Phosphorus recycling by profunda quagga mussels (Dreissena rostriformis bugensis) in Lake Michigan
Phosphorus recycling by profunda quagga mussels (Dreissena rostriformis bugensis) in Lake Michigan
复制标题
密歇根湖深斑驳贻贝 (Dreissena rostriformis bugensis) 的磷回收
DOI：
10.1016/j.jglr.2015.07.007
复制
发表时间：
2015
影响因子：
2.2
通讯作者：
H. Bootsma
中科院分区：
文献类型：
--
作者：
C. Mosley;H. Bootsma
德氏贻贝对五大湖浅水、多产沃茨中浮游生物丰度和营养物质循环的影响已得到充分记载，但它们最近向近海地区扩张的影响却受到较少的关注。了解斑驴贻贝对密歇根湖的磷（P）通量的影响是至关重要的，在评估营养循环和能量流的长期影响。在这项研究中，P排泄和排泄率测定贻贝在密歇根湖的浅水层。恒定的低温和有限的食物供应导致较低的基础P排泄率在深斑鳖贻贝相比，浅的表型。P排泄：排泄比约为3：2，强调需要考虑这两个途径时，评估这些滤食性动物对营养动力学的影响。总溶解性P（TDP）排泄率范围为0.0002 - 0.0124 μmol mgDW− 1d− 1，可溶性反应性P（SRP）排泄率范围为0.0002 - 0.0061 μmol mgDW− 1d− 1，颗粒性P（PP）排泄率（粪便+假粪便）范围为0.0007 - 0.0269 μmol mgDW− 1d− 1。深海贻贝改变P循环动力学的能力反映在增加的hypolimnetic溶解：颗粒P比和底栖霞状层的消失。在面积的基础上，贻贝P的再循环率高达11倍以上的沉积物捕集器所确定的P沉降速率，这表明贻贝放牧导致了增加的输送速率的P的深层底栖生物和较短的P在水柱中的停留时间。
The effects of dreissenid mussels on plankton abundance and nutrient cycling in shallow, productive waters of the Great Lakes have been well-documented, but the effects of their more recent expansion into offshore regions have received much less attention. Understanding quagga mussel impact on Lake Michigan's phosphorus (P) fluxes is critical in assessing long-term implications for nutrient cycling and energy flow. In this study, P excretion and egestion rates were determined for mussels in the hypolimnion of Lake Michigan. Constant low temperatures and limited food supply contributed to a lower basal P excretion rate in profunda quagga mussels compared to the shallow phenotype. The P excretion:egestion ratio was approximately 3:2, highlighting the need to consider both of these pathways when assessing the effect of these filter feeders on nutrient dynamics. Total dissolved P (TDP) excretion rates ranged from 0.0002 to 0.0124 μmol mgDW− 1d− 1, soluble reactive P (SRP) excretion rates ranged from 0.0002 to 0.0061 μmol mgDW− 1d− 1, and particulate P (PP) egestion rates (feces + pseudofeces) ranged from 0.0007 to 0.0269 μmol mgDW− 1d− 1. The ability of profunda mussels to alter P cycling dynamics is reflected in an increased hypolimnetic dissolved:particulate P ratio and the disappearance of the benthic nepheloid layer. On an areal basis, mussel P recycling rates are up to 11 times greater than P settling rates as determined by sediment traps, suggesting that mussel grazing has resulted in an increased delivery rate of P to the deep benthos and a shorter P residence time in the water column.