title: [Duration of the pre-nesting period and its relation with social organization in sandpipers (Charadrii, Aves) nesting in north-east Yakutia].
abstract: Investigations were carried out at two stations of Ornithological Unit, IBPN FEB RAS, located in Nizhnekolymsk District, Yakutia, starting from May 18-20 in 1984, 1985, 1987, 1988 and 1990. Duration of the pre-nesting period in 11 sandpiper species with different social organization was studied and compared with each other by allometric equations. As a characteristic of bird size the body mass was selected. Sandpipers come flying to the tundra at almost critical temperatures, to begin breeding as early as possible. Tining of breeding depends on birds feeding manner and the proximity to sites of overwintering. Duration of the pre-nesting period is invariable for every bird species and sex. There are sexual distinctions in time spent for the pre-nesting period in jointly-nesting sandpipers. The exponents in allometric equations that relate duration of the pre-nesting period with body mass are constant within a particular sex and differ between males and females. In different sexes, time spent for the pre-nesting period depends on mating, parental, and territorial systems. In sandpipers' males and females, this time is determined by the type of social organization. Relatively large sandpiper species seek to shortening of the pre-nesting period calendar time, which constrains their social organization. Monogamy and pair parental care lead to a necessity for spatial population structure to be controlled more strictly and maintained for a longer time. This, in turn, causes the increasing of males' time expenditures for such a behavior.
authors.forename: V V
authors.initials: VV
authors.lastname: Gavrilov
mesh_terms: D000818:Animals; D049628:Body Size; D046091:Charadriiformes / Q000502:physiology*; D003080:Cold Temperature; D005260:Female; D006608:Hierarchy, Social; D008297:Male; D015233:Models, Statistical; D009425:Nesting Behavior / Q000502:physiology*; D012098:Reproduction; D012621:Seasons; D012737:Sex Factors; D012726:Sexual Behavior, Animal / Q000502:physiology*; D012800:Siberia; D013731:Territoriality