How complementary are large frugivores for tree seedling recruitment? A case study in the Congo Basin

Complementing functions; Congo Basin; defaunation; Moran's eigenvector maps (MEM); regeneration; seed dispersal; spatial autocorrelation; tropical forest; variation partitioning

Abstract :

[en] Large frugivores provide critical seed dispersal services for many plant species and their extirpation from forested ecosystems can cause compositional shifts in regenerating plant cohorts. Yet, we still poorly understand whether large seed-dispersers have complementary or redundant roles for forest regeneration. Here, to assess the functional complementarity of large-bodied frugivores in forest regeneration, we quantified the effects of varying abundance of hornbills, primates and the forest elephant on the density, species richness and the mean weighted seed length of animal-dispersed tree species among seedlings in five sites in a forest-savanna mosaic in D. R. Congo, while accounting for percentage forest cover and the local presence of fruiting trees. We found that the abundance of primates was positively associated with species richness of seedlings, while percentage forest cover was negatively associated (R 2 = 0.19). The abundance of hornbills, the presence of elephants and percentage forest cover were positively associated with mean seed length of the regenerating cohort (R 2 = 0.13). Spatially explicit analysis indicated that some additional processes have an important influence on these response indices. Primates would seem to have a preponderant role for maintaining relatively high species richness, while hornbills and elephant would seem to be predominantly responsible for the recruitment of large-seeded trees. Our results could indicate that these taxa of frugivores play complementary functional roles for forest regeneration. This suggests that the extirpation of one or more of these dispersers would likely not be functionally compensated for by the remaining taxa, hence possibly cascading into compositional shifts. © Cambridge University Press 2019.

Disciplines :

Environmental sciences & ecology

Author, co-author :

Trolliet, Franck ; Unité de Biologie du Comportement, UR SPHERES, Université de Liège, Quai van Beneden 22, Liège, 4020, Belgium

Bauman, D.; Laboratoire d'Ecologie Végétale et Biogéochimie, Université Libre de Bruxelles, 50 av. F. D. Roosevelt, CP 244, Brussels, 1050, Belgium

Forget, P.-M.; UMR 7179 MECADEV CNRS-MNHN, Muséum National d'Histoire Naturelle, Département Adaptations du Vivant, Brunoy, France

Doucet, Jean-Louis ; Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Laboratoire de Foresterie des régions trop. et subtropicales

Gillet, J.-F.; Nature Forest Environment (Freelance in Tropical Forestry), Belgium

Hambuckers, Alain ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale

Language :

English

Title :

How complementary are large frugivores for tree seedling recruitment? A case study in the Congo Basin

Publication date :

2019

Journal title :

Journal of Tropical Ecology

Volume :

in press

Peer reviewed :

Peer reviewed

Additional URL :

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068847396&doi=10.1017%2fS026646741900018X&partnerID=40&md5=6da8c1eb44547a5e2df502e3716e7cd0

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]

Available on ORBi :

since 26 August 2019

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