Several migrant species appear to use this area exclusively in their nonbreedingseason and should be included in the list of endemics.
Food demands of nestlings have a great influence on the time and energy allocation of breeding over nonbreeding seabirds.
To say that these nonbreeding species have no significant impact on resource exploitation or on organization and evolution among breeding members would be naive.
In addition, we should not forget some migrants that make exclusive use of this area in their nonbreeding season.
An exception to this is the food subsidy provided by man, which seems to have been important in creating a nonbreeding population of herring gulls large enough to form a "critical mass" for the formation of a new gullery.
Numbers of nonbreeding mute swans or greylag geese may sometimes be a nuisance, trampling eggs and nestlings in seabird colonies.
Divoky (1976) studied diets of pack-ice gulls during the nonbreeding season, but those species are not included in the present analysis because they rarely are found south of the Bering Strait.
It is unknown whether birds are more vulnerable to time and energy shortages in the harder nonbreeding season or in the breeding season after the extra demands of reproduction have been accounted for.
First, few studies have ever considered in detail the trophic relations of seabird communities during the winter or nonbreeding season.
Several different definitions of "seabird" have been used at this conference, but certainly there are dozens, and probably scores, of genuine marine species that either breed in the area or use it as a major nonbreeding area.
Our specimens probably were nonbreeding birds summering between the breeding range in arctic America and the winter range in northern South America.
Eleven species occur on the island as nonbreeding summer residents, about which we will have more to say below.
The dates of our records suggest that nonbreeding birds summer along the coast of Tamaulipas.
However, the packs studied there could not be identified with certainty, and little information was obtained about nonbreeding population units.
To test the proposed hypothesis with certainty, a larger number of identifiable breeding and nonbreeding population units from the same general area must be followed during at least one winter.
This is apparently a nonbreeding plumage, for I have seen it only in birds taken far south of the breeding range.
I was not even certain of her sex, and her solitude and her quiet behavior made me doubt whether, after all, she might not be a nonbreeding bird.
The regular northward migration in Massachusetts ceases about June 7, although an occasional nonbreeding bird may remain, and the migrants begin to return about July 4.
As it is a well-known fact that many, if not all, immature and nonbreeding shore birds remain far south of their breeding ranges all summer it has not seemed necessary to mention this in each case.
Nonbreeding birds, or immatures, remain there all summer, as they do in other parts of their winter range.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nonbreeding" in a variety of sentences. We hope that you will now be able to make sentences using this word.
