Tjut Sugandawaty Djohan(1*)

(1) Laboratorium Ekologi dan Konservasi Fakultas Biologi Universitas Gadjah Mada
(*) Corresponding Author


The purpose of this research is to study the response of benthic insect community in the headwater of Boyong
River, Mount Merapi, four months post-forest fire in 2002. Energy at the headwater ecosystem was based on the
detritus food-chain. The presence of benthic community indicated forest health. The forest fire caused energy which
entered into the river changed from allochtonous coarse particulat organic matter (CPOM) to fine particulat
organic matter (FPOM). This change would be responded by the functional group of benthic community. Data
were collected with Surber Sampler. The result showed that there were 12 genus constituent of benthic insects
consisted of functional groups of collector gather, collector filter, predator, dan scrapper. The dominant functional
groups were collector gather and collector filters, 2256 individual/m3 or 86.02% and the dominant genus of Baetis
and Leutcra. Otherwise, scrapper was founded 111 individual/m3 or 4% and predator 256 individual/m3 or 10%.
This condition showed that four months post-forest fire indicated dominant allochtonous in Boyong River was
CPOM and FPOM with size of 1 mm. The quality of nutrients in the water was low, otherwise, the sediment
nutrients was high. The dominance of functional group of collectors indicated that ecosystem of headwater forest
in Boyong River had not been fully recovered.


Headwater; Catchment area; Collector functional group; Tropical rainforest

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