Zainodin, ‘Amila Faqhira
(2016)
Study On Basal Food Trophic In Two Different Freshwater Ecosystem.
Masters thesis, Universiti Sains Malaysia.
Abstract
Kajian ini menyiasat komposisi serangga akuatik, aktiviti hanyutan dan
jaringan makanan mereka di kawasan terpilih di negeri Perak, utara Malaysia. Empat
sungai di Bukit Merah telah dipilih untuk mengkaji hubungan komposisi serangga
akuatik dengan ciri-ciri sungai. Satu ribu lapan puluh tujuh (1087) individu daripada
tujuh order dan 27 famili telah dipungut daripada semua sungai kajian. Koleksi
serangga akuatik yang terbanyak telah diperolehi di Sungai Ara dengan 580 individu.
Selain menggunakan komposisi serangga akuatik, ciri-ciri fizikokimia air juga telah
digunakan untuk memantau kesihatan sungai secara meluas. Semua sungai kajian di
Bukit Merah diklasifikasikan sebagai bersih (Kelas II) berdasarkan Indeks Kualiti Air
(IKA). Fizikokimia sungai iaitu, kedalaman, ammonia-nitrogen, jumlah pepejal
terampai, keperluan oksigen kimia dan halaju mempengaruhi taburan dan
kepelbagaian fauna akuatik. Untuk lebih memahami kepelbagaian dan kaedah
penyebaran serangga akuatik, corak hanyutan dan keberkalaan diel serangga akuatik
telah dikaji. Serangga akuatik yang hanyut telah dipungut pada setiap selang enam jam
dalam tempoh 24 jam menggunakan pensampel drif. Tiga ribu seratus empat puluh
tujuh (3147) individu yang diwakili oleh sembilan order, 49 famili dan 81 genera
serangga akuatik yang hanyut telah dikumpulkan.
Present study investigated the composition of aquatic insects, their drift
activities and their food webs in selected sites in Perak, northern state of Malaysia.
Four rivers in Bukit Merah were chosen to study the relationship of aquatic insect
composition with the characteristics of the river. One thousand and eighty-seven (1087)
individuals from seven orders and 27 families were collected from all study rivers.
The most abundant aquatic insect collection was obtained at Ara River with 580
individuals. Besides using composition of aquatic insects, the physicochemical
characteristics of the water also has been used to monitor health of rivers world widely.
All study rivers in Bukit Merah were classified as clean (Class II) based on the Water
Quality Index (WQI). The physicochemistry of the rivers i.e., depth, ammoniacalnitrogen,
TSS, COD and velocity affected the distribution and diversity of the aquatic
fauna. To further understand aquatic insects’ diversity and their method of dispersal,
drift pattern and diel periodicity of aquatic insects was investigated. Drifting aquatic
insects were collected at every six hourly intervals within 24-hour period using a drift
sampler. Three thousand one hundred and forty-seven (3147) individuals represented
by nine orders, 49 families and 81 genera of drifting aquatic insects were collected.
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