The outcome of the invasion of Florida lakes by Daphnia lumholtzi
The outcome of the invasion of Florida lakes by Daphnia lumholtzi
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鲁姆霍兹水蚤入侵佛罗里达湖泊的结果
DOI：
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发表时间：
2012
期刊：
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通讯作者：
Teodoro C. Rosati
中科院分区：
文献类型：
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作者：
K. Havens;J. Beaver;T. East;K. Work;E. Phlips;M. Cichra;Amanda C. Croteau;A. J. Rodusky;R. S. Fulton;Teodoro C. Rosati
总结1。我们分析了美国佛罗里达州15个湖泊7-12年的月度和季度历史数据，以确定外来枝洋水蚤（Daphnia lumholtzi Sars）入侵的程度和结果。这种外来物种在15个湖泊中的10个被发现，包括佛罗里达州的三个最大的湖泊：奥基乔比湖、乔治湖和阿波卡湖。所有调查的湖泊都有较小的本地物种水蚤（Daphnia ambigua Scourfield）的常住种群。在大多数湖泊中，双歧藻在浮游生物样本中的出现频率是双歧藻的7 - 9倍，最大密度是双歧藻的10- 100倍。一个例外是佛罗里达州中部的一个小湖泊（Jesup湖），在10年的采样中，d.r umholtzi在几个场合达到了高密度。4. 典型相关分析结果表明，在奥基乔比湖（Lake Okeechobee），由于数据质量和数量都足够进行统计分析，lumholtzi的高密度与较低的悬浮物浓度、较高的藻类生物量和较高的温度相关，而D. ambigua的高密度与相反的条件相关。5. 根据大多数数据，d.r umholtzi已经成功入侵了佛罗里达州的许多湖泊，但它还没有成为浮游动物的实质性组成部分。需要进一步的研究来确定资源、鱼类捕食或其他因素是否导致了这种入侵的结果。
SUMMARY 1. We examined 7–12 years of monthly to quarterly historical data from 15 lakes in FL, U.S.A. to determine the extent and outcome of invasion by the alien cladoceran Daphnia lumholtzi Sars. 2. The alien species was found in 10 of the 15 lakes, including Florida’s three largest lakes: Okeechobee, George and Apopka. All the surveyed lakes had resident populations of the smaller native species Daphnia ambigua Scourfield. 3. In most of the lakes, D. ambigua occurred seven to ninefold more often in plankton samples than D. lumholtzi, and at 10- to 100-fold higher maximal densities. One exception was a small lake in central Florida (Lake Jesup), where D. lumholtzi attained high densities on several occasions in the 10 years of sampling. 4. In Lake Okeechobee, where data were of sufficient quality and quantity to perform statistical analyses, the results of canonical correlation analysis indicated that high densities of D. lumholtzi were correlated with lower concentrations of suspended solids, high algal biomass and higher temperature, whereas the opposite conditions were correlated with high densities of D. ambigua. 5. Based on the majority of data, D. lumholtzi has successfully invaded many lakes in Florida, yet it has not become a substantive component of the zooplankton. Additional research is needed to determine whether resources, fish predation or some other factor is responsible for this outcome of invasion.