|
|
|
|
|
| Dörjes, J.; Young, J.O.. |
| The only hitherto known freshwater acoelan, Oligochoerus limnophilus, has been fully described by Ax & Dörjes (1966). It has been recorded from habitats of different European rivers: Elbe, Ilmenau, Lahn, Main, Mosel and Donau (Kothé, 1961, 1962; Kothé & Sturz, 1963; An der Lan, 1964) where it prefers to settle on artificial stone embankments and is absent from typical lenitic regions and in river parts with a high organic pollution. The species has also been recorded from irrigation canals of rice fields in the Camargue (leg. U. Graefe). Ax & Dörjes (1966) suppose that O. limnophilus emigrated during postglacial periods out of the ponto-caspian area into their new environments because all the other species of the genus have been found in the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76. |
| Ano: 1975 |
URL: http://www.repository.naturalis.nl/record/317230 |
| |
|
|
| Young, J.O.. |
| INTRODUCTION During the week 7th to 12th June, 1971 opportunity was taken of accompanying members of the I.B.P. team based at the Tjeukemeer, the Netherlands, on a boat journey through the Friesland lakes. The main aim of the author was to collect Turbellaria (Tricladida and Microturbellaria) from the vegetation and stones in the littoral zone of 16 lakes (see Table 1). However, any specimens of Gasteropoda and Hirudinea obtained in samples were also noted. METHODS In the reed beds, mostly Phragmites (see Table 1), an F.B.A. net (60 meshes/inch = approx. 23.6 meshes/cm) mounted in a square frame on a 5 ft. (1.524 metres) pole was used to sweep through the vegetation and top layers of substratum for a given period of time (minimum 15 minutes). The contents... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.76; 42.73. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/317240 |
| |
|
|
|
