Tarangire revisited: Consequences of declining connectivity in a tropical ungulate population

Biological Conservation
Thomas Morrison; William D Newmark; Charles A Foley; Douglas T Bolger
By: , and 



The hyper-abundance of migratory wildlife in many ecosystems depends on maintaining access to seasonally available resources. In Eastern and Southern Africa, land-use change and a loss of connectivity have coincided with widespread declines in the abundance and geographic range of ungulate populations. Using photographic capture-mark-recapture, we examine the historical pattern of loss of connectivity and its impact on population trends in a partially migratory wildebeest population in northern Tanzania. To estimate abundance, we use a novel modeling approach that overcomes bias associated with photo misidentifications. Our data indicate (1) diminished connectivity within and between seasonal areas as a result of human activities, (2) a reduction in the overall population size compared to historical numbers, with high variability over time, (3) the continued use of highly constrained movement corridors between the three main seasonal ranges, (4) higher recruitment in the non-migratory subpopulation (Lake Manyara National Park) than in other areas of the ecosystem, and (5) an increase in the relative abundance of resident to migrant wildebeest. Recent conservation efforts to protect seasonal habitat and to enforce anti-poaching policies outside protected areas have likely helped stabilize the population, at least temporarily, but we caution that several key vulnerabilities remain.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Tarangire revisited: Consequences of declining connectivity in a tropical ungulate population
Series title Biological Conservation
DOI 10.1016/j.biocon.2016.02.034
Volume 197
Year Published 2016
Language English
Publisher Elsevier
Publisher location Kidlington, Oxford
Contributing office(s) Patuxent Wildlife Research Center
Description 8 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Biological Conservation
First page 53
Last page 60
Country Tanzania
Other Geospatial Tarangire-Manyara Ecosystem
Online Only (Y/N) N
Additional Online Files (Y/N) N
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