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| Registros recuperados: 24 | |
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| Grant, J; Bacher, Cedric; Cranford, P; Guyondet, T; Carreau, M. |
| A fully-coupled biological-physical-chemical model of a coastal ecosystem was constructed to examine the impact of suspended mussel culture on phytoplankton biomass in Tracadie Bay, Prince Edward Island, Canada. Due to the extent of mussel culture there, we hypothesised that shellfish filtration would control the concentration and distribution of phytoplankton and other suspended particles in the bay. Circulation was delineated with a tidally-driven 2D numerical model and used to drive an ecosystem model with a focus on pelagic components including phytoplankton production, nutrients, detritus, and mussels. The benthos were treated as a sink. Nutrients and seston were forced by tidal exchange and river input, with phytoplankton additionally forced by... |
| Tipo: Text |
Palavras-chave: Towed sensors; Nutrient dynamics; Circulation model; Phytoplankton; Carrying capacity; Shellfish aquaculture; Estuaries; Ecosystem model. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6951.pdf |
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| Guyondet, T.; Comeau, L. A.; Bacher, Cedric; Grant, J.; Rosland, R.; Sonier, R.; Filgueira, R.. |
| A spatially explicit coupled hydrodynamic-biogeochemical model was developed to study a coastal ecosystem under the combined effects of mussel aquaculture, nutrient loading and climate change. The model was applied to St Peter's Bay (SPB), Prince Edward Island, Eastern Canada. Approximately 40 % of the SPB area is dedicated to mussel (Mytilus edulis) longline culture. Results indicate that the two main food sources for mussels, phytoplankton and organic detritus, are most depleted in the central part of the embayment. Results also suggest that the system is near its ultimate capacity, a state where the energy cycle is restricted to nitrogen-phytoplankton-detritus-mussels with few resources left to be transferred to higher trophic levels. Annually, mussel... |
| Tipo: Text |
Palavras-chave: Climate change; Nutrient loading; Mussel culture; Carrying capacity; Coastal ecosystem; Numerical modelling. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00275/38624/37191.pdf |
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| FERNANDES, A. A. O.; MACHADO, F. H. F.; ANDRADE, J. M. de S.; MENEZES, F. A. B. de; CATUNDA, A. G.; FIGUEIREDO, E. A. P. de.. |
| Resumo: As taxas de parição, mortalidade de adultos e gemelidade de caprinos nativos e ovinos Morada Nova, foram avaliadas de 1977 a 1979, em três tipos de pastagens - Nativa de Caatinga, Nativa Raleada e de capim-buffel (Cenchrus ciliaris L.). O ensaio foi conduzido na Fazenda Iracema, da Empresa de Pesquisa Agropecuária do Ceará - EPACE -, em Quixadá, CE. As taxas de parição foram diferentes para anos, espécies, anos x espécies e espécies x pastagens. Os caprinos apresentaram 55,7%, 91,6% e 70,8% de parição e os ovinos, 89,1%, 85,2% e 86,9% em 1977, 1978 e 1979, respectivamente. A taxa de gemelidade foi significativamente maior nos caprinos (43,0%) que nos ovinos (25,8%). As taxas de mortalidade de adultos foram diferentes para anos, espécies, anos x... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Parição; Gemelidade; Pastagem nativa; Pastagem raleada; Capacidade de suporte; Gemelarity; Carrying capacity; Caprino; Ovino; Performance; Ganho de Peso; Mortalidade; Parto; Pastagem nativa; Cenchrus ciliaris; Capim buffel; Goats; Sheep; Animal performance; Parturition; Mortality; Pasture feeding; Pastures; Buffel grass (Cenchrus); Native species. |
| Ano: 1987 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/514183 |
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| Pouvreau, Stephane; Bacher, Cedric; Heral, Maurice. |
| A model of bioenergetics of the black pearl oyster (Pinctada margaritifera) was built to simulate growth, reproduction and spawning in suspended culture at field sites in Takapoto lagoon (French Polynesia). This model was based on allometric scaling of physiological functions and scope for growth (SFG) calculations. The input functions were clearance rate (CR, 1 day(-1)), retention efficiency (RE, %) for each kind of particle encountered in suspended matter, pseudofaeces and faeces productions (PF and F, mg C day(-1)), excretion and respiration rate (U and R, mg C day(-1)). The assimilated carbon (i.e., SFG, mg C day(-1)) was partitioned to the three internal state variables (somatic tissue, shell and gonad) according to the asymptotic increase of the... |
| Tipo: Text |
Palavras-chave: Pearl farming; Food depletion; Scope for growth; Carrying capacity; Suspension feeding; Tropical lagoon. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-380.pdf |
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| Trung Cong, Luong; Lemonnier, Hugues; Hochard, Sebastien; Royer, Florence; Letourneur, Yves. |
| This study was conducted to compare the effects of shrimp and rabbitfish in mono- and polyculture stocked at high biomass on production and environmental conditions in a mesocosm system. Shrimp (14 g) and/or rabbitfish (19 g) were stocked in four treatments with different density but with the same total biomass (236 g m−2), including shrimp monoculture (SM) (17 shrimp m−2), shrimp–fish polyculture (SF) (11 shrimp and 4 rabbitfish m−2), fish–shrimp polyculture (FS) (6 shrimp and 8 rabbitfish m−2) and fish monoculture (FM) (12 rabbitfish m−2). After 10 weeks of experiment, shrimp survival and biomass were low in the treatments where shrimp were dominant (SM, SF), while rabbitfish survival and biomass were high in all the treatments. Shrimp mortality was... |
| Tipo: Text |
Palavras-chave: Polyculture; Penaeidae; Siganidae; Integrated production; Carrying capacity; Pond ecology. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00355/46606/46468.pdf |
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| Heral, Maurice. |
| Growth of molluscs raised in coastal zones, where the water exchange rate is low, appears to be limited, once a certain biomass level is attained, by the availability of food, making it necessary to determine as accurately as possible the trophic capacity of an ecosystem. This paper analyses the various sources of food for molluscs. It would appear that dissolved organic substances play a major role, providing up to half the energy necessary for their metabolism. Particulate material is filtered by molluscs in proportion to their size, with optimum filtration rates varying with species. The negative effect on meat production of high mineraI seston rates is demonstrated, and an analysis provided of the respective role of each component of organic matter.... |
| Tipo: Text |
Palavras-chave: Evaluation; Carrying capacity; Molluscs; Ecosystems; Cochyliculture; Ecosytemes; Molluscs; Evaluation; Capacité biotique. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-2945.pdf |
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| Souchu, Philippe; Vaquer A, André; Collos, Yves; Landrein, Sonia; Deslous-paoli, Jean-marc; Bibent, Bertrand. |
| Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges, The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time, In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by... |
| Tipo: Text |
Palavras-chave: Thau lagoon; Carrying capacity; Nutrient cycling; Phytoplankton; Suspension feeding bivalves. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-808.pdf |
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| Buestel, Dominique; Pouvreau, Stephane. |
| Results of research concerning the food of the pearl oyster Pinctada mai margaritifera are presented, by taking Takapoto atoll (Tuamotu archipelago, French Polynesia) as a study site. Monthly sampling of several parameters representative of bivalve environment and food (water temperature, salinity, mineral and organic matter, proteins, lipids and carbohydrates, chlorophyll a and phaeopigments) confirm and increase knowledge of the Takapoto lagoon hydrobiology. The variability of these parameters was analysed. Takapoto lagoon showed a remarkable spatial stability. Temporal variations showed a low seasonal trend. Local meteorology (wind, precipitation) had an influence on short-term variability (especially for mineral matter). Night and day rhythm also... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Matière en suspension; Capacité trophique; Huı̂tre perlière; Atoll; Pinctada margaritifera; Suspended matter; Carrying capacity; Pearl oyster; Atoll. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00000/10529/7078.pdf |
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| Goulletquer, Philippe; Joly, Jean-pierre; Gerard, Andre; Le Gagneur, Eric; Moriceau, Jacques; Peignon, Jean-marie; Heurtebise, Serge; Phelipot, Pascal. |
| Triploid oysters Crassllstrea gigas were: produced in 1990 by treating fertilized eggs with cytochalasin B (CS). Triploids, treated diploids, and controls were deployed early 1991 in a high carrying capacity ecosystem on the Eastern Coast of Normandy (France). A monthly monitoring in 1992 showed that triploids yielded significantly higher growth rate and biochemical composition. However, growth was more heterogeneous. No evidence was found for a length or weight bimodal frequency distribution within triploid groups after a 26 months rearing cycle. Triploids showed retardation of gametogenesis. Carbohydrates content in triploids remained almost constant (40%) from June to September. Their survival rates were significantly lower than controls. Moreover... |
| Tipo: Text |
Palavras-chave: Biochemical compostion; Survival; Carrying capacity; Triploid; Growth; Oysters; Crassostrea gigas; Composition biochimique; Survie; Capacité trophque; Triploïdes; Croissance; Huîtres; Crassostrea gigas. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/1996/publication-3088.pdf |
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| MOOJEN, E.L.; RESTLE, J.; LUPATINI, G.C.; MORAES, A.G. de. |
| O experimento foi conduzido em area da Universidade Federal de Santa Maria, RS, com o objetivo de verificar os efeitos de tres niveis de adubacao nitrogenada (0, 150 e 300 kg/ha de N) em pastagem de milheto (Pennisetum americanum (L.) Leeke) cv. Comum, sobre a producao animal. Foram utilizados novilhos de corte e avaliados o desempenho por animal, o numero de animais dia/ha e o ganho de peso vivo por area. O sistema de pastejo adotado foi o continuo, com ajustes de carga para manter uma pressao de pastejo de 10%, caracterizando um residuo medio de 3.168 kg de materia seca/ha. As variaveis dependentes mostraram relacao linear positiva com os niveis de adubacao nitrogenada, o que denota o alto potencial do milheto. |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Adubacao nitrogenada; Carga animal; Desempenho por animal; Novilhos; Produtividade animal; Ureia; Nitrogen fertilization; Carrying capacity; Animal performance; Beef steers; Animal productivity; Urea. |
| Ano: 1999 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/101092 |
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| Buestel, Dominique; Pouvreau, Stephane; Tiapari, Jerome; Bougrier, Serge; Chabirand, Jean-michel; Geairon, Philippe; Fougerouse, A. |
| A study of pearl oysters Pinctada margaritifera growth and mortality was done on a monthly basis between June 1990 and September 1991 in Takapoto atoll (Tuamotu archipelago). Meanwhile, sampling parameters representative of bivalves food showed a remarquable spatial stability whithin the lagoon. The amplitude of temporal variability varied in the order of some days. Carrying capacity appears low : energetic content of particulate material in waters is about 2 joules/liter, ten times lower than in temperate areas. On the opposite, seasonal effect is reduced and particulate food is always available. Oysters rearing conditions were appropriate during the studied period with a low mortality rate and a regular growth in size (from 97 mm to 136 mm). Pearls... |
| Tipo: Text |
Palavras-chave: Atoll; Pearl oyster; Carrying capacity; Growth; Pinctada margaritifera; Atoll; Huître perlière; Capacité Trophique; Croissance; Pinctada margaritifera. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/1995/rapport-1642.pdf |
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| Caroppo, Carmela; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Taranto (Italy); carmela.caroppo@iamc.cnr.it; Giordano, Laura; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Naples (Italy); laura.giordano@iamc.cnr.it; Palmieri, Nadia; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Naples (Italy);; Bellio, Giovanna; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Taranto (Italy); giovannabellio@libero.it; Bisci, Antonio Paride; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Taranto (Italy); paride.bisci@iamc.cnr.it; Portacci, Giuseppe; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Taranto (Italy);; Sclafani, Patricia; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Naples (Italy); patricia.sclafani@iamc.cnr.it; Hopkins, Tom Sawyer; National Research Council - Institute for Coastal Marine Environment (CNR - IAMC), Naples (Italy);. |
| Mar Piccolo of Taranto is an estuarine basin heavily exploited for commercial mussel (Mytilus galloprovincialis L.) farming. The historical renown of the Taranto mussels has suffered over the last decade following policy decisions to expand the mussel farms and to relocate a portion of the urban sewage to an outfall outside of Mar Piccolo. The resulting decline in mussel quality and the quandary of how to restore stability to Taranto mussel production became the focal issue for our application of the systems approach framework (SAF). We simulated the ecological, economic, and social interactions that affect mussel production. Stakeholders and mussel farmers contributed by participating in meetings during the entire exercise. Our simulation analysis... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Aquaculture; Bioeconomical modeling; Carrying capacity; Estuarine ecosystem simulation; Mar Piccolo; Stakeholder involvement; Sustainability. |
| Ano: 2012 |
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| Registros recuperados: 24 | |
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