Population‐level assessment of genetic diversity and habitat fragmentation in critically endangered Grauer's gorillas

Pauline Baas, Tom van der Valk, Linda Vigilant, Urbain Ngobobo, Escobar Binyinyi, Radar Nishuli, Damien Caillaud, Katerina Guschanski

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives
The critically endangered Grauer's gorilla (Gorilla beringei graueri) has experienced an estimated 77% population decline within a single generation. Although crucial for informed conservation decisions, there is no clear understanding about population structure and distribution of genetic diversity across the species' highly fragmented range. We fill this gap by studying several core and peripheral Grauer's gorilla populations throughout their distribution range.

Materials and Methods
We generated genetic profiles for a sampling of an unstudied population of Grauer's gorillas from within the species' core range at 13 autosomal microsatellite loci and combined them with previously published and newly generated data from four other Grauer's gorilla populations, two mountain gorilla populations, and one western lowland gorilla population.

Results
In agreement with previous studies, the genetic diversity of Grauer's gorillas is intermediate, falling between western lowland and mountain gorillas. Among Grauer's gorilla populations, we observe lower genetic diversity and high differentiation in peripheral compared with central populations, indicating a strong effect of genetic drift and limited gene flow among small, isolated forest fragments.

Discussion
Although genetically less diverse, peripheral populations are frequently essential for the long-term persistence of a species and migration between peripheral and core populations may significantly enrich the overall species genetic diversity. Thus, in addition to central Grauer's gorilla populations from the core of the distribution range that clearly deserve conservation attention, we argue that conservation strategies aiming to ensure long-term species viability should include preserving peripheral populations and enhancing habitat connectivity.
Original languageEnglish
Pages (from-to)565-575
Number of pages11
JournalAmerican Journal of Physical Anthropology
Volume165
Issue number3
Early online date4 Jan 2018
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • eastern Democratic Republic of Congo
  • feces
  • microsatellites
  • noninvasive samples
  • population structure

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