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| Registros recuperados: 174 | |
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| Bergmans, M.. |
| The life-cycle of the harpacticoid copepod <i>Tisbe furcata</i> (Baird, 1837) at 18°C was studied quantitatively. Stage durations were determined by two different methods, using synchronous cohorts. Combined nauplius stages last for 80.4h; the successive copepodite stages take 23.0, 23.2, 28.0 (females) to 23.2 (males), 33.4 (females) to 24.2 (males) and 48.8 (females) to 34.7 (males) h, respectively. Females develop more slowly but more synchronously than males. Age-specific survival and fertility rates were used to calculate the stable stage distribution in an exponentially growing population. From life-table data the following demographic parameters were computed: intrinsic rate of natural increase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Life cycle Tisbe furcata (Baird; 1837) ANE; Belgium; Oostende; Sluice Dock. |
| Ano: 1981 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3705 |
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| Pigeon, Mathieu; Frahan, Bruno Henry de; Denuit, Michel. |
| Recently, the European Commission proposed to introduce several risk management tools in the rural development pillar 2 of the CAP. One of them consists in providing co-financing support to mutual funds compensating farmers who experience a severe drop in their farm income. This paper analyses this new farm income stabilization tool for the Walloon region in Belgium, considering separately three groups of farms (crop, dairy and cattle farms). Relying on FADN data from 1997 to 2007, this analysis focuses on estimating the probability that such regional mutual funds would need to intervene to compensate farm net incomes and, in that case, the expected amount of each farm income compensation and the total expected amount of compensation. The budgetary... |
| Tipo: Presentation |
Palavras-chave: Agricultural risk management; Income stabilisation; Belgium; European Union; Risk and Uncertainty; D81; Q12; Q18.. |
| Ano: 2012 |
URL: http://purl.umn.edu/122485 |
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| Vranken, G.; Thielemans, L.K.; Heip, C.H.R.; Vandycke, M.. |
| <i>Monhystera parelegantula</i> (De Coninck,1943) was collected from the sediment of the Sluice-dock, a euhaline-polyhaline lagoon near the harbour of Ostend (Belgium). The species was cultivated in large numbers on a bacto-agar medium with bacterial growth. Embryonic growth was studied at 30 °C and 30 promille S. Maximum embryonic length-growth occurs at the vermiform stage. Post-embryonic length-growth, studied at 25 °C and 30 promille S, is a linear function of time and may be expressed as l = 160.46 + 29.55(t-t<sub>o</sub>), where t<sub>o</sub> = time at the beginning of development; t and l = time (d) and length (µm). At 25 °C and 30 promille S, average embryonic development time and generation time are 4 and 9 d... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Life cycle Monhystrella parelegantula ANE; Belgium; Oostende Harbour; Sluice Dock. |
| Ano: 1981 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3410 |
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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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| 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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| Luo, W.; Monbaliu, J.; Berlamont, J.. |
| The effect of bottom friction dissipation and of the different formulations used for this term on the wave evolution has been investigated in the Belgian coastal regions. Two eddy viscosity models for the bottom friction dissipation, the Madsen et al. (1988) model and Weber's (1991 a) model have been implemented in the Cycle 4 version of the third generation WAM model (Gunther et al., 1992). The wave conditions for the area of the southern North Sea were hindcasted for the February 1993 storm. The results are compared with buoy data. It is found that the net effect of bottom friction dissipation on the significant wave height hindcast is quite big, in the order of 80% (of the wave height when the bottom friction dissipation is taken into account) along the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coastal waters Wave dissipation ANE; Belgium. |
| Ano: 1997 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2937 |
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| Nieukerken, E.J. van; Doorenweerd, C.; Ellis, W.N.; Huisman, K.J.; Koster, J.C.; Mey, W.; Muus, T.S.T.; Schreurs, A.. |
| Bucculatrix ainsliella Murtfeldt, 1905 is for the first time reported from Europe: the Netherlands, Belgium, and adjacent Germany. DNA barcodes confirm its identity. It is the first North American lepidopteranspecies feeding on northern red oak Quercus rubra ever found in Europe, and only the second North American oak-feeding insect found in Europe. The species has regularly been found in the Netherlands and northern Belgium since 2006, and in 2011 also in Nordrhein-Westfalen in Germany, adjacent to the Dutch border, but the earliest records are from the Netherlands, Amersfoort in 1989 and 1990. Early stages, leafmines, and the adult are described, illustrated, and diagnosed against oak-feeding Bucculatrix ulmella Zeller, 1848 and other similar species.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bucculatrix ainsliella; Invasive species; Northern red oaks; Quercus rubra; Bucculatricidae; The Netherlands; Belgium; Germany; 42.75; 42.56. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/433335 |
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| Redant, F.. |
| The report provides information on the importance of Caridean shrimps in the food of juvenile <i>Trigla species</i> (gurnard), <i>Agonus cataphractus</i> (hook-nose) and <i>Liparis liparis</i> (sea snail) in the Belgian coastal waters, and gives some biometric data related to stomach content and composition. The results show the importance of Caridean shrimps, especially <i>Crangon crangon</i>, as a food source for perciform fish species in inshore waters. The records of the chameleon prawn, <i>Hippolyte varians</i> in fish stomachs and in trawl and grab samples are compared, and the actual knowledge on the distribution and abundance of this shrimp species is discussed. |
| Tipo: Info:eu-repo/semantics/book |
Palavras-chave: Food preferences Caridea [Shrimps] Perciformes ANE; Belgium; Belgian Coast. |
| Ano: 1982 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3387 |
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| Lock, K.; Beyst, B.; Mees, J.. |
| The intertidal fauna of a Belgian sandy beach was sampled on an hourly basis with a hand-pushed sledge to study circadiel patterns in species composition. Four assemblages could be distinguished with classification and ordination techniques. A first division separated the samples taken during daytime from the night samples. Both assemblages were subsequently divided into an ebbtide and a floodtide situation. Light intensity and tidal height were the most important variables explaining the variation in the Canonical Correspondence Analysis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ANE; Belgium; Brugge; Zeebrugge. |
| Ano: 1999 |
URL: http://www.vliz.be/imisdocs/publications/233876.pdf |
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| Registros recuperados: 174 | |
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