daphnia                package:nlreg                R Documentation

_D_a_p_h_n_i_a _M_a_g_n_a _D_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     The 'daphnia' data frame has 136 rows and 2 columns.

     Ecotoxicity study to assess the impact of the herbicide dinoseb on
      the survival of _Daphnia magna_ Strauss, 1820, a 
     micro-crustacean widely used as test organism in aquatic 
     ecotoxicological assays.  The design of the experiment includes 35
      irregularly spaced concentrations ranging from 0.006 to 11.3 mg/l
      and a control group.  The upper endpoint of 11.3 mg/l is the
     highest concentration at which the test substance is soluble in
     the test  medium.  The number of replicates per concentration
     varies from 1 to 11 experimental units.  The survival time is
     measured in days.

_U_s_a_g_e:

     data(daphnia)

_F_o_r_m_a_t:

     This data frame contains the following columns:

     '_c_o_n_c' the tested concentration (mg/l); 

     '_t_i_m_e' the survival time in days.


_S_o_u_r_c_e:

     The data were obtained from

     Ch\`evre, N. (2000) _Etude et mod\'elisation des effets 
     \'ecotoxiques d'un micropolluant organique sur_ Daphnia magna _et_
     Pseudokirchneriella subcapitata (in French).  Ph.D.  Thesis N.
     2117, Department of Rural Engineering, Swiss Federal  Institute of
     Technology Lausanne.

_R_e_f_e_r_e_n_c_e_s:

     Brazzale, A.R. (2000) _Practical Small-Sample Parametric 
     Inference_.  Ph.D. Thesis N. 2230, Department of Mathematics,
     Swiss Federal Institute of Technology Lausanne.  Section 5.3,
     Example 5.

     Ch\`evre, N., Becker-van Slooten, K., Tarradellas, J., Brazzale, 
     A. R., Behra, R. and Guettinger, H. (2001) Effects of dinoseb on
     the entire life-cycle of _Daphnia  magna_.  Part II: Modelling of 
     survival and proposal of an alternative to 
     No-Observed-Effect-Concentration (NOEC).  _Environmental 
     Toxicology and Chemistry_, *21*, 828-833.

_E_x_a_m_p_l_e_s:

     data(daphnia)
     attach(daphnia)
     plot(conc, time, xlab = "test concentration (mg/l)", 
          ylab = "survival time (d)", log = "y")
     detach()

