The effects of learning, memory and behavior in Rattus

In rat (Rattus), the behavior of mother seems to affect the developmental behavior and endocrine physiology of her cub. Under harmful environmental stress, the brain and body will release signals and hormones to try to maintain the steady state of the body. A system that directly regulates stress and causes a maternal reaction indirectly is called the hypothalamic pituitary adrenal axis (HPA Axis). The hypothalamus controls the secretion of corticotropin releasing hormone (CRH), which promotes the release of ACTH from the anterior pituitary and stimulates the secretion of corticosteroids in the adrenal cortex, especially cortisol 1.

In Hawaii, various invertebrate and vertebrate species introduced introduced threaten the survival of native animals and plants. The rats introduced, Rattus exulans and Rattus rattus have a major adverse effect on native plants, birds, insects and molluscs. A small Indian catfish (Herpestes auwpunctatus) introduced introduces some endangered bird eggs and chicks (Stone and Anderson 1988). Wildlife damage management by USDA-APHIS-ADC, National Park Service, US Fish and Wildlife Service, and Hawaii State has made considerable progress in reducing the threat of introduced pests to Hawaii's unique animal and plant resources It was. I made progress. In another land situation Boiga's cheating almost eliminated Guam's traditional birds. The snake was introduced to Guam at the end of the Second World War.

The hypothesis about epidemiology - the emergence, expansion, and especially disappearance of plague from Europe - eventually the pools of rodents disease with fleas have been replaced by different species. Rattus rattus was originally brought from Asia to Europe through trade but later replaced with a big brown mouse (Rattus norvegicus) and succeeded in Europe. Because of the ecology of different rats, brown rats do not tend to spread bacteria with bacteria with humans with great death. Dynamic complexity of the rat ecosystem, population immunity of the reservoir, interaction with the human ecosystem, regardless of presence or absence of fleas secondary infection route between humans, immunity of each human population and their respective changes cause epidemics Explain possibly occurring, expanding and reappearing. It continued for centuries until unexplained disappearance