1,721,027 research outputs found
Controlled expression of avian pre-migratory fattening influences indices of innate immunity
No full textDataset paper "Controlled expression of avian pre-migratory fattening influences indices of innate immunity" by Marcin Tobolka, Zuzanna Zielińska, Leonida Fusani, Nikolaus Huber, Ivan Maggini, Gianni Pola, and Valeria Marasco. Published by The Company of Biologists Ltd | Biology Open (2024) 13, bio060018. doi:10.1242/bio.060018</p
Datasets and codes to Pastres et al. ICB, 2024
No full textDatasets and codes used in the study:
Maia Pastres, Ivan Maggini, Massimiliano Cardinale, Leonida Fusani, Andrea Ferretti, Sleep Posture Influences Metabolic Rate and Vigilance in the Common Whitethroat (Curruca Communis), Integrative and Comparative Biology, 2024;, icae031, https://doi.org/10.1093/icb/icae03
Stopover behaviour of migratory songbirds at a small desert oasis in Southern Morocco
No full textDiplomarbeit - Veterinärmedizinische Universität Wien - 2025Jedes Jahr ziehen Millionen von Zugvögeln von ihren Brutstätten in Europa über das Mittelmeer und die Sahara Wüste zu den Überwinterungsstätten in Subsahara-Afrika und zurück. Im Frühjahr folgt auf die Migration die Paarungszeit, sodass ein engergie-effizienter Zug oder ein möglichst frühesr Ankunftsdatum im Brutgebiet entscheidende Fitness-Vorteile für ein Individuum bringen können. Je nach Spezies und Individuum nutzen die Vögel verschiedene Zugstrategien. Die meisten davon beeinhalten mindestens einen intermediären Aufenthalt, einen sogenannten Stopover, um zu rasten und aufgebrauchte Energiereserven aufzufüllen. Je nach Jahreszeit, Spezies, Zugstrategie und individuellen Faktoren nutzen Vögel verschiedene Stopover Sites und verhalten sich dort unterschiedlich. Das Ziel der vorliegenden Diplomarbeit war es, das Stopover-Verhalten von ziehenden Singvögeln in einer Oase in der Sahara Wüste zu dokumentieren und zu ermitteln, welche Strukturen sie nutzen und welchen Einfluss externe Faktoren auf das Verhalten haben. Dafür führten wir im Frühjar 2024 Verhaltensbeobachtungen in der Yasmina Oase nahe Merzouga im Süden Marokkos durch. Wir beobachteten zufällig ausgewählte Tamarisken in der Oase und notierten alle Vögel, die sich im Beobachtungszeitraum im Baum aufhielten sowie deren Verhalten. Das Auftreten der einzelnen Spezies und unserer drei Verhaltenskategorien (Nahrungssuche, Bewegung und Rasten) verglichen wir mit Daten zu Temperatur, Windstärke, Datum, Tageszeit und Eigenschaften des Baumes. Die Ergebnisse bestätigen die Funde von Maggini et. al. (1) – wir beobachteten die Zugvögel am meisten bei der Nahrungssuche, aber sie ruhten vermehrt während der Mittagszeit, hohen Umgebungstemperaturen oder bei starkem Wind. Ausserdem nutzten sie bevorzugt hohe Bäume mit hoher Blattdichte.Diploma thesis - University of Veterinary Medicine Vienna - 2025Every year millions of migratory birds travel from their breeding grounds in Europe across the Mediterranean Sea and Sahara Desert to their wintering grounds in Sub-Saharan Africa and back. In spring, breeding season follows the northward migration, so an energy-efficient migration or early arrival date at the breeding grounds can prove advantageous for an individual to ensure a successful breeding season. Depending on species and individual factors birds use different migration strategies. Most of these strategies include at least one stationary period, a stopover, to rest and refuel depleted energy reserves. The goal of this thesis was to determine the stopover behaviour of migratory songbirds at a small desert oasis in the Sahara Desert, what structures of the local vegetation they used and to investigate how external factors affected this behaviour. To do so we conducted behavioural observations at the Yasmina oasis near Merzouga in Southern Morocco during the spring of 2024. We surveyed randomly selected tamarisks in the oasis and noted all birds that stayed in this tree during our observation session as well as their behaviour. We compared the occurrences of the different species and our three behavioural categories (Foraging, Movement or Resting) with data on temperature, wind, date, daytime and the characteristics of the tree. The results confirmed findings from Maggini et. al. (1) – we observed the most birds foraging, but they showed more resting behaviour during midday, at high temperatures or strong winds. Additionally, they preferably used high trees with a dense foliage cover
Sequential mountings of a possible immature male by an adult male in Victoria\u27s Riflebird (Ptiloris victoriae).
No full textFew studies have offered detailed descriptions of copulatory behaviours in the birds of paradise (family Paradisaeidae) and systematic investigations of their sexual behaviours are rare. We recorded courtship behaviours of Victoria\u27s Riflebird Ptiloris victoriae in the Atherton Tablelands in Queensland, Australia using motion triggered cameras and report a rare case of three sequential mountings by an adult-plumaged male. While the recipient of these mountings performed female-typical sexual behaviours, it also briefly performed a male courtship display behaviour, suggesting that it may be an immature male. This observation raises several questions about the courtship behaviour of this species. Females may, for instance, occasionally solicit multiple copulations from preferred males to maximize the amount of transferred sperm. Another intriguing possibility is that immature males tolerate being mounted and potentially even mimic female sexual behaviours when learning from the displays of adult males. We also describe a novel adult male sexual behaviour, namely \u27nape-pecking\u27
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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