Long-term trends in Lake Ontario's benthic macroinvertebrate community from 1994-2008
Long-term trends in Lake Ontario's benthic macroinvertebrate community from 1994-2008
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DOI：
10.1080/14634988.2014.965122
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发表时间：
2015-01-01
影响因子：
0.8
通讯作者：
Rudstam, L. G.
中科院分区：
文献类型：
--
作者：
Birkett, K.;Lozano, S. J.;Rudstam, L. G.
通过2008年的一项全湖调查，对安大略湖的底栖大型无脊椎动物群落进行了评估。2008年，整个湖泊的所有深度都非常罕见，52个地点中只有4个密度> 100 m（-2），所有这些地点都在深度> 90 m。2008年发现的Diporeia的最大密度为257 m2，与1994年观察到的13，280 m2的最大密度相比。全湖Diporeia丰度下降了一个额外的数量级，从2003年的平均342米（-2）到2008年的21米（-2）。斑驴贻贝（D. rostriformis bugensis）在2008年的大型底栖无脊椎动物群落中占主导地位，占70%以上的密度和98%的生物量。在2008年的样本中没有发现斑马贻贝。斑驴贻贝、寡毛类和摇蚊在31 - 90米之间最为丰富。Sphaeriids在所有深度都很罕见，但在90米以上的地方更丰富。在2003年至2008年期间，全湖的Dreissena丰度下降了43%，主要是由于10-30米深度区域（从6500米（-2）到900米（-2））的显着下降。Dreissena在30-90 m或90 m以上深度区域没有显著下降。2008年的调查显示，Diporeia和Sphaeriid蛤继续下降，斑驴贻贝取代了斑马贻贝，斑驴贻贝在30米以下的深度下降。寡毛类和摇蚊类自20世纪90年代以来没有显着变化。
The benthic macroinvertebrate community of Lake Ontario was assessed through a lakewide survey in 2008. Diporeia was very rare throughout the lake at all depths in 2008, and only four of 52 locations had densities > 100 m(-2), all of them at depths > 90 m. The maximum density of Diporeia found at any location was at 257 m-(2) in 2008, which can be compared to maximum densities of 13,280 m(-2) observed in 1994. Lakewide Diporeia abundance declined with an additional order of magnitude from an average of 342 m(-2) in 2003 to 21 m(-2) in 2008. The Quagga Mussel (D. rostriformis bugensis) dominated the benthic macroinvertebrate community in 2008, comprising over 70% of the density and 98% of the biomass. No Zebra Mussels were identified in the 2008 samples. Quagga Mussels, Oligochaetes and Chironomids were most abundant between 31 and 90 m. Sphaeriids were rare at all depths, but were more abundant at sites deeper than 90 m. Between 2003 and 2008, lakewide Dreissena abundance declined by 43% primarily due to significant declines in the 10-30 m depth region (from 6500 m(-2) to 900 m(-2)). Dreissena did not decline significantly in the 30-90 m or over 90 m depth regions. The 2008 survey revealed a continued decline in Diporeia and Sphaeriid Clams, a replacement of Zebra Mussels by Quagga Mussels, and a decline in Quagga Mussels at depths shallower than 30 m. Oligochaetes and chironomids showed no significant changes since the 1990s.