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| Registros recuperados: 16 | |
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| Donselaar, J. van. |
| In this article, the second of a series of four, a number of swamp communities occurring along former river beds in the forelands of the great rivers in the Netherlands are dealt with according to the new classification of reed swamp and marsh communities (order Phragmitetalia, class Phragmitetea) in WESTHOFF & DEN HELD (1969). For more background information the reader is referred to VAN DONSELAAR (1961, 1971). The association Typhetum angustifoliae (alliance Phragmition) can be recognized in the river forelands. There its composition is identical with that in stagnant fresh waters. However, a comparison with the communities of the backswamps in the fresh water tidal area (ZONNEVELD, 1960) makes it questionable whether the new classification can be... |
| Tipo: Article / Letter to the editor |
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| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/526506 |
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| Donselaar, J. van. |
| Geology and soils in general Surinam is situated at the northern edge of the very old and stable Guiana shield. Six-sevenths of the country’s surface are occupied by formations belonging to the shield and designated together as the basal complex. However, the Roraima formation does not belong to the complex. It was deposited during the Mesozoic (probably the Cretaceous) as a thick layer mainly consisting of sandstone that covered the greater part of the shield. Later on the original sandstone plateau was dissected, a process accelerated by the uplifting of the shield, and finally it disappeared almost completely by erosion. The former surface is now only represented by the flat tops of some table-mountains one of which is found in the interior of Surinam:... |
| Tipo: Article / Letter to the editor |
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| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/534880 |
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| Kramer, K.U.; Donselaar, J. van. |
| In February and early March, 1961, the senior author spent three weeks on a small savanna in the approximate centre of Suriname, South of Tafelberg, (map 1). He was accompanied by Mr. W. H. A. Hekking. The time was spent in exploring the flora of the savanna and the adjacent forest. As a detailed study of the vegetation of the savannas of northern Suriname was then in progress, several extensive papers being in preparation (Heyligers, 1963; Van Donselaar, 1965; Van Donselaar-Ten Bokkel Huinink, 1966), it was felt that a more thorough inventory of the vegetation and the flora of the savanna might be rewarding. When a general impression of the plant-cover of the area had been obtained, eight representative sample-plots were selected, their vegetation was... |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/534789 |
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| Donselaar, J. van. |
| Lianes, defined as woody climbers and (facultatively) straggling shrubs, were collected in an area of about 1900 square kilometres of the Brokopondo District, in the interior of Surinam. Ten different habitats were distinguished only one of which was intensively sampled, viz. the so-called “high forest”, the most luxuriant climax vegetation type in the area. A total of 132 species were distinguished, 80 of which could be determined with certainty and 15 nearly so. Among the identified species one was new (described since as Dicranostyles guianensis A. Mennega, Conv.), and 5 were new records for Surinam, viz. Sparattanthelium aruakorum Tutin (Hern.), Abuta obovata Diels, Abula splendida Kruk. et Mold., and Sciadotenia sagotiana (Eichl.) Diels (all Menisp.),... |
| Tipo: Article / Letter to the editor |
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| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/535013 |
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| Donselaar, J. van. |
| This study deals with the vegetation of about 125 former beds of the larger rivers in the Netherlands. It includes all communities of higher plants except the carrs, which are dealt with in a separate paper by Kop (1961). The investigation of the communities aimed at a knowledge of their floristic composition as well as at a definition of their habitat. The description and the classification of the units was carried out according to the concepts and methods of the Braun-Blanquet school (Braun-Blanquet, 1932, 1951; Becking, 1957). Moreover, among the former river beds types were recognized, characterized by a special set of communities and by correlated abiotical properties. A number of vegetation-units are described here for the first time, viz. The... |
| Tipo: Article / Letter to the editor |
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| Ano: 1961 |
URL: http://www.repository.naturalis.nl/record/535101 |
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| Donselaar, J. van. |
| The flora of the southern Surinam savannas (not completely known but probably so for the greater part) consists of 314 species collected so far. Ten of these were not found in any other region, 6 belong to the southern Guianan element, 14 to the Guianan element, the rest have a wider distribution. Fourty of the species occur in this region on the northern limit of their area and 18 of these even reach their northernmost station here. Among the 290 species collected on savannas in central Amazonia 82 species were found also on the savannas of southern Surinam. Northern Surinam, with a total of 288 recorded savanna species, has 183 species in common with southern Surinam. This floristic contrast can be correlated for about half of the differentiating species... |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/535074 |
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| Boterenbrood, A.J.; Donsellaar-Ten Bokkel Huinink, W.A.E. van; Donselaar, J. van. |
| Dans la végétation des dunes du Languedoc J. BRAUN-BLANQUET (1952) distingue trois associations, à savoir; 1) l’Agropyretum mediterraneum parmi et sur les premières dunes basses; 2) l’Ammophiletum arundinaceae sur les dunes plus hautes; et 3) le Crucianelletum maritimae dans les dépressions et en arrière des dunes. Or, il est établi que le développement de la première association et le passage de celle-ci à la deuxième sont accompagnés d’une édification de dunes, et que la troisième provient de la dégénérescence de la deuxième. KÜHNHOLTZ-LORDAT (1923) a le premier attiré l’attention sur le rôle essentiel joué par la végétation dans l’édification des dunes du Languedoc. Les résultats de ses recherches ont été confirmés par VAN DIEREN (1934) aux Pays-Bas.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1956 |
URL: http://www.repository.naturalis.nl/record/535099 |
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| Donselaar, J. van. |
| The Brokopondo Lake in the interior of Surinam began to form when on 1 February 1964 the dam in the Surinam River near Afobaka was closed. The lake was intended to cover an area of about 150.000 ha and to have a maximal depth of about 47 m. The basin, largely occupied by forest, was not cleared beforehand. During the initial stage the water in the flooded forest was characterised by a very high content of organic matter and the absence of oxygen. As the water level rose, differentiation between a hypolimnion and an epilimnion developed. The oxygen content of the epilimnion was high. During the first three years of its existence the lake attained an area of about 84.000 ha and a maximal depth of 38 m. Within this period eight aquatic plant species became... |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/535030 |
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| Donselaar, J. van. |
| The present article is the first of a series in which a new classification of the reed swamp and marsh communities (order Phragmitetalia, class Phragmitetea) in the Netherlands (in WESTHOFF & DEN HELD, 1969) will be tested. The material used consists of the sample-plot analyses recorded by the Foundation for Biocenological Research (SOL) in the years 1954-1956 along former river beds in the forelands of the great rivers. Therefore, the test implies a partial re-evaluation of the results of that study as presented by VAN DONSELAAR (1961). The first community treated, the association Scirpetum lacustris (alliance Phragmition), most of which was formerly included in the Scirpo-Phragmitetum, appears to be easily recognizable. In the river forelands it has... |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/526977 |
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| Donselaar, J. van; Jonker, F.P.. |
| Up till now the lower deposits of peat (in Dutch: veen-op-groterediepte = peat at greater depth) have been investigated in the Netherlands mainly in the Western part of the country, viz. in the provinces of Noord-Holland, Zuid-Holland and Zeeland. The analyses have shown that the development of this, now comparatively well known peat layer must have begun either in the second half of the boreal period or else in the beginning of the atlantic one, and that it must have come to an end in the first half of the latter. Among the earlier investigators the botanist Mrs VERNEER-LOUMAN and some geologists had arrived at the conclusion that the sudden transgression of the North sea which made an end to the formation of peat, took place in the boreal period, and hat... |
| Tipo: Article / Letter to the editor |
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| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/535091 |
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| Donselaar, J. van. |
| In his preliminary revision of the genus Ceratopteris Benedict (1909) distinguished four species: C. thalictraides (L.) Brongn., C. pteridoides (Hook.) Hieron., C. deltoidea Benedict, and C. lockhartii (Hook. & Grev.) Kunze. Two more names were said to deserve further investigation: C. cornuta (Palisot) LePrieur and C. gaudichaudii Brongn. Since then the first four have not been in dispute, C. cornuta has become generally recognized, and C. gaudichaudii has remained doubtful (Fosberg, 1958). Most of the species of Ceratopteris are widely distributed. Ceratopteris thalictroides occurs in tropical Asia, Australia, and America (Benedict, 1909; Morton, 1967). Ceratopteris pteridoides is known from tropical America, subtropical South America, and... |
| Tipo: Article / Letter to the editor |
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| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/535022 |
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| Donselaar, J. van. |
| The vegetation was studied of a number of savannas in northern and southern Surinam, and in French Guiana. The results are compared in particular with the vegetation classification proposed earlier for northern Surinam, and with some records from the northern Rupununi Savanna, Guyana (Van Donselaar 1965). The savannas studied near Brownsweg (northern Surinam) have vegetation types that correspond completely with those of some other savannas of the same geological-pedological type more to the North, as described before. New is the finding of a type of scrub bordering the savanna, being the scrub equivalent of a type of bushes described earlier as the Marlierea type. On the top and the slopes of the Blauwe Berg near Berg en Dal (northern Surinam) an... |
| Tipo: Article / Letter to the editor |
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| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/535179 |
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| Donselaar, J. van; Kop, L.G.; Voo, E.E. van der; Westhoff, V.. |
| In the years 1954-1957 The Foundation for Biocenological Research (Stichting tot Onderzoek van Levensgemeenschappen, S.O.L.) carried out an extensive study on the vegetation of about 125 former river beds in the Netherlands. They were situated along the great rivers and their branches, viz. Meuse, Oude Maas (“Old Meuse”), Heusdense Maas (“Heusden Meuse”), Rhine, Lek, Merwede, Waal and IJsel. The work was made possible by a grant of the Netherlands Organisation for Pure Research (Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek, Z.W.O.). Dr. M. F. Mözer Bruijns proposed and supervised the investigation, and Dr. V. Westhoff took part in the interpretation of the results. The field work was carried out by A. J. Quené-Boterenbrood (1954-55), W.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1961 |
URL: http://www.repository.naturalis.nl/record/534813 |
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| Registros recuperados: 16 | |
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