Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Norvege → Behavioural and demographic changes in impala (Aepyceros melampus) populations after a decade of changed conservation management – a case study in the Serengeti Ecosystem, Tanzania

Norwegian University of Science and Technology (NTNU) 2019

Behavioural and demographic changes in impala (Aepyceros melampus) populations after a decade of changed conservation management – a case study in the Serengeti Ecosystem, Tanzania

Flølo, Linn Marie

Titre : Behavioural and demographic changes in impala (Aepyceros melampus) populations after a decade of changed conservation management – a case study in the Serengeti Ecosystem, Tanzania

Auteur : Flølo, Linn Marie

Université de soutenance : Norwegian University of Science and Technology (NTNU)

Grade : Master’s thesis in Biology 2019

Résumé
In the western Serengeti Ecosystem, significant investment has been made in the conservation and management of the Grumeti area since the early 21st century. By using impala (Aepyceros melampus) as a study species, we investigated whether these investments have had quantifiable impacts on wildlife populations in the area by comparing the partially protected areas (PPAs) Grumeti and Ikorongo Game Reserves and Ikona Wildlife Management Area, with the adjacent strictly protected Serengeti National Park. Transects were driven along roads during 2003 and 2018 ; impalas’ flight initiation distance was tested and their density, sex ratio, group size and behaviour recorded. When contrasting the two periods, results showed that impala density and group sizes increased significantly, and the behaviour of impala was less flighty, in the PPAs. Sex ratios had become more female-skewed. The positive changes for impala are likely attributable to effective conservation management, particularly in the PPAs, which formerly experienced high levels of illegal hunting activities. A shift to more female-skewed sex ratios was unexpected and the main reason for this is unknown.

Présentation

Version intégrale (17,4 Mb)

Page publiée le 25 mars 2020