1,721,024 research outputs found
Emissioni sonore ed ecologia.
No full textCDROM con video e suoni sui mammiferi marini e libretto accompagnatorio. L'autore ha curato la preparazione dei suoni e la redazione di un capitolo esplicativo con spettrogrammi
Monitoring habitat use of common bottlenose dolphins (Tursiops truncatus) and boat traffic using Passive Acoustic Monitoring devices in a marine protected area
Full text linkThe Mediterranean Tursiops truncatus subpopulation has been classified as Vulnerable on the IUCN Red List because of its decline. This species in coastal areas is exposed to a wide variety of threats: directed kills, bycatch, reduced prey availability caused by environmental degradation and overfishing, habitat degradation including disturbances from boat traffic and noise. Despite the increase in boat traffic in the Mediterranean Sea, the effect on T. truncatus’ habitat use has been studied in little detail and few data have been published. This study represents the first attempt to characterise spatial and temporal habitat use by T. truncatus and its relation to boat traffic in the Isole Pelagie Marine Protected Area (Italy) on the basis of an originally developed passive acoustic monitoring system (PAM). The devices were deployed in 2 areas in the southern waters of Lampedusa, during 2 separate years (2006 and 2009), each time for 3 months (from July to September) and in 6 time slots (3 diurnal and 3 nocturnal). Acoustic analysis showed that T. truncatus used the Southern coastal area of Lampedusa independently of the year, primarily during the early summer, a period coinciding with the peak of calving season. Dolphin occurrences appeared independent of boat traffic, with the exception of the smallest temporal scale (time slots): dolphin occurrences were more prevalent during the night when the level of boat traffic was lower. This study provides evidence on T. truncatus habitat use in the Mediterranean Sea and reveals that boat traffic could be one of the factors influencing it, thus stressing the need for further detailed investigation regarding this topic
Software and hardware sound analysis tools for field work.
No full textdescription of hardware and software tools developed to record underwater sounds made by marine mammal
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
Stima acustica della crescita di un capodoglio (Physeter macrocephalus Linneaus, 1758) ricatturato in Mar Ligure
No full textstima delle dimensioni di un capodoglio ricatturato tramite fotoidentificazione in Mar Ligure a distanza di un anno e stima della crescita attraverso l'analisi della struttura dei segnali emessi (misura dell'Inter Pulse Interval
Rilievi acustici sul capodoglio (Physeter macrocephalus) nel Mar Mediterraneo Centrale
No full textSintesi dei rilievi acustici effettuati per studiare il capodogli nel Mediterraneo Centrale
Software tools for real-time IPI measurements on sperm whale sounds.
No full textdescription of a software tool to measure the Inter-Pulse-Interval in sperm whale clicks to estimate the size of the emitting animal. A real-time cepstrum based technique is described and demonstrated
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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