RADIOISOTOPIC STUDY OF MERCURY UPTAKE 279 



TABLE 2 



MERCURY CONCENTRATION FACTORS FOR SELECTED 



AQUATIC BIOTA AFTER 1-DAY EXPOSURE TO 



INORGANIC MERCURY COMPOUNDS* 



Biota Hg(N03 )2 HgCl2 



Phytoplankton 

 Bacillariophyta 

 Melosira sp. 1,100,000 ± 170,000 (2) 



Synedra sp. 220,000 ± 33,000 (2) 



Chrysophyta 



Scenedesmus sp. 93,000 ± 36,000 (2) 



Hudson River algae, 49,000(1) 92,000(1) 



detritus, and bacteria 

 Crustacea 

 Cladocera 

 Daphnia pulex 62,000 ± 11,000 (3) 200,000 ± 130,000 (6) 



Leptodora kindti 200,000(1) 



Ostracoda 



Cypns sp.t 58,000(1) 



Copepoda 

 Nauplii 9,800 ± 1,200 (2) 



Copepods (cyclopoid 3,700 ±920 (2) 2,830 ± 310 (2) 



copepodids) 

 Mesocy clops edax 194,000 ± 14,000 (2) 



Eurytemora affinis 104,000 ± 32,000 (7) 230,000 ± 160,000 (7) 



Acartia tonsa 61,000 ± 23,000 (2) 14,000 ± 13,000 (2) 



Isopoda 



Chiridotea almyraf 2,336 ± 30 (2) 



Amphipoda 

 Gammarus sp. (G. daiberi 1,440 ± 400 (14) 1,490 ± 520 (23) 



and G. tigrinus) 

 Monoculodes edwardsi 1,330 ± 780 (2) 



Mysidacea 



Neomysis americana 133(1) 95(1) 



Decapoda 

 Crangon septemspinosaf 18,000 (1) 



MoUusca 

 Gastropoda 

 Amnicola limosa 412 ± 40 (3) 



Ichthyoplankton 

 Percichthyidae 

 Morone saxatilis 

 Eggs 58 ±25 (2) 



Larvae 1,300 ± 770 (4) 7,600 ± 5,900 (5) 



♦Numbers in parentheses are numbers of experiments. 



fConcentration factors are based on uptake after exposure of 5 to 9 days. 



