HOW TO USE THE ATLAS 



Locations of colonies are shown on 7.5-minute quadrangle maps which have been reduced to a scale of 

 approximately 1:60,000. These Colony Maps are indexed on a series of Coastal Maps reduced from an 

 original. These, in turn, are indexed on an Index to Coastal Maps (Figures 1 and 2). 



Each colony site is designated by a numerical six-digit Colony Code and an arrow. If colony sites ex- 

 tended over the entire island, the arrow is drawn to, but not across the island boundary. If only a portion of 

 an island is used for nesting, the arrow crosses the island boundary to designate the precise nesting location. 

 Other map symbols and designations arc shown in Figure 3. 



Tables that accompany the maps contain the following descriptive information about colony sites and 

 the nesting species: 



COLONY CODE NUMBER: 



A six-digit number is assigned to each colony site; the first three digits identify the Coastal Map, the 

 second three identify the individual colony sites (Figure 2). Colony sites in 1977 are numbered consecutively 

 from north to south. Sometimes two or more nesting groups, or subcolonies separated by short distances 

 are indicated as one colony. In such cases, the data for each group are combined in the corresponding 

 Table. 



COLONY NAME: 



Names of islands or other features on the quadrangle maps are used when possible. Prominent map fea- 

 tures are used to identify colony sites at unnamed locations. 



LOCATION: 



The geographic coordinates for each colony site are given to the nearest minute. For large colony sites, 

 coordinates at the center of the site are used. 



SIZE: 



Most colonies are on islands, but often they occupy only part of an island. Therefore, both island size 

 and colony site size are listed. Aerial photos and a grid were used to estimate areas occupied by large colonies. 

 All sizes are expressed to the nearest hectare. All measurements of less than two hectares are shown as < 2. 



HABITAT: 



The location of the colony is described as island or mainland. Modifiers provide additional information 

 on the general type of habitat. 



NESTING SUBSTRATE: 



A brief description of the nesting substrate and vegetation surrounding nests is given. At multiple-species 

 colony sites, more than one type of substrate may be listed. 



OWNERSHIP: 



All land ownership is shown as either public or private. Additional modifiers show the agency and/or 

 level of government. Private conservation agencies are listed, but not individual landowners. 



