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| Slikke, Wout J. van der; Duistermaat, Leni (H.); Groen, Kees (C.) L.G.. |
| Between 1989 and 1993 the FLORON Foundation has run a special project to gather data on the distribution of 105 selected plant species in the Netherlands. More than 11.500 square kilometers were visited and a total amount of 150 thousand records has been accumulated by over 1200 botanical naturalists (here called florists). The distribution data have been added to the national floradatabase FLORBASE. The main result of the project is a large increase of our knowledge on the distribution patterns of the species involved, on a detailed scale of 1 x 1 km. The contribution to FLORBASE of known sites of these species due to this project varies between 15% and 69%. The increase is highest for early-flowering species and species that grow mainly at urban sites.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/526536 |
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| Groen, Kees (C.) L.G.; Tamis, Wil L.M.. |
| In 1995 heeft FLORON in opdracht van het RIZA, een onderzoeksinstituut van Rijkswaterstaat, een floristisch meetnet ontworpen voor de oevers van de grote zoete wateren: Rijn, Maas, IJsselmeer, Randmeren en de Zoete Deltawateren. De afgelopen jaren is de behoefte aan biotische meetnetgegevens bijoverheden en terreinbeheerders sterk toegenomen. Ze geven de mogelijkheid vrij snel veranderingen te signaleren als gevolg van gevoerd beleid of beheer. Intensief en systematisch kijken op een beperkt aantal lokaties leveren belangrijke aanvullingen op de verspreidingsgegevens van planten en dieren, die in het kader van atlasprojecten worden verzameld. Het floristisch meetnet wordt onderdeel van een programma met verschillende, op elkaar afgestemde meetnetten rond... |
| Tipo: Article / Letter to the editor |
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| Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/528022 |
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| Meijden, Ruud van der; Odé, Baudewijn; Groen, Kees (C.) L.G.; Witte, Flip (J.-P.) M.; Bal, Dick. |
| In this publication five classes are treated: Lycopsida, Equisetopsida, Pteropsida, Pinopsida and Magnoliopsida. The present proposal replaces the “FLORON-Rode Lijst 1990” (Gorteria 16, 1990, 2-26). It meets the requirements of the IUCN criteria. Species are classified according to a combination of rareness and decrease into eight categories: ‘Not Evaluated’ (NB), ‘Data Deficient’ (OG), ‘Actually Not Threatened’ (TNB; IUCN: ‘Low Risk/Least Concern’), ‘Near Threatened’ (GE), ‘Vulnerable’ (KW), ‘Endangered’ (BE), ‘Critically Endangered’ (EB), and ‘Disappeared’ (VN; IUCN: ‘Regionally Exctinct’), the latter five forming together the Red List (RL2000). For this purpose 1490 species have been considered. The new List (Rode Lijst 2000) counts 499 species (38% of... |
| Tipo: Article / Letter to the editor |
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| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/527977 |
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| Zonderwijk, Maarten; Groen, Kees (C.) L.G.. |
| From 1970 onwards, Cochlearia danica has spread considerably along motorways in the Netherlands. Similar observations have been made in surrounding countries. The increase of the species is presumably caused by a change in road management, leading to an increase of de-icing salts during winter. The settlement of Cochlearia danica along a section of a motorway has been studied. It appears that the first settlements usually occur near intersections and viaducts; in the following years the species spreads massively along the road sections in between, nearly exclusively on the central reservation. The abundance of the species is highest in the centre strips; the soil permeability is relatively small here, so that the salt is not leached out by rainwater. |
| Tipo: Article / Letter to the editor |
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| Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/526843 |
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