Species can disappear from the basin and new species can appear.
某些物种会从流域消失，新的物种会出现。
They can venture deep into the woods to discover new surprises, including dangerous and wondrous herbs, and new species of insects.
他们可以深入到树林中冒险，惊喜连连，包括危险奇异的草药还有昆虫新种。
In Part II, detailed descriptions for new genus and new species are given, with related figs and photos. Keys to the genera and species of Northeastern China are also provided.
第二部分分类，重点详细描述了新属、新种以及新记录属和种，并附有相应的显微照片，同时对东北地区已知属和种编制了分属、分种检索表。
I know of scientists who conduct marine life surveys and identify new species every time they go out on a dive.
我知道有科学家在从事海洋生物调查，并在每次潜水时都能发现新的物种。
The new study found that 70 percent of rodent and primate groups have species with an appendix.
这项新的研究发现，70%的啮齿动物和灵长类动物的物种具有阑尾。
Future research should look at the behavior and ecology of these worms, to understand what caused the new species to arise.
未来的研究应该看看这些蠕虫的行为与生态学，以了解新物种的出现是由什么造成的。
Future research should look at the behavior and ecology of these worms to understand what caused the emergence of new species.
未来的研究应该看看这些蠕虫的行为与生态学，以了解新物种的出现是由什么造成的。
Commenting on the find, snake expert Robert Henderson, from the Milwaukee Museum of Natural History, said, "Worldwide, new species of frogs are being discovered and described quite regularly."
密尔沃基自然历史博物馆的蛇类专家罗伯特·亨德森对这个发现评价称：“在世界范围内，人们经常会发现和描述新种类的青蛙。”
The emphasis of this new "community ecology" was on the composition and structure of communities consisting of different species.
这种新的“群落生态学”强调的是由不同物种组成的群落的组成和结构。
Snake expert Robert Henderson, from the Milwaukee Museum of Natural History, said, "Worldwide, new species of frogs are being discovered and described quite regularly."
密尔沃基自然历史博物馆的蛇类专家罗伯特·亨德森说：“在世界范围内，人们经常发现和描述新的青蛙种类。”
Ragwort was accidentally introduced to New Zealand in the late nineteenth century and, like so many invading foreign species, quickly became a pest.
19世纪末，狗舌草被偶然引入新西兰，像许多入侵的外来物种一样，它很快就变成了一种有害生物。
In most localities a given species of clam or coral persists essentially unchanged throughout a thick formation of rock, only to be replaced suddenly by a new and different species.
在大多数地方，某一种蛤蜊或珊瑚在厚厚的岩层中保持基本不变，只是突然被一个新的不同的物种所取代。
Even if the new population is of a different species, it can approximately fill the niche vacated by the extinct population and keep the food web intact.
即使新的种群属于不同物种，它也可以大致填补已灭绝种群空出的生态位，保持食物网的完整。
Gene flow, the movement of alleles across the range of the species, is relatively free because individuals can move and then mate with individuals in their new location.
基因流动，即等位基因在整个物种范围内的移动，是相对自由的，因为个体可以移动，然后在新的地点与个体交配。
I began collecting newspaper articles about new species, new monkey, new spider..., and on and on they appear.
我开始收集报纸上关于新物种、新型猴子、新型蜘蛛的文章，它们不断出现。
Only those species with ways of spreading to these islands were able to undertake the long journeys, and the various factors at play resulted in diverse combinations of new colonists on the islands.
只有那些有办法传播到这些岛屿的物种才能进行长途旅行，各种因素在起作用，导致岛上新殖民者的多样化组合。
"Only a small percentage of alien species cause problems in their new habitats," said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.
田纳西大学生态学和进化生物学教授唐·史密斯说：“只有一小部分外来物种会在新栖息地引发问题。”
"Only a small percentage of alien species cause problems in their new habitats,'' said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.
“只有一小部分外来物种会在它们的新栖息地引发问题。”田纳西大学生态学和进化生物学教授唐·史密斯说。
Obviously, conservationists need to think about saving species in a completely new way by preserving animal traditions as well as bodies and genes.
显然，自然资源保护主义者需要想出一种全新的方式来拯救物种，在保护动物及其基因的同时，也要保护其传统。
This was described by Darwin for indigenous New Zealand species of animals and plants, which died out when competing species from Europe were introduced.
这是达尔文为新西兰本土动植物物种所描述的，它们在来自欧洲竞争物种被引进时灭绝了。
There are over 3,000 known species of these colorful sea slug relatives and new ones are discovered nearly every day.
已知的彩色海参类动物超过了3000多种，而且几乎每一天就可以发现一些新品种。
And after several generations, you'd have a new species, "he said."
“而且经过几代之后，就会形成一个新物种了，”他说。
Researchers only realised that the breed living on the islands of Borneo and Sumatra was a new species - distinct from clouded leopards living elsewhere in Asia - in 2007.
到2007年研究人员才发现生活在婆罗洲和苏门答腊岛的云豹是一个新的物种，与亚洲其他地方的云豹明显不同。
However even in New Zealand the species are threatened and difficult to catch.
然而即使在新西兰，这个物种也因受到威胁而难以捕获。
They also found a fourth possible new species and other corals that were thought not to inhabit the waters around the Galapagos.
他们还发现了第四个可能的新物种，以及其他一些被认为不在加拉帕戈斯群岛附近海域生长的珊瑚。
Darwin's theory explained why species were so well adapted to their environment and how new species would form.
达尔文的学说解释了物种为什么对他们的环境适应得如此之好，也分析了新物种是如何形成的。
“We go back to a site dozens of times and find new species routinely,” says marine biologist Cindy Lee Van Dover of Duke University.
杜克大学的海洋生物学家辛迪李说：“我们对一个地点进行多次勘测，每次都会发现新的物种。”
His encounters with lions, baboons and many other species alien to the New World were a familiar and acceptable genre.
他遇见了狮子，狒狒和许多其它奇异的物种，而对新大陆来说，却稀松平常。
His encounters with lions, baboons and many other species alien to the New World were a familiar and acceptable genre.
他遇见了狮子，狒狒和许多其它奇异的物种，而对新大陆来说，却稀松平常。
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