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Documents disponibles écrits par cet auteur (21)
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Article
Piotr Indykiewicz, Auteur ; Dariusz Jakubas, Auteur ; Julita Gerke, AuteurMany vertebrates exhibit a diel activity, steered by light–dark cycle. However, some colonial waterbirds, in that several species of gulls, are active not only in day hours but also at night. In this study, we aimed to investigate 24 h cycle of [...]
Article
Izabela Kulaszewicz, Auteur ; Katarzyna Wojczulanis‐Jakubas, Auteur ; Dariusz Jakubas, AuteurReproduction is a demanding phase of bird's life cycle and imposes various physiological challenges. Increasing oxidative stress (OS) has been proposed as one of the costs associated with reproduction. In this study, we investigate the level of [...]
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 ; 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
Brygida Manikowska-Slepowronska, Auteur ; Krzysztof Slepowronski, Auteur ; Dariusz Jakubas, AuteurEstimating the productivity of colonial waterbirds can have important conservation and management implications. For tree-nesters, investigators must climb nest trees to obtain productivity data. In this study, we employed indirect inspection of [...]
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
Izabela Kulaszewicz, Auteur ; Dariusz Jakubas, AuteurA majority of Eurasian short-distance migrants moult after breeding and before autumn migration, while most long-distance migrants perform a winter moult in the tropics after autumn migration. Another strategy among long-distance migrants is a p[...]
Article
Dariusz Jakubas, Auteur ; Brygida Manikowska, AuteurCapsule Herons responded to the lower abundance of a preferred fish by switching prey. Aims To investigate how Grey Herons respond to the decline in abundance of a preferred fish, the Round Goby Neogobius melanostomus. Methods Grey Herons Ardea [...]
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
Katarzyna Wojczulanis, Auteur ; Dariusz Jakubas, Auteur ; Wojciech Walkusz, Auteur ; Liv Wennerberg, AuteurSex differences in the quality and quantity of food loads brought to little auk (Alle alle) chicks were investigated in a large colony in Hornsund (South Spitsbergen). Adults returning to the colony were caught in mist-nets and food loads were 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 ; 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 ; Brygida Manikowska-Slepowronska, AuteurHuman-caused disturbances affect, e.g., the spatial distribution and breeding performance of most organisms, including birds. Here, we assessed the response of Grey Herons (Ardea cinerea) to frequent human disturbance in a large heron colony in [...]
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 [...]
