Epauletted fruit bats prefer native plants and contribute to seed dispersal in a South African agricultural landscape

Abstract

Fruit bats provide vital ecosystem services through seed dispersal aiding secondary

forest regeneration. However, fruit bat species are often persecuted by fruit-growing

farmers due to perceived and actual crop damage. In this study, we investigated

the dietary components of Epomophorous wahlbergi, Epomophorous crypturus and

Rousettus aegyptiacus, which are the three fruit bat species commonly found in litchi

orchards and surrounding natural habitats in the Limpopo Province, South Africa. We

further explored the contribution of fruit bats to seed dispersal and germination success.

Fruit bat diet was dominated by wild fruit species (95%), while commercial fruit

contributed little (2%) to their diet, even during the litchi harvest season. Fig seeds

(Ficus spp.) collected from captured bats as spit outs had significantly lower germination

rates than regular seeds, but a significantly lower germination latency. A similar

pattern was observed for quinine trees (Rauvolfia caffra). Our results suggest that

fruit bats inhabiting orchards and surrounding natural vegetation feed primarily on

wild fruit trees, probably modulated by the high percentage of natural vegetation still

found in our study area, supporting the importance of natural habitats in mitigating

crop damage. We encourage further work on potential disservices by fruit bats and

their habitat use.

Keywords: agriculture, bat diet, habitat use, litchis, seed dispersal, seed germination