A study on the distribution of Ephemeroptera, Plecoptera, Trichoptera and Odonata in relation of environmental interruptions was done at three different rivers tributaries of Bukit Merah Reservoir, Perak namely Sungai...A study on the distribution of Ephemeroptera, Plecoptera, Trichoptera and Odonata in relation of environmental interruptions was done at three different rivers tributaries of Bukit Merah Reservoir, Perak namely Sungai Jelai, Sungai Ara, and Sungai Kurau from October 2013 to January 2014. A total of 1 942 individuals were collected during the 4month of the study. The number of Ephemeroptera was highest, which was found at Sungai Jelai and Sungai Kurau and dominated by Baetis from family Baetidae while at Sungai Kurau dominated by Trichoptera, Hydropsyche from family Hydropsychidae. Ecological and biological indices have been used to evaluate the diversity of Ephemeroptera, Plecoptera, Trichoptera and Odonata at each river. The highest Simpson's diversity index(D=0.893) and Pielou's evenness index(E=0.803) were recorded at Sungai Jelai while Sungai Ara had the highest value of Margalef's richness index(MgR I=5.698). The variance for the assemblages of Ephemeroptera, Plecoptera, Trichoptera and Odonata influenced by9 chemical and physical variables was really a satisfactory with total variance explained of 57.2%. The results of canonical correspondence analysis(CCA) model showed that two groups of insects taxa characterized by water parameters.The first group from the CCA analysis clustered the Ephemeroptera, Plecoptera, Trichoptera and Odonata genera showed that deterioration in dissolved oxygen concentration, pH and nitrate while the second group showed dependence on total dissolved solids(TDS), conductivity, total suspended solid(TSS) and velocity. The study showed that the distribution of Ephemeroptera, Plecoptera, Trichoptera and Odonata taxa was affected by the environmental interruptions such as human residential area, agricultural plantation and river embankment.展开更多
基金Under the auspices of Universiti Sains Malaysia Research University Grant(1001/PBIOLOGI/815092)
文摘A study on the distribution of Ephemeroptera, Plecoptera, Trichoptera and Odonata in relation of environmental interruptions was done at three different rivers tributaries of Bukit Merah Reservoir, Perak namely Sungai Jelai, Sungai Ara, and Sungai Kurau from October 2013 to January 2014. A total of 1 942 individuals were collected during the 4month of the study. The number of Ephemeroptera was highest, which was found at Sungai Jelai and Sungai Kurau and dominated by Baetis from family Baetidae while at Sungai Kurau dominated by Trichoptera, Hydropsyche from family Hydropsychidae. Ecological and biological indices have been used to evaluate the diversity of Ephemeroptera, Plecoptera, Trichoptera and Odonata at each river. The highest Simpson's diversity index(D=0.893) and Pielou's evenness index(E=0.803) were recorded at Sungai Jelai while Sungai Ara had the highest value of Margalef's richness index(MgR I=5.698). The variance for the assemblages of Ephemeroptera, Plecoptera, Trichoptera and Odonata influenced by9 chemical and physical variables was really a satisfactory with total variance explained of 57.2%. The results of canonical correspondence analysis(CCA) model showed that two groups of insects taxa characterized by water parameters.The first group from the CCA analysis clustered the Ephemeroptera, Plecoptera, Trichoptera and Odonata genera showed that deterioration in dissolved oxygen concentration, pH and nitrate while the second group showed dependence on total dissolved solids(TDS), conductivity, total suspended solid(TSS) and velocity. The study showed that the distribution of Ephemeroptera, Plecoptera, Trichoptera and Odonata taxa was affected by the environmental interruptions such as human residential area, agricultural plantation and river embankment.
