The Development of the Macrozoobenthos in the River Rhine in Germany during the 20th Century

1994 ◽  
Vol 29 (3) ◽  
pp. 21-28 ◽  
Author(s):  
Thomas Tittizer ◽  
Franz Schöll ◽  
Maria Dommermuth

The development of the zoobenthic biocoenosis in the River Rhine in Germany during the 20th century has been documented in literature and by own investigations. The diversity of species and the structure of zoocoenosis are the elements of comparison. They show a drastic and continuing impoverishment in the benthic macroinvertebrate fauna throughout the 1950s, 1960s, and in the early 1970s. Since the raid-seventies a steady recovery of the communities has been observed. Causal dependencies between the development of the zoocoenosis and environmental factors like water pollution, river training, navigation and invasion of alien species (Neozoa) are discussed. Actions for improving the ecological situation are proposed.

2008 ◽  
Vol 42 (5) ◽  
pp. 894-906 ◽  
Author(s):  
Jukka Aroviita ◽  
Esa Koskenniemi ◽  
Juho Kotanen ◽  
Heikki Hämäläinen

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Minwoo Oh ◽  
Yoonjeong Heo ◽  
Eun Ju Lee ◽  
Hyohyemi Lee

Abstract Background As trade increases, the influx of various alien species and their spread to new regions are prevalent, making them a general problem globally. Anthropogenic activities and climate change have led to alien species becoming distributed beyond their native range. As a result, alien species can be easily found anywhere, with the density of individuals varying across locations. The prevalent distribution of alien species adversely affects invaded ecosystems; thus, strategic management plans must be established to control them effectively. To this end, this study evaluated hotspots and cold-spots in the degree of distribution of invasive alien plant species, and major environmental factors related to hot spots were identified. We analyzed 10,287 distribution points of 126 species of alien plant species collected through a national survey of alien species using the hierarchical model of species communities (HMSC) framework. Results The explanatory and fourfold cross-validation predictive power of the model were 0.91 and 0.75 as area under the curve (AUC) values, respectively. Hotspots of invasive plants were found in the Seoul metropolitan area, Daegu metropolitan city, Chungcheongbuk-do Province, southwest shore, and Jeju Island. Hotspots were generally found where the highest maximum summer temperature, winter precipitation, and road density were observed. In contrast, seasonality in temperature, annual temperature range, precipitation during summer, and distance to rivers and the sea were negatively correlated to hotspots. The model showed that functional traits accounted for 55% of the variance explained by environmental factors. Species with a higher specific leaf area were found where temperature seasonality was low. Taller species were associated with a larger annual temperature range. Heavier seed mass was associated with a maximum summer temperature > 29 °C. Conclusions This study showed that hotspots contained 2.1 times more alien plants on average than cold-spots. Hotspots of invasive plants tended to appear under less stressful climate conditions, such as low fluctuations in temperature and precipitation. In addition, disturbance by anthropogenic factors and water flow positively affected hotspots. These results were consistent with previous reports on the ruderal and competitive strategies of invasive plants, not the stress-tolerant strategy. Our results supported that the functional traits of alien plants are closely related to the ecological strategies of plants by shaping the response of species to various environmental filters. Therefore, to control alien plants effectively, the occurrence of disturbed sites where alien plants can grow in large quantities should be minimized, and the waterfront of rivers must be managed.


Author(s):  
Wheeler Winston Dixon

This chapter provides a background on Terence Fisher's career that is regarded by most as that of a journeyman director and by French critics that argued that Fisher was a master filmmaker since the 1950s. It looks at the efforts of David Pirie and others who brought about the first serious critical appraisal of Fisher's work beginning in the late 1960s. It also describes Fisher as the greatest Gothic filmmaker of the second half of the 20th century and British equivalent in terms of style and seriousness of the great American myth-master, John Ford. The chapter mentions The Curse of Frankenstein, in which Fisher creates a real, believable world, and does superb work with Peter Cushing, Christopher Lee, and the other members of the cast. It talks about Fisher's admission toward the end of his life about he had very little affection for science fiction.


Author(s):  
Nicole L. Pacino

César Moscoso Carrasco (1904–1966), a central figure in Bolivia’s mid-20th-century public health system, wanted to liberate Bolivia from malaria. In a career that spanned three decades, he came close to achieving this goal, but ultimately did not live to see successful eradication. Moscoso was one of the first Bolivian public health specialists in malariology, and was recognized by the World Health Organization for his contributions to the field in 1963. At all stages of his career, he fortuitously aligned himself with the individual or organization that could help him accomplish his professional ambitions and his mission of eradicating malaria in Bolivia. He was the founder and director of the National Anti-Malaria Service in 1929, where he made a name for himself working to halt the spread of malaria in Mizque, in the Cochabamba region. In the 1940s, he secured a position with the Rockefeller Foundation, where he had access to resources beyond the scope of the Bolivian government and an international network of public health specialists. Finally, in the 1950s, he headed the newly formed National Service for Malaria Eradication, which was a Bolivian government initiative supported by international organizations, such as the World Health Organization and the Pan-American Sanitary Bureau. In the 1950s and 1960s, he came the closest to achieving his goal. Unfortunately, he died the same way he lived: fighting a disease, possibly malaria, which he contracted on a visit to Ceylon as a malaria expert and consultant. Moscoso’s life is a window into many aspects of Bolivia’s 20th-century history. First, his life story illustrates both the potential and limitations of the Bolivian healthcare system. Indeed, Moscoso often had to work with international or binational organizations to accomplish the work that he saw as necessary and important. Second, his career shows how political changes in Bolivia impacted healthcare. Since his career spans the Chaco War of 1932–1935, the politically tumultuous 1940s, and the 1952 National Revolution, it provides a personal account of how these events changed healthcare in Bolivia. His story demonstrates the hardships that Bolivian doctors faced as they worked to improve their healthcare system, including low pay, few resources, and little respect from their foreign colleagues.


Tempo ◽  
1995 ◽  
pp. 2-11
Author(s):  
Calum MacDonald

Italian masters seem habitually to survive to a ripe old age. The proverbial example is Verdi, dying at 87, but Gianfrancesco Malipiero had turned 91 by his death in 1973, and his longevity has now been equalled, and seems likely to be surpassed, by Goffredo Petrassi. Long an eminent and respected figure in Italian musical life, and routinely named in the reference books as a significant 20th-century composer, Petrassi has never been well known in this country. His international reputation was at its height in the 1950s and 60s, and probably reached its apogee here with the London premiere, in 1957, of his Sixth Concerto for Orchestra, commissioned by the BBC for the 10th anniversary of the Third Programme. During those decades he travelled, conducted and adjudicated widely; he was closely associated with the ISCM (and was its President in the years 1954–56); as Professor of Composition at the Conservatorio di Santa Cecilia in Rome, he exercised a powerful influence on his country's musical life. He is especially celebrated as a teacher: his Italian pupils have included Aldo Clementi, Riccardo Malipiero, the film composer Enrico Morricone and the conductor Zoltán Pesko, but composers of many nations have studied with him. Among his British pupils, one need only instance Peter Maxwell Davies, Cornelius Cardew, and the late Kenneth Leighton to see that his teaching was never stylistically prescriptive.


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