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| Registros recuperados: 45 | |
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| Fréon, Pierre; Gerlotto, François; Soria, Marc. |
| The study of the internal school structure and behaviour of pelagic fish provides interesting information in relation to acoustic surveys, especially when comparing the undisturbed structure with the structure observed beneath a vessel passing over a school. The methodological approach involves in situ observations and combines acoustic and visual (aerial and underwater) techniques. The internal school structure is heterogeneous, including vacuoles, and this structure changes when the school is overpassed by a vessel during the day. In this case compression of the upper layer of the school is observed. The influence of this school structure on the variability of the density estimation has been studied. For the subsurface schools, the usual rate of sampling... |
| Tipo: Text |
Palavras-chave: POISSON MARIN; ESPECE PELAGIQUE; ETHOLOGIE; PREDATION; PROSPECTION ACOUSTIQUE; BANC; OBSERVATION AERIENNE. |
| Ano: 1992 |
URL: http://www.documentation.ird.fr/hor/fdi:37893 |
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| Pavis, C.; Malosse, C.; Ducrot, P.H.; Descoins, C.. |
| We investigated the exocrine secretions from the five nymphal instars in the southern green stink bug, Nezara viridula, by analyzing separately the contents of the three dorsal abdominal reservoirs. All DAGs 1 produced a mixture of five alkanes with 12, 13, 14, 15, and 16 carbons. No differences were found between DAGs 2 and DAGs 3, for the five instars: the glands of first instars produce the same alkanes as DAGs 1, n-tridecane, traces of (E)-2-decenal, and a specific compound: (E)-4-oxo-2-decenal. In the other instars (second to fifth), (E)-4-oxo-2-decenal is absent from the secretion but another compound is present: (E)-4-oxo-2-hexenal. The kinetics of production of the different compounds were studied, the maximum amounts produced occurring 36 hr after... |
| Tipo: Journal Article |
Palavras-chave: NEZARA VIRIDULA; HETEROPTERA; GLANDE ABDOMINALE; NYMPHE; SOLENOPSIS GEMINATA; PHEROMONE D'AGREGATION; COMPOSITION CHIMIQUE NEZARA VIRIDULA; HETEROPTERA; PENTATOMIDAE; DORSAL ABDOMINAL GLANDS; NYMPHS; (E)-4-OXO-2-DECENAL; AGGREGATION PHEROMONE; REPELLENT; PREDATION. |
| Ano: 1994 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9500002845045751&uri=/notices/prodinra1/2010/11/ |
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| Registros recuperados: 45 | |
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