Oral Paper

         Pteridology

Dispersal of ferns by mountain gorillas (Gorilla beringei beringei)

Presenting Author
Melanie DeVore
Description
Biogeographical analyses and the establishment of homosporous fern populations have overwhelmingly been based on assuming spores are dispersed by wind and water. We rarely assess if, besides spores, whether sporangia and actual fronds (complete or fragmental) serve as dispersal units. However, recent studies indicate epi- and endozoochory are also important dispersal modes. Fern epizoochory was documented during a more comprehensive study of the role of epizoochory in dispersal of mountain gorilla (Gorilla beringei beringei) food plants in Volcanoes National Park, Rwanda. Field data were collected using focal sampling method for age classes of gorillas including immature, sub-adult, and adult individuals.  Video footage obtained permitted the documentation of plant parts attached on six gorilla body parts including back head, legs, arms, shoulders and front part/stomach. Climbing and playing by juveniles was associated with the adhesion of frond fragments of epiphytes to the gorilla body.  All age classes, during feeding activities, had frond fragments of terrestrial taxa become attached to their body. It is apparent that besides wind dispersal and previously documented endozoochorous dispersal, epizoochory also likely plays a role in fern dispersal. These results also indicate that spores, sporangia and even entire frond segments can potentially serve as diaspores for ferns. Clearly, the ecological role of mammals as dispersal agents, including the viability of spores after transport, needs to be evaluated in future studies.