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| Beets, C.. |
| INTRODUCTION In the summer of 1950, the present writer spent a three weeks' holiday dredging in the Great Bitter Lake. Plans to collect specimens in that area for the Rijksmuseum van Natuurlijke Historie at Leiden had, unfortunately, to be drawn up somewhat hurriedly, but at least the most essential equipment was complete by the beginning of the writer's stay at Fayed, on the western shore of the Lake. Between August 18th and September 5th, the Great Bitter Lake was explored as well as possible under the circumstances. The investigation discussed below was, as is fully realised, of a limited character; it consisted almost exclusively of operations for collecting marine organisms, though on a fairly large scale. However, it was considered preferable to do... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.92. |
| Ano: 1953 |
URL: http://www.repository.naturalis.nl/record/318344 |
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| Nieukerken, E.J. van; Velde, G. van der. |
| A hydrobiological description of eight ditches in the Dutch inland polders "Oude Land van Strijen" and "St.-Anthoniepolder" (province of South-Holland) is given. The flora and macrofauna (table 2 and 3) have been studied in July and October 1971. A few chemical data (chloride-content and conductivity) of the water are presented. In the northern part of the area the percolating water is fresh due to the influence of the "Binnenbedijkte Maas", one of the few real freshwater lakes of the Deltaic region. In the southern part it is brackish due to the influence of the „Hollands Diep". The bottomprofile of the polders shows heavy river-clay poor in chalk (upper 40-100 cm) on peat. The examined ditches are hardly polluted and the water is clear. On the bottom of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Inventarisatie; Oude Land van Strijen; St. Anthoniepolder; Sloten; Flora en fauna; 42.92. |
| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/303571 |
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| Nieukerken, E.J. van; Tol, J. van. |
| „De plantenminnaar zal echter te vergeefs in de Haagsche duinen zoeken naar de voor de duinflora zoo typische bloemen, wier groei is gebonden aan den eisch, dat de bodem het gansche jaar door moerassig moet blijven, zoodat zij daar na de oprichting der Duinwaterleiding zijn verdwenen. Doch hoe hoog men ook het nut van het botaniseeren moge aanslaan, daaraan mag toch niet het veel hooger belang worden opgeofferd, dat voor een stad als 's Gravenhage verbonden is aan het verkrijgen van uitstekend en goed drinkwater, hare onvermijdelijke en voornaamste levensbehoefte." Pareau (z.j. : 49-50) INHOUD Ι. Inleiding .................. 39 2. Algemene beschrijving van het gebied........... 40 3. Geschiedenis van het voorkomen van water in Meijendel...... 40 3.1 Tot de... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.92. |
| Ano: 1978 |
URL: http://www.repository.naturalis.nl/record/317245 |
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