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首页> 外文期刊>Fauna Norvegica >A comparison of results from previous and present investigations of benthic macroinvertebrates in the small and shallow Lake Shoji, Fuji Five Lakes, Japan
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A comparison of results from previous and present investigations of benthic macroinvertebrates in the small and shallow Lake Shoji, Fuji Five Lakes, Japan

机译：日本富士五湖浅浅浅水浅滩底栖大型无脊椎动物调查结果的比较

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In order to clarify the current status of the benthic community of Lake Shoji, and to examine the difference with the last quantitative data of the lake by Miyadi (1932) and Kitagawa (1973), the distribution of benthic macroinvertebrates in this lake was studied. Also, a comparison of the benthic fauna and density was made between the present and previous studies, with a discussion concerning the succession of benthic macroinvertebrates in relation to changes in the lake bottom environment. On March 1, 2010, and September 7, 2011, bathymetrical sampling surveys were carried out using a standard Ekman-Birge grab at each of the 7 locations in Lake Shoji. The average densities of the benthic communities for all the stations were 4,107 inds. m-2, comprised principally of oligochaetes 50.2%, chironomids 48.6%, and chaoborid 1.2% in March 2010, whereas in September 2011 the average density was 1,185 inds. m-2, and mostly comprised of oligochaetes 86.6% and chironomids 13.4%. On the other hand, the average biomasses (wet weight) of these benthic macroinvertebrates in March 2010 were composed of 33.3% oligochaetes, 62.8% chironomid larvae, and 3.9% chaoborid larvae, as opposed to 48.8% oligochaetes and 51.2% chironomid larvae, respectively, in September 2011. Propsilocerus akamusi (Tokunaga, 1938) and Procladius sp. of chironomid larvae were the dominant species, making up 10.0% and 17.6%, respectively, of the total chironomid fauna in density, and 83.2% and 9.2% in biomass in March 2010. The mean density of P. akamusi was about 2.5 times higher than that reported by Kitagawa in the 1970s. In recent years, the number of P. akamusi larvae has tended to increase; they are widely distributed, and the anoxic-layer and anaerobic-layer are thickening, especially during summer to late fall in Lake Shoji, suggesting that the lake is in the process of eutrophication. doi: 10.5324/fn.v31i0.1365. Published online: 17 October 2012
机译：为了弄清尚治湖底栖动物群落的现状，并与Miyadi（1932）和Kitagawa（1973）与该湖的最新定量数据进行检验，研究了该湖底栖无脊椎动物的分布。此外，在目前和以前的研究之间对底栖动物的种类和密度进行了比较，并讨论了底栖大型无脊椎动物与湖底环境变化有关的演替。在2010年3月1日和2011年9月7日，在Shoji湖的7个地点中的每个地点使用标准的Ekman-Birge抓斗进行了测深采样调查。所有站点的底栖生物群落平均密度为4,107 inds。在2010年3月，m-2主要由低毛类50.2％，手足类48.6％和潮汕类1.2％组成，而2011年9月的平均密度为1,185个印度。 m-2，且主要由寡壳类动物组成，占86.6％，手足类动物占13.4％。另一方面，2010年3月，这些底栖大型无脊椎动物的平均生物量（湿重）由33.3％的寡壳类，62.8％的鳞毛类幼体和3.9％的潮甲类幼体组成，而分别为48.8％的寡头幼体和51.2％的壳类幼虫，2011年9月。Propsilocerusakamusi（Tokunaga，1938年）和Procladius sp。 ron虫幼虫是主要种类，2010年3月分别占chi虫总动植物的密度的10.0％和17.6％，生物量的分别为83.2％和9.2％。akamusi的平均密度约高2.5倍比北川在1970年代报道的要多。近年来，akamusi幼虫的数量趋于增加。它们分布广泛，缺氧层和厌氧层都在增厚，特别是在夏至湖的夏季至深秋，这表明该湖处于富营养化过程。 doi：10.5324 / fn.v31i0.1365。在线发布：2012年10月17日

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