Malays. Appl. Biol. (December 2002) 31(2): 1-7
SEASONAL SUCCESSION IN THE MAIN CLADOCERAN ASSEMBLAGE OF A CRATER-LAKE IN JAPAN
RAZAK, S.A.1* and SAISHO, T.2
1 Institute of Biological Sciences, Faculty of Science University of Malaya, 50603 Kuala Lumpur, Malaysia
2 Laboratory of Marine Biology, Faculty of Fisheries, Kagoshima University, Shimoarata 4-50-20, Kagoshima City 890, Japan
ABSTRACT
The seasonal succession pattern of the main cladoceran community found in Lake Ikeda was investigated over a one-year period. The monthly occurrences of the cladoceran species studied were that of Bosmina longirostris, Ceriodaphnia reticulata, Diaphanosoma brachyurum and Bosminopsis deitersi. All the cladoceran species sampled exhibited varying rates of succession with seasonal variance in occurrence and peak abundance among them. Most of the cladocerar population peaked in the summer months although not at the same time. Bosmina longirostris was found to be the mosl dominant cladoceran species inhabiting this lake during summer.
ABSTRAK
Corak sesaran bermusim komuniti kladosera utama yang didapati dalam Tasik Ikeda telah dikaji selama setahun. Corak kewujudan bulanan spesies kladosera utama yang dikaji terdiri daripada spesies Bosmina longirostris, Ceriodaphnia reticulata, Diaphanosoma brachyurum dan Bosminopsis deitersi. Kesemua spesies kladosera yang disampel masing-masing menunjukkan kadar sesaran yang berbeza-beza dengan variasi bermusim dalam kewujudan kelimpahan kemuncak. Kebanyakan kladosera berkemuncak dalam bulan-bulan musim panas walaupun tidak pada masa yang sama. Bosmina longirostris adalah kladosera yang paling dominan dari segi populasi yang menghuni tasik in semasa musim panas.
Key words: Seasonal succession, cladocera, Bosmina longirostris, Ceriodaphnia reticulata, Diaphanosoma brachyurum,Bosminopsis deitersi
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