"Optimal" colony size for least terns: an intercolony study of opposing selective pressures by predators

Article Abstract:

Some bird species, such as cliff swallows and herring gulls, guard against predation by means of colonial breeding, resulting in lower rates of nest predation. A new study compares breeding success and causes of nesting failure for least terns nesting in CT. Colony size ranged from two to 606 nests. The study shows that the impact of predation varied with the predator type, although the number of nest losses decreased as the size of the colony increased. However, nesting success did not expand with increased nesting synchrony, and less synchronous colonies appeared to be more successful.

Sea birds, Seabirds

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Reproduction and breeding success of California Least Terns in Jalisco, Mexico

Article Abstract:

The habitat of California Least Terns on Cuixmala in the Mexican state of Jalisco is a characteristic place for the species. California Least Terns generally go back every year to the same beaches for reproduction as recorded at Cuixmala. The timing of breeding events in the Cuixmala colony such as nesting behavior, time to hatch, fledging, and leaving the area resemble those of California other colonies. Nesting, perhaps, takes place because the Cuixmala beach is safe. All races of California Least Tern have developed a capacity to colonize new and proper nesting areas.

Analysis, Sexual behavior in animals, Animal sexual behavior, Reproduction (Biology), Reproduction

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Nesting ecology of Townsend's Warblers in relation to habitat characteristics in a mature boreal forest

Article Abstract:

The nesting ecology of Townsend's Warblers in relation to habitat characteristics in a mature boreal forest was studied to identify habitat factors that shape patterns of habitat selection among birds. Nest sites were examined according to factors influencing reproductive success. Results reveal that territory-holding male birds were successful in acquiring mates. Nest success was observable during incubation period. Meanwhile. nesting failure was caused by predation that usually occurs during nestling period.

Habitat (Ecology), Habitats, Alaska

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