations have dropped precipitously in recent years to around 250 animals, and the species faces a genetic bottleneck that puts it at risk of inbreeding.
我们之前的报道指出，它们的数量在最近几年锐减到250只左右，这个种族面临着遗传瓶颈，这将它们推入了近亲繁殖的危险境地。
New species are constantly being discovered, however, such as the ones pictured in this slideshow, collected during the recent Census of Marine Life.
然而，新的物种不断被发现，诸如在这个幻灯片里拍到的照片，就是最近海洋生物普查收集而来的。
The common ancestor is, however, too recent for the new species to be a remnant of the first human excursion from Africa, the one that led to Java man and Peking man, now known as Homo erectus.
然而共同的祖先对于新人种又太现代，而不能作为来自非洲的人类首次远足的遗迹，那次远足产生了现在被称为直立人的爪哇猿人和北京猿人的祖先。
While some have suggested that genetic "hair-splitting" has inflated the number of new species, recent studies have shown that "taxonomic inflation" is the exception, not the rule.
尽管有些人认为，基因上的“吹毛求疵”带来了太多的新物种，但最近的研究显示，分类学上的“通货膨胀”只是例外，并非常态。
While that's still open to debate, it's plausible that the most recent glacial period left its mark on our species.
尽管那种说法还处于争论当中，最近的冰河期大多在我们身上留下了印记却是真实可信的。
Until recent years, chimaeras hadn't received much study, so people treated the similar-looking creatures found in different spots across the world as the same species.
直到最近几年，嵌合体都没有得到太多的研究，因此人们认为长得十分相似，在世界各地的不同地点的同一物种中的生物。
Such discoveries place Lao PDR among one of the few countries in the world where several entirely new species of large mammals have been found in recent years.
这些发现使老挝成为世界上近年来发现了一些全新大型哺乳动物物种的少数几个国家之一。
Species outlook: Still thriving despite recent overhunting.
种属前景：尽管最近遭受过度猎杀，仍将蓬勃发展
The big cat remains were unearthed during recent field expeditions and have been identified as new species belonging to the genus Lokotunjailurus and the genus Megantereon.
这些大型猫科动物的遗骸是在最近的野外考察中发掘的，经鉴定属于Lokotunjailurus属和Megantereon属的新物种。
The Omars' banded knifefish (Gymnotus omarorum) is well-known in its native Uruguay—or at least researchers thought until a recent revelation found it to be another species.
奥马斯条纹电鳗(Gymnotusomarorum)在乌拉圭当地可谓家喻户晓，直到最近科学家才发现它竟然是一个新物种！
We already knew that shark species around the world have experienced dramatic declines in recent years, with some species down 97 percent or more.
正如我们所知，近年来全球鲨鱼种类正如预计的那样急剧减少，甚至某些种群数量的降幅达97％多。
Understanding how parasites leap species barriers is crucial to understanding how new infectious diseases start in humans—and an example of a recent leap was also published this week.
了解寄生虫是怎样跳种种障碍是了解传染性疾病是怎样在人类之间传播的关键所在——最近一个迁徙的例子也在这周公布了。
Darwin suggested a genealogical hypothesis: when species are relatively similar, it's because they are descended from a relatively recent common ancestor.
达尔文提出了系谱的假设：彼此较为相似的物种，它们来自同一个时期较近的祖先。
A recent report showed that, of the world's 634 primate species, 48% are classified as threatened with extinction on the International Union for the Conservation of Nature's "red list".
最近一份报告显示，世界634个灵长目动物物种中，48%面临灭绝的威胁，被自然保护者国际组织列为红色警告。
Over recent decades, many species of bacteria have been shown to be in constant communication with each other.
近几十年来，很多种细菌被发现彼此间存在着持续的交流。
Conservationists say the decline in grouse is due to bad moorland management: it started before bird-protection laws in 1954 and recent reintroductions of predator species.
环保主义者们说，松鸡数量的减少主要是因为对沼泽地的管理不善——这番说辞在1954年鸟类保护法出台前就已出现，近日重新引入肉食猛禽后仍是如此。
A 'plentiful supply' of food in the form of sand eels and other small fish seems to have contributed to successes for many species that have struggled to raise chicks in recent years.
“供应充足”的食物——玉筋鱼(sandeel)及其他小型鱼类——为那些近几年来一直难以养育小鸟的许多种海鸟的“鸟丁新旺”做出了“无私忘我的”贡献。
The Cephalotes atratus species of tree-nesting ant can perform directed aerial descent, according to a recent article in Integrative and Comparative Biology.
根据最近的一篇综合和比较生物学的文章发现，Cephalotesatratus种类的蚂蚁筑巢时能表演空中直线下降。
New species have been pouring out of the Cardamom region in recent years, because the mountains had been closed off to researchers until the 1990s.
豆蔻山脉长期封闭，直到20世纪90年代研究者才开始踏足，近些年该地区多有新物种被发现。
The recent capture of what could be North America's largest recorded blue catfish-in Virgina in late june-has us thinking about this oversized species and its relatives.
目前捕获的最长北美蓝鲶记录——去年6月在弗吉尼亚——让我们对这种超大型鱼类和它的近支产生了兴趣。
If this plan is submitted to the next CITES (convention on international trade in endangered species) meeting in Doha in March, it could undermine the goodwill that has built up in recent months.
在今年3月多哈举行的下一届CITES(《濒危野生动植物物种国际贸易公约》)会议上，如果这项计划得以提交，就会影响到近几个月来建立起的动物亲善关系。
The recent discovery of a new population of this elusive crab has led to its conservation status being reclassified from "critical" to "endangered" on the 2008 Red List of Threatened Species.
在这个难以捉摸的螃蟹，最近发现的新的人口，导致其保护状况正在从“危急”到“濒危”的2008年濒危物种红色名单重新分类。
For most species, this result can be explained by recent steppe expansion associated with a decrease of habitat heterogeneity.
对于大多数种类，这种结果可由最近草原扩大而来的生境异质性降低解释。
For most species, this result can be explained by recent steppe expansion associated with a decrease of habitat heterogeneity.
对于大多数种类，这种结果可由最近草原扩大而来的生境异质性降低解释。
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