Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Ograniczanie wyników
Czasopisma help
Lata help
Autorzy help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 91

Liczba wyników na stronie
first rewind previous Strona / 5 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  Oligochaeta
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 5 next fast forward last
EN
Studies were performed on 25 karstic springs located in Southern Poland (50 degrees 10 - 50 degrees 46' N, 19 degrees 17' - 19 degrees 54'E). They are natural or encased, differing also in discharge rate (0.01-15 l s^-1 in the southern part of Kraków-Częstochowa Upland while 20 - 1440 l s^-1 in its northern part) and kind of bottom sediments (fine or coarse). 27 species and l genus representing 5 families were determined, among them Enchytraeidae were represented by the highest number of species whereas Tubificidae (mainly juvenile forms) were the most abundant. Among oligochaetes no crenobionts were found while crenophiles: Rhyacodrilus falciformis Bretscher and Stylodrilus heringianus Claparede were present in a half of the studied springs. In the majority of the studied springs the density of oligochaetes was significantly higher in fine sediments (ranges 200 - 13 200 ind. m^-2) than in coarse ones (ranges 22-7900 ind. m^-2) (P <0.05). The species diversity (H') was also higher in in fine sediments, especially in springs of the southern part of Upland. Oligochaeta were more abundant and diversified in encased springs than in natural ones and they inhabited preferably fine sediments. The discharge and springs localization (in southern or northern part of the studied area) were found to be not of importance for oligochaete composition and abundance.
2
Content available remote Novel Polish recordings of rare aquatic Oligochaeta species
80%
EN
Two oligochaete species from the family Tubificidae: Peipsidrilus pusillus and Tubifex blanchardi, not previously reported from Poland, were found in the limnic part of the Włocławek Dam Reservoir. P. pusillus is known from lakes in Northern Europe and from a brook in the Czech Republic, while Tubifex blanchardi is known from fresh- and brackish waters, primarily strongly polluted waters, in North Africa and Southern Europe. Remarks on the distribution of Bothrioneurum vejdovskyanum, a species rarely found in Poland, are also included.
3
Content available remote Reproduction of Potamothrix hammoniensis (Oligochaeta) in shallow eutrophic lakes
80%
EN
The aim of the study was to indicate the abiotic parameters of water and bottom sediments, which significantly affect the reproduction of Potamothrix hammoniensis in 9 shallow eutrophic lakes, of which 5 were dominated by macrophytes and 4 – by phytoplankton. Samples were collected once a month from January to December 2012. The percentage of Potamothrix hammoniensis individuals with a developed reproductive system varied in individual lakes and ranged from 14 to 72%. There was no correlation between the distinguished lake types and the proportion of sexually mature individuals. The reproductive activity was not observed in summer and early autumn. Among the measured parameters, the highest values of the Pearson correlation coefficient were found between the percentage of individuals with a developed reproductive system and the conductivity (r = 0.69; p < 0.001), pH (r = 0.51; p = 0.002) and the organic matter content in the sediments (r = −0.42; p = 0.012). It is worth noting that there was no correlation between the percentage of sexually mature specimens and the water temperature (r = −0.22, p = 0.204) and the oxygen concentration (r = −0.08; p = 0.648).
EN
The studies were carried out on 9 sites situated between 10 and 337 km of the river course to asses which parameters are the most important for the composition and density of oligochaete taxocens. 42 species and 4 genera of oligochaetes were found. Considering number of species (24) and number of specimens Naididae were the most numerous, Tubificidae were less frequent (12 species), other families were represented by a few taxa. In the studied sector of the Vistula the natural taxocens of oligochaetes did not exist. Various reasons were responsible for these modifications: eutrophication (sites 2, 3), strong pollution (from site 5 downstream) and hydrotechnical structures (sites 1, 4, 6). The natural changes of oligochaetes density connected with their life cycles were modified by the effects of flood and water pollution.
EN
The earthworms occurrence in pine forests was analyzed. The communities of earthworms in studied areas are characterized by poor species composition and low density. D. octaedra was the dominant.
PL
Badano zgrupowania dżdżownic w borach świeżych wchodzących w sklad pięciu kompleksów leśnych. Stwierdzono występowanie czterech gatunków Lumbricidae. Gatunkiem dominującym była D. octaedra. Zagęszczenie analizowanych zgrupowań wahało się od 0 do 18 osobn./m2. Z porównania z danymi Innych autorów odnoszącymi się do zgrupowań Lumbricidae borów sosnowych Polski oraz Europy wynika, że istnieją pewne różnice w składzie gatunkowym i strukturze dominacji. Występują one w zgrupowaniach z borów sosnowych na nietypowych siedliskach i zależnie od wieku drzewostanu. Stwierdzane niekiedy zwiększenie liczebności dżdżownic w borach sosnowych należy wiązać z korzystniejszymi warunkami wilgotnościowymi lub pojawieniem się lepszego pokarmu w postaci bardziej przyswajalnej ściółki.
EN
The structure of Enchytraeidae communities of Leucobryo-Pinetum and Peucedano-Pinetum pine forests was analysed. One community-type was registered. Differences in species composition and dominance structure related to regional phytosociological diversity and limiting influence of anthropogenous pressure on community density were observed.
PL
Badaniami objęto strukturę zgrupowań Enchytraeidae w sosnowych borach świeżych Peucedano-Pinetum i Leucobryo Pinetum położonych w pięciu różnych regionach Polski. Stwierdzono występowanie 17 gatunków. Analiza składu gatunkowego, stałości i wierności występowania poszczególnych gatunków, struktury dominacji oraz diagram podobieństw wykazały istnienie jednego zgrupowania Enchytraeidae w borach świeżych. Charakteryzuje się ono wysokądominacją C. sphagnetorum. W skład trzonu tego zgrupowania wchodzą także M. pelicensis 1 A. eiseni. Nie stwierdzono różnic w frekwencji gatunków w próbach z różnych płatów roślinności. Średnie zagęszczenie wahało się od 11 780 do 29 260 osob./m2. Przeprowadzona analiza rozmieszczenia pionowego Enchytraeidae w zależności od typu gleby, ściółki i w różnych płatach roślinności nie wykazała znaczących różnic ilościowych. Istnieją natomiast różnice w stratyfikacji pionowej poszczególnych gatunków. Bory Leucobryo-Pinetum charakteryzują się większym bogactwem gatunkowym niż Peucedano-Pinetum. Stopień nasilenia antropopresji w badanych borach nie ma wpływu na strukturę zgrupowań wazonkowców, wpływa natomiast ograniczająco na ich zagęszczenia.
10
Content available remote New data on benthic Naididae (Annelida, Clitellata) in Polish brackish waters
60%
EN
This paper presents new findings on oligochaete species inhabiting Polish brackish waters. Identification of 455 specimens collected in September 2013 and July 2014 during the macrozoobenthos survey in the Port of Gdynia (the Gulf of Gdańsk, the southern Baltic Sea, Poland) showed the presence of six species belonging to two subfamilies Naidinae and Tubificinae.
EN
Zooseston of the Vistula River section almost 340 km long was investigated in the years 1997/98. In 99 samples collected 90 species of rotifers, 16 cladocerans, 9 copepods and other animals belonging to: Harpacticoidea, Oligochaeta, Nematoda, Chironomidae, Odonata, Simulidae, Tardigrada and Coelenterata were found. Multiple regression analysis showed that the number of rotifers is significantly correlated with basic chemical indicators of water trophic state - phosphate, nitrate and nitrite as well as with the number of copepods which are usually predators. The numbers of copepods depends on the availability of possible prey, i.e. rotifers and cladocerans. Multiple regression confirmed known dependence of cladocerans from trophic conditions. Clustering of similarity matrices showed complex structure of sestonic assemblages on rhitral-potamal gradient additionally modified by hydrotechnical constructions. These constructions broke old river continuum. Ordination of sites gave complex pattern not only representing a simple gradient rithral - potamal but also all transient stages caused by hydrotechnical construction (large dam reservoir) or by inflows of polluted waters from the tributaries. Ecological meaning of principal component ordination (PC) for river zooseston assemblages is not simple and might be susceptible of various interpretations.
EN
In two fishponds (area of 1.6 ha and 0.2 ha, depth to 1.5 m) in Silesian Upland (Southern Poland) rare in Europe species Aulodrilus japonicus Yamaguchi, 1953 was found to the first time in Polish fauna. The water bodies are slightly acid, soft (total hardness up to 96 mg CaCO₃ l⁻¹) and nutrient rich. A. japonicus occurred during the whole study period (from March to November) in both ponds. The greatest abundance (up to 120 ind.m⁻²) was observed in the summer, however the mature specimens were never found.
first rewind previous Strona / 5 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.