Consulta: subjectFacets:"Meiobenthos"
Registros recuperados: 35
Data/hora: 06/06/2024 10:28:14

Таксономический   состав   и   сезонная   динамика   мягкораковинных фораминифер в Севастопольской бухте (Чёрное море)
Provedor de dados: 13
Autores: Аникеева, О. В.
Рассмотрены состав и особенности распределения мягкораковинных фораминифер на исследуемых станциях в Севастопольской бухте в течение года. Вычислена их доля в общем количестве мейобентоса. Впервые получены данные по сезонной динамике черноморских мягкораковинных фораминифер.
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Seasonal variations; Meiobenthos; Http://aims.fao.org/aos/agrovoc/c_12481.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/601

Есть ли животная жизнь на больших глубинах Чёрного моря?
Provedor de dados: 13
Autores: Заика, В. Е.
Обсуждаются находки представителей эукариот микро- и мейобентоса на дне континентальных склонов и ложа Чёрного моря. Эти находки необычны для заражённой сероводородом зоны и противоречат укоренившимся представлениям: 1) об отсутствии жизни, кроме бактериальной, на глубинах Чёрного моря, и 2) о невозможности жизни в среде, содержащей сероводород. Приведена краткая история изучения глубин Чёрного моря. Даётся комментарий к находкам Н. Г. Сергеевой. Приводятся доводы, почему эти находки не могут быть трупами, занесёнными из верхней, аэрируемой части моря. Дан обзор литературы по находкам эукариот в других аноксических биотопах, содержащих сероводород, а также сведения о стратегиях животных мейобентоса по детоксикации сероводорода.
Tipo: Journal Contribution
Palavras-chave: Бентос склона и ложа; Микробентос; Мейобентос; Чёрное море; Benthos of bottom bed and slope; Microbenthos; Meiobenthos; Black Sea; Бентос схилу та ложа; Мікробентос; Чорне море.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/827

Таксономический состав и количественное развитие мейобентоса рыхлых грунтов в условиях марикультуры Mytilus galloprovincialis Lam., 1819
Provedor de dados: 13
Autores: Лысых, Н. М.
Изучена сезонная динамика таксономического состава и плотности поселений мейобентоса рыхлых грунтов в условиях мидийного хозяйства в б. Казачья (район г. Севастополя, Черное море). Отмечены представители 16 крупных таксонов при доминировании Nematoda, Harpacticoida и Foraminifera. Обнаружены пики плотности поселения мейобентоса для исследованных станций под мидийной фермой в летний, осенний и зимний периоды, в контрольной точке - в весенне-летний период. Отличия в таксономическом составе мейобентоса района мидийной фермы и контрольной станции не наблюдались. Полученные данные по таксономической структуре, количественному развитию мейобентоса в целом и его лидирующих групп, показателей соотношения численности нематод и копепод (N/C ratio) свидетельствуют об...
Tipo: Journal Contribution
Palavras-chave: Мейобентос; Нематодно-копеподное соотношение; Мидия; Марикультура; Meiobenthos; Nematode / copepod ratio; Mussel; Mariculture Mussel culture Meiobenthos Meiobenthos http://aims.fao.org/aos/agrovoc/c_12481.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/231

Мейобентос восточной части Азовского моря в весенний период 2001г.
Provedor de dados: 13
Autores: Сергеева, Н. Г.; Буркацкий, О. Н.
Рассмотрены особенности современной структуры мейобентоса восточной части Азовского моря. В весенний период мейобентос представлен животными 13 крупных таксонов. Из двух компонентов мейобентоса - эвмейобентоса и псевдомейобентоса - на всей исследованной акватории Азовского моря преобладал первый, как по численности, так и биомассе. Приведенные данные свидетельствует о значимой роли этой компоненты донных биоценозов в продуктивности Азовского моря.
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Meiobenthos; Http://aims.fao.org/aos/agrovoc/c_12481.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/501

Мейобентос  Балаклавской бухты  (Чёрное море)
Provedor de dados: 13
Autores: Гусева, Е. В.
Приведены данные по плотности и групповому разнообразию мейобентосного населения Балаклавской бухты по материалам съёмки в июле 2005 г. Рассмотрено пространственное распределение мейобентоса по бухте, а также по градиенту концентрации в донных осадках хлороформ-растворимых веществ (Ахл).
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Population density; Meiobenthos; Population density; Http://aims.fao.org/aos/agrovoc/c_12481; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/581

Мейобентосное население прибрежных наносов региона Севастополя  (Чёрное море)
Provedor de dados: 13
Autores: Гусева, Е. В.
Рассмотрены состав и численность мейобентосного сообщества прибрежных наносов на полигонах в акватории Севастополя в летние сезоны  2001 – 2003 гг. Качественно-количественные характеристики мейобентоса наносов урезной зоны б. Круглая в 2003 г. сопоставлены с таковыми в пробах донных осадках с глубин 1,5 – 2 м за этот же период.
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Population density; Population structure; Population structure; Meiobenthos; Population density; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_12481; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/582

Observations préliminaires recueillies dans l'exécution des programmes entrepris par la station biologique de Roscoff
Provedor de dados: 5
Autores: 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

Meiofauna Community in Soft Sediments at TAG and Snake Pit Hydrothermal Vent Fields
Provedor de dados: 5
Autores: Spedicato, Adriana; Sánchez, Nuria; Pastor, Lucie; Menot, Lenaick; Zeppilli, Daniela.
The risk assessment of seafloor massive sulfide (SMS) mining on meiobenthic organisms, specifically on soft-sediment meiofauna, is impeded by a lack of knowledge on the biology and ecology of these communities. In this study, we investigated sediment samples taken in proximity of active vents at Trans-Atlantic Geotraverse (TAG) and Snake Pit, two hydrothermal vent fields of the Mid-Atlantic Ridge, in order to explore metazoan meiofauna, particularly nematode community, and its relation to organic carbon, total nitrogen, total sulfur, and dissolved oxygen. Organic carbon and nitrogen contents were low at both sites. High concentrations of total sulfur and low oxygen penetration were found at Snake Pit compared to TAG. Snake Pit showed approximately four...
Tipo: Text
Palavras-chave: Meiobenthos; Nematoda; Mid-Atlantic Ridge; Seafloor massive sulfides; Biodiversity.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74061/73507.pdf

Nematode communities associated with tubeworm and mussel aggregations on the East Pacific Rise
Provedor de dados: 5
Autores: 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 (&lt; 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

Tubeworm-associated permanent meiobenthic communities from two chemically different hydrothermal vent sites on the East Pacific Rise
Provedor de dados: 5
Autores: Gollner, Sabine; Zekely, Julia; Govenar, Breea; Le Bris, Nadine; Nemeschkal, Hans L.; Fisher, Charles R.; Bright, Monika.
The permanent meiobenthic community associated with aggregations of the tubeworm Riftia pachyptila was characterized at 2 different hydrothermal vent sites, Tica and Riftia Field, on the East Pacific Rise near 9 degrees 50'N. The maximum effluent temperatures were similar at both sites, but the chemistry of the hydrothermal fluids differed between sites. The abundance of meiobenthos was very low in 5 out of 6 samples (&lt;61 ind. 10 cm(-2)) and was higher at Tica (20 to 976 ind. 10 cm(-2)) than at Riftia Field (&lt; 1 to 12 ind. 10 cm(-2)). Meiobenthos abundance was positively correlated with the volume of sediment within the tubeworm aggregations. Sediment consisted mainly of particulate organic material and contained only a few mineral grains. A total of...
Tipo: Text
Palavras-chave: Riftia pachyptila; Community study; Copepods; Nematodes; East Pacific Rise; Hydrothermal vent; Meiofauna; Meiobenthos.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2623.pdf

Metazoan meiofaunal communities at cold seeps along the Norwegian margin: Influence of habitat heterogeneity and evidence for connection with shallow-water habitats
Provedor de dados: 5
Autores: 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

Estudio del meiobentos en el Golfo de Guayaquil, (Río Guayas, Canal Cascajal y Estero Salado), Ecuador, en agosto de 1996
Provedor de dados: 20
Autores: 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

Nueva distribución de moluscos meiobentónicos (Gasterópoda: Familia Caecidae), en la costa ecuatoriana, 2006
Provedor de dados: 20
Autores: 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

Distribution quantitative de la meiofaune dans un milieu fortement anthropise  :  le vieux port de Bizerte (Tunisie)
Provedor de dados: 20
Autores: 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

Réponse des différents taxons méiofaunistiques à la contamination par un antibiotique (la Penicilline G) : étude microcosmique.
Provedor de dados: 20
Autores: Nasri, A.; Boufahja, F.; Hedfi, A.; Mahmoudi, E.; Aissa, P.; Essid, N.
Une étude microcosmique a été réalisée pour déterminer l’effet d’un antibiotique (la Pénicilline G) sur une communauté méiofaunistique prélevée au niveau des sédiments de la lagune de Bizerte (Nord de la Tunisie).Cinq doses croissantes de ce contaminant émergent (D1 : 3 mg.L-1, D2 : 30 mg. L-1, D3 : 300 mg. L-1, D4 : 600 mg. L-1 et D5 : 700 mg. L-1), ont été mises en examen pendant 30 jours d’exposition. Les densités méiofaunistiques moyennes ont été très fluctuantes en comparant les microcosmes témoins avec ceux traités. Les microcosmes témoins ont été associés à une densité moyenne de 91 ± 22 ind. mic-1. Une prolifération numérique de la méiofaune a été observée lors de son exposition aux doses les plus faibles du contaminant. Ainsi, une valeur moyenne...
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Density; Microcosms; Sediments.
Ano: 2013
URL: http://hdl.handle.net/1834/5907

Estructura de las comunidades de la meiofauna de la Bahía de Nipe, Cuba
Provedor de dados: 20
Autores: 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

Meiofauna del Golfo de Guayaquil, Ecuador (Río Guayas, Canal Cascajal y Estero Salado), obtenida en abril de 1997
Provedor de dados: 20
Autores: 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

Carbon flows through meiobenthic nematodes in the Westerschelde Estuary
Provedor de dados: 27
Autores: 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

Size spectra, body width and morphotypes of intertidal nematodes: an ecological interpretation
Provedor de dados: 27
Autores: Tita, G.; Vincx, M.; Desrosiers, G.
Nematode species from three intertidal assemblages (St Lawrence Estuary, Quebec, Canada) were studied in order to form an ecological interpretation of three allometric attributes: body width, size spectra, and morphotypes. The three assemblages were characterized by a very similar sediment grain median (Md) but different silt-clay proportions: A1 (upper-tidal level; Md=122 µm; silt=34.8%), A3 (mid-tidal level; Md=182 µm; silt=12.8%), and A5 (lower-tidal level; Md=122 µm; silt=6.8%). Silt-clay proportions were an influential factor in determining the mean nematode body width, used as a morphological discriminant between burrowing and interstitial organisms. A plot of the number of species vs the body width-classes showed two peaks: between 19.3 and 22.6 µm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Benthos; Biomass; Diversity; Meiobenthos; Transport.
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7340

Meiobenthos as a tool in the assessment of marine environmental quality
Provedor de dados: 27
Autores: 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

Observations on the feeding ecology of estuarine nematodes
Provedor de dados: 27
Autores: 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

Meiobenthos of the central Arctic Ocean with special emphasis on the nematode community structure
Provedor de dados: 27
Autores: 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 &lt; 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 &lt; 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

A re-evaluation of marine nematode productivity
Provedor de dados: 27
Autores: 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&lt;sub&gt;min&lt;/sub&gt; 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

A state of the art on meiofaunal respiration and production
Provedor de dados: 27
Autores: 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&lt;sup&gt;b&lt;/sup&gt;, 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

Linking estuarine nematodes to their suspected food: a case study from the Westerschelde estuary (south-west Netherlands)
Provedor de dados: 27
Autores: 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 &lt;i&gt;Tripyloides&lt;/i&gt; 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

Problems in meiofauna energy-flow studies
Provedor de dados: 27
Autores: 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 &lt;i&gt;Monhystera disjuncta&lt;/i&gt; 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

The predictability of biological populations and communities: an example from the meiobenthos
Provedor de dados: 27
Autores: Herman, P.M.J.; Heip, C.H.R.
The predictability of temporal changes was analysed in the population density of three meiobenthic copepod species, and for three parameters characterizing this community. For &lt;i&gt;Paranychocamptus nanus&lt;/i&gt; and &lt;i&gt;Tachidius discipes&lt;/i&gt; a large part of the variation in time scales longer than 1 year is explainable as cyclic factors. In &lt;i&gt;P. nanus&lt;/i&gt; clear cycles with periods of 2 years and 1.5 years were found. These cyclic factors can be extrapolated for prediction. In &lt;i&gt;Canuella perplexa&lt;/i&gt; almost all the variation was due to unpredictable long-term drift. Community parameters are generally better predicted than population densities. In our data set total density of the copepods was the best parameter to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meiobenthos; Monitoring; Prediction; Time series; Copepoda [copepods].
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3238

Nematodes as indicators pollution: a case study from the Swartkops River system, South Africa
Provedor de dados: 27
Autores: 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

Studies of the life-history and energetics of marine and brackish-water nematodes: 2. Production, respiration and food uptake by &lt;i&gt;Monhystera disjuncta&lt;/i&gt;
Provedor de dados: 27
Autores: Herman, P.M.J.; Vranken, G.
An energy budget was constructed for the marine nematode &lt;i&gt;Monhystera disjuncta&lt;/i&gt;. Respiration was measured with a modified Cartesian diver technique, in which the nematodes were kept in agar inside the diver 'head'. The relationship between respiration and body weight was: R=1.53 W&lt;sup&gt;0.75&lt;/sup&gt;. Body growth was exponential during the juvenile phase, with a growth rate equal to 0.61 d&lt;sup&gt;-1&lt;/sup&gt;. After maturation the growth rate fell to 0,17 d&lt;sup&gt;-1&lt;/sup&gt;. Food uptake was measured in experiments with radiolabeled bacteria. In one series of experiments the accumulation of radiolabel in the nematodes was followed. In a second series the decrease in labeling was followed when pre-labeled nematodes fed on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioenergetics; Brackishwater environment; Energy budget; Energy flow; Feeding; Life history; Meiobenthos; Respiration; Monhystera disjuncta; Nematoda [Nematodes].
Ano: 1988
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3146

The meiobenthos of subtidal sandbanks on the Belgian Continental Shelf (Southern Bight of the North Sea)
Provedor de dados: 27
Autores: Vanaverbeke, J.; Gheskiere, T.; Vincx, M.
The Belgian Continental Shelf (BCS) is characterized by a set of isolated subtidal sandbank systems, which greatly increase the habitat heterogeneity of the area. The meiobenthos of these sandbanks was investigated during 1997 and 1998. In total, 10 sandbanks have been sampled, belonging to three different geographically isolated systems: the Flemish Banks, the Hinder Banks and the Zeeland Banks. No obvious differences in sedimentological characteristics between the sandbanks were found, but biologically some differences could be detected. The more offshore Hinder Banks had the most diverse meiobenthos, while the Flemish Banks harboured the lowest number of meiobenthic taxa. Seasonal and regional differences in terms of densities are a result of a coupling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meiobenthos; Phytoplankton; Sand banks; Sediment properties.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=5343

On the evolution of reproductive potentials in a brackish water meiobenthic community
Provedor de dados: 27
Autores: 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 &lt;i&gt;Protohydra leuckarti&lt;/i&gt; and its principal prey &lt;i&gt;Tachidius discipes&lt;/i&gt;. 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

The importance of turbellarians in the marine meiobenthos: a review
Provedor de dados: 27
Autores: Martens, P.M.; Schockaert, E.R.
Recent data and opinions on meiofaunal ecology are briefly reviewed; and from scattered data, the place of turbellarians in the meiobenthic community is discussed. Turbellarian diversity is of the same magnitude higher in sandy habitats than in muddy bottoms. In sand, turbellarian diversity is of the same magnitude as that of other important meiofaunal taxa, while densities range between 7-25% of the total meiofauna. Mean individual turbellarian dry weight seems to be four times that of nematodes and in sandy habitats turbellarian biomass may be equal to or exceed that of nematodes. Most turbellarian species may be considered as predators and in this respect may take the place occupied by macrofaunal species in muddy sediments.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Fauna; Literature reviews; Meiobenthos; Turbellaria [Flatworms].
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3222

Studies of the life-history and energetics of marine and brackish-water nematodes: 1. Demography of &lt;i&gt;Monhystera disjuncta&lt;/i&gt; at different temperature and feeding conditions
Provedor de dados: 27
Autores: Vranken, G.; Herman, P.M.J.; Heip, C.H.R.
Aspects of the demography of &lt;i&gt;Monhystera disjuncta&lt;/i&gt; were investigated at different feeding conditions (monoxenic cultures with different bacterial strains, and different densities in the feeding suspension with one strain). Embryonic development time, minimum generation time, egg deposition rate and adult longevity depend on temperature, quality and quantity of food offered. Body mass at maturity is an allometric function of food density. It is shown that a previously inferred selectivity in food uptake is an artifact of culture conditions. pH buffering and addition of sterols permit culture of the species on a wide variety of bacterial strains. &lt;i&gt;M. disjuncta&lt;/i&gt; is less well adapted to take advantage of high food density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioenergetics; Brackishwater environment; Cultured organisms; Feeding; Life history; Marine environment; Meiobenthos; Temperature effects; Water temperature; Monhystera disjuncta.
Ano: 1988
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3159

Feeding biology of a predatory and a facultatively predatory nematode (&lt;i&gt;Enoploides longispiculosus&lt;/i&gt; and &lt;i&gt;Adoncholaimus fuscus&lt;/i&gt;)
Provedor de dados: 27
Autores: Moens, T.; Verbeeck, L.; Vincx, M.
This paper reports on the feeding biology of a predatory and of a facultatively predatory nematode, &lt;i&gt;Enoploides longispiculosus&lt;/i&gt; and &lt;i&gt;Adoncholaimus fuscus&lt;/i&gt;, 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 &lt;i&gt;Diplolaimelloides meyli&lt;/i&gt;. 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

A model of nematode dynamics in the Westerschelde Estuary
Provedor de dados: 27
Autores: 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