Applied Biology and Biotechnology

 ISSN:  2320 –7825  (Print); eISSN   2320 –7833  (Online)

 Volume No. 3(1)                              March,2015

A Numerical-Taxonomic A Study of the Juncus L. (Juncaceae) in North, Razavi and South khorassan provinces in Iran

R. Ahmadpour, A.R. Bahrami,J. Vaezi and F. Memariani

Abstract

The genus Juncus L. belongs to the family Juncaceae, which has over 250 species worldwide. In Flora Iranica, this genus has six subgenera: Juncus, Genuini, Pseudotenagia, Poiophylli, Septati and Alpini. In this study, we investigated seven spices of Juncus that belongs to four different subgenera and studied morphologically characters in the case of annual and perennial species of Juncus in the Northest of Iran. A total of 74 characters were examined on each specimen, comprising 37 quantitative and 28 qualitative characters. Cluster analysis with UPGMA method and principal component analysis were used to investigate the differences among species of Juncus in Khorassan province. The results explained that the morphological characters are useful to discriminate taxa. The results of CA and PCA analysis shows that the Cluster analysis was better than principal component analysis for species boundaries. In CA analysis, two main groups were distinguished that the first group includes perennials and second group includes annuals species. We concluded that micromorphological characters are somewhat but not fully useful for species boundaries. Keywords: Juncus, Juncaceae, Cluster analysis, principal component analysis, Iran

Species Composition and Abundance of Phytoplankton Communities in relation to Physico Chemical Parameters of Lake Tana at Gulf of Bahir Dar, Ethiopia

Flipos Engdaw and C. Subramanian

Abstract The species composition and its abundance of phytoplankton community were studied in the shore of Lake Tana at Bahir Dar during Janurary, 2014. For physico chemical parameters such as Temperature (T), pH, Dissolved Oxygen (DO), transparency and turbidity on site measurements were made from four different sites. Each parameter was measured in five replicates by using standard methods. The other factors such as Euphotic zone and vertical attenuation coefficient were also determined. A total of thirty four phytoplankton genera / species belonging to four higher taxa were identified. The Chlorophyta dominated the phytoplankton community and contributed 38.2 % with 13 species followed by Bascillariophyta, Cyanophyta and Euglenophyta. However, the Cyanophyta found to be the most abundant (88 % of occurrence accounted 54.6 % of the total abundance) followed by Chlorophyta, Bascillariophyta and Euglenophyta. The one way ANOVA results indicates that the dissolved oxygen and transparency, showed significant variations between sites (p < 0.05) while others not showing any significant variations (p >0.05). Key words: Lake Tana, Physico chemical parameters, Phytoplankton and Species composition.