Rotifer
community structure in tropical lakes with different environmental
characteristics related to ecosystem health
W.A.D.
Umi1, F.M. Yusoff1,2*, A.Z. Aris3 and Z.
Sharip4
1Laboratory of
Marine Biotechnology, Institute of Bioscience, Universiti Putra Malaysia,
43400 Serdang, Selangor, Malaysia
2Department of
Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400
Serdang, Selangor, Malaysia
3Department of
Environmental Sciences, Faculty of Environmental Studies, Universiti Putra
Malaysia, 43400 Serdang, Selangor, Malaysia
4Lake Research
Unit, Water Quality and Environment Research Centre, National Hydraulic
Research Institute of Malaysia, 43300 Seri Kembangan, Selangor, Malaysia
*Corresponding
Author E-mail: fatimahyus@gmail.com
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Key
words
Community structure
eutrophic
mesotrophic
rotifers
tropical lakes
Publication Data
Paper received : 08.05.2017
Revised received : 07.07.2017
Re-revised received :
15.10.2017
Accepted : 28.12.2017
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Abstract
Aim: This study was
conducted to evaluate the rotifer composition and abundance in lakes with
different environmental characteristics in an attempt to identify the
relationship between the rotifer community structure and environmental
parameters. ???
Methodology: Bimonthly
samplings were carried out in Sembrong, Putrajaya and Subang lakes from April
2015 to February 2016. Duplicate rotifer samples were collected with a 60 ?m
mesh net using vertical hauls from about 30 cm from bottom to the surface,
and preserved with 10% buffered formalin to produce 5% final solution for
identification and enumeration. Physico-chemical parameters were measured in
situ using YSI multi-parameter, and nutrient analyses were accomplished
upon arrival in the laboratory of Marine Biotechnology, Universiti Putra
Malaysia. ????
Results: A recently
created meso-eutrophic Putrajaya lake had the highest number of rotifer
species (11 families and 28 species), followed by the hypereutrophic Sembrong
lake (10 families and 24 species). In the acidic-mesotrophic lake, only 17
species of rotifers from nine families were found. In this acidic water-body,
Ptygura libera was the most dominant species contributing to 76.1% of the
total rotifer abundance. In Putrajaya lake, Keratella cochlearis contributed
to 38.0% of rotifer populations followed by P. libera with 33.0%. Brachionus
forficula and Brachionus calyciflorus were dominant in Sembrong lake which
made up of 41.2% of total rotifer species. Putrajaya lake had highest density
of rotifers with a total mean density of 239.4 ? 30.3 ind. l-1
compared in Sembrong lake (158.7 ? 16.6 ind. l-1) and Subang lake
(58.9 ? 18.5 ind. l-1). The canonical correspondence analysis
(CCA) scores indicated that the abundance of B. calyciflorus and B. forficula
was related to the eutrophic condition associated with the high total
phosphorus and chlorophyll a. Ptygura libera seemed to be associated in less
nutrient rich waters, and seemed to be tolerant to acidic waters.
Interpretation: This study
illustrated that the dominance of rotifer species was related to the lake
health status. The abundance of Brachionus, Keratella and Trichocerca
were related to the eutrophic condition associated with turbidity, total
dissolved solid (TDS), chlorophyll a and nutrient concentrations. Ptygura
libera seemed to be associated with less nutrient rich water tolerant to
acidic waters (pH 4-5).
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? 2018 Triveni Enterprises. All rights reserved. No part of the Journal can
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regarding the authenticity of the data, and the acceptability of the
conclusions enforced or derived, rest completely with the author(s).
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