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Serviços ambientais prestados por morcegos frugívoros na recuperação de áreas degradadas

This paper is available in a repository.
This paper is available in a repository.

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Abstract

Fruit-eating bats are considered one of the most important groups of seed dispersers in the Neotropics. These phyllostomid bats consume a huge number of fruit species, defecating viable seeds in flight or under feeding perches. However, most species feed on fruits of pioneer plant species within forest patches and in forest margins, and take the seeds to distant places, contributing significantly to plant successional processes that follow disturbances of varying degrees. In the Atlantic Forest, the three most abundant bat genera (Artibeus, Carollia e Sturnira) frequently fly over heterogeneous landscape mosaics, including open areas, where they can discard seeds. A comprehensive review on the diet of Atlantic Forest frugivorous bats revealed the consumption of 37 plant families, 81 genera and more than 140 species. These species were represented by different life forms and successional categories, but with predominance of pioneer trees and shrubs. Forest restoration techniques that take advantage of the ecological service of seed dispersal provided by bats are being developed based on their attraction to open degraded areas in order to improve local seed rain and seed banks. Nevertheless, as parameters to assess the economic valuation of this service properly are lacking, we present points out some that can be readily used. Given the limitation of available data we assumed a defecation rate of 12 fecal samples/individual/day which resulted in a potential dispersal between 600 and 25,930 seeds/ha/day. These numbers are based on the frequency of use of four Atlantic Forest plots by five species of frugivorous bats. Since previous studies found that, on average, 66% of all seeds dispersed by bats do germinate, previous figures were corrected accordingly and compared to the costs of planting seedlings with the purpose of restoring Atlantic Forest patches using the replacement cost approach. By doing so, we were able to present here the first economic valuation of the seed dispersal service provided by fruit-eating bats. However, the economic values should not be considered absolute or reference values, but as a stimulus for future discussion on this theme as well as for data collection and analysis.