Ecological impacts of an exotic benthivorous fish, the common carp (Cyprinus carpio L.), on water quality, sedimentation, and submerged macrophyte biomass in wetland mesocosms
Ecological impacts of an exotic benthivorous fish, the common carp (Cyprinus carpio L.), on water quality, sedimentation, and submerged macrophyte biomass in wetland mesocosms
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DOI：
10.1007/s10750-015-2220-6
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发表时间：
2015-08-01
期刊：
影响因子：
2.6
通讯作者：
Goldsborough, L. Gordon
中科院分区：
文献类型：
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作者：
Badiou, Pascal H. J.;Goldsborough, L. Gordon
我们研究了鲤鱼（Cyprinus carpio L.）和营养添加物对加拿大马尼托巴省三角洲沼泽中生态系统的水质、沉降率和沉水植物生物量的相互作用。我们想确定鲤鱼和营养物质是否相互作用以增加浮游植物生物量。二乘三重复的因子设计具有以下处理：（1）控制中生态系统，不添加鲤鱼或营养物质； (2)鲤鱼密度低，不添加营养物质； (3)鲤鱼密度高，无营养添加； (4)无鲤鱼及营养物质添加； (5)鲤鱼密度低，营养添加量低； (6)鲤鱼密度高、营养添加量高。正如预期的那样，鲤鱼的存在增加了氨浓度、浊度和浮游植物生物量，但没有增加总活性磷浓度。鲤鱼的存在似乎并没有像其他人所建议的那样与营养添加物产生协同相互作用以增加浮游植物。在鲤鱼密度高且接受营养富集的中生态系统中，相对于仅接受营养富集的中生态系统以及营养富集和低鲤鱼密度的中生态系统，浮游植物似乎受到抑制。总体而言，鲤鱼的存在似乎模仿了富营养化的影响。我们的结果表明，鲤鱼可以在生物量低于600 kg ha(-1) 时导致从清澈的大型植物主导状态转变为浑浊的浮游植物主导状态。
We examined the interactions of the common carp (Cyprinus carpio L.) and nutrient additions on water quality, sedimentation rates, and submerged macrophyte biomass in mesocosms in Delta Marsh, Manitoba, Canada. We wanted to determine if carp and nutrients interacted synergistically to increase phytoplankton biomass. A two-by-three duplicated, factorial design had the following treatments: (1) control mesocosms with no carp or nutrient additions; (2) low carp density and no nutrient additions; (3) high carp density and no nutrient additions; (4) no carp and nutrient additions; (5) low carp density and nutrient additions; and (6) high carp density and nutrient additions. The presence of carp increased ammonia concentrations, turbidity, and phytoplankton biomass as expected but did not increase total reactive phosphorus concentrations. The presence of carp did not appear to interact synergistically with nutrient additions to increase phytoplankton as has been suggested by others. In mesocosms with high carp density and receiving nutrient enrichment, phytoplankton appeared to be suppressed relative to mesocosms receiving nutrient enrichment only, and nutrient enrichment and low carp density. Overall, the presence of carp appears to mimic the effects of eutrophication. Our results demonstrate that carp can cause a shift from a clear, macrophyte-dominated state to a turbid phytoplankton-dominated state at a biomass of less than 600 kg ha(-1).