搜索结果: 61-75 共查到“国际动态 动物学其他学科”相关记录193条 . 查询时间(1.402 秒)
性选择驱动果蝇产生巨型精子
性选择驱动 果蝇 巨型精子
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2016/6/2
英国《自然》杂志近日发表的一篇演化学论文，描述了驱动雄性果蝇产生数量很少的巨大精子的演化过程，其精子长度可以超过5厘米。在动物界，雌雄两性中为了交配需要进行更猛烈竞争的一方（通常为雄性），会演化出更为精美的装饰，例如鹿角、牛角和动物的尾羽等，以便来获取交配对象。雄性果蝇的精子出乎意料的大，是地球上最长的精子细胞之一，尤其是和它们相对细小的身躯相比，精子伸直后甚至可以是其身长的20倍，这被认为是性装...
猫鼬会根据环境调节体格和生长速度
猫鼬 环境 调节体格 生长速度
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2016/5/26
英国剑桥大学的一项研究发现，野生猫鼬会调整自己的生长速度和食物摄入量，以此在繁殖竞争中获取优势。相关论文发表在最新一期《自然》杂志上。此前就有研究发现，动物的年龄和体重与其社会地位有着密切关系。科学家还发现，在好几种脊椎动物和哺乳动物中，生长速度会随着社会环境变化而改变。但以前并不清楚个体动物是否会为战胜竞争对手提升自己的生长速度。
How is rattlesnake venom like fine wine?Both have regional varieties
rattlesnake venom fine wine regional varieties
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2016/5/31
If you’re a rattlesnake, you want to bring the right weapon to a squirrel fight.And that venomous weapon varies from place to place, evolutionarily calibrated to overpower the local squirrels’ defense...
Earth's weird and wonderful animal models
Earth's weird animal models
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2016/4/25
In the scientific world, Drosophila is anything but humble; instead, it serves as a model organism of powerhouse proportions. For over a century, scientists have usedDrosophila to revea...
Scientists crack secrets of the monarch butterfly’s internal compass
Scientists monarch butterfly internal compass
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2016/4/25
ach fall, monarch butterflies across Canada and the United States turn their orange, black and white-mottled wings toward the Rio Grande and migrate over 2,000 miles to the relative warmth of cen...
Why Bearcats Smell Like Buttered Popcorn
Bearcats Buttered Popcorn
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2016/4/25
The bearcat. The binturong. Whatever you call this shy, shaggy-haired creature from Southeast Asia, many people who have met one notice the same thing: it smells like a movie theater snack bar.M...
Sea slug brain chemistry reveals a lot about human memory,learning
Sea slug brain chemistry human memory learning
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2016/4/13
As you can imagine, life is not very complicated for sea slugs. They use their brains mainly to find food, avoid becoming food and to reproduce. While the human brain and nervous system are wired with...
ASU studies are first time an anticipatory mechanism has been found in social organisms
ASU anticipatory mechanism social organisms
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2016/4/13
Keeping honeybees healthy is critical to the world’s food supply.A lack of adequate nutrition for bees is blamed as one of many possible causes for colony collapse disorder — a mysterious syndrome tha...
Rare beluga data show whales dive to maximize meals
beluga data show whales dive maximize meals
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2016/2/23
Children’s singer and songwriter Raffi may have brought beluga whales into popular culture with his 1980 song “Baby Beluga,” but surprisingly little is actually known about the life and ecology of the...
Hooked on a feeling:new study finds fish fins can sense touch
fish fins sense touch
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2016/2/23
Lightly brush your fingertips across your keyboard. What do you feel? The smoothness of plastic? Ridges, gaps, maybe a sticky key? Bumps on the F and J keys? The human fingertip is a finely tuned sens...
Feeding birds in your local park?If they're white ibises in Florida,think twice
Feeding birds local park ibises Florida
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2016/2/23
The following is part 17 in a series on the NSF-NIH-USDA Ecology and Evolution of Infectious Diseases (EEID) Program. See parts: one, two, three, four, five, six, se...
Do bigger brains make smarter carnivores?
smarter carnivores
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2016/2/22
Why do dolphins evolve large brains relative to the size of their bodies, while blue whales and hippos have brains that are relatively small?While there has been much speculation regarding brain size ...
New finding shows that males can drive creation of new species
males drive creation new species
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2016/2/22
Evolutionary biologists often debate on whether sexual selection can lead to new species. Most studies have focused on natural selection or, for the few studies that considered sexual selection, on ho...
What a moth's nose knows
moth's nose
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2016/2/22
Moths sniff out others of their own species using specific pheromone blends. So if you transplant an antenna – the nose, essentially – from one species to another, which blend of pheromones does the m...
Study Shows Animals with Larger Brains are Best Problem Solvers
Animals Larger Brains Best Problem Solvers
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2016/2/22
Why did some species, such as humans and dolphins, evolve large brains relative to the size of their bodies? Why did others, such as blue whales and hippos, evolve to have brains that, compared to the...