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Wyświetlanie 1-10 z 123
Tytuł:
Rodzime i egzotyczne żerdzianki, Monochamus spp. (Coleoptera, Cerambycidae) jako wektory węgorka sosnowca, Bursaphelenchus xylophilus
Native and exotic sawyer beetles, Monochamus spp. (Coleoptera, Cerambycidae) as the vectors of the pine wilt nematode, Bursaphelenchus xylophilus
Autorzy:
Kozłowski, M.W.
Powiązania:
https://bibliotekanauki.pl/articles/1024346.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
wektory nicieni
Monochamus
szkodniki roslin
owady
entomologia lesna
Bursaphelenchus xylophilus
lesnictwo
zerdzianka
wegorek sosnowiec
zamieranie drzew
monochamus spp.
natives vector
exotic vectors
bursaphelenchus xylophilus
pine stands
damage
Opis:
A review of present knowledge on the sawyer beetles, Monochamus spp. as the potential and actual vectors of, Bursaphelenchus xylophilus is given. The pine wilt nematode (PWN) can cause considerable damage of pine stands in Europe if it were imported here (lately appeared in Portugal) and distributed throughout the area. This may be accomplished by the natural vectors of the PWN – the pine sawyer beetles: (1) exotic, imported with the wood or (2) native, that had contacted the infected wood. Regarding these scenarios, biology, distribution and known relations to Bursaphelenhus nematodes are given. It is concluded, that despite the vector potential of native and exotic sawyer beetles, the pine wilt nematode will meet climatic obstacle to develop in central and northern Europe.
Źródło:
Sylwan; 2003, 147, 01; 24-34
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kotły wirowe w krajobrazie dolin rzecznych zachodniej Hiszpanii
Potholes in the Landscape of Western Spain River Valleys
Autorzy:
Lorenc, M.W.
Powiązania:
https://bibliotekanauki.pl/articles/1186756.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
krajobraz
dolina rzeczna
kocioł wirowy
Hiszpania
landscape
river valley
pothole
Spain
Opis:
Spectacular bed forms, eroded by flood flows, are a feature of the bare rock terraces and channels of some rivers cut into granitic rock in the districts of Salamanca, Cceras and Badajoz, W Spain. The bed forms comprise a range of pothole types which individually represent various stages in the evolution of mature potholes. Pothole evolution reflects the hydrodynamics of the erosion, by high velocity flood flows, of bedrock. They evolve in time and in concert with the evolution of the landscape. Initial shallow depressions deepen gradually into cylindrical forms as vertical erosion increases. As time passes, lateral erosion increases and leads to wider cylindrical forms which evolve into asymmetrical and bulbous forms. Second-order scouring leads to the development of minor decorative potholes, tunnels and niche caves in the large, mature potholes. Data on pothole geometry should complement the findings of other geomorphological studies on individual rivers and on regions. The pattern of pothole maturity in a particular river valley can be used as a measure of the "erosionalmaturity" of the valley in the following way. All other things being equal, a pothole pattern involving many immature forms should characterize "young" stages in the erosion of a bedrock surface and, conversely, a preponderance of mature pothole forms should be a feature of "older" stages. Knowing the proportions of the various pothole types in the three areas studied, this simple rule allows the following conclusions. (a) The Salor River valley represents a "young" erosional stage; immature pothole forms predominate and the largest potholes are sited close to the present river channel. (b) The present valley of the Tormes River displays a similar relatively "young" evolutionary stage. The positioning of the large mature potholes above the present river level suggests that the water level in this river was, for a considerable time in the past, higher than it is today. (c) The Jerte River valley represents, essentially, an "old" evolutionary stage overprinted by "younger" erosional event(s). However, in this case, the local geological structure - a series of parallel faults - played an important role in the development of some large sumps (F-type potholes) at the bases of waterfalls. In the evolutionary history of a river channel, pothole formation is rightly recognized as a most potent method of down cutting. At any given moment, however, they are a morphological detail. Other than recognizing the abrasion they reflect, they may tend to be ignored. However, their geometries may allow a point in the history of a river, i.e., its present maturity, to be precisely defined. In addition, the spatial locations of potholes in river valleys reveal past and seasonal water levels. This study in W Spain suggests that a more complete and quantitative knowledge of pothole development in the rivers of the region could profitably complement and refine the findings of other methods of geomorphological measurement.
Źródło:
Architektura Krajobrazu; 2007, 2; 50-56
1641-5159
Pojawia się w:
Architektura Krajobrazu
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 123

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