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首页> 外文期刊>Marine ecology progress series >Effects of seasonal hypoxia on macrobenthic production and function in the Rappahannock River, Virginia, USA
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Effects of seasonal hypoxia on macrobenthic production and function in the Rappahannock River, Virginia, USA

机译：季节性缺氧对美国弗吉尼亚州拉帕汉诺克河大型底栖动物生产和功能的影响

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Since colonial times, anthropogenic effects have eroded Chesapeake Bay's health, resulting in an increase in the extent and severity of hypoxia (≤2 mg O_2 l~(-1)), adversely affecting community structure and secondary production of macrobenthos in the Bay and its tributaries. The influence of hypoxia on macrobenthic communities is well documented, but less well known is the regulatory effect of hypoxia on macrobenthic production. Changes in macrobenthic production were assessed in the lower Rappahannock River, a sub-estuary of Chesapeake Bay, in an area known to experience seasonal hypoxia. During the spring, summer, fall, and following spring of 2007 and 2008, 10 samples were collected each season for a total of 80 samples, and macrobenthic production was estimated using Edgar's allometric equation. Additionally, from early spring to late fall, dissolved oxygen concentrations were measured continuously at 2 of the 10 sites in 2007, and 2 of the 10 sites in 2008; in conjunction, the macrobenthic community was assessed through bi-weekly grab samples at these sites. Hypoxic sites had as much as 85 % lower macrobenthic production compared to normoxic sites, and macrobenthic production at hypoxic sites was associated with primarily smaller, disturbance-related annelids. Macrobenthic production differed across seasons, and estimated sediment reworking rates were significantly higher during normoxia, indicating that the functional role of the macrobenthic community changed during hypoxia.
机译：自殖民时代以来，人为影响侵蚀了切萨皮克湾的健康，导致缺氧的程度和严重性增加（≤2mg O_2 l〜（-1）），对海湾及其附近大型底栖动物的群落结构和次级生产产生不利影响支流。缺氧对大型底栖动物群落的影响已有大量文献记载，但缺氧对大型底栖动物生产的调节作用知之甚少。在切萨皮克湾次河口的拉帕汉诺克河下游，评估了大型底栖动物生产的变化，该地区经历了季节性缺氧。在2007年和2008年春季，夏季，秋季和春季之后，每个季节收集了10个样品，总共80个样品，并使用Edgar的异速方程估算了大型底栖动物的产量。此外，从早春到深秋，2007年连续测量了10个站点中的2个站点和2008年的10个站点中的2个站点的溶解氧浓度。同时，通过每两周在这些地点采集样本来评估大型底栖动物群落。与正常氧位点相比，低氧位点的大底栖动物生产量降低了多达85％，而在低氧位点的大底栖动物生产主要与较小的，与骚扰相关的花粉症有关。大型底栖动物的生产随季节而变化，并且在常氧期间估计的底泥返工率显着更高，这表明大型底栖动物群落的功能作用在缺氧期间发生了变化。

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