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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Mar 2009, 29 (2)                                     Back


Impact of different doses of lead on internal organs of quails

Combined effects of heavy metal (Hg) concentration and algal (Chlorella vulgaris) food density on the population growth of Brachionus calyciflorus
(Rotifera: Brachionidae)

Teresa Ramirez Perez and S.S.S. Sarma*

Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies,

National Autonomous University of Mexico, Campus Iztacala

Av. de los Barrios No.1, AP 314, CP 54090, Los Reyes, Tlalnepantla, State of Mexico, Mexico

 

(Received: August 14, 2006 ; Revised received: March 01, 2007 ; Accepted: April 15, 2007)

Abstract: The combined effects of two food levels (0.5 X106 and 1.5 X106 cells ml-1 of Chlorella vulgaris) and five concentrations (0, 0.000625, 0.00125, 0.0025, 0.005 mg l-1 of HgCl2) of mercury on the population growth of the rotifer Brachionus calyciflorus was evaluated. The growth experiments were conducted for 18 days at 23?1oC under continuous fluorescent illumination. For each food level ? heavy metal combination, we maintained 3 replicates. Our data showed that regardless of food level, increase in the heavy metal concentration in the medium resulted in decreased population growth of B. calyciflorus. At any given heavy metal concentration, B. calyciflorus grown under higher food levels had higher population abundance. The rate of population increase was significantly influenced by both the heavy metal concentration and the algal level. The highest population growth rate (0.435?0.003 per day) was observed in controls at 1.5 X106 cells ml-1. The results of this study were discussed in relation to the protective role of algal density against heavy metal toxicity.

Key words: Heavy metal, Zooplankton, Rotifer, Alga

 

PDF of full length paper is available with author (sarma@servidor.unam.mx)

 

 

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