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2012 | 47 | 2 |
Tytuł artykułu

No evidence for offspring sex ratio adjustment in Marsh Tits Poecile palustris breeding in a primeval forest

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Warianty tytułu
Brak dowodów na dostosowywanie proporcji płci potomstwa przez sikory ubogie gnieżdżące się w lesie pierwotnym
Języki publikacji
When production costs or fitness returns vary between sons and daughters, selection is expected to favor females that adjust sex ratios accordingly. However, to what extent birds can do so remains debatable. Here we analyze the secondary offspring sex ratios in Marsh Tits Poecile palustris breeding in the primeval, strictly protected, part of Białowieża National Park (north-eastern Poland). We collected data on parent birds (age), their breeding performance (laying dates, clutch size, nesting success), and the offspring sex ratio in two types of old growth habitats over three years. The individual broods varied from all male to all female, but no significant deviation from parity was detected at the population level. The inter-brood variation could be accounted for neither by environmental (season, habitat) nor parental (female age, laying dates, clutch size, and brood size) variables analyzed. The primary sex ratios (at laying) did not differ from the secondary (brood) sex ratios. Thus, there was no indication of post-hatching sex ratio adjustments, either. Together, our results do not support the hypothesis of adaptive sex ratio adjustments in the studied Marsh Tit population. We suggest that possible fitness benefits could be insufficient to exceed the costs conferred by sex ratio manipulation in this species.
W sytuacji, gdy koszty i zyski z posiadania synów i córek są różne, powinny być faworyzowane te samice, które będą w stanie odpowiednio dostosować płeć swojego potomstwa. W ostatnich latach wykazano, że samice niektórych gatunków ptaków różnicowały proporcję płci w lęgu w zależności od czynników środowiskowych lub cech swoich i partnera. Wiele badań nie potwierdziło jednak tego zjawiska. W pracy przeanalizowano proporcję płci w lęgach sikor ubogich, gnieżdżących się w pierwotnym lesie, w ściśle chronionej części Białowieskiego Parku Narodowego. Badania terenowe prowadzono w latach 2003-2005. Dane dotyczące wieku samicy, fenologii lęgów, wielkości zniesienia oraz udatności lęgów zbierano w dwóch typach lasu (grąd i łęg) zlokalizowanych na czterech powierzchniach badawczych. Poszczególne lęgi różniły się proporcją samców (Fig. 1), ale na poziomie populacyjnym proporcja płci wśród piskląt nie odbiegała od 1:1 (Tab. 1). Nie stwierdziliśmy, aby samice dostosowywały płeć potomstwa do przebadanych czynników środowiskowych (sezon, typ siedliska) ani też rodzicielskich (wiek samicy fenologia lęgu, wielkość zniesienia oraz liczba piskląt w lęgu) (Tab. 2). Pierwotna proporcja płci (w lęgach, w których pisklęta wykluły się ze wszystkich złożonych jaj) nie różniła się od proporcji w lęgach zredukowanych (liczba piskląt < liczba jaj), nie stwierdzono zatem większej śmiertelności piskląt/embrionów jednej z płci (Tab. 1 i 2).
Słowa kluczowe
Opis fizyczny
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  • Department of Forest Zoology and Wildlife Management, Warsaw University of Life Sciences - SGGW, Nowoursynowska 159, 02–776 Warsaw, Poland
  • Laboratory of Forest Biology, Wroclaw University, Sienkiewicza 21, 50–335 Wroclaw, Poland
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