Publications by authors named "Giulia Tessa"

Background: Given their sensitivity to environmental alterations, odonates act as reliable bioindicators to assess the effects of changes in freshwater ecosystems and associated terrestrial habitats. The region comprised between Lario and Brianza (Provinces of Como, Lecco and Monza and Brianza - Lombardy, N Italy) is one of the most urbanised of the Italian peninsula and large parts of its territory have been heavily altered, especially at low elevation. Despite this pervasive anthropogenisation, the area is still characterised by a considerable variety of freshwater habitats, possibly harbouring rich odonate communities, which, however, have been never thoroughly investigated.

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Infectious diseases can alter the demography of their host populations, reducing their viability even in the absence of mass mortality. Amphibians are the most threatened group of vertebrates globally, and emerging infectious diseases play a large role in their continued population declines. Viruses belonging to the genus are responsible for one of the deadliest and most widespread of these diseases.

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Article Synopsis
  • - Parasitic chytrid fungi pose a major risk to amphibians, leading researchers to develop non-lethal isolation techniques for studying these pathogens without harming the hosts.
  • - A modified protocol, called the RML protocol, utilizes toe clips and biopsies instead of euthanizing amphibians, allowing for a broader application across various species and locations.
  • - After a decade of use, the non-lethal RML protocol successfully isolated chytrids in 18% of cases, while a lethal method for tadpoles had a 43% success rate, greatly reducing harm to threatened amphibian populations.
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Article Synopsis
  • Globalized infectious diseases, particularly a fungus affecting amphibians, are leading to significant species declines around the world.* -
  • Whole-genome sequencing revealed that the source of this devastating fungal panzootic is linked to the Korean peninsula, specifically a lineage called ASIA-1.* -
  • The pathogen's emergence is traced back to the early 20th century, coinciding with increased global amphibian trade, highlighting East Asia as a key area for biodiversity and the origin of harmful lineages.*
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The identification of historic and contemporary barriers to dispersal is central to the conservation of endangered amphibians, but may be hindered by their complex life history and elusive nature. The complementary information generated by mitochondrial (mtDNA) and microsatellite markers generates a valuable tool in elucidating population structure and the impact of habitat fragmentation. We applied this approach to the study of an endangered montane newt, .

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Large body size of ectothermic species can be correlated with high life expectancy. We assessed the longevity of the World's largest chameleon, the Parson's chameleon Calumma parsonii from Madagascar by using skeletochronology of phalanges taken from preserved specimens held in European natural history museums. Due to the high bone resorption we can provide only the minimum age of each specimen.

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North America and the neotropics harbor nearly all species of plethodontid salamanders. In contrast, this family of caudate amphibians is represented in Europe and Asia by two genera, Speleomantes and Karsenia, which are confined to small geographic ranges. Compared to neotropical and North American plethodontids, mortality attributed to chytridiomycosis caused by Batrachochytrium dendrobatidis (Bd) has not been reported for European plethodontids, despite the established presence of Bd in their geographic distribution.

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Longevity and age at sexual maturity were estimated in two anurans from the arid Isalo Massif (southern-central Madagascar), the blue-legged frog (Mantella expectata) and the rainbow frog (Scaphiophryne gottlebei). Phalanges from 69 individuals of M. expectata and 38 individuals of S.

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Batrachochytrium dendrobatidis (Bd), the causative agent of the amphibian disease chytridiomycosis, is an important factor in the global decline of amphibians. Within Europe, animals that exhibit clinical signs of the disease have only been reported in Spain despite the pathogen's wide, but patchy, distribution on the continent. Recently, another occurrence of chytridiomycosis was reported in Euproctus platycephalus, the Sardinian brook newt, on the Mediterranean island of Sardinia, but without any evidence of fatal disease.

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