Počet záznamů: 1

Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus

SYSNO ASEP	0024396
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve SCOPUS
Název	Should males come first? The relationship between offspring hatching order and sex in the black-headed gull Larus ridibundus
Překlad názvu	Měli by se samci líhnout první? Vztah mezi pořadím líhnutí a pohlavím u racka chechtavého (Larus ridibundus)
Tvůrce(i)	Ležalová, R. (CZ) Tkadlec, Emil (UBO-W)_{RID, ORCID, SAI} Oborník, M. (CZ) Šimek, J. (CZ) Honza, Marcel (UBO-W)_{RID, SAI, ORCID}
Zdroj.dok.	Journal of Avian Biology. - : Wiley - ISSN 0908-8857 Roč. 36, č. 6 (2005), s. 478-483
Poč.str.	6 s.
Jazyk dok.	eng - angličtina
Země vyd.	GB - Velká Británie
Klíč. slova	black-headed gull ; egg sequence
Vědní obor RIV	EG - Zoologie
CEP	GD206/05/H012 GA ČR - Grantová agentura ČR
CEZ	AV0Z60930519 - UBO-W (2005-2011)
EID SCOPUS	28044444290
DOI	10.1111/j.0908-8857.2005.03466.x
Anotace	In birds with hatching asynchrony, chicks hatched earlier and later in the laying sequence usually suffer different mortalities due to uneven abilities to compete for food, especially in poor years. If sexes differ in vulnerability to environmental conditions, e.g., by having different food requirements due to differential growth rates, mothers can increase fitness by allocating sex according to the laying order, producing less vulnerable sex later rather than early in the clutch. By analysing variation in primary sex ratio using a PCR-based DNA technique, we tested this prediction in black-headed gull Larus ridibundus chicks where males may be the less viable sex under adverse conditions. The overall primary sex ratio of the population did not depart from parity. However, first hatched chicks were more likely to be males whereas last hatched chicks were more likely to be females. Both egg volume and hatchling body mass decreased with laying order irrespective of sex.
Pracoviště	Ústav biologie obratlovců
Kontakt	Hana Slabáková, slabakova@ivb.cz, Tel.: 543 422 524
Rok sběru	2006

Počet záznamů: 1