Spring bloom sedimentation in a subarctic ecosystem

摘要: A 5-yr study (1985 to 1989) of spring bloom sedimentation in Auke Bay, Alaska, indicates that the sinking response diatoms ambient nutrients influences both species succession during and subsequent new production. Diatoms from genera Thalassiosira, Chaetoceros Skeletonema formed bulk each year. Growth Thalassiosira spp. consistently initiated primary bloom, while costatum tended grow later in, or after, bloom. We postulate this successional pattern is driven by interspecific nutrient competition. Overall, flux dominant was correlated with surface concentrations cells integrated over period. In fact, different linear relationships existed when were considered separately, but not for sp., indicating marked differences exist between tendencies these genera. The observed inter-generic are explicable overall rates, as well nutrient-sensitivities rates genus. spp., fastestsinking most nutrient-sensitive species, contributed up 10 x more carbon benthos all years study, reaching a maximum 11.1 gCm-2 single event 1988. This tendency sink and/or after highly dependent on species-specific cell physiology, supports idea it fast-sinking, diatoms, such constitute major source vertical embayment other coastal ecosystems