1,720,974 research outputs found
Who am i? Testing I3S contour on the facial mask of the western polecat (mustela putorius)
No full textIndividual recognition of wild animals is a fundamental tool to acquire information about the structure and dynamics of animal populations. Recently, individual identification from camera trapping has been successfully applied to Capture-Mark-Recapture (CMR) studies in various taxa. We collected 281 photos of 48 specimens of Western Polecat (Mustela putorius) from various Italian Museums to test the capabilities of I3S contour software to automatically recognize different individuals from their facial mask. After selecting 52 high quality pictures from different specimens, we obtained a 100% success rate of correct individual identification. This suggested that both facial mask pattern and automatic identification might be successfully applied to the study of this highly elusive species through camera trapping
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
Strategie alternative alla disinfestazione con bromuro di metile su pomodoro in pieno campo
No full textAtt
First record of Bombina variegata (Linnaeus, 1758) in a cave environment
No full textSeveral species of amphibians are known to inhabit
subterranean habitats. While some species are obligatory
cave-dwelling (e.g., Proteus anguinus Laurenti, 1768),
others tend to use caves only for limited periods of their
lives (Peck, 1974; Romero, 2009). At least 17 species of
amphibians that belong to the Italian herpetofauna have
on occasion been found in caves or other underground
spaces and several of them occasionally breed in
subterranean sites. Here we provide the first evidence
of a population of yellow-bellied toads (Bombina
variegata) exploiting a subterranean habita
A surprising pattern of Sexual Dimorphism in the Eurasian otter (Lutra lutra) in Sweden
No full textSexual dimorphism is a very common strategy in polygamous mammals. In mustelids, sexual size dimorphism (SSD) is present in several species, while sexual shape dimorphism (SShD) is not as common. The Eurasian otter is a semiaquatic mustelid, exclusively feeding on aquatic prey, mainly fish, amphibians, and crustaceans. It is well-known that male otters tend to be larger, whereas information on SShD is contrasting. We used a 3D geometric morphometric approach to investigate SSD and SShD in three genetically distinct populations of otters located in Northern, Central and Southern Sweden. We analyzed 71 otter skulls (M=41, F=30), using photogrammetric techniques to produce 3D models of each skull, placing 30 3D landmarks on each model. We found that sexual dimorphism varies among populations. Neither SSD nor SShD occurred in the North, only SSD occurred in the Centre, and both SSD and SShD are present in the South of Sweden. Allometric trajectories of males and females from the North population differed from those of the other two populations. Our results highlighted a great variability in sexual dimorphism in Swedish Eurasian otters, that probably derives from different responses to prey availability and historical contingencies
Strategie alternative alla disinfestazione con bromuro di metile su pomodoro in pieno campo.
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