Straw-coloured fruit bats exist throughout most of the African continent. This large fruit bat is one of, if not the most numerous fruit-eating animal (called frugivores) in Africa. They live in colonies of thousands to millions of individuals.
Fruit bats sleep during the day, hanging upside down in the crowns of old trees, and become active at sunset when they set off in search of food – specifically nectar and fruit.
With their wingspan of up to 80cm, they are able to cover vast distances. When the colonies are very large and competition for food is stiff, they can fly up to 95km to suitable food trees and only return to their roosts the following morning. They defecate the seeds of the fruit they eat over an unusually long time period, even during flight. They can thus disperse seeds across huge areas as they go.
The seeds transported in this way can end up far from the parent plant, and in areas that are good for germination and establishment. The fact that these gigantic colonies seasonally migrate across Africa, following the rain and upcoming fruit, help disperse seeds of seasonal fruit and in places with only a few local frugivores.
The fruit bats therefore contribute to the species and genetic diversity of forests.
In 2019 we investigated the potential of these fruit bat colonies to reforest areas where trees had been lost in parts of Africa.
We tracked the movements of fruit bats in Ghana, Burkina Faso and Zambia by deploying them with small GPS loggers, which allowed us to follow their nightly movements to food trees. We also looked into how long they held food in their gut. We then applied our findings to entire colonies to see what services they provided in large numbers.
We found that, in a conservative estimate, a colony of 150,000 animals could disseminate more than 300,000 small seeds in a single night, and that a single colony of fruit bats could kickstart the regrowth of 800 hectares of forest.
Fruit bats: the winged 'conservationists' reforesting parts of Africa
Fruit bats sleep during the day, hanging upside down in the crowns of old trees, and become active at sunset when they set off in search of food – specifically nectar and fruit.
With their wingspan of up to 80cm, they are able to cover vast distances. When the colonies are very large and competition for food is stiff, they can fly up to 95km to suitable food trees and only return to their roosts the following morning. They defecate the seeds of the fruit they eat over an unusually long time period, even during flight. They can thus disperse seeds across huge areas as they go.
The seeds transported in this way can end up far from the parent plant, and in areas that are good for germination and establishment. The fact that these gigantic colonies seasonally migrate across Africa, following the rain and upcoming fruit, help disperse seeds of seasonal fruit and in places with only a few local frugivores.
The fruit bats therefore contribute to the species and genetic diversity of forests.
In 2019 we investigated the potential of these fruit bat colonies to reforest areas where trees had been lost in parts of Africa.
We tracked the movements of fruit bats in Ghana, Burkina Faso and Zambia by deploying them with small GPS loggers, which allowed us to follow their nightly movements to food trees. We also looked into how long they held food in their gut. We then applied our findings to entire colonies to see what services they provided in large numbers.
We found that, in a conservative estimate, a colony of 150,000 animals could disseminate more than 300,000 small seeds in a single night, and that a single colony of fruit bats could kickstart the regrowth of 800 hectares of forest.
Fruit bats: the winged 'conservationists' reforesting parts of Africa