2,397 research outputs found
Environment, biodiversity and rare species: analysis of factors affecting bat conservation.
No full textTo assess the conservation status of rare and threatened species it is necessary to have background information about their distribution, and population size and trends. While all these information are available for well-studied taxa, there is a lack of knowledge for other poorly studied species. Among Mammals, bats and rodents represent the orders with the larger than average percentage of Data Deficient species and information scarcity is one of the greatest threats to bats. The understanding and identification of key resources for bats is of vital importance for their conservation.
In the present study we analysed the main ecological requirements of some rare bat species during breeding, mating and hibernation in Varese province (Lombardy, N Italy).
The analyis of space use, activity pattern and resource selection during the breeding period was focused on a small colony of females Geoffroy’s bat (Myotis emarginatus), roosting in the town hall of a small city, through monitoring and radiotracking. The timing of birth was in the first days of July and lactation lasted for less than a month. After weaning animals abandoned the roost and in september they reached swarming/wintering sites. Geoffroy’s bat females exploited a restricted area, covering short distances during dispersion and between summer and wintering sites. Animals showed large home ranges without a centre of activity (core area), concentrating their foraging behaviour on mountain foothills on the interface between meadows and woodlands. The favourite preys were spiders, which formed three-quarters of arthropod fragments in bat droppings, followed by beetles, planthoppers, moths and mosquitoes. Lactating females appeared to use foraging areas located closer to the breeding site, although they didn’t nurse often the youngsters during the night: this may be better explained as a energy-saving behaviour during a period of high energetic constraint. Nightly activity pattern was the same for lactating and non reproductive females; they both showed an unimodal pattern, spending most of the time on the wing foraging, with a mean of 7 hours per night.
The analysis of swarming and roosting behaviour during hibernation was centered on the analysis of bat activity and the characterisation of roosts in twelve underground sites of Campo dei Fiori Regional Park through monitoring. These caves were swarming and hibernating sites for six species, one of which was the Geoffroy’s bat, a species not known to swarm. Swarming activity started at the end of August, after a rapid decrease in mean environment temperature, and peaked in September. For all species sex ratio during swarming was skewed toward males (1:3), and this bias was even stronger for Myotis emarginatus (7% females). Bat activity was highest in caves positioned at high elevation, showing large entrances, low hydrological activity and exposition toward south-sothwest. The undergroud sites most used by animals were long and deep caves or short and shallow hollows: the former show a structure and hence microclimate suited for both swarming and hibernation, while the latter should be less fit for hibernation due to poor conditions of isolation from the athmosferic agents.
Underground sites are key resources for bats, in relation to breeding, mating and hibernation, and their uneven distribution on the territory makes them used by a large number of bats that gather from a vaste area. In addition, bats show a high fidelity to single roosting sites, therefore the loss or deterioration of underground sites can result
in a complete loss of suitable roosting place at a large scale, thus affecting different bat populations that could be subject to a decrease and a genetic deterioration.
The two most abundant species in the caves of Campo dei Fiori Regional Park (Myotis emarginatus and M. nattereri) showed a positive trend during the last 11 years. This increase may be due to the protection efforts that has been put in bat conservation, but a longer data set is required to discern natural population fluctuations from real trends.
The understanding of ecological requirements of rare and threatened species is imperative for the enhancement of effective conservation programs and the identification of features that affect bat choice of roosts is important to make predictions about the areas suitable for bat presence in order to concentrate our efforts in identifying new important roosting areas
Rinolofo euriale, rinolofo maggiore, rinolofo minore, vespertilio di Bechstein, vespertilio di Blyth, vespertilio di Capaccini, vespertilio di Daubenton, vespertilio smarginato, vespertilio maggiore, vespertilio mustacchino, vespertilio di Natterer, pipistrello albolimbato, pipistrello di Nathusius, pipistrello nano, pipistrello pigmeo, nottola di Leisler, nottola comune, pipistrello di Savi, serotino di Nilsson, serotino comune, serotino bibolore, barbastello, orecchione bruno, orecchione meridionale, orecchione alpino, miniottero, molosso di Cestoni.
No full textMartina Drijverová and her literary works for children (author´s portrait)
No full textThis thesis Martina Drijverova and her literatur for children (the author´s portrait) is engaged in work of writer and screenwriter Martina Drijeverová. She is an excellent writer of literature for children. In the first part of this work her story writing is mentioned and the second part deals with her fairy-tale writing. The other author´s work written for children is in the third part. The conclusion of this thesis appreciates the author´s credit in literature for chidlren. Analysis of some books are available. The supplementary part is composed of autor´s biography and her photograph, some book covers, list of the autor´s work {--} televiews, radio plays and serials, audio tapes and CDs, stage plays, books written in Braille
HERStory Makers 2022: Martina Čagalj
No full textMartina Čagalj is a PhD candidate at the University of Split studying seaweeds as a potential source of bioactive compounds. She took part in HERStory Makers 2022.What is HERStory Makers?HERStory Makers is a social media competition for female-identifying early career researchers to share their research, their career journeys, and to inspire the next generation. Winners are selected by public vote. HERStory Makers is also part of EXPLORATHON, Scotland's contribution to European Researchers' Night.In 2022-23, EXPLORATHON was supported by the Engineering & Physical Sciences Research Council [grant number EP/X020894/1].Author contributions to contentMartina Čagalj conceived, planned, and recorded the video content. Kirsty Ross edited the video content to insert HERStory Maker credits, add subtitles, and maintain video length below Twitter/X limit of 2 mins and 20 secs, prior to scheduling the social media posts.</p
Application of an automatic classifier in bats bioacustic monitoring for wind farm assessment.
No full textWorking out Geoffroy’s bat (Myotis emarginatus) ecological requirements: the startup for conservation actions.
No full textFactors underlying migratory bat aggregations in chestnut groves
No full textDeciduous woodlands have undergone major structural changes in Europe in the course of the last century. Dense woodlands have, for instance, replaced traditionally managed, open sweet chestnut groves, and have led to biodiversity losses. Surveys carried out in the southern Alps have shown that the frequency of occurrence of the rare migratory Leisler’s bat Nyctalus leisleri in bat boxes is much higher in managed than in unmanaged chestnut groves, pointing to the importance of traditional groves as stopover sites. To identify the reasons for this habitat preference we investigated whether managed chestnut groves constitute a more appropriate foraging ground than closed stands, and whether bat boxes in managed chestnut groves offer more suitable temperature conditions for roosting. Foraging habitat selection and roost usage were investigated by means of radiotracking and temperature loggers, respectively. Foraging Leisler’s bats predominantly selected deciduous woodlands over other habitat types, but showed no distinct preference for either type of chestnut grove over other forest types. In managed chestnut groves, bats used cooler boxes than others available in the same habitat, but there was no difference in temperature between the boxes used in managed versus unmanaged groves. Our results provide no evidence that foraging opportunities or roost temperature dictate the forest-specific pattern of bat box occupancy. As an alternative explanation, we suggest that managed chestnut groves may represent optimal lekking arenas due to their open structure and high roost density. Whatever the reason for this habitat preference, partially maintaining traditional management, resulting in a semi-open, mosaic landscape, is likely key to maintaining chestnut groves attractive for this migratory bat
The role of data science in software development
No full textauthor: Martina WeberMasterarbeit Universität Innsbruck 201
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