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Populations of arboricole ardeidae in the rhone delta 1968 1977 changes in the population number reproduction period



Populations of arboricole ardeidae in the rhone delta 1968 1977 changes in the population number reproduction period



Alauda 47(3): 151-156



The numbers of tree-nesting herons (Egretta garzetta, Nycticorax nycticorax, Ardeola ibis and A. ralloides) which usually nest together in the same colonies in Camargue were counted in each colony for 4 yr (1974-1977). The total number of each species nesting in Camargue each year during a period of 10 yr (1968-1977) is figured. Colonies are formed from the end of March, or more usually from the beginning of April, to Aug. E. garzetta lays its eggs from the end of the 1st wk of April to the end of June, N. nycticorax from the end of March to the beginning of July, A. ralloides in May, June and July and A. ibis from the middle of April to the beginning of Aug.

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Accession: 006146752

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