An energy budget for the subtidal bivalve Modiolus barbatus (Mollusca) at different temperatures

摘要

Clearance rates, respiration rates and food absorption efficiencies of the commercially interesting sub-tidal bivalve Modiolus barbatus were measured at different temperatures under laboratory conditions and scope for growth calculated. Clearance rates were highest at temperatures from 20 ℃ to 28 ℃, whereas respiration rate was maximal at 9 ℃ and minimal at 26 ℃. Highest mean values of absorbed energy occurred at 20 ℃ and 26 ℃. Scope for growth trend had negative values at 9 ℃, 15 ℃ and 28 ℃ and positive values at temperatures 20 ℃ and 26 ℃. The profitable thermal window for M. barbatus to have energy sufficient for growth and reproduction corresponded to <5 months per year. Seawater temperature increases will potentially impact the eco-physiological responses of subtidal M. barbatus causing life history traits to change with important repercussions for subtidal biodiversity in the Mediterranean.