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| Registros recuperados: 38 | |
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| Persoone, G.. |
| The displacement technique for measuring the volume of plankton catches is well established, and a number of papers have been published describing suitable apparatus for this purpose including those by Frolander (1957), and Yentsch & Hebard (1957). Gnanamuthu (1952) reviews several papers dealing with equipment for measuring the volume of small aquatic animals and discusses his own volumeter. The apparatus here described employs a water column and is, therefore, more convenient to handle than previous designs which used a mercury column. It is inexpensive and simple to construct, and will measure to 0.01 or even 0.005 ccm. We have found it most useful in quickly measuring the volume of polychaetes or oligochaetes, small bivalves, small crustaceans, etc. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Instruments; Marine invertebrates. |
| Ano: 1971 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3430 |
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| Sorgeloos, P.; Persoone, G.. |
| The 3 culturing devices described are based on the principle of the classic air-water lift, which facilitates continuous recirculation and aeration of the cultivation medium. The first device is a "circulation cylinder", convenient for hatching eggs of the brine shrimp <i>Artemia salina</i> and for culturing algae and protozoans. In the second device, an internal basket (i.e., a glass cylinder with plankton-gauze bottom) prevents the animals being carried along in the air-water lift. The third device, analogous to the second, is provided with a lateral waste-drain and a water collector with siphon, which empties regularly into the main culture vessel. The second and third devices proved to be excellent for the cultivation of a variety of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Fish larvae; Instruments; Marine invertebrates. |
| Ano: 1972 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3461 |
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| Blust, R.; Decleir, W.. |
| A flow-through test system for the study of toxicity and bioaccumulation processes is described. The apparatus can operate within a very wide range of flow rates. Flow deviations are less than 2% and the variation in test-agent concentration, (determined for copper) ranges from 3 to 8%. As a practical test a copper-toxicity experiment on adult <i>Artemia</i> was carried out and the results compared with data obtained from a similar but static assay. The results indicate that: - bioassay and accumulation experiments must preferably be carried out under flow-through conditions to keep the concentration and bioavailability of the toxicant as constant as possible;- the data analysis must be based upon measured test-solution toxicant-concentrations... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioaccumulation; Marine invertebrates; Toxicity tests. |
| Ano: 1984 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3261 |
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| Sankaré, Yacouba. |
| Nous avons déterminé, à partir d'une étude bibliographique et de nos observations sur le terrain quarante deux espèces animales comprenant essentiellement des mollusques et des insectes. Ces animaux s'attaquent aux plantes flottantes Eichhornia crassipes, Pistia stratiotes et Salvinia molesta. Ils consomment ou détruisent indifféremment les plantes précitées sauf Neochetina bruchi, Neochetina eichhorniae et Sameodes albiguttalis qui s'attaquent spécifiquement à E. crassipes; Neohydronomus putchellus, Lanistes guinaicus et Pila africana broutent préférentiellement P. stratiotes; Cyrtobagous salviniae, Cyrtobagous singularis et Paulinia acuminata consomment uniquement S. molesta. |
| Tipo: Journal Contribution |
Palavras-chave: Aquatic plants; Marine invertebrates; Predators. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/5740 |
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| Pittman, S.J.. |
| Typically, coral reefs are dominated by sedentary colonial organisms. Species compositions are temporally and spatially dynamic and populations may be seen to interact through similar mechanisms as those observed in terrestrial plant communities. In these areas, intense competition for limited niche space, selects for varied defensive and offensive strategies and reproductive life history traits. |
| Tipo: Report |
Palavras-chave: Marine parks; Marine invertebrates. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/906 |
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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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| FERNÁNDEZ,MIRIAM; BRANTE,ANTONIO. |
| The quantification of the costs associated with parental care of marine invertebrates requires a first and necessary step, which is the identification of the different forms of care exhibited by this group. Among marine invertebrates, provision of oxygen to the aggregation of embryos may be critical, although most evidence on the link between oxygen limitation and parental care is indirect. Species which show active behavior directed at providing oxygen to the brood offer a good model to establish the direct link between behavioural patterns and oxygen provision to the embryos, and to estimate the costs associated with this form of care. In this manuscript, we conducted a review of the current knowledge about oxygen limitation in embryos aggregations of... |
| Tipo: Journal article |
Palavras-chave: Reproduction; Brood care; Crabs; Oxygen; Marine invertebrates. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200003 |
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| Díaz Jaramillo, M.J.. |
| Se describe los principales aspectos morfológicos, reproductivos y de desarrollo larval de dos especies del género Prionospio, a partir de material colectado en la bahía de Corral y estuario del río Valdivia. Prionospio patagonica es un habitante común de fondos blandos, observándose principalmente al interior de los estuarios del Pacífico suroriental. A diferencia de descripciones morfológicas anteriores, esta especie presenta dos pares de ojos y no se observa una capa interna en sus ganchos encapuchados. La madurez sexual de estas especies, se produce a partir de los primeros meses de primavera, en donde se pueden encontrar hembras y machos con segmentos gametogénicos, aproximadamente a partir de individuos con más de 50 segmentos. Los gametos se... |
| Tipo: Theses and Dissertations |
Palavras-chave: Larval development; Marine invertebrates; Reproduction; Animal morphology. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/4915 |
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| Surot Navarro, E.A.. |
| El desarrollo embrionario y larval corresponden a fases importantes dentro del ciclo de vida de invertebrados marinos. Estudios relacionados al desarrollo embrionario de crustáceos son escasos y se enfocan principalmente en fecundidad, volumen y rendimiento reproductivo. La fisiología y bioquímica larval se ha estudiado con un poco más de detalle, aunque, el conocimiento de estas fases aún es escaso. El presente estudio analiza el desarrollo temprano de Lithodes santolla (Molina, 1782) y Petrolisthes laevigatus (Guérin, 1835) en términos de la fisiología y bioquímica durante el desarrollo, comparando ambas especies respecto al modo de desarrollo presente, planctotrofía (P. laevigatus) y lecitotrofía (L. santolla). Durante el desarrollo temprano se... |
| Tipo: Theses and Dissertations |
Palavras-chave: Marine invertebrates; Larval development; Embryonic development. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4918 |
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| Tapia Jopia, C.; Barahona Toledo, N.. |
| Pyura chilensis, es una especie de acidia solitaria que puede presentarse en el medio en forma individual, formando en parches o densas agregaciones. Estas agregaciones generan microhábitats donde habita una abundante y diversa epifauna, cumpliendo un papel importante en términos ecológicos. En Chile, las únicas fuentes que registran desembarques de este recurso son el Servicio Nacional de Pesca (SERNAPESCA) y el Instituto de Fomento Pesquero (IFOP). Ambas, utilizan métodos distintos de recopilación de datos y al analizar los datos registrados por ambas instituciones se observan diferencias, lo que da cuenta de la necesidad de un trabajo en conjunto que permita mejorar la información oficial disponible. |
| Tipo: Report |
Palavras-chave: Landing statistics; Marine fisheries; Marine invertebrates; Marine fisheries; Http://aims.fao.org/aos/agrovoc/c_4611. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/3110 |
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| Registros recuperados: 38 | |
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