Scale- and trait dependent responses of bird communties to lowland rainforest restoration and frugivore-bird-seed interaction networks in Sumatra, Indonesia

von William Marthy
Dissertation
Datum der mündl. Prüfung:2014-02-05
Erschienen:2014-02-10
Betreuer:Prof. Dr. Teja Tscharntke
Gutachter:Dr. Matthias Waltert
Gutachter:Prof. Dr. Stefan Vidal
Gutachter:Dr. Christoph Scherber
Zum Verlinken/Zitieren: http://dx.doi.org/10.53846/goediss-4354

 

 

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Name:Wmarthy Dissertation 2014 FINAL4xxx.pdf
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Description:PhD dissertation

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Zusammenfassung

Englisch

Recovery of tropical secondary forest will require human assistance. The first important part in forest restoration is understanding the existing biodiversity and ecosystem service within the secondary forest and use this to decide appropriate forest restoration treatment and to measure of progress towards success. This knowledge is still limited for many secondary forest in Southeast Asia. This research aimed to provide this knowledge, specifically we looked at bird community structure, the birds seed dispersal, and bird densities in the secondary forest of the Harapan Rainforest Concession, Jambi Province, Sumatra, Indonesia, between 2011-2012. Our results showed habitat-scale variables that correlate with different bird functional groups hence can be used to identified appropriate forest restoration treatment to assist bird groups that have been found to decline after logging. We provided density information for 45% of lowland bird specialist in Sumatra (i.e. species occur below 200 meter altitude). This baseline densities could be used to assess progress in restoration, particularly for species with lower density in degraded forest (young secondary forest) compared to less degraded forest (old secondary forest). At network level, frugivore bird-seed interaction networks in young and old secondary forest were relatively similar and dominated by generalist birds. A change in species importance between the two forest types were observed, i.e. important frugivore species in one forest type was not important in another forest type, perhaps due to differences in bird densities (i.e. species with higher density is the most important frugivore bird). In short, bird densities and bird community structure in the secondary lowland rainforest of Sumatra were affected by forest characteristics at different spatial scales, which influenced also the birds seed dispersal and thereby, their contribution to forest regeneration. We provided detailed information on the forest use patterns of birds as a basis for improved restoration management practices.
Keywords: bird, seed dispersal network, IUCN, distance sampling, density, weed
 
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