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Seed nutrient content rather than size influences seed dispersal by scatterhoarding rodents in a West African montane forest

Published online by Cambridge University Press:  14 August 2020

Biplang G. Yadok ,
Pierre-Michel Forget ,
Daniel Gerhard ,
Babale Aliyu  and
Hazel Chapman
Biplang G. Yadok*
Affiliation:
School of Biological Sciences, University of Canterbury, PB 4800, Christchurch, New Zealand Nigerian Montane Forest Project, Yelwa village, Taraba State, Nigeria
Pierre-Michel Forget
Affiliation:
Muséum National d’Histoire Naturelle, UMR 7179 MECADEV CNRS-MNHN, 1 avenue du Petit Château, 91800Brunoy, France
Daniel Gerhard
Affiliation:
Department of Mathematics and Statistics, University of Canterbury, PB 4800, Christchurch, New Zealand
Babale Aliyu
Affiliation:
Nigerian Montane Forest Project, Yelwa village, Taraba State, Nigeria Department of Biological Sciences, Gombe State University, Tudun Wada Street, Gombe, Gombe State, Nigeria
Hazel Chapman
Affiliation:
School of Biological Sciences, University of Canterbury, PB 4800, Christchurch, New Zealand Nigerian Montane Forest Project, Yelwa village, Taraba State, Nigeria
*
Author for correspondence: *Biplang G. Yadok, Email: [email protected]
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Abstract

Rodents can be important in seed dispersal through their scatterhoarding behaviour, yet, the seed traits that are most influential in seed removal by Afrotropical scatterhoarding rodents remains unclear. Here, we investigated the effect of seed size and nutrient content of four seed species on the scatterhoarding behaviour of rodents in an Afromontane forest, Ngel Nyaki forest, Nigeria. To do this we marked with thread-tags the seeds of Santiria trimera, Beilschmedia mannii, Carapa oreophila and Anthonotha noldeae and observed their fate. We predicted that (1) caching frequency would be higher for larger than smaller seed species; (2) caching frequency would be higher for nutrient-rich than nutrient-poor seeds; (3) larger seeds would be taken across farther distances; and (4) survival of cached seeds would be higher for nutrient-rich seeds. In contrast to studies elsewhere we found no difference in caching probabilities based on seed size, although nutrient-rich (high fat content) seeds had a higher probability of being predated than seeds with lower fat content. Larger and smaller seeds were dispersed over the same distances and nutrient-poor (high fibre content) seeds survived longer in seed caches. Overall, our findings suggest that large, nutrient-rich seed species are less likely to be dispersed by rodents.

Keywords

AfrotropicsAtherurus africanusCricetomys sp. nov.nutrient contentscatterhoarding rodentsseed size
Type
Research Article
Information
Journal of Tropical Ecology , Volume 36 , Issue 4 , July 2020 , pp. 174 - 181
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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