Turnover and vertical transport of zinc by the euphausiid Meganyctiphanes norvegica in the Ligurian Sea

摘要: Participatory turnover time is defined as the required to cycle an element in a system through given material that system. The participatory of ionic zinc by adult Meganyctiphanes norvegica population Ligurian Sea ranged between 498 and 1243 years, depending upon available food supply, considering chain only route for accumulation population. A total-impact was calculated sum live individuals plus dead euphausiids lose 90% their water. Carcasses lost water slower than either feces or molts, so established maximum loss all particulate excretion products; nevertheless, did not differ significantly from time. net vertical transport M. sea surface any specified depth can be dissolved excreted below concentrations left feces, carcasses after they have sunk depth. sink fastest smallest fraction concentration during descent; fecal pellets slowest greatest concentration, molts are intermediate. Nevertheless, represents major delivering bottom (2500 m), because much higher molts. Excretion into at migration living daylight hours also inconsequential. Feces represented over 80% total transported floor if marginal supplies were euphausiids, sufficient supply. effect about 98% its body 500 m daily, conditions supply assuming no released products eaten descent. If considered throughout year, still daily 36% 6% will reach 2500 daily.