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Aechmophorus occidentalis
Ardea herodias
1
Aythya affinis
1
Casmerodius albus
1
Christmas Bird Counts
1
Circus cyaneus
1
DDT
Egretta alba
1
Egretta thula
1
Fulica americana
1
Hydroprogne caspia
1
Key words
1
Nycticorax nycticorax
1
Oreochromis mossambicus
1
hydrogen sulfide
1
long- term trends
1
organochlorine
1
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