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| Registros recuperados: 17 | |
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| Polk, P.. |
| The sluice-dock at Ostend is an artificial lagoon (1.5 m deep and with an area of 86 ha) connected to the harbour of Ostend and the North Sea by sluices (vannes). At low tides, during spring tide, the whole dock can be emptied, washing out the planktonic biomass. As an oyster culture exists in this biotope, applied and fundamental research is done. Planktonic larvae of oyster predators can be eliminated from the biotope by washing out the whole water volume during their bloom and replacing it by new sea-water. The oyster pest <i>Crepidula fornicata</i> (introduced with oyster spatfall from the Netherlands and reproducing heavily in the sluice-dock, otherwise not occurring along the Belgian coast) is controlled in this way (before: 15,746... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ANE; Belgium; Oostende Harbour; Sluice Dock. |
| Ano: 1978 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3587 |
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| Polk, P.. |
| The Tunicate <i>Botryllus schlosseri</i> (Pallas) was observed for the first time in the sluice-dock (Bassin de Chasse) of Ostend during the year 1960. This species was probably imported into Belgium together with spat from Zealand (Holland). During the year the species has spread and multiplied extensively. This species can therefore be considered as belonging to the Belgian marine fauna. The sexual reproduction and settling of new colonies took place during the months of August, September, October and November. During those months a settling of 98% was observed on the test surfaces in the immediate vicinity of the infected oysters. About 1 km from this locality in the Bassin de Chasse, where no infected oysters were found, a settling of only... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oyster culture Parasites Botryllus schlosseri (Pallas; 1766) ANE; Belgium. |
| Ano: 1962 |
URL: http://www.vliz.be/imisdocs/publications/241948.pdf |
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| Hauspie, R.; Polk, P.. |
| In the field ecology of populations, two concepts are largely distributed and generally accepted:- the competitive exclusion principle states that organisms occupying similar ecological niches, come into competition and consequently cannot coexist. - the more two organisms are close to each other in phylogeny, the more they will tend to occupy similar niches. The results obtained from the study of populations of harpacticoids colonizing artificial substrata are somehow an illustration of these principles. Indeed, these species which coexist belong most of the time to different genera or even to different families. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1974 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3501 |
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| Polk, P.. |
| 1. For the first time, <i>Crepidula fornicata</i> was observed in Belgium on 28-9-1911; in 1959, it became an oyster pest. 2. It was first introduced into Belgium with seed oysters from Great Britain. Later on, with seed oysters from the Netherlands. 3. Probably, the geographical spreading is caused by the adult animals attached to oysters. Larval propagation is responsible for local extension. 4. In the sluice-dock at Ostend, larvae occur from the middle of May till the end of November; they swim freely for a period of about 12 days. The first massive emission of larvae is observed during May and June, a second one in September. 5. The larvae settle preferentially at a depth of 65 cm. 6. Maximum settling takes place in May. It then decreases... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Introduced species Crepidula fornicata (Linnaeus; 1758) ANE; Belgium; Oostende Harbour; Sluice Dock. |
| Ano: 1962 |
URL: http://www.vliz.be/imisdocs/publications/256254.pdf |
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| Registros recuperados: 17 | |
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