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Registros recuperados: 34
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A model of nematode dynamics in the Westerschelde Estuary OMA
Li, J.; Vincx, M.; Herman, P.M.J..
We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].
Ano: 1996 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284
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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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A state of the art on meiofaunal respiration and production OMA
Moens, T.; Vincx, M..
The aerobic respiration of meiofauna in general and of nematodes in particular is studied by means of manometric (Cartesian or related divers) or electrode-based (polarographic electrodes) techniques. The former allow highly accurate measurements on individual or small batches of nematodes, while the latter, less sensitive technique allows rapid and highly reproducible measurements under a variety of abiotic conditions.Nematode respiration is commonly described in a power relation R = aW<sup>b</sup>, where b averages 0.75 and a represents a measure of metabolic intensity. Published estimates of total nematode community respiration are scant, but seem to agree on an average value of 61...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological production; Meiobenthos; Respiration.
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7318
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Carbon flows through meiobenthic nematodes in the Westerschelde Estuary OMA
Li, J.; Vincx, M.; Herman, P.M.J..
A time dynamic model was used to estimate carbon flows through nematodes in an intertidal benthic ecosystem in the Westerschelde Estuary, The Netherlands. The model calibrated the nematode biomass observed from March 1991 to February 1992. The forcing functions of the model included meiobenthos biomass, macrobenthos biomass, bacterial density, chlorophyll-a concentration, and other abiotic data such as temperature and day length. We estimate that the nematode population had a low level of standing stock 249 mg C m(-2), but a high level of carbon flow. It consumed 98 mg C m(-2) d(-1) and produced 22 mg C m(-2) d(-1). Defecation was 73 mg C m(-2) d(-1). Losses in respiration, excretion and natural death were only 3 mg C m(-2) d(-1). The annual P/B was 32 for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Degradation; Ecology; Marine nematodes; Meiobenthos; Respiration.
Ano: 1997 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7296
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Distribution quantitative de la meiofaune dans un milieu fortement anthropise : le vieux port de Bizerte (Tunisie) OceanDocs
Essid, N.; Mahmoudi, E.; Beyrem, H.; Aissa, P.; Hedfi, A..
The survey of sediment and hydrological parameters in the old harbor of Bizerte has revealed that this ecosystem knows a high anthropogenic pressure. In this area waters were characterized by weak contents in dissolved oxygen and sediments, rich in fine fraction, were loaded in hydrocarbons and in organic matter. The free-living nematodes, predominant taxa, responded to these disturbances by a significant decrease in their densities and their biomasses and had tendency, notably at the most isolated sites, to penetrate deeply to escape surface sediments highly loaded in hydrocarbons and in organic matter.
Tipo: Journal Contribution Palavras-chave: Hydrocarbons; Pollution effects; Pollution indicators; Meiobenthos; Harbours; Man-induced effects; Bioindicators; Hydrocarbons; Http://aims.fao.org/aos/agrovoc/c_3719.
Ano: 2003 URL: http://hdl.handle.net/1834/1115
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Estructura de las comunidades de la meiofauna de la Bahía de Nipe, Cuba OceanDocs
Cuervo, Z.; Armenteros, M.; Capetillo, N.; Arencibia, G.; Pérez, I.; González, G..
The structure of meiofaunal communities was surveyed in 17 stations in Nipe Bay, Cuba in July, 2001. Levels of Nickel (all stations) are higher than in several bays in Cuba, probably due to natural causes. The levels of Copper, Zinc, Fe and Manganese indicate a relative low pollution, likely related to the presence of urban settlements. There is decrease in the total density and number of taxa of meiofauna in the stations with higher levels of metals; the copepods appear to be particularly sensitivity to metal pollution. The stations located at the mouth of the bay have the lowest levels of contamination and the highest total density of organisms and taxa richness, probably due to a more intense turnover of the waters in this area and consequent lower...
Tipo: Proceedings Paper Palavras-chave: Heavy metals; Meiofauna; Meiobenthos; Heavy metals; Meiobenthos.
Ano: 2006 URL: http://hdl.handle.net/1834/2173
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Estudio del meiobentos en el Golfo de Guayaquil, (Río Guayas, Canal Cascajal y Estero Salado), Ecuador, en agosto de 1996 OceanDocs
Cruz, M..
Con este aporte al conocimiento de la meiofauna del Golfo de Guayaquil, se pretende comenzar a difundir los diferentes grupos de organismos que antes de este trabajo no se conocían que existían en nuestro país, esperando que se incentiven nuevos trabajos de investigación en el campo de la meiofauna, para llegar a saber realmente las especies que tenemos en el ecosistema más "rico y/o productivo" del Ecuador y del Pacífico Sud-este.
Tipo: Journal Contribution Palavras-chave: Meiobenthos; Sediments; Rivers; Marshes; Estuaries; Rivers; Estuaries; Meiobenthos; Marshes; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_12481; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 1998 URL: http://hdl.handle.net/1834/2306
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Feeding biology of a predatory and a facultatively predatory nematode (<i>Enoploides longispiculosus</i> and <i>Adoncholaimus fuscus</i>) OMA
Moens, T.; Verbeeck, L.; Vincx, M..
This paper reports on the feeding biology of a predatory and of a facultatively predatory nematode, <i>Enoploides longispiculosus</i> and <i>Adoncholaimus fuscus</i>, respectively. Both species represent genera which are common and abundant in the littoral of the North Sea and in adjacent estuaries. Observations on the foraging behaviour of both species are given, and for the former species, a range of prey from its natural habitat is identified. Respiration was determined using a polarographic oxygen electrode technique and compared to consumption determined as predation rates on the monhysterid nematode <i>Diplolaimelloides meyli</i>. The daily C-loss due to respiration accounted for 15% of the measured C-consumption...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon; Communities; Communities; Communities; Ecology; Flat; Food; Marine; Meiobenthos; Water.
Ano: 1999 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7336
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Linking estuarine nematodes to their suspected food: a case study from the Westerschelde estuary (south-west Netherlands) OMA
Moens, T.; Van Gansbeke, D.; Vincx, M..
The present study investigates correlations between abundances of nematodes (at the genus level) and benthic microalgae on an intertidal mudflat in the Westerschelde Estuary (south-west Netherlands), using both multi- and univariate methods. Two sample series, covering surface areas of 10 cm(2) (meioscale) and 1.25 cm(2) (microscale) per sample were analysed. Trophic type analysis indicated that an average of 31% of the nematode community were candidate grazers of microalgae. Multivariate data analysis indicated that only a limited part of the variation in the nematode data could be explained in relation to pigments. Total nematodes did not show any correlation with the pigment data. On the meioscale, the genera <i>Tripyloides</i> and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecology; Marine nematodes; Meiobenthos; Populations; Populations; Scale; Scale; Bacteria.
Ano: 1999 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7332
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Meiobenthos as a tool in the assessment of marine environmental quality OMA
Heip, C.H.R..
The assessment of the impact of pollution on the marine environment depends on the possibility of prediction either by comparison or more ideally by the analysis of time series which are long enough. Obtaining data for the construction of these time series should be one of the principal goals of monitoring. Parameters which are measured should have a low variability in time and in space or low frequency. The analysis of meiobenthic communities in the North Sea and the adjacent estuaries shows that harpacticoid copepods are especially suitable as the number and the nature of the species are stable and density, biomass, and diversity are characterized by the absence of variance in the high frequencies. Nematodes, though overwhelmingly abundant, are more...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental assessment; Meiobenthos; Quality control.
Ano: 1980 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3682
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Meiobenthos of the central Arctic Ocean with special emphasis on the nematode community structure OMA
Vanreusel, A.; Clough, L.M.; Jacobsen, K.; Ambrose, W.; Jivaluk, J.; Ryheul, V.; Herman, R.; Vincx, M..
We investigated the abundance of the meiobenthos and the biomass and community structure of the nematodes in the central Arctic Ocean along two separate transects during 1991 and 1994. Meiobenthos abundances ranged from < 100 to 600 individuals per 10 cm², in the same order of magnitude as in other oligotrophic areas of the world's deep ocean. Nematodes were the numerically dominant meiofaunal group at every station. Nematode biomass ranged from < 1 to 48 µg dry weight per 10 cm². A combination of water depth and latitude explained 55% of the variability among stations in nematode biomass and 67% of the variability of total abundance, implying that both vertical and advective fluxes are important sources of food to the meiofaunal communities. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Community composition; Marine invertebrates; Meiobenthos; Spatial variations; Zoobenthos; Monhystera; Nematoda [Nematodes]; Pitcairn I..
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7425
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Meiofauna del Golfo de Guayaquil, Ecuador (Río Guayas, Canal Cascajal y Estero Salado), obtenida en abril de 1997 OceanDocs
Cruz, M..
El presente trabajo es la segunda contribución en el Ecuador, al mejor conocimiento de la meiofauna bentónica del Golfo de Guayaquil.
Tipo: Journal Contribution Palavras-chave: Meiobenthos; Invertebrate zoology; Species diversity; Marshes; Rivers; Environmental factors; Rivers; Environmental factors; Species diversity; Marshes; Meiobenthos; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_4631; Http://aims.fao.org/aos/agrovoc/c_12481.
Ano: 2002 URL: http://hdl.handle.net/1834/2308
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Metazoan meiofaunal communities at cold seeps along the Norwegian margin: Influence of habitat heterogeneity and evidence for connection with shallow-water habitats ArchiMer
Van Gaever, Saskia; Olu, Karine; Derycke, Sofie; Vanreusel, Ann.
Cold-seep environments and their associated symbiont-bearing megafaunal communities create islands of primary production for macro- and meiofauna in the otherwise monotonous and nutrient-poor deep-sea environment. To examine the spatial variation and distribution patterns of metazoan meiobenthos in different seepage-related habitats, samples were collected in two regions off Norway: several pockmarks associated with the Storegga Slide including the Nyegga pockmark area (730 m: 64 degrees N), and the active, methane-venting Hakon Mosby Mud Volcano (HMMV) west of the Barents Sea (1280 m: 72 degrees N). Based on sediment geochemistry and associated epifauna, three different habitat types were distinguished across the two regions: (1) reduced sediment with...
Tipo: Text Palavras-chave: Terschellingia longicaudata; Halomonhystera disjuncta; Cryptic species; Nematodes; Meiobenthos; Cold seeps.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7484.pdf
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Nematode communities associated with tubeworm and mussel aggregations on the East Pacific Rise ArchiMer
Zekely, J; Gollner, S; Van Dover, C; Govenar, B; Le Bris, Nadine; Nemeschkal, H; Bright, M.
The meiobenthic nematode community of three different vent sites at the East Pacific Rise was studied in order to determine whether the abundance, species richness, diversity and trophic structure were similar. The sites Tica and Riftia Field were dominated by the tubeworm, Riftia pachyptila, and the Buckfield site was dominated by the mussel Bathymodiolus thermophilus. The nematode communities of all three sites were low in abundance (< 1 up to 46 ind. 10 cm(-2)), except one sample from Tica with almost 1000 ind. 10 cm(-2). The communities at all sites consisted entirely of primary consumers, mostly deposit feeders. Species richness and Shannon-Wiener diversity indices were low and similar at both tubeworm sites and slightly but significantly higher at...
Tipo: Text Palavras-chave: East Pacific Rise; Bathymodiolus thermophilus; Riftia pachyptila; Nematodes; Meiobenthos; Hydrothermal vent.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3608.pdf
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Nematodes as indicators pollution: a case study from the Swartkops River system, South Africa OMA
Gyedu-Ababio, T.; Furstenberg, J.P.; Baird, D.J.; Vanreusel, A..
Nematodes from the sediments of the Swartkops estuary in Port Elizabeth, South Africa were investigated at 10 selected sites along a salinity gradient in the subtidal region at neap tide. The relation between nematode density, genera, community structure and environmental parameters including concentrations of seven heavy metals, Mn, Ti, Cr, Pb, Fe, Sn and Zn in the sediment were investigated. The nematode community structure was significantly influenced by the chlorophyll a concentration and sediment particle-size distribution. The number of genera had significant negative correlation with chlorophyll a and two heavy metals, Fe and Zn in the sediment. The habitat preferences of the genera were also assessed. A combination of the Shannon-Wiener Diversity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Check lists; Density; Diversity; Ecology; Meiobenthos; Pollution; Sediment; Sediments; Nematoda [Nematodes].
Ano: 1999 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7328
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Nueva distribución de moluscos meiobentónicos (Gasterópoda: Familia Caecidae), en la costa ecuatoriana, 2006 OceanDocs
Cruz, M..
El propósito de este trabajo tiene como finalidad reportar por primera vez, la presencia de esta familia Caecidae, los géneros Caecum y Elephantanellum, y siete especies para aguas ecuatorianas ampliando la distribución de estos micromoluscos desde el norte y centro América hasta Ecuador.
Tipo: Journal Contribution Palavras-chave: Meiobenthos; Marine molluscs; Geographical distribution; Species diversity; New records; Geographical distribution; Meiobenthos; Species diversity; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_12481; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2007 URL: http://hdl.handle.net/1834/2344
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Observations on the feeding ecology of estuarine nematodes OMA
Moens, T.; Vincx, M..
Observations on living estuarine nematodes show that previous feeding type classifications do not accurately represent the trophic structure of an intertidal mudflat in the Westerschelde Estuary (Netherlands). A new scheme with six major nematode feeding guilds is proposed: (1) microvores; (2) ciliate feeders; and (3) deposit feeders sensu stricto are all nematodes without a distinct buccal armature. In the first two groups bacteria and protozoa, respectively are the major particulate food sources, while other items are included in the diet of the third. The three other categories are recognized among the nematodes with a buccal armature: (4) epigrowth feeders; (5) facultative predators; and (6) predators. Diatoms and other microalgae are an important...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biology; Biomass; Carbon; Habits; Habits; Meiobenthos; Water.
Ano: 1997 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7298
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Observations préliminaires recueillies dans l'exécution des programmes entrepris par la station biologique de Roscoff ArchiMer
Bergerard, S..
We have tried to expose here the first observations on the basis of , previous knowledge and studies in progress when the wreck arrived, in particulary of benthic Populations Dynamics by the workers of the Biological Station. These results, still very fragmentary, allow never the less to definite the programs required for the second phase, essentially on the populations of fine deposits of the Morlaix and Lannion bays.
Tipo: Text Palavras-chave: Pollution; Hydrocarbures; Amoco Cadiz; Sédiments; Phytoplancton; Macrobenthos; Meiobenthos; Microbenthos; Baie de Morlaix; Baie de Lannion; Pollution; Hydrocarbons; Amoco Cadiz; Sediments; Phytoplancton; Macrobenthos; Meiobenthos; Microbenthos; Morlaix Bay; Lannion Bay.
Ano: 1978 URL: http://archimer.ifremer.fr/doc/00306/41725/40936.pdf
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On the evolution of reproductive potentials in a brackish water meiobenthic community OMA
Heip, C.H.R..
The realized and intrinsic rates of increase of several meiobenthic populations are compared. The realized rate of increase is remarkably similar among four species of copepods, which leads to the conclusion that dominance is not a function of rate of increase or parameters influencing this rate. The result is investigated in the light of Vandermeer's (1975) Beta-competition. There is also a remarkable agreement between the values of the predator <i>Protohydra leuckarti</i> and its principal prey <i>Tachidius discipes</i>. The intrinsic rates of natural increase vary more, but are a linear function of temperature in all species investigated. This is in agreement with the theory that natural selection acts against nonlinear dynamic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brackish water; Meiobenthos.
Ano: 1977 URL: http://www.vliz.be/imisdocs/publications/125861.pdf
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Problems in meiofauna energy-flow studies OMA
Herman, P.M.J.; Vranken, G.; Heip, C.H.R..
The direct estimation of energy flow through marine meiobenthic populations poses several difficulties, mainly relating to sampling problems. The usefulness of some indirect estimation methods is discussed. Direct production estimates and respiration measurements for three brackish water crustacean populations are given, indicating a relative constant proportion between population production and respiration.The production: assimilation ratio for these populations fluctuates between 0.3 and 0.4. This is contrasted to literature data revealing much higher production: assimilation ratios as determined in the laboratory for nematode populations. Using data on laboratory cultures of the nematode <i>Monhystera disjuncta</i> some factors that can...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy flow; Meiobenthos.
Ano: 1984 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3265
Registros recuperados: 34
Primeira ... 12 ... Última
 

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