Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 4

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Somatochlora arctica
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
During studies on spiders of high peat bogs in Orawa - Nowy Targ Basin (southern Poland), a few larvae of two Soma- tochlora species were caught in Barber's traps. Larvae were found in traps situated by the edges of peat bogs, in places without isolated water bodies, in patches of damp Sphagnum. Somatochlora alpestris was caught in Puścizna Wielka (49°27'N, 19°46'E, UTM: DV 17) and Baligówka (49°28'N, 19°50'E, DV 18) peat bogs. Both localities are situated at the height of ca. 650 m above sea level. New data confirm the occurrence of the species in peat bogs in the Orawa - Nowy Targ Basin: the last record from 78 years ago was given by Fudakowski (1932). Taking into consideration small effectiveness of Barber's traps in collecting dragonflies, even so scarce material shows that S. alpestris can be present in the area numerously and in many sites, however, this needs to be verified on the field. This species does not react on climatic changes as Aeshna caerulea whose range of occurrence moved from 840 to ca. 1 400 m above sea level. Together with data about good condition of mountain populations of this species it proves the validity of shifting S. alpestris in the Red list of Dragonflies of Poland from EN category to NT. New locality of Somatochlora arctica is a nature reserve „Bór na Czerwonem" (49°27'N, 20°02'E, DV37). This site is important for the protection of this species for its acreage has become even more fragmented in Poland. Our data as well as random literature one (including the record of Coenagrion ornatum) indicate on the great significance of peat bogs of the Orawa - Nowy Targ for dragonfly protection. This area urgently needs to be adequately investigated.
The paper presents the results of studies conducted in Roztocze Upland (SE Poland) during the camp of Student Scientific Circle of Biologists of Maria Curie-Skłodowska University in July 2008. At 27 study sites, of which 13 were situated in the Roztoczański National Park, 37 dragonfly species were found (51% of the national fauna). The most interesting were: Sympecma paedisca, Nehalennia speciosa, Gomphus vulgatissimus and Ophiogomphus cecilia. 9 species have been recorded for the first time from the Roztoczański National Park, which elongated the list of well-known species to the number of 47. The study site of Nehalennia speciosa (Borowina near Józefów, Caricetum lasiocaropae on the edges of the water body between dunes) has been known for over 10 years. New data confirms the subsistence of the population and even the decrease in numbers: at least >1.000 specimens, juvenile imagines and development behaviour were observed. At the same time, the disappearance of the other population of N. speciosa was found – on a transitional peat-bog near the village Hamernia (last data from 2002). Perhaps the same refers to the population of Somatochlora arctica on a transitional peat-bog near the village Tarnowola (last data from 2003). Other examples of vanishing of peat-bog species on Roztocze due to drying out of habitats are also given. Perhaps we are witnessing the start of regress of this ecologic group which has not been endangered up till now. Data about Gomphidae has been analyzed by their rarity in the discussed region which is surprising for Roztocze is rich in rivers with suitable habitat structure and satisfactory water quality. The authors give two possible explanations responsible for this conditions: forest basin of the rivers (which results in shading and low pH among others) as well as strong fish stocking of Roztocze rivers by trout by Polish Angling Association.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.