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Article
Marion Devogel, Auteur ; Rozenn Le Fur, Auteur ; Antoine Grissot, Auteur ; Dorota Kidawa, Auteur ; Marcelo Araya-Salas, Auteur ; Katarzyna Wojczulanis-Jakubas, AuteurIn species with biparental care, coordination of parental activities can have important fitness consequences. However, specific behavioral mechanism allowing the coordination of breeding partners remains largely unexplored. Prevalence of biparen[...]
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Katarzyna Wojczulanis-Jakubas, Auteur ; Adrianna Kilikowska, Auteur ; Jérôme Fort, Auteur ; Maria Gavrilo, Auteur ; Dariusz Jakubas, Auteur ; Vicki Friesen, AuteurIdentifying natural populations that might be considered separate units using morphology, genotype or both is important in understanding the process of speciation and for conservation. We examined the relationships between the only two subspecie[...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Dariusz Jakubas, Auteur ; Anna Kośmicka, AuteurABSTRACT Examining body mass and physiological parameters in breeding adults may provide valuable insight into parental efforts provided by males and females at a given stage of breeding. Here, we examined body mass and physiological variables ([...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Jakub Wietrzykowski, Auteur ; Dariusz Jakubas, AuteurAcoustic playback has been shown to substantially increase the number of birds trapped. However, other effects of playback have rarely been investigated; the few studies that have been published strongly suggest that when playback is applied som[...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Adrianna Kilikowska, Auteur ; Jérôme Fort, Auteur ; Maria Gavrilo, Auteur ; Dariusz Jakubas, Auteur ; Vicki Friesen, AuteurIdentifying natural populations that might be considered separate units using morphology, genotype or both is important in understanding the process of speciation and for conservation. We examined the relationships between the only two subspecie[...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Adrianna Kilikowska, Auteur ; Jérôme Fort, Auteur ; Maria Gavrilo, Auteur ; Dariusz Jakubas, Auteur ; Vicki Friesen, AuteurIdentifying natural populations that might be considered separate units using morphology, genotype or both is important in understanding the process of speciation and for conservation. We examined the relationships between the only two subspecie[...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Dariusz Jakubas, Auteur ; Lech Stempniewicz, AuteurThe evolution of sex-specific reproductive behavior among species with biparental care promotes sexual conflict over care. Such conflict may be less intense in species with long-term pair bonds. We examined sex-specific patterns of care during t[...]
Article
Dariusz Jakubas, Auteur ; Katarzyna Wojczulanis-Jakubas, Auteur ; Lech Iliszko, Auteur ; Miroslaw Darecki, Auteur ; Lech Stempniewicz, AuteurEnergy and time allocation differs between incubation and chick-rearing periods, which may lead to an adjustment in the foraging behaviour of parent birds. Here, we investigated the foraging behaviour of a small alcid, the little auk Alle alle d[...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Piotr Minias, Auteur ; Krzysztof Kaczmarek, Auteur ; Tomasz Janiszewski, AuteurWe examined the brood sex ratio and offspring body mass in relation to the timing of breeding and brood size in the Great Cormorant Phalacrocorax carbo sinensis. The brood sex ratio was not related to brood size but it was significantly related [...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Dariusz Jakubas, Auteur ; Anna Kośmicka, Auteur ; Jens-Kjeld Jensen, Auteur
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Dariusz Jakubas, AuteurSexual size dimorphism was examined in 273 immature Sedge Warblers (Acrocephalus schoenobaenus) caught in northern Poland during autumn migration in 2008 and 2009. Each individual was measured (wing, tail, head to bill, bill length, bill width, [...]
Article
Dariusz Jakubas, Auteur ; Katarzyna Wojczulanis-Jakubas, AuteurMost seabirds have a small clutch size. Thus, replacement of a clutch after loss can make important contributions to an individuals lifetime reproductive success. However, in the condition of short polar summer, relaying propensity may be time-c[...]
Article
Dariusz Jakubas, Auteur ; Katarzyna Wojczulanis-Jakubas, Auteur ; Radoslaw Kreft, AuteurIncubation may be an important component of reproductive costs, and birds can spend considerable amount of energy during this period. We investigated how the stress associated with incubation affects hematological parameters (proportion of leuko[...]
Article
Izabela Kulaszewicz, Auteur ; Dariusz Jakubas, Auteur ; Katarzyna Wojczulanis-Jakubas, AuteurDetermining an individual's sex is often difficult in species with monomorphic plumage, but it is important in many ecological studies. This study proposes a logistic function for sexing the Savi's Warbler, Locustella luscinioides, based on stan[...]
Article
Izabela Kulaszewicz, Auteur ; Katarzyna Wojczulanis-Jakubas, Auteur ; Dariusz Jakubas, AuteurBreeding season is the most energetically and physiologically demanding phase in the avian annual cycle, challenging adults' physiology and survival. However, the timing and extent that self-maintenance of breeding adults is compromised during t[...]
Article
Katarzyna Wojczulanis-Jakubas, Auteur ; Dariusz Jakubas, Auteur ; Dorota Kidawa, Auteur ; Anna Kośmicka, AuteurIn a number of species with biparental care, the parents of one sex desert the mate and brood before the chick is independent. The reasons for this desertion are poorly understood. In the study reported here we investigated whether sex-specific [...]
