Article (Scientific journals)
High selfing rate, limited pollen dispersal and inbreeding depression in the emblematic African rain forest tree Baillonella toxisperma - Management implications
Duminil, Jérôme; Mendene Abessolo, D. T.; Ndiade Bourobou, D. et al.
2016In Forest Ecology and Management, 379, p. 20-29
Peer Reviewed verified by ORBi
 

Files


Full Text
Duminil_FEM-2016.pdf
Publisher postprint (683.83 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Inbreeding; Gene flow; Logging; Selfing; Spatial genetic structure; Timber species
Abstract :
[en] Mating system and gene flow are major influencing factors of species population dynamics and evolution. These factors are often not characterized in tropical tree species, yet they constitute basic information that must be considered to implement sustainable management practices. In particular, as logging implies a reduction of the density of congeneric mates, the connectivity through pollination between individuals has to be well characterized (selfing versus outcrossing rates, distances between mates). We conducted a genetic-based analysis (using 10 nuclear microsatellites) to determine the mating system and gene flow characteristics of an emblematic timber tree species from lowland rain forests of the Congo Basin, Baillonella toxisperma (Sapotaceae). The species, which is frequently exploited for its wood and for a number of non-timber forest products, naturally occurs at low densities (ca. 0.01–0.1 individuals/ha). It is supposedly an entomophilous species whose seeds are probably dispersed by mammals. We have shown that the species presents a mixed-mating system (about 20–40% of selfing depending on analysis method). However, the comparison of inbreeding parameters among cohorts suggests that inbred individuals die between seedling and mature tree stages. The mean pollen dispersal distance was relatively low for such a low-density population species (estimated to be 690 or 777 m depending on analysis method) and, together with a low mean number of pollen donors (NEP = 2.76), it suggests a pattern of nearest-neighbour mating where allo-pollen could be a limiting factor. However, B. toxisperma presents a relatively weak genetic structure (Sp statistic = 0.0095) indicative of long gene dispersal distance (rg = 3–5 km according to the assumed effective population density). Overall, this would indicate that gene flow occurs mainly by extensive seed dispersal in this species. These results suggest that mammals and local populations involved in the dispersal of the species play a key role by lowering biparental inbreeding effects. Sustainable population management might require assisted regeneration using unrelated planting material.
Disciplines :
Environmental sciences & ecology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Duminil, Jérôme
Mendene Abessolo, D. T.
Ndiade Bourobou, D.
Doucet, Jean-Louis ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales
Loo, J.
Hardy, Olivier J.
Language :
English
Title :
High selfing rate, limited pollen dispersal and inbreeding depression in the emblematic African rain forest tree Baillonella toxisperma - Management implications
Publication date :
August 2016
Journal title :
Forest Ecology and Management
ISSN :
0378-1127
eISSN :
1872-7042
Publisher :
Elsevier Science
Volume :
379
Pages :
20-29
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 September 2016

Statistics


Number of views
77 (14 by ULiège)
Number of downloads
204 (8 by ULiège)

Scopus citations®
 
23
Scopus citations®
without self-citations
17
OpenCitations
 
21

Bibliography


Similar publications



Contact ORBi