Climate and ecological relationships in northern latitude ecosystems

2020 ◽  
pp. 75-88
Author(s):  
John L. Horn
Erdkunde ◽  
2020 ◽  
Vol 74 (1) ◽  
pp. 15-44
Author(s):  
Niels Schwab ◽  
Karolina Janecka ◽  
Ryszard J. Kaczka ◽  
Jürgen Böhner ◽  
Ram Prasad Chaudhary ◽  
...  

Insects ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 215
Author(s):  
Lilian de Oliveira Guimarães ◽  
Roseli França Simões ◽  
Carolina Romeiro Fernandes Chagas ◽  
Regiane Maria Tironi de Menezes ◽  
Fabiana Santos Silva ◽  
...  

Avian malaria parasites are widespread parasites transmitted by Culicidae insects belonging to different genera. Even though several studies have been conducted recently, there is still a lack of information about potential vectors of Plasmodium parasites, especially in Neotropical regions. Former studies with free-living and captive animals in São Paulo Zoo showed the presence of several Plasmodium and Haemoproteus species. In 2015, a pilot study was conducted at the zoo to collect mosquitoes in order to find out (i) which species of Culicidae are present in the study area, (ii) what are their blood meal sources, and (iii) to which Plasmodium species might they be potential vectors. Mosquitoes were morphologically and molecularly identified. Blood meal source and haemosporidian DNA were identified using molecular protocols. A total of 25 Culicidae species were identified, and 6 of them were positive for Plasmodium/Haemoproteus DNA. Ten mosquito species had their source of blood meal identified, which were mainly birds, including some species that were positive for haemosporidian parasites in the former study mentioned. This study allowed us to expand the list of potential vectors of avian malaria parasites and to improve our knowledge of the evolutionary and ecological relationships between the highly diverse communities of birds, parasites, and vectors present at São Paulo Zoo.


2005 ◽  
Vol 62 (6) ◽  
pp. 1076-1094 ◽  
Author(s):  
J. Matías Braccini ◽  
Bronwyn M. Gillanders ◽  
Terence I. Walker

Abstract Sources of variation in dietary composition were examined in the piked spurdog (Squalus megalops). The species is an opportunistic predator that consumes a wide range of prey items. When importance of prey was measured by weight or occurrence, S. megalops preyed largely on molluscs and teleosts. However, when number of prey was considered, the main items were crustaceans. A bootstrap analysis showed that considerable variability can be expected in the importance of prey items in the species' overall diet. Regional, seasonal, and ontogenetic differences in dietary composition were found, but there were no differences between mature and immature sharks or between males and females. The spatial and temporal variation in diet exhibited by S. megalops and the intrinsic natural variability of the dietary composition of this opportunistic predator suggest that studies that infer predator–prey interactions from overall diet are likely to miss information on the ecological relationships among species and thus account for only part of these interactions.


Anthropology ◽  
2021 ◽  

Animal sanctuaries are human-created spaces for the protection and care of animals rescued from conditions of violence, exploitation, neglect, or abuse by other humans. The contemporary institution of the animal sanctuary originated with the first sanctuaries established in the United States by animal protection activists in the early 1980s. Since then, activists have established hundreds more throughout the world. Individual sanctuaries typically focus their efforts on specific kinds of animals corresponding to the ways in which they are used or commodified by humans, such as farmed animals, companion animals, or wild animals used in entertainment and biomedical research, although others may focus on a specific species of animal, such as chimpanzees, horses, wolves, or elephants. Animal sanctuaries are a novel subject of ethnographic inquiry in anthropology and related social sciences, so “sanctuary studies” is currently a nascent but growing topical area of research. Despite the relatively small body of literature focused on animal sanctuaries, anthropologists and other social scientists investigating sanctuaries and related endeavors, such as wildlife rehabilitation centers, have already provided valuable insights into why and how humans have chosen to care for rescued or endangered animals and the new kinds of institutions and political ecological relationships that are generated by these practices, highlighting the varied and, at times, conflicting ideas about care, ethics, value, species difference, and animal subjectivity and agency that inform sanctuary work. This pioneering literature forms a rich foundation for future research.


Biologia ◽  
2017 ◽  
Vol 72 (2) ◽  
Author(s):  
Irena Bielańska-Grajner ◽  
Tomasz Mieczan ◽  
Anna Cieplok

AbstractPeat bogs play key roles in preserving the stability of ecological relationships, but are some of the fastest disappearing and most endangered ecosystems in Europe. The aims of this study were: (1) to compare the distribution, species richness, diversity, and density of rotifers in microhabitats of a raised bog; and (2) to verify the hypothesis that rotifer density and species composition are dependent on seasonal factors, moss moisture content, and the dominant species of mosses in the microhabitats. Sampling was done monthly from April to November in 2013–2014 in the bog Moszne in eastern Poland (51°27′28.7″ N, 23°07′15.8″ E). The microhabitats sampled included hummocks, slopes, and hollows. A total of 40 rotifer taxa were identified. The highest species richness occurred in the hollows (40), dominated by


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