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Registros recuperados: 174
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A demographic study of the life cycle of <i>Tisbe furcata</i> (Baird, 1837) (Copepoda: Harpacticoida) OMA
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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Actuarial evaluation of the EU proposed farm income stabilisation tool AgEcon
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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Annotated catalogue of Porifera type specimens in the Belgian national collections OMA
Willenz, P..
The national zoological collections of Belgium house 161 type specimens representing a total of 64 nominal species of Porifera. A list of extant and lost specimens is provided, presenting their original name, synonyms, museum characteristics and bibliography.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Museum collections; Type specimens; Porifera [Sponges]; Belgium.
Ano: 1994 URL: http://www.vliz.be/imisdocs/publications/253432.pdf
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Annotated checklist of the gall midges from the Netherlands, Belgium and Luxembourg (Diptera: Cecidomyiidae) Naturalis
Roskam, J.C.; Carbonnelle, S..
The gall midges are one of the most important groups of gall makers. Emerging larvae produce stimuli and the host plant responds by producing galls, fascinating structures which provide food and shelter for the developing larvae. Most gall inducing midges are host specific: they are only able to induce galls in a few, often related, plant species. A few species have different feeding modes: among them are saprophagous, fungivorous and predaceous species and some are used in biocontrol. We recorded 416 species in the whole area; 366 species are recorded from the Netherlands, 270 species from Belgium and 96 species from Luxembourg.
Tipo: Article / Letter to the editor Palavras-chave: Diptera; Cecidomyiidae; Netherlands; Belgium; Luxembourg; Distribution; Biology; 42.75.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/640395
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Aspects of the life-cycle of <i>Monhystera parelegantula</i> (Nematoda; Monhysteridae) OMA
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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Avifauna van de Spuikom OMA
Hautekiet, M.R..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic birds ANE; Belgium; Oostende Harbour; Sluice Dock.
Ano: 1962 URL: http://www.vliz.be/imisdocs/publications/277119.pdf
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Benthos of a sublittoral sandbank in the Southern Bight of the North Sea: general considerations OMA
Willems, K.A.; Vanosmael, C.; Claeys, D.; Vincx, M.; Heip, C.H.R..
The benthic fauna of the Kwinte Bank, a linear sandbank in the Belgian coastal waters of the North Sea, was sampled on ten stations in September 1978. This sandbank shows a linear gradient from fine sandy sediments in the south to coarser sandy sediments in the north as a result of the tidal current pattern in the region. The influence of this gradient on macro- and meiofauna was studied. Diversity of polychaetes and harpacticoid copepods is correlated with median grain size of the sand fraction, diversity of nematodes is not. The influence of station location and sediment characteristics on density of all major macrobenthic groups is very outspoken, and linear density trends are common. This is not true for meiofauna in general and nematodes and copepods...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos Sand banks ANE; Belgium; Flemish Banks; Kwinte Bank ANE; North Sea; Southern Bight.
Ano: 1982 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3393
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Bijdrage tot de kennis der mariene fauna van de Belgische kust: 2. Waarnemingen aangaande het voorkomen en de voortplanting van <i>Botryllus schlosseri</i> (Pallas, 1766) OMA
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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Bijdrage tot de kennis der mariene fauna van de Belgische kust: 4. De bestrijding van de oesterplaag <i>Crepidula fornicata</i> L. in de Spuikom te Oostende OMA
Polk, P..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Introduced species Oyster culture Pest control Crepidula fornicata (Linnaeus; 1758) ANE; Belgium; Oostende Harbour; Sluice Dock.
Ano: 1962 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7927
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Bijdrage tot de kennis der mariene fauna van de Belgische kust (III). Waarnemingen aangaande het voorkomen, de voortplanting, de settling en de groei van <i>Crepidula fornicata</i> (L.) OMA
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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Bijdrage tot de kennis der mariene fauna van de Belgische kust: V. Some observations on the Crustacean fauna of the Sluice-dock (Bassin de Chasse) of Ostend OMA
Polk, P..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crustacea [crustaceans] ANE; Belgium; Oostende Harbour; Sluice Dock.
Ano: 1963 URL: http://www.vliz.be/imisdocs/publications/290069.pdf
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Bottom friction dissipation in the Belgian coastal regions OMA
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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Bucculatrix ainsliella Murtfeldt, a new North American invader already widespread on northern red oaks (Quercus rubra) in Western Europe (Bucculatricidae) Naturalis
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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Caractéristiques physiques et chimiques fines des cendres volcaniques : application à la téphrostratigraphie ArchiMer
Jouannic, Gwénolé.
The challenge of this work was to carry out several tephrostratigraphic studies in various sedimentary environments in order to test the efficiency of classical detection methods of tephra layers. First, analysis has been focused on tephra keys, previously studied in known sites, in Belgium and in the Jura Mountains, in order to update data with current analytical techniques. This work was later expanded to sites from eastern French Massif Central, an area with unexploited tephrostratigraphic potential, which offers the possibility to precise the source of cryptotephras identified in the Jura and Switzerland whose origin was uncertain. This work has been carried out in tephras sampled in loess, carbonate maris and peat allowing to discuss conservation...
Tipo: Text Palavras-chave: Téphra; Jura; Massif Central; Belgique; Diatomées; Imagerie scanner; XRF; Susceptibilité magnétique; Pyroclastites -- Jura (massif); Pyroclastites; Pyroclastites -- Liège (Belgique; Région); Stratigraphie; Téphrochronologie; Tephra; French Massif Central; Belgium; Diatoms; CT Scan; Magnetic susceptibility.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00506/61720/65688.pdf
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Caridean shrimps in the food of demersal fish off the Belgian coast: 1. Gadiformes OMA
Redant, F..
The report provides information on the importance of Caridean shrimps in the food of juvenile <i>Merlangius merlangus</i> (whiting), <i>Trisopterus luscus</i> (bib), juvenile <i>Gadus morhua</i> (cod) and <i>Ciliata mustela</i> (five-bearded rockling) in the Belgian coastal waters, as well as some biometric data related to stomach content and composition (stomach weight, weight of Caridean shrimps per stomach, number of Caridean shrimps per stomach in relation to predator size). The results clearly demonstrate the importance of Caridean shrimps, especially <i>Crangon crangon</i>, as a food source for Gadoid fish species in inshore waters.
Tipo: Info:eu-repo/semantics/book Palavras-chave: Demersal fisheries Food preferences Caridea [Shrimps] Gadiformes ANE; Belgium; Belgian Coast.
Ano: 1982 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3386
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Caridean shrimps in the food of demersal fish off the Belgian coast: 2. Perciformes OMA
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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Caridean shrimps in the food of demersal fish off the Belgian coast. 3. Pleuronectiformes OMA
Nierynck, E.; Redant, F..
Tipo: Info:eu-repo/semantics/book Palavras-chave: Demersal fisheries Food preferences Caridea [Shrimps] Pleuronectiformes ANE; Belgium; Belgian Coast.
Ano: 1983 URL: http://www.vliz.be/imisdocs/publications/128960.pdf
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Catalogue des types de poissons récents de l'Institut royal des Sciences naturelles de Belgique OMA
Walschaerts, L..
Tipo: Info:eu-repo/semantics/book Palavras-chave: Holotypes; Museum collections; Pisces [Fish]; Belgium.
Ano: 1987 URL: http://www.vliz.be/imisdocs/publications/131165.pdf
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Causes and incidence of the "black spot disease" on brown shrimp (<i>Crangon crangon</i>) OMA
Vervoort, D.; Redant, F.; Declerck, D..
Tipo: Info:eu-repo/semantics/book Palavras-chave: Diseases Crangon crangon (Linnaeus; 1758) [Brown shrimp] ANE; Belgium; Belgian Coast.
Ano: 1980 URL: http://www.vliz.be/imisdocs/publications/128842.pdf
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Circadiel patterns in the tidal plankton of a sandy beach in Zeebrugge (Belgium) OMA
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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