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Endozoochorous dispersal by herbivores and omnivores is mediated by germination conditions

Authors
  • Karimi, Sorour1
  • Hemami, Mahmoud-Reza1
  • Tarkesh Esfahani, Mostafa1
  • Baltzinger, Christophe2, 3
  • 1 Isfahan University of Technology, Isfahan, 84156-83111, Iran , Isfahan (Iran)
  • 2 Research Unit Forest Ecosystems, Domaine des Barres, Nogent-sur-Vernisson, 45290, France , Nogent-sur-Vernisson (France)
  • 3 School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, 3209, South Africa , Pietermaritzburg (South Africa)
Type
Published Article
Journal
BMC Ecology
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Aug 31, 2020
Volume
20
Issue
1
Identifiers
DOI: 10.1186/s12898-020-00317-3
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundVertebrate-mediated seed dispersal is probably the main long distance dispersal mode. Through endozoochory, large mammals act as mobile links between habitats within and among forest patches. Along with other factors, their feeding regimes do affect their contribution as dispersal vectors. We conducted a cross-species comparative experiment involving two herbivores, red deer and roe deer; and two opportunistic omnivores, wild boar and brown bear, all occurring in the forest and steppe-forest ecotone habitats of the south-eastern Caspian region. We compared their role as endozoochorous seed dispersal agents by monitoring seedling emergence in their dungs under greenhouse and natural conditions.ResultsIn total, 3078 seedlings, corresponding to 136 plant taxa sprouted from 445 paired dung sub-samples, under greenhouse and natural conditions. Only 336 seedlings, corresponding to 36 plant taxa, emerged under natural conditions, among which five taxa did not appear under greenhouse conditions. Graminoids and forbs composed 91% of the seedlings in the greenhouse whereas shrubs were more abundant under natural conditions, representing 55% of the emerged seedlings. Under greenhouse conditions, first red deer and then wild boar dispersed more species than the other two mammals, while under natural conditions brown bear was the most effective vector. We observed remarkably higher species richness and seedling abundance per dung sub-sample under buffered greenhouse conditions than we did under natural conditions.ConclusionsThe four sympatric mammals studied provided different seed dispersal services, both in terms of seedling abundance and species richness and may therefore be regarded as complementary. Our results highlight a positive bias when only considering germination under buffered greenhouse conditions. This must be taken into account when planning management options to benefit plant biodiversity based on the dispersal services concluded from greenhouse experiments.

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