• Aucun résultat trouvé

Assessment of fine scale population genetic diversity and regeneration in Congo basin logged forests

N/A
N/A
Protected

Academic year: 2021

Partager "Assessment of fine scale population genetic diversity and regeneration in Congo basin logged forests"

Copied!
1
0
0

Texte intégral

(1)

TERRA-FAC (University of Liège – Gembloux Agro-Bio Tech), Pallisco (Cameroon), PPECF

Photos & figures: Q Evrard, JY Devleeschouwer & P Jeanmart

The data acquired in this ongoing project will strengthen the application of sustainable forest management and certification practices by adjusting harvesting norms through the use of scientifically-relevant data. In particular, we will tentatively define a maximum distance to be maintained between two adults to allow a qualitative reproduction (limiting inbreeding).

ATBC Annual Meeting 2016 France – Reconciling conservation and sustainable use of biodiversity

Assessment of fine scale population

genetic diversity and regeneration

in Congo basin logged forests

Q. Evrard

1

, K. Daïnou

2

, O. Hardy

3

, J. Duminil

3,4

, P. Lagoute

5

, C. Bracke

2

, J.-L. Doucet

1

1Tropical Forestry, Management of Forest Resources, TERRA & BIOSE, Gembloux Agro-Bio Tech, ULg. 2Nature+ asbl, Tropical Forestry, TERRA & Biose , Gembloux Agro-Bio Tech, ULg.

3Service Evolution Biologique et Ecologie, CP160/12, Faculté des Sciences, ULB. 4Bioversity International, Genetic Resources and Crop Evolution, Maccarese, Italy. 5Pallisco SARL, Douala, Cameroon.

Dispersal agents were identified by direct

observations and camera traps underneath P. elata and

M. excelsa adult trees (Results for these latest

species in Table 1). Seedrain was obtained by installing

quadrats underneath the parent trees.

There is a clear lack of knowledge on the reproductive biology and the mechanisms of regeneration of the Congo Basin timber species, whereas sustainable management and certification policies require such informations. In this ongoing research, we integrate ecological and genetic approaches to characterize the reproductive and regeneration patterns of a set of priority timber species: Afzelia bipindensis, Baillonella toxisperma, Entandrophragma angolense, E. candollei, E. cylindricum, E. utile, Erythrophleum suaveolens, Milicia excelsa, Pericopsis elata and Terminalia superba.

Seed germination rate was characterized in nursery for P. elata (see picture for seedlings) trees

sampled on a gradient of spatial isolation, and for 10

M. excelsa female trees.

Final goal:

Characterization of pollen and seed dispersal

distances and agents and mating system for

each focal species. Direct approach. We established

two 400-ha plots where all adults and seedlings of the target species

were mapped and genetically

sampled . Lots of seeds also were collected from a subsample of

mother trees.

Genetics. Samples are currently being genotyped using specific

nuclear microsatellites (Fig. 2).

Indirect approach. We collected samples of leaf or

cambium from 62 adults of

M. excelsa within a 10 km-radius area and collected seeds produced by each female tree to assess seed

germination rate Isolation gradient. On the basis of

tree inventory made by the FSC-labelled company Pallisco, we selected 3 zones where the target

species vary in abundance.

Fig. 1. One 400 ha plot with focal trees mapped (349 B.

toxisperma, 66 A. bipindensis, 49 M. excelsa, 32 E. utile, 31 E. angolense)

Fig. 2. An example of alleles reading graph produced by the

software Peak Scanner for a sample of B. toxisperma.

Density of adults Seed germination rate (%) Cause death (%)

Larvae Rotten Aborted Gnawed High 55.18 40.88 34.16 22.27 2.71 Intermediate 68.69 25.41 29.31 25.41 19.87

Table 2. First main results from the germination test and

the seeds categories for P. elata seeds.

Detected animal Relative

contribution (%)

Cricetomys emini 31

Undetermined Muridae 38

Epixerus wilsoni 13

Others 18

Table 1. Relative contribution of the

main consumer of M. excelsa fruits.

Acknowledgements

Me

thods

Pr

eliminar

y

results

Références

Documents relatifs

Dans ce mémoire, nous avons donc réalisé un inventaire des incohérences foncières du domaine public routier du Département de l’Oise et établi des processus de

Abstract: We establish the equation of motion of pseudoscalar particles coupled to an electro- magnetic field in a classical gravitational background through the use of conformal

Ce qui fonde le coaching, c’est principalement le type de relation entre le coach et le coaché, qu’il s’agisse d’un individu ou d’un groupe dans un contexte donné..

Three hours (6 hours for hypertransfused animals) after radio- iron injection, rats were exsanguinated from the abdominal aorta and perfused with 20–-30 mL of saline. The spleen,

tent, comme on a eu l’occasion de le constater. On pourrait croire que la désodorisation pure et simple de tous les espaces, urbains, sociaux, intimes, constitue la réponse la

Communication analogique plus complexe et résolution de problèmes Utilisation de symboles pour exprimer des pensées et des sentiments Relie logiquement des symboles et des

Ainsi, l’utilisation de l’ocytocine pendant le travail semble de plus en plus banalisée dans le cadre de la direction active du travail, alors que cette molécule est classée

Both combine a Kalman filter, which provides accurate estimation of the health condition for long-time-scale deterioration (such as engine wear), and an adaptive component