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The abundance of the calanoid copepod Centropages chierchiae has increased at thenorthern limits of its distribution in recent decades, mainly due to oceanic climateforcing, suggesting this as a key species in monitoring climate change. Laboratoryexperiments were conducted to study the combined effect of temperature, food typeand concentration on the egg production rate (EPR) and hatching success (HS) ofC. chierchiae. Females were fed on two monoalgal diets (Gymnodinium sp. andPhaeodactylum tricornutum) at two food concentrations and at three different tempera-tures (13, 19, 248C). Respiration rates of both genders were measured at four differ-ent temperatures (8, 13, 19, 248C). EPR was signicantly different betweentemperatures and food concentrations, the maximum EPR being attained when thecopepods were exposed to high food levels and at 198C. Prey type signicantly inu-enced EPR; feeding on P. tricornutum resulted in higher egg production thanGymnodinium sp. HS was signicantly lower at 138C than at 19 and 248C and higherwith Gymnodinium sp. Respiration rates were sex independent and increased exponen-tially with temperature. To maintain basal metabolism, the minimum food intake ofP. tricornutum ranged between 0.4 and 1.8 mg C and for Gymnodinium sp. between 0.03and 0.13 mg C. Food intake was always higher than the metabolic demands, exceptfor the highest temperature tested (248C). The present results conrm the sensitivity

Reproduction and respiration of a climate change indicator species: effect of temperature and variable food in the copepod Centropages chierchiae