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The life cycle, population dynamics and production of Cyathura carinata (a keystone species in the Mondego estuary, Portugal) is described from an intertidal mudflat along a spatial gradient of eutrophication. New information is presented conceming the role of macroalgal blooms in the biology, dynamics and production of the estuarine isopod C. carinata. A previous hypothesis that large and extensive macroalgal blooms could bring about the disappearance of this species from the intertidal area was not supported. Moreover; it seemed that large biomasses of the macroalgal Enteromorpha sp. could favour the population in the Mondego estuary. Just one annual cohort was produced in June, in opposition to previous studies. Our results suggest that C. carinata is an annual species in the Mondego estuary, with univoltine life cycle. Growth production (P) of C. carinata during the algal bloom was 10.543 g.m 4 month-, and 19.623 g.m year l , and without macroalgae 7.718 g.m4 month-, and I 1.795 g.myear-I. PiB and EIS ratios were always lower during the macroalgae blooms, which is consistent with the idea that the energy flow is smaller in these periods because the standing stock is much higher. Moreover; this paper reveals that conclusions based on just one annual cycle can be incorrect Longer sampling programs are needed to have a better understanding of the real dynamics of macrobenthic species in very dynamic systems.

Life cycle, biology and production of an estuarine isopod (Cyathura carinata)