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| Registros recuperados: 44 | |
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| González López, C.A.. |
| Se estudió la biodiversidad vegetal acuática y palustre de la Laguna Coluco que forma parte de los Humedales del río Chepu (Chiloé, Chile). La hoya hidrográfica del río Chepu comprende la laguna Coluco y los tributarios de la cuenca: ríos Huentru, Negro, Puntra, Grande, Coluco, abarcando aproximadamente 100 km^2. Los muestreos de terreno se realizaron con la metodología fitosociológica de la Escuela Zürich – Montpellier. Con los censos de vegetación levantados a lo largo del transecto, se confeccionó una tabla fitosociológica inicial con 120 censos y 88 especies vegetales. Esta tabla fue ordenada con los métodos tradicionales, lográndose determinar las 16 asociaciones siguientes: Myriophylletum aquaticum, Potametum pectinatii, Juncetum bulbosii, Potametum... |
| Tipo: Theses and Dissertations |
Palavras-chave: Biodiversity; Community composition; Wetlands; Vegetation cover; Aquatic plants. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/4916 |
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| Antacli, J.C.. |
| This Thesis contributes to elucidate the life cycle strategies of two copepod species, the medium-size clausocalanid Drepanopus forcipatus Giesbrecht, 1888 and the large calanid Calanus australis Brodsky, 1959, in relation to the environmental conditions in the southern Patagonian shelf (47°-55°S). This research was mainly carried out with samples collected in late summer/early autumn (March/April, 2004) onboard RV "Dr. E. L. Holmberg" (INIDEP, Mar del Plata). An additional sampling performed during early spring (October, 2005) with RV "Puerto Deseado" (CONICET) was also utilized. The present study was based on the following research questions: 1) Which is the available food for copepod populations by late summer? 2) Which is the relative contribution of... |
| Tipo: Theses and Dissertations |
Palavras-chave: Zooplankton; Trophic levels; Population structure; Hydrography; Community composition. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4205 |
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| Martínez, S.; Acosta, A.. |
| Several predictions have been made, about magnitude and direction of temporal changes in the coral community structure, during the last decade. However, few studies have demonstrated it quantitatively. In order to document such changes, the coral community structure was studied in four continental reefs in the Colombian Caribbean, two in the Santa Marta region: Punta Betín (PB) and Morro Grande Island (MO), and two in the Tayrona National Natural Park (PNNT): Granate cove (GR) and Gayraca bay (GA). Coral composition and cover were quantified in 2002 and compared to base line studies from 1989 (PB, MO & GR) and from 1992 (GA). These variables were quantified by 20 m linear transects between 1.5 m and 29 m depth. After a decade, all reefs lost in average... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Degradation; Temporal variations; Community composition; Coral reefs; Degradation; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2159. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/2012 |
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| Jaureguizar, A.J.. |
| The spatial and temporal changes of the fish assemblage areas composition at the coastal ecosystem of the western South Atlantic (34 degree -41 degree S) during six springs (1981, 1983, 1994, 1995, 1998 and 1999), were examined. For each assemblage area the most common species and those species that discriminate it from adjacent assemblages areas within years, were identified. Within each area, also resident (common in all years) and facultative (contributing to less than 90% of similarity within any year) species, were studied. Also were identified what parameters control the main structuring of the fish community on the spatial and temporal patterns. In order to determine how the environmental factors influenced the fish community structure, the... |
| Tipo: Theses and Dissertations |
Palavras-chave: Marine fish; Community composition; Coastal fisheries; Ecosystem management; Species diversity; Coastal zone; Ecological zonation; Environmental factors; Assemblages; Ecological zonation; Environmental factors; Coastal fisheries; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2465; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_33954. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1469 |
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| Missaoui, H.; El Abed, A.; M'rabet, R.; Romdhane, M.S.; Zarrad, R.; Jarboui, O.. |
| Monthly variability of zooplankton and ichthyoplankton abundance and composition were studied in 6 stations in the Gulf of Tunis between February 2003 and January 2004. Plankton trawls were horizontal, in surface and at night. Study area seems to be influenced by climatic conditions and the outflow of Majreda River that affect the surface temperature and salinity. Copepods, with many abundance peaks in the year, formed the most abundant group (84%) followed by cladocerans (8%) and chaetognaths (3%). The appendicularians, cladocerans and medusae had swarms in the summer, the creseis and the chaetognths in the autun and the zoae larvae in the spring. The highest fish spawning periods was in summer then the highest larva abundance was in winter and... |
| Tipo: Journal Contribution |
Palavras-chave: Community composition; Fish larvae; Ichthyoplankton; Temporal variations; Zooplankton; Zooplankton; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2924. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/4242 |
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| Kogan, M.. |
| Species composition, abundance and spatial distribution of microzooplancton (20-200 km)from the Río de la Plata Estuary, Argentina-Uruguay, SW Atlantic (36°S 56°W)were studied from samples collected during two oceanographic cruises at the end of austral spring (in 1999 and 2001)across a gradient from fluvial to coastal waters (200 km). Heterotrophic dinoflagellates, aloricate ciliates, tintinnids, radiolarians, rotifers and copepod nauplii were found. More than 110 taxa were registered, 35 were new records for the area. Three microzooplanktonic assemblages were distinguished using cluster analysis. Species and groups spatial distribution (horizontal and vertical)was related to the distribution of the maxima gradients (salinity, turbidity, etc.), estuarine... |
| Tipo: Theses and Dissertations |
Palavras-chave: Zooplankton; Abundance; Geographical distribution; Salinity stratification; Ecological associations; Brackishwater environment; Community composition; Vertical distribution; Zooplankton; Geographical distribution; Ecological associations; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32845; Http://aims.fao.org/aos/agrovoc/c_1050. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/2598 |
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| Negri, R.M.; Silva, R.I.; Segura, V.; Cucchi Colleoni, A.D.. |
| The El Rincón area in the Argentine continental shelf (coastal sector between 39º S-41º S) is known as one of the main breeding areas of the Argentine anchovy (Engraulis anchoita) Northern stock. However, there is scarce information regarding the structure of the primary producers, base of the pelagic food webs. The aim of this study was to identify the different phytoplanktonic communities in a coastal section in the area (depth lower than 60 m) during February 2011. Mean surface chlorophyll a concentration was 0.72 mg m-3, with the highest value in the innermost station (E34: 1.84 mg m-3) and the lowest in the mid section (E31: 0.24 mg m-3). In depth, similar concentrations were registered, except for the deepest station where the maximum value was... |
| Tipo: Journal Contribution |
Palavras-chave: Phytoplankton; Nannoplankton; Community composition; Size; Chlorophylls. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5491 |
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| Yasindi, A. W.; Taylor, W. D.. |
| Planktonic ciliates were studied in 17 tropical East African lakes of different salinity and trophic status. Oligotrichs (e.g., Strombidium, Strobilidium and Halteria) and scuticociliates (e.g., Cyclidium, Pleuronema, Cristigera), dominated the ciliate communities. Conductivity and trophic status were the most important environmental variables influencing the distribution of ciliate species in East African lakes. Herbivorous oligotrichs were important in oligotrophic and mesotrophic lakes, as they are in temperate and subtropical lakes, but their importance decreased with increasing chlorophyll a concentration and conductivity. On the other hand, the importance of scuticociliates (primarily bacterivores) increased with increasing chlorophyll a and... |
| Tipo: Proceedings Paper |
Palavras-chave: Freshwater lakes; Abundance; Biomass; Pelagic environment; Salinity; Plankton; Community composition; Oligotrophic lakes; Aquatic communities; Regression analysis; Tropical lakes; Species diversity; Plankton; Freshwater. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/5311 |
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| 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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| Beyst, B.; Mees, J.; Cattrijsse, A.. |
| Early (post)larval fish constitute a significant part of the temporary hyperbenthos, i.e. of the fauna living in the lower reaches of the water column close to the substratum. Information on the densities and spatial and temporal variations of these stages, as well as on their lengths at the moment of occurrence, can be an important contribution to the knowledge of their dispersion, migrations and to the identification of possible bottlenecks in their recruitment. Therefore the hyperbenthos of the Voordelta, a shallow coastal zone in front of the Dutch Delta, as well as that of the subtidal channels and the intertidal brackish marsh creeks of the Westerschelde Estuary, was sampled monthly during one year by means of a sledge and a stow net. A total of 37... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community composition; Deltas; Dominant species; Ecological distribution; Estuaries; Intertidal environment; Juveniles; Marine fish; Nursery grounds; Pleuronectes; Population density; Salt marshes; Sprattus sprattus; Wetlands; Zoobenthos; Clupea harengus; Dicentrarchus labrax [Bass]; Solea solea [Sole]. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3979 |
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| Registros recuperados: 44 | |
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