| effects of mercury, selenium, and organochlorine contaminants on reproduction of forster's terns and black skimmers nesting in a contaminated texas bay. | mean mercury (0.40 micrograms/g), and geometric mean dde (1.6 micrograms/g) and polychlorinated biphenyl (pcb) (2.3 micrograms/g) concentrations in forster's tern (sterna forsteri) eggs from lavaca bay were higher than those in tern eggs from a reference area in san antonio bay, but residues were not correlated with hatching success. nest success was similar between bays. selenium levels in lavaca bay tern eggs (0.71 micrograms/g) were also comparable to those in eggs from the reference area (0. ... | 1991 | 1899991 |