Environmental gradients determining the distribution of benthic macroinvertebrates in Lake Takkobu, Kushiro wetland, northern Japan
Environmental gradients determining the distribution of benthic macroinvertebrates in Lake Takkobu, Kushiro wetland, northern Japan
复制标题
DOI：
10.1007/s11284-008-0514-0
复制
发表时间：
2009-03
影响因子：
2
通讯作者：
N. Takamura;Tomiko Ito;R. Ueno;A. Ohtaka;I. Wakana;M. Nakagawa;Youichi Ueno;H. Nakajima
中科院分区：
文献类型：
--
作者：
N. Takamura;Tomiko Ito;R. Ueno;A. Ohtaka;I. Wakana;M. Nakagawa;Youichi Ueno;H. Nakajima
2003年夏天，在日本北部钏路湿地塔甲部湖沿岸的25个地点，研究了环境变量对沉积物中大型底栖动物分布的影响。在过去的十年中，该湖的状况经历了巨大的转变，从以沉水植物为主的清水到以浮游植物为主的浑水。典型对应分析表明，四个环境变量解释了大型无脊椎动物物种组成的显着变化：沉水植物生物量、底部沉积物有机质含量（OMC）、距Takkobu河河口的距离和底层pH值。摇蚊科的五种 [Chironomussp.] (除了plumosusgroup)、Psectrocladiussp.、Corynoneurasp.、Parachironomussp.arcuatusgroup和Zavreliellasp.]出现在pH值相对较低和沉水植物生物量较高的地点，而Tubificidae的三种(Tubifex tubeifex、Aulodriluslimnobius和Aulodrilussp.)和两种摇蚊科(Nanocladiussp.)出现在pH相对较低和沉水植物生物量较高的地点。和 Monodiamesasp.) 发生在高 pH 值和很少植被的地方。三种水管科物种也喜欢富含有机物的沉积物。不论水生植物，Sphaeriumsp。 （双壳纲）和单壳纲。 (Chironomidae) 发生在低 OMC 位点，而 Tanypussp. （摇蚊科）首选高 OMC 位点。大型无脊椎动物类群的数量与沉水植物数量的相关性最高，表明大型无脊椎动物物种丰富度主要与该湖沉水植物物种多样性有关。因此，沉水植物和 OMC 的数量和物种丰富度是 Takkobu 湖沉积物中大型无脊椎动物群落结构的重要决定因素。
Effects of environmental variables on the distribution of benthic macroinvertebrates inhabiting sediments were studied at 25 sites along the shoreline of Lake Takkobu in the Kushiro wetland of northern Japan in summer 2003. During the last decade, the lake’s status has undergone a drastic shift from clear water dominated by submerged macrophytes to turbid water dominated by phytoplankton. The canonical correspondence analysis showed that four environmental variables explained the significant variation in the macroinvertebrate species composition: submerged plant biomass, bottom sediment organic matter content (OMC), distance from the mouth of the Takkobu River, and bottom-layer pH. Five species of Chironomidae [Chironomussp. (exceptplumosusgroup),Psectrocladiussp.,Corynoneurasp.,Parachironomussp.arcuatusgroup, andZavreliellasp.] occurred in sites with relatively lower pH and a high submerged plant biomass, whereas three species of Tubificidae (Tubifex tubifex,AulodriluslimnobiusandAulodrilussp.) and two of Chironomidae (Nanocladiussp. andMonodiamesasp.) occurred in sites with high pH and little vegetation. The three Tubificidae species also preferred organic-rich sediments. Irrespective of aquatic vegetation,Sphaeriumsp. (Bivalvia) andMonodiamesasp. (Chironomidae) occurred in low-OMC sites, whereasTanypussp. (Chironomidae) preferred high-OMC sites. The number of macroinvertebrate taxa showed the highest correlation with the number of submerged plants, suggesting that macroinvertebrate species richness was related mostly to submerged plant species diversity in this lake. The quantity and species richness of submerged plants and OMC are thus important determinants of the community structure of macroinvertebrates inhabiting sediments in Lake Takkobu.