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Concentration of contaminants in breeding bird eggs from the Colorado River Delta, Mexico
Author(s) -
GarcíaHernández Jaqueline,
Sapozhnikova Yelena V.,
Schlenk Daniel,
Mason Andrew Z.,
HinojosaHuerta Osvel,
RiveraDíaz Juan José,
RamosDelgado Norma Alicia,
SánchezBon Gerardo
Publication year - 2006
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/05-185r.1
Subject(s) - marsh , environmental chemistry , delta , pesticide , pollutant , contamination , bird egg , biology , ecology , environmental science , chemistry , wetland , engineering , aerospace engineering
Organic contaminants (organochlorine [OC], organophosphorus [OP] pesticides and polychlorinated biphenyls [PCBs]), and metals (As, Cd, Hg, Pb, and Se) are a concern to avian health in the Colorado River delta, Mexico. We determined concentrations of contaminants in eggs of three breeding species of birds from the delta (mourning doves [ Zenaida macroura ], burrowing owls [ Athene cunicularia ], and marsh wrens [ Cistothorus palustris ]). We collected 27 eggs of mourning doves, eight eggs of burrowing owls, and 18 eggs of marsh wrens for analyses. Polychlorinated biphenyls, OC, and OP pesticides were analyzed by gas chromatography equipped with an electron capture detector, and metals were analyzed by inductively coupled plasma mass spectrometry. The non‐ ortho PCB congeners (PCB 77 and 126) were found in mourning dove and burrowing owl eggs at concentrations in which hatchability can be affected. Mean selenium concentration found in marsh wren eggs (5.6 μg/g dry wt) exceeded the level of concern. Arsenic and Cd were found at higher than normal concentrations, Hg concentrations did not exceed the level of concern in any of the species, and Pb concentrations were higher in eggs of species subject to hunting. With the exception of lead, marsh wren eggs contained the highest metal concentrations.