TABLES (Continued) 



Page 



19 Total nest count accuracy in selected Massachusetts 



gull colonies 36 



20 Comparison of two sampling techniques for estimating total 

 nests in selected gull and heron colonies in Massachusetts 



and Rhode Island 37 



21 Field investigators, 1976-1977 39 



22 Cost analysis of fixed-wing aircraft, helicopter, and 



ground (boat-foot) censusing of waterbird colonies 41 



23 Regression analysis of aerial estimates of adults versus 



nest counts in selected waterbird colonies 43 



24 Comparisons of observer estimates of adults versus nest 



counts at nine Maine gull colonies, 31 May 1977 47 



25 Comparisons of observer estimates of adults versus nest 



counts at 11 Massachusetts gull colonies, June 1977 48 



26 Factors used to convert aerial estimates of adults into 



numbers of breeding pairs (nests) in a colony 49 



27 Population trends of colonial birds in Maine (Cape Elizabeth, 



South) exclusive of the Isles of Shoals, 1900-1977 55 



28 Population trends of colonial birds at the Isles of Shoals 

 (Maine-New Ham.pshire), 1900-1977 53 



29 Population trends of colonial birds in Massachusetts, 



1900-1977 60 



30 Population trends of colonial birds in Rhode Island, 



1900-1977 53 



31 Population trends of colonial birds in Connecticut, 



1900-1977 65 



32 Population trends of colonial birds in Mew York 



(Long Island), 1900-1977 67 



33 Population trends of colonial birds in New Jersey, 



1900-1977 70 



34 Population trends of colonial birds in Delaware, 



1900-1977 74 



