Large changes in numbers could probably be detected. Only very large changes in populations can be detected. These data should not be used to infer any changes in population, however large. U No Data Quality code can be assigned, because the observer did not describe methods adequately. Describes what the birds were doing at the colony.
Numbers refer to list of citations.
If there is more than one citation per species, other reference numbers are in notes for this species. Who censused the birds, for the species listed. May be different from authors of cited literature.