Interaction effects of multi-metal solutions (As, Cr, Cu, Ni, Pb and Zn) on life history traits in the rotifer Plationus patulus.

Department of Biological Sciences, University of Texas at El Paso, El Paso, Texas, USA.
Journal of Environmental Science and Health Part A (Impact Factor: 1.14). 09/2007; 42(10):1473-81. DOI: 10.1080/10934520701480904
Source: PubMed

ABSTRACT While many studies have determined toxicity of single heavy metals, few have addressed the combined effects of multiple elements at different concentrations. In order to estimate how metal mixtures affect population dynamics of freshwater rotifers, we exposed Plationus patulus to environmentally relevant concentrations and combinations of arsenic and five heavy metals (Cr, Cu, Ni, Pb and Zn) for 8 days. The life-history parameters, intrinsic rate of increase (r), relative cumulative reproduction (RCR), mortality ratio, mictic ratio, fertilization ratio, and number of deformed offspring were used as endpoints. Exposures were repeated 4 times and considered as blocks in the experimental design. Differences between treatments were evaluated through ANOVA and LSD mean analysis. The combined presence of As, Cu, Ni, Pb, and Zn in different concentrations produced a variety of changes in the population dynamics of P. patulus. However, only Cr produced a significant element*environment interaction. The presence of Cr leads to significant decreases in the intrinsic rate of increase and increased mortality ratio in multi-metal environments. The population growth (as r) decreased from 0.25 to -0.16 due to Cr (10 microg/L) interaction with the remaining elements, and values 0.16-0.12 were observed in treatments containing high levels (50 microg/L) of Cr. Mortality ratio increased from 0.066 to 0.822 due to Cr (10 and 50 microg/L) interactions with the remaining elements at high concentrations. Responses of this basal consumer to metal mixtures will provide insights into how aquatic food webs and their constituent organisms can be altered by anthropogenic inputs like heavy metal contamination.

1 Bookmark
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Heat shock proteins play an important role in protein homeostasis under stress conditions, and act as molecular chaperons in living organisms. Here, we investigate acute toxicity of heavy metals (Cu and Cd) and the transcriptional changes of the heat shock proteins (hsps) family genes (hsp20, hsp27, hsp70, hsp90α-1, and hsp90β) in Brachionus koreanus-exposed to heavy metals. As a result, 48-h LC50 values were 0.956 mg/L (95%-cl. 0.678–1.348) for Cu and 57.563 mg/L (95%-cl. 47.691-69.477) for Cd. The expressions of hsp90α-1 and hsp70 mRNA level at all concentrations were significantly upregulated 24 h after exposure to Cu and Cd. In particular, a significant increase in hsp27 and hsp70 mRNA level indicated higher sensitivity to Cd. This finding indicates that HSPs play protective roles under heavy metal stress in this species. In addition, the expression profiles of hsp27, hsp70, and hsp90α-1 may be useful as molecular marker for monitoring heavy metal toxicity in the aquatic environment.
    12/2013; 4(4). DOI:10.1007/s13530-012-0141-6
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: El arseniato de plomo es un plaguicida empleado en la agricultura peruana. Los protocolos de bioensayos nos permiten determinar el efecto de este plaguicida sobre distintos componentes biológicos. El parámetro de toxicidad aguda más comúnmente empleado es la concentración letal media (CL50). El objetivo de este trabajo fue evaluar los efectos ecotoxicológicos del arseniato de plomo, sobre ocho invertebrados no destinatarios. Se encontró la siguiente secuencia en orden decreciente de ecotoxicidad aguda en términos de arsénico a 48 h de exposición: Daphnia magna (CE50 = 3,1 mg L–1) > Trichogramma fuentesi (CL50 = 11,2 mg L–1) > Chrysoperla asoralis (CL50 = 29 mg L–1) > Trichogramma pretiosum (CL50 = 32,9 mg L–1) > Ceraeochrysa cincta (CL50 = 94,4 mg L–1) > Orius insidious (CL50 = 304 mg L–1) > Telenomus remus (CL50 = 364 mg L–1) > Heleobia cumingii (CL50 = 10.669 mg L–1). C. asoralis fue más sensible en la no eclosión de huevos que C. cincta. Para T. pretiosum y T. fuentesi se observó efectos en la emergencia de adultos desde 160 y 800 mg As L–1, respectivamente. A partir de estos resultados, se evaluó el riesgo ambiental (ERA) de este insecticida. Los cuocientes de riesgo (CR) indicaron en todos los casos un alto riesgo del arseniato de plomo en el ambiente.
    01/2009; 4(1-3):73-82. DOI:10.5132/jbse.2009.01.010
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Lead arsenate is one of the most employed pesticides in Peruvian agriculture. Protocols of bioassays allow us to determinate the effect of this pesticide on different biological components. The acute toxicity parameter more commonly employed is the median lethal concentration (LC50). This research aimed to evaluate the ecotoxicological effects of lead arseniate on eight non-target invertebrates. The folowing sequence in decresing acute ecotoxicity order in terms of arsenic after 48 h of exposure was found: Daphnia magna (EC50 = 3.1 mg L–1) > Trichogramma fuentesi (LC50 = 11.2 mg L–1) > Chrysoperla asoralis (LC50 = 29 mg L–1) > Trichogramma pretiosum (LC50 = 32.9 mg L–1) > Ceraeochrysa cincta (LC50 = 94.4 mg L–1) > Orius insidious (LC50 = 304 mg L–1) > Telenomus remus (LC50 = 364 mg L–1) > Heleobia cumingii (LC50 = 10,669 mg L–1). Considering eggs hatching, C. asoralis was more sensible than C. cincta. For T. pretiosum and T. fuentesi were observed effects on adult’s emergency since 160 and 800 mg As L–1, respectively. From these results, environmental risk assessment (ERA) of this insecticide was calculated. Risk quotient (RQ) indicated in all cases, that lead arseniate is highly risky to environment.

Full-text (2 Sources)

Available from
May 31, 2014