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| Dieleman, Jan; Pinkster, Sjouk. |
| In the autumn of 1975 and in the spring of a new survey of the range of Gammarus tigrinus Sexton, 1939, was carried out, especially at the borders of the 1973 range. Considerable range extensions were found in the north-eastern parts of the province of Groningen, the Kampereiland (province of Overijssel), in the Deltaic Region and in some more or less isolated areas in the province of Zuid-Holland. In most of the newly invaded areas G. tigrinus has replaced the indigenous Gammarus species. Sampling along the Dutch-German border revealed that no invasion has taken place from any of the German populations. A fungus was found which appeared to be pathogenic for G. tigrinus. |
| Tipo: Article / Letter to the editor |
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| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/505482 |
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| Pinkster, Sjouk; Dieleman, Jan; Platvoet, Dirk. |
| Since its first discovery in the Netherlands in 1964, Gammarus tigrinus has rapidly spread over inland waters in the western and north-eastern parts of the Netherlands. It appeared that at the end of 1976, G. tigrinus had replaced the local Gammarus species in most of the newly invaded waters. Surveys carried out in 1978 and 1979 showed a different and rather confusing pattern i.e that G. tigrinus is still extending its range in the delta region of the Netherlands and in the province of Zuid-Holland but that its spreading has come to a stand still in the rest of the country. It has even disappeared from a great number of formerly inhabited waters. In some of these waters indigenous species like G. d. duebeni and G. p. pulex reappeared after an absence of... |
| Tipo: Article / Letter to the editor |
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| Ano: 1980 |
URL: http://www.repository.naturalis.nl/record/505333 |
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