Distribution of the Amphipod Diporeia in Lake Superior: The Ring of Fire
Distribution of the Amphipod Diporeia in Lake Superior: The Ring of Fire
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DOI：
10.1016/j.jglr.2012.12.020
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发表时间：
2013-03-01
影响因子：
2.2
通讯作者：
Auer, Tom
中科院分区：
文献类型：
--
作者：
Auer, Martin T.;Auer, Nancy A.;Auer, Tom
从前在五大湖中占主导地位的底栖大型无脊椎动物，现在仍然是苏必利尔湖的一个重要物种。然而，对小尺度片足类动物的分布知之甚少，特别是受能源生产、运输和转化的影响。在这里，我们记录了沿湖泊周边19条横断面的Diporeia的分布和丰富程度。在所有样带均观察到密度升高的区域，平均958 +/- 408双坡蝇/m(2)（平均S.D.），特别是在坡栖区（深度为30-125 m）。这些地区的滨岸水域（陆架生境，125 m）的密度显著较低，平均分别为239 +/- 178/m(2)和106 +/- 59/m(2)。片脚类动物在密度较高的地区，这里被称为火环，占整个湖的三分之二的人口，而只占据四分之一的底栖动物栖息地。火环的湖宽平均为14.2 +/- 9.4 km，其特征是一个过渡性沉积物沉积区，坡度较缓，接近近岸高产区。在火山带内，在中南部地区发现了异常高的密度，在那里，基威诺洋流和斜坡水深测量有助于从邻近的高产地区汇集产量。本研究利用173个站点的密度测量数据，估算了全湖双孔藻常备存量（22.5-37.7万亿个体，4.4-7.4 g干重，2.1-3.5 Gg C）、个体和生物量密度(274-460/m(2)、0.05-0.09 gDW/m（2)、0.03-0.04 gC/m(2)）、面积（0.02-0.03 gC/m(2) /年）和总产量（1.6-2.6 Gg C/年）。(c) 2013年国际大湖研究协会。Elsevier B.V.版权所有。
Diporeia, formerly the dominant benthic macroinveitebrate in the Great Lakes, remains a keystone species in Lake Superior. Little is known, however, about fine scale amphipod distributions, especially as influenced by the production, transport and transformation of energy resources. Here, we document the distribution and abundance of Diporeia along 19 transects around the lake's perimeter. Regions of elevated density, averaging 958 +/- 408 Diporeia/m(2) (mean S.D.) were observed along all transects, typically within slope habitat (depth of 30-125 m). Waters shoreward (shelf habitat, 125 m) of these regions supported significantly lower densities, averaging 239 +/- 178/m(2) and 106 +/- 59/m(2), respectively. Amphipods within regions of elevated density, termed here the Ring of Fire, account for two-thirds of the lakewide population while occupying only one-quarter of the benthic habitat. The Ring of Fire, observed lakewide as a band averaging 14.2 +/- 9.4 km in width, is characterized as a region of transitional sediment deposition with gentle slope, proximate to nearshore locations of elevated primary production. Within the Ring of Fire exceptionally high densities are found in the south central region, where the Keweenaw Current and slope bathymetries serve to funnel production from adjoining regions of high production. Density measurements for the 173 stations sampled here are used to estimate lakewide Diporeia standing stock (22.5-37.7 trillion individuals, 4.4-7.4 Gg dry weight, 2.1-3.5 Gg C), individual and biomass density (274-460/m(2), 0.05-0.09 gDW/m(2), 0.03-0.04 gC/m(2)) and areal (0.02-0.03 g C/m(2)/yr) and total (1.6-2.6 Gg C/yr) production. (c) 2013 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.