1,721,238 research outputs found
Sand Martin (Riparia riparia) nesting place dynamics of Salaca riverside
No full textBakalaura darba „Krastu čurkstes (Riparia riparia) ligzdošanas vietu dinamika Salacas upes krastos” pētījuma ietvaros tika veikta Salacas krastos ligzdojošās krastu čurkstes koloniju uzskaite un dinamikas novērojumi.
Mērķa realizēšanai no 2007.–2013. g. tika apsekotas putnu kolonijas visā upes garumā un uzskaitītas, un raksturotas to ligzdošanas vietas, novērtēta alu apdzīvotība. Autors ir iepazinies ar zinātnisko literatūru par krastu čurkstes bioloģiju un ekoloģiju, izpētes teritoriju un veicamo darbu metodiku. Pēc uzskaites datiem ir izveidots kartogrāfiskais materiāls par čurkstes koloniju izplatību novērojumu periodā. Ir noteikti vides faktori, kas dažādos gados varēja ietekmēt koloniju izmaiņas.
Iegūtie rezultāti apkopoti bakalaura projekta darbā, kurš sastāv no ievada, 3 galvenajām nodaļām ar 17 apakšnodaļām, secinājumiem un 2 pielikumiem.
Atslēgas vārdi: krastu čurkste, Riparia riparia, Salaca, smilšakmens atsegumi, Ziemeļvidzemeas biosfēras rezervātsWithin the framework of research of the Bachelor Paper“Sand-Martin(Riparia riparia) nesting place dynamics of Salaca riverside”, sand-martin colonies nesting along the banks of the Salaca were recorded and their dynamics were observed.
To achieve the goal, from 2007 to 2013, there were bird colonies surveyed along the entire lengths of the river, and their nesting grounds were recorded and described, density of hole settlement was assessed. The author studied scientific literature on sand-martin biology and ecology, the area of research and methodology of the tasks to be performed. Cartographic material on distribution of the sand-martin colonies during the observation period is developed in accordance with the data recorded. There are environmental factors stated which could affect the changes of the colonies during different years. The results are summarized in the Bachelor Paper Project consisting of an introduction, 3main chapters and 17sub-chapters, conclusions and 2appendixes
The usual suspects: why techno-fixing dementia is flawed
No full textDementia is highly prevalent and up until now, still incurable. If we may believe the narrative that is currently dominant in dementia research, in the future we will not have to suffer from dementia anymore, as there will be a simple techno-fix solution. It is just a matter of time before we can solve the growing public health problem of dementia. In this paper we take a critical stance towards overly positive narratives of techno-fixes by placing our empirical analysis of dementia research protocols and political statements in a framework of technology assessment. From this perspective, it becomes obvious that a techno-fix is just one of many ways to approach societal problems and more importantly that technologies are way less perfect than they are presented. We will argue that this narrow scope, which focusses on the usual suspects for solving illnesses, reduces dementia to organismic aspects, and may be counterproductive in finding a cure for dementia. We conclude with outlining how the narrow scope can be balanced with other narratives and why we should have a reasonable scepticism towards the usual suspects
Modelling the size, width, and bending stiffness of Sand Martin feathers.
No full textModelling the size, width, and bending stiffness of Sand Martin feathers.</p
Unusual nesting of the sand martin Riparia riparia
No full textOn 6 August 2020, I found an unusual nesting site of the Sand Martin Riparia riparia – the nest was in the crack in the concrete wall of the canal in Warsaw about 5 meters above the
water surface and 40 meters from the Vistula bank (photo)
Fig. 5 in Sand martin (Riparia riparia) in the Czech Republic at the turn of the millenium
No full textFig. 5. Distribution of altitude of sand martin nestplaces in the Czech Republic. In discordance with previously published results, sand martins created numerous colonies in altitudes over 400 m a.s.l.Published as part of Heneberg, P., 2007, Sand martin (Riparia riparia) in the Czech Republic at the turn of the millenium, pp. 293-312 in Linzer biologische Beiträge 39 (1) on page 311, DOI: 10.5281/zenodo.540833
About the Parasitism of the Bird’s Blood Flies (Diptera, Hippoboscidae) on the Sand Martin (<i>Riparia riparia</i> (L., 1758)) in the European Part of Russia
Full text linkThe purpose of the research is to study of the species composition and frequency of occurrence of bird’s blood flies (Diptera, Hippoboscidae) parasitizing on sand martin (Riparia riparia (L., 1758)) in the European part of Russia.Materials and methods. The material for this work was the collection of bird’s blood flies, obtained by us during the ringing of sand martin in 2016–2018. The population of six sand martin colonies located along the banks of the Klyazma and Uvod rivers in the territory of the Kovrov region of the Vladimir region was examined. Birds were caught, blocking the entrance to the holes by spider nets. A total of 842 swallows were examined and ringed.Results and discussion. After examining 674 adults (349 males, 325 females) and 168 juveniles of sand martin, we found only two blood suckers Ornithomya avicularia (the frequency of occurrence of flies in birds is 0.2%). This type of bird’s blood flies is an unspecialized pleioxeny parasite. The results of our observations show that the parasitism of O. avicularia on the sand martin is extremely rare. Narrow-specific, monoxenous species of bird’s blood flies, parasitic on sand martin, were not found in the study area
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