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Seasonality of vocal activity of a bird community in an Afrotropical lowland rain forest

Published online by Cambridge University Press:  06 March 2018

Jana Vokurková Open the ORCID record for Jana Vokurková [Opens in a new window] ,
Francis N. Motombi ,
Michal Ferenc Open the ORCID record for Michal Ferenc [Opens in a new window] ,
David Hořák Open the ORCID record for David Hořák [Opens in a new window]  and
Ondřej Sedláček Open the ORCID record for Ondřej Sedláček [Opens in a new window]
Jana Vokurková*
Affiliation:
Department of Ecology, Faculty of Science, Charles University, Viničná 7, 128 44 Praha 2, Czech Republic
Francis N. Motombi
Affiliation:
Mt Cameroon NP, Buea, Cameroon
Michal Ferenc
Affiliation:
Department of Ecology, Faculty of Science, Charles University, Viničná 7, 128 44 Praha 2, Czech Republic
David Hořák
Affiliation:
Department of Ecology, Faculty of Science, Charles University, Viničná 7, 128 44 Praha 2, Czech Republic
Ondřej Sedláček
Affiliation:
Department of Ecology, Faculty of Science, Charles University, Viničná 7, 128 44 Praha 2, Czech Republic
*
*Corresponding author. Email: jankavok@seznam.cz
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Abstract:

Recent observations from the tropics indicate seasonal peaks in breeding and vocal activity of some bird species. However, information about seasonality in vocal activity at the community level is still lacking in the tropics. We examined seasonal variation in the diurnal vocal activity of lowland rain forest birds on Mount Cameroon, using weekly automatic sound recording throughout the whole year and related it to rainfall and temperature. We show that the bird community in lowland rain forest vocalized year-round, but species richness as well as the vocal activity of the community varied greatly during the year. This variation coincided with the seasonality of rainfall. The highest number of species (31.5 on average) sang at the beginning of the driest period, followed by a gradual decrease in singing with increasing rainfall (minimum 14.5 species). This indicates that intensive rainfall indirectly limits the vocal activity of the tropical rain-forest bird community. Temporal turnover of vocalizing species as well as within-day variation in vocal activity was highest during the transition period between dry and rainy seasons. We suggest that this could reflect differing timing in the breeding activity of particular feeding guilds to follow seasonal peaks of their diets.

Keywords

Afrotropicsbirdslowland rain forestseasonalitysong
Type
Research Article
Information
Journal of Tropical Ecology , Volume 34 , Issue 1 , January 2018 , pp. 53 - 64
Copyright
Copyright © Cambridge University Press 2018 

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