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| Drok, Willem-Jan A.; Weeda, Eddy J.. |
| In 1998 Marsilea quadrifolia was observed for the first time in the Netherlands, on the bank of a sheet of water in a foreland of the river Waal, 190 km north of its nearest (former) localities, in a pioneer vegetation belonging to the association Eleocharito acicularis-Limoselletum, resembling its past occurrence in similar plant communities in Hungarian rice fields and in the Upper Rhine Valley. Two of the three specimens produced 20 sporocarps altogether. The new appearance of a European Red List species in the Dutch riverine area might be termed a striking and encouraging phenomenon which was made possible by a new kind of water and nature management. |
| Tipo: Article / Letter to the editor |
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| Ano: 1999 |
URL: http://www.repository.naturalis.nl/record/526822 |
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| Peters, Bart W.E.; Weeda, Eddy J.; Teunissen, Twan H.; Berg, Louis-Jan van den. |
| Until the mid-20th century, Corrigiola litoralis was recorded from river banks in several parts of the Dutch riverine area where it mainly occurred along the River Meuse and the River Waal. For a few decades, the species appeared to have become extinct in this habitat due to river canalisation and intensive agriculture, but in recent years it has been found again on river sides. In 1999, a single specimen was observed on a gravel bank along the River Meuse. In the Nijmegen region, the species seems to have reclaimed its former area along the River Waal. After the re-emergence of active sandy levees due to nature rehabilitation projects and several flood events, the species has become gradually more numerous there since 1996. Hitherto, Corrigiola litoralis... |
| Tipo: Article / Letter to the editor |
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| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/527622 |
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| Beek, Bram van de; Bijlsma, Rienk-Jan; Haveman, Rense; Meijer, Karst; Ronde, Iris de; Troelstra, Anne S.; Weeda, Eddy J.. |
| In Noordwest-Europa is de taxonomie van bramen (Rubus L. subgenus Rubus) goed op orde en de verspreiding van bramen in de verschillende landen goed bekend dankzij herbarium- en veldonderzoek vanaf de jaren 1970. De meeste soorten zijn gestabileerde apomicten die zonder bevruchting zaad vormen. De nakomelingen van een zich apomictisch voortplantende braam zijn hierdoor genetisch gelijk aan de moederplant. In Nederland dateert onderzoek aan bramen pas van na 1900 met een actieve periode na de Tweede Wereldoorlog. Dit resulteerde in 1956 in de Rubi Neerlandici door W. Beijerinck, een overzicht gebaseerd op de kunstmatig soortsopvatting van H. Sudre (Rubi Europae; 1908–1913). Het moderne, op typemateriaal en veldwerk gebaseerde onderzoek startte begin jaren... |
| Tipo: Article / Letter to the editor |
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| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/527753 |
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| Zwart, Awie J. de; Weeda, Eddy J.. |
| In the past Salvia verbenaca occurred as a native, albeit very rare plant in two parts of the Netherlands, viz. the southwestern province of Zeeland and the riverine area in the eastern province of Gelderland. Because it was not recorded anymore after 1948, it was considered extinct. Excluding the 1989 man-made locality in the north, it was rediscovered in 2000 on a dike along the Wester Scheldt, probably on the same spot where it was erroneously identified as Salvia pratensis in 1981. Also in the past such mistakes occurred for other localities in Zeeland. |
| Tipo: Article / Letter to the editor |
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| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/526527 |
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| Jager, Henk J.; Weeda, Eddy J.. |
| In the Netherlands Hordeum marinum approaches the northwestern fringe of its area. It has strongly declined and is now considered an endangered species. Sofar its ecology and sociology had only been investigated in the SW of the country. There it mainly occurs on salty sites inside the dikes and is often accompanied by Parapholis strigosa and Puccinellia distans subsp. distans. In the N of Friesland and the NW of Groningen along the Wadden Sea the authors recorded Hordeum marinum in a range of localities in salt-marshes in the Puccinellia maritima belt in lower parts of the grassy marsh and in somewhat larger numbers in the Festuca rubra belt higher on. However, its main occurrence is on the summer embankments which are only reached by the flood at storm... |
| Tipo: Article / Letter to the editor |
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| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/526844 |
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