Discriminating migrations

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Step-by-Step Migrations

This paper considers a dynamic model of industry location in which there is a tension between two forces. First, there is the agglomerating force of preference of intermediate input variety that tends to keep an industry at its original location. Second, other location factors matter and these tend to pull the industry in the direction of a new location. A crucial aspect of the model is that th...

متن کامل

Guiding neuronal cell migrations.

Neuronal migration is, along with axon guidance, one of the fundamental mechanisms underlying the wiring of the brain. As other organs, the nervous system has acquired the ability to grow both in size and complexity by using migration as a strategy to position cell types from different origins into specific coordinates, allowing for the generation of brain circuitries. Guidance of migrating neu...

متن کامل

Mutations or Migrations

We study the ABC model in the cyclic competition (A+B → 2B, B+C → 2C, C+A → 2A) and the neutral drift (A+B → 2B or 2A, B+C → 2C or 2B, C+A → 2A or 2C) versions, with mutations and migrations introduced into the model. When stochastic phenomena are taken into account, there are three distinct regimes in the model. (i) In the “fixation” regime, the first extinction time scales with the system siz...

متن کامل

Sea Turtle Migrations

Sea turtles are slow-maturing animals that are known to make long transoceanic migrations, even returning back to their natal beaches. However, until very recently, the only knowledge of these journeys was available through the tracking of flipper tags when mature females ventured onto land to nest. Conservation organizations and governments have been monitoring these species for a number of ye...

متن کامل

The genetics of human migrations

W hen our human ancestors began to migrate from the African savannahs across the Alps into Northern Europe and Asia between 200,000 and 60,000 years ago, they encountered a colder climate, different food sources and new predators. Inevitably, evolution began to work on those wandering tribes: their skin became lighter, their metabolism adapted to new food sources, and their immune system had to...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Nature

سال: 1999

ISSN: 0028-0836,1476-4687

DOI: 10.1038/22427