Data/hora: 10/06/2024 07:38:02

Provedor de dados: 	5	
País: 	France	
Título: 	Comparaison de méthodes d'évaluation de la production secondaire d'une population de l'annélide polychète Ditrupa arietina (O.F. Muller)	
Autores: 	Medernach, L; Gremare, A.	
Data: 	1999-05	
Ano: 	1999	
Palavras-chave: 	Production secondaire; Méthodes; Polychètes; Méditerranée; Secondary production; Methods; Polychaetes; Mediterranean Sea.	
Resumo: 	We compared the ability of three direct methods (increment summation, loss summation and instantaneous growth rate coefficient), the size-frequency method, and eight indirect methods (Banse and Mosher, Benke, Brey, Edgar, Morin and Bourassa, Plante and Downing, Robertson and Schwinghamer et al.) to measure or to predict the secondary production of a Mediterranean population of the polychaete Ditrupa arietina. This comparison was carried out both on the 1994 cohort during its two-year lifespan and on the entire population during the two years of the study (1994-1996). Our results showed that all three direct methods are more or less equivalent. Results referring to the year 1994-1995 showed a strong overestimation of the actual production by the size frequency method. This is attributed to the existence of an average individual maximal size below which the actual production equals zero. During the same year, the results obtained using indirect methods were highly variable, partly, but not solely, due to the type of environment for which the regression models were built. The incorporation of temperature as an independent variable within the most recent regression models did not contribute to improving the quality of the predictions. Results referring to the year 1995-1996 confirm the incapacity of both the size frequency and the indirect methods to predict changes in the P/B ratio in relation with age structure and recruitment irregularities. These results are discussed in the context of inferring productivities both at the population and the community level.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00325/43614/43916.pdf

DOI:10.1016/S0399-1784(99)80056-5

http://archimer.ifremer.fr/doc/00325/43614/	
Editor: 	Gauthier-villars/editions Elsevier	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 1999-05 , Vol. 22 , N. 3 , P. 337-352	
Fonte: 	Elsevier, Paris / Ifremer / Cnrs / Ird

info:eu-repo/semantics/openAccess

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