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POPULATION DYNAMICS AND PRODUCTION OF THE AMPHIPOD ORCHESTIA GAMMARELLUS (TALITRIDAE) IN A RIA FORMOSA SALTMARSH (SOUTHERN PORTUGAL) BY NATÁLIA DIAS 1,2 / and MARTIN SPRUNG (†) 3 / 1 / Universidade do Algarve, Faculdade de Ciências do Mar e do Ambiente, Campus de Gambelas, Faro, Portugal ABSTRACT Population dynamics and production of the amphipod, Orchestia gammarellus were studied for two years in a Ria Formosa saltmarsh (southern Portugal). The animals were sampled every 6th week using pitfall traps and core samples. The highest densities were recorded in the organic matter deposits during spring 1999 (core samples) and most intense activity (pitfall traps) during autumn 1998. Females lived for 8-11 months and reached up to 14 mm body length while males lived for 8- 12 months and reached 17 mm body length. Reproduction was continuous and started when females were 6-7 months old. Females produced, on an average, 17 eggs each and fecundity increased with size. Sex ratio was 58% on an annual average. Daily mortality was generally high (0.9%) with higher values in spring/summer (1.8%) and lower in autumn/winter (0.5%). Signi cant differences in the Von Bertalanffy growth curves were found with males growing faster than females. Annual production
Crustaceana – Brill
Published: Jan 1, 2003
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