Comparaison de méthodes d'évaluation de la production secondaire d'une population de l'annélide polychète Ditrupa arietina (O.F. Muller)

摘要: Abstract We compared the ability of three direct methods (increment summation, loss summation and instantaneous growth rate coefficient), size-frequency method, eight indirect (Banse Mosher, Benke, Brey, Edgar, Morin Bourassa, Plante Downing, Robertson Schwinghamer et al.) to measure or predict secondary production a Mediterranean population polychaete Ditrupa arietina. This comparison was carried out both on 1994 cohort during its two-year lifespan entire two years study (1994–1996). Our results showed that all are more less equivalent. Results referring year 1994–1995 strong overestimation actual by size frequency method. is attributed existence an average individual maximal below which equals zero. During same year, obtained using were highly variable, partly, but not solely, due type environment for regression models built. The incorporation temperature as independent variable within most recent did contribute improving quality predictions. 1995–1996 confirm incapacity changes in P/B ratio relation with age structure recruitment irregularities. These discussed context inferring productivities at community level.