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Registros recuperados: 107
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1971-1991: twenty years of marine ecology OMA
Heip, C.H.R..
Tipo: Info:eu-repo/semantics/article
Ano: 1991 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2862
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A comparison between models describing the influence of temperature on the development rate of copepods OMA
Heip, C.H.R..
Four mathematical expressions relating development time to temperature are compared. All four yield good predictions of the development rate of the copepod <i>Tachidius discipes</i>. The use of the equation of Belehradek is criticized. It is concluded that the power equation D= aT<sup>b</sup> gives the best approximation in this case.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Temperature effects; Copepoda [copepods].
Ano: 1974 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3496
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A further note on wing-spreading of black storks OMA
Heip, C.H.R..
Tipo: Info:eu-repo/semantics/article
Ano: 1976 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6979
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A new index measuring evenness OMA
Heip, C.H.R..
A new evenness index based on the Shannon-Wiener information <i>H</i> is defined as (<i>e<sup>H</sup></i> -1)/(<i>S</i> -1). This index is theoretically superior to other evenness indices and has a better statistical behaviour.
Tipo: Info:eu-repo/semantics/article
Ano: 1974 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3490
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A note on salinity and temperature in some Moroccan brackish waters OMA
Heip, C.H.R.; De Coninck, L.A.P.; Engels, P.; Engler, G.; Verschueren, G..
A series of measures of temperature and salinity was made in different brackish waters along the Atlantic coast of Morocco. All waters examined were polyhaline, except for a series of hyperhaline salt mines. The importance of temperature in the sediment is discussed: temperature in the top layer may rise considerably (7° C) above air temperature. However, in the deeper layers, temperature is lower than in the air and the water.
Tipo: Info:eu-repo/semantics/article
Ano: 1972 URL: http://www.vliz.be/imisdocs/publications/260556.pdf
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A note on the life-span of r-strategists OMA
Heip, C.H.R..
The idea is presented that the short life-span of <i>r</i>-strategists may in some cases be an adaptation to avoid predation. Evidence supporting this hypothesis is presented by examination of predation of the polyp <i>Protohydra leuckarti</i> on harpacticoid copepods.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Longevity.
Ano: 1974 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3494
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A rapid method of extracting meiobenthic nematodes and copepods from mud and detritus OMA
Heip, C.H.R.; Smol, N.; Hautekiet, W..
The extraction of nematodes and harpacticoid copepods from muddy sediments or sediments containing a large amount of organic detritus can be achieved through a series of centrifugations of the material in a sacharose solution of at least 900 g/l. The number of individuals appearing in the supernatant after each centrifugation forms a geometric series, with a ratio which is dependent on the amount of material, the concentration of the saccharose solution, and the acceleration of the centrifuge. Knowledge of this ratio allows an estimation of density after only one centrifugation. More than 90 % of the animals present in the sample can be extracted after only two centrifugations.
Tipo: Info:eu-repo/semantics/article
Ano: 1974 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3492
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A rapid method to evaluate nematode density OMA
Heip, C.H.R..
Tipo: Info:eu-repo/semantics/article
Ano: 1974 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3493
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A re-evaluation of marine nematode productivity OMA
Vranken, G.; Herman, P.M.J.; Vincx, M.; Heip, C.H.R..
Nematodes are the most abundant multicellular animals in marine sediments but their role in the benthos has not been properly quantified yet. In nearly all energy-flow budgets of marine systems their annual production P is given as about nine times their biomass B and their part in the total energy-flow is consequently estimated as anywhere between 3 and 30% of the total (carbon) input in the benthic system. Our laboratory experiments demonstrate that nematode productivity is much higher than P/B ~ 9 per year and may reach values of over 60 for bacterial grazers. To obtain more reliable estimates for field populations we propose a regression equation relating egg-to-egg development time T<sub>min</sub> to temperature (t) and adult female weight...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological production; Mathematical models; Meiobenthos; Nematoda [Nematodes].
Ano: 1986 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3576
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Analysis of community attributes of the benthic meiofauna of Frierfjord-Langesundfjord OMA
Heip, C.H.R.; Warwick, R.M.; Carr, M.R.; Herman, P.M.J.; Huys, R.; Smol, N.; Van Holsbeke, K..
Tipo: Info:eu-repo/semantics/article
Ano: 1988 URL: http://www.vliz.be/imisdocs/publications/221038.pdf
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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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Assessing organic matter mineralization, degradability and mixing rate in an ocean margin sediment (Northeast Atlantic) by diagenetic modeling OMA
Soetaert, K.; Herman, P.M.J.; Middelburg, J.J.; Heip, C.H.R..
We test whether organic matter degradability, mixing activity, and total sediment mineralization can be estimated by inversion of a coupled nonlinear numerical steady-state diagenetic model. We use a single data set comprising oxygen, nitrate, ammonium and organic carbon versus depth profiles from a slope station in the Goban Spur area (1034 m, Northeast Atlantic). Based on an extensive sensitivity analysis, it appears that (1) when using all data, the total mineralization rates can be determined with reasonable precision; bioturbation and degradability are less well constrained and (2) total mineralization rates can be determined based on nitrate and oxygen profiles only; estimates of organic matter mixing rates and degradability are refined when...
Tipo: Info:eu-repo/semantics/article
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8426
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Benthic communities in the Southern Bight of the North Sea and their use in ecological monitoring OMA
Govaere, J.C.R.; Van Damme, D.; Heip, C.H.R.; De Coninck, L.A.P..
Macrobenthic and meiobenthic communities of an area off the Belgian coast of the North Sea were studied from 1970 until 1975 at 74 stations. On the basis of both macro- and meiobenthos, three zones can be distinguished in the area. The coastal zone is characterized by the macrobenthic <i>Abra alba</i> community, corresponding to the meiobenthic <i>Microarthridion littorale</i>-<i>Halectinosoma herdmani</i> community, and the open sea zone by the macrobenthic <i>Venus gallina</i> community and the meiobenthic <i>Leptastacus laticaudatus-Paramesochra helgolandica</i> community. In between is a transient zone where elements of both other zones mix. The distribution of these zones is governed by the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos Abra alba (W. Wood; 1802) [White furrow shell] Molluscs ANE; Belgium ANE; North Sea; Southern Bight.
Ano: 1980 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3661
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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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Calculation of the intrinsic rate of natural increase, r<sub>m</sub>, with <i>Rhabditis marina</i> Bastian 1865 (Nematoda) OMA
Vranken, G.; Heip, C.H.R..
The life-cycle of <i>Rhabditis marina</i> Bastian 1865 was studied at 25°C and 20 promille salinity. The following demographic parameters were computed from life-table data: the intrinsic rate of natural increase (r<sub>m</sub>) = 0.914 day; net reproductivity (R<sub>0</sub>) = 400; minimum generation time (T<sub>min</sub>) = 4.5 days; cohort generation time (T<sub>c</sub>) = 7.2 days; mean generation time (T) = 6.6 days; and the age of an adult female when a median egg is deposited (T) = 6.1 days. Several approximate equations used to estimate r<sub>m</sub> were compared with these life-table calculations. Some give erroneous estimations and should be used with extreme caution. For...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Population characteristics; Nematoda [Nematodes]; Rhabditis marina.
Ano: 1983 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3260
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Community structure and functional roles of meiofauna in the North Sea OMA
Heip, C.H.R.; Huys, R.; Alkemade, R..
Knowiedge on community structure of North Sea meiofauna has greatly increased recently. A quasisynoptic picture of meiofauna densities and copepod community structure from 171 stations of the southern North Sea, sampled in April–May 1986, has been obtained during the North Sea Benthos Survey. Latitudinal patterns in meiofauna abundance and copepod weight, abundance and diversity exist in an area between 51°30'N and 58°30'N. Using TWINSPAN-classification five major groups of copepod species can be recognized which are related to sediment type, latitude and depth. The part of the meiofauna in total benthic energy flow, their role in the benthic food web and in biogeochemical cycles is discussed based on existing literature. There are still considerable gaps...
Tipo: Info:eu-repo/semantics/article
Ano: 1992 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7245
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Comparing species diversity and evenness indices OMA
Heip, C.H.R.; Engels, P..
In a low diversity brackish water habitat the diversity of the copepod community is best measured with the Shannon-Wiener information function and its evenness by an index proposed by the first author (<i>e<sup>H</sup></i> -1)/(<i>S</i> -1). This was shown by comparing the statistical behaviour of the more important diversity and evenness indices currently used.
Tipo: Info:eu-repo/semantics/article
Ano: 1974 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3491
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Data to be considered in descriptions of new species or redescriptions of poorly known species (addendum 2) OMA
Coomans, A.; De Coninck, L.A.P.; Heip, C.H.R..
Tipo: Info:eu-repo/semantics/article
Ano: 1978 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6986
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De diversiteit van nematodengemeenschappen en het kompetitief exclusiebeginsel OMA
Heip, C.H.R..
Tipo: Info:eu-repo/semantics/article
Ano: 1976 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6963
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De vrijlevende mariene nematoden van de Spuikom OMA
Thielemans, L.; Verdonckt, M.; Heip, C.H.R..
Tipo: Info:eu-repo/semantics/article
Ano: 1978 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8022
Registros recuperados: 107
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