Mac Donald Et Al. (1995) Conclude That, Vegetation Around Beaver Ponds Can

Mac Donald et al. (1995) conclude that, vegetation around beaver ponds can benefit native herbivores such as water voles (Arvicola terrestris); and that; habitat management required for the reintroduction of this species may benefit the wildlife of an area.
Adverse Ecological Impacts
Kenward (1979) claims that, Possible ecological threats include damage to resident populations of prey species through the reintroduction of a predator such as the white-tailed sea eagle. This is hard to predict but studies of the effect of goshawks on wood pigeon (Columba palumbus) populations in Europe showed that the return of this predator to the UK would be unlikely to have a marked effect on wood pigeons. Lever (1994) adds that, reintroduction of the beaver to the UK might impede migration of Atlantic salmon (Salmo salar). Halley (1995) explains that, Experience from Europe, however, suggests that the effects of beavers on salmon are likely to be slight as dams are rarely sited on the fast flowing areas used by salmon for spawning. Norwegian salmon fisheries are not adversely affected by beaver populations that have increased dramatically since 1900.
Below are other potentially relevant references, which were not included in the preliminary review:
The work of Jungius (1985) explores on the prospects for reintroduction. While he discusses the benefits of species reintroduction, he also regards it as one of the many, and certainly not the most important means of supporting the conservation of the species, since there lot of factors to be considered carefully before opting to embark on such a program. He maintains that a reintroduction program has a good chance of success if scientifically planned in cooperation with the responsible political institution and the local people concerned; and that the reasons of the species' disappearance have to be identified and removed, and the most suitable area for reintroduction selected. Payton, et al. (2002) discuss the concept of keystone species and its relevance in processes that directly (e.g. predation, competition) rather than indirectly (e.g. nutrient cycling) control biodiversity and which is the process that may allow managers to combine the best features paradigms.
Conclusion:
There is a wealth of information available regarding the following topics: biodiversity conservation, biodiversity loss and approaches used for species protection. However, there seems to be dearth of information regarding specific reintroduction programs of extinct species in Britain, especially on evaluation and assessment of such programmes.