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DOI | 10.1016/j.jglr.2017.04.003 |
The deep chlorophyll layer in Lake Ontario: extent, mechanisms of formation, and abiotic predictors | |
Scofield, Anne E.1,2; Watkins, James M.1,2; Weidel, Brian C.3; Luckey, Frederick J.4; Rudstam, Lars G.1,2 | |
发表日期 | 2017-10-01 |
ISSN | 0380-1330 |
卷号 | 43期号:5页码:782-794 |
英文摘要 | Epilimnetic production has declined in Lake Ontario, but increased production in metalimnetic deep chlorophyll layers (DCLs) may compensate for these losses. We investigated the spatial and temporal extent of DCLs, the mechanisms driving DCL formation, and the use of physical variables for predicting the depth and concentration of the deep chlorophyll maximum (DCM) during April-September 2013. A DCL with DCM concentrations 2 to 3 times greater than those in the epilimnion was present when the euphotic depth extended below the epilimnion, which occurred primarily from late June through mid-August. In situ growth was important for DCL formation in June and July, but settling and photoadaptation likely also contributed to the later-season DCL. Supporting evidence includes: phytoplankton biovolume was 2.4x greater in the DCL than in the epilimnion during July, the DCL phytoplankton community of July was different from that of May and the July epilimnion (p = 0.004), and there were concurrences of DCM with maxima in fine particle concentration and dissolved oxygen saturation. Higher nutrient levels in the metalimnion may also be a necessary condition for DCL formation because July metalimnetic concentrations were 1.5 x (nitrate) and 3.5 x (silica) greater than in the epilimnion. Thermal structure variables including epilimnion depth, thermocline depth, and thermocline steepness were useful for predicting DCM depth; the inclusion of euphotic depth only marginally improved these predictions. However, euphotic depth was critical for predicting DCM concentrations. The DCL is a productive and predictable feature of the Lake Ontario ecosystem during the stratified period. (C) 2017 Published by Elsevier B.V. on behalf of International Association for Great Lakes Research. |
英文关键词 | Deep chlorophyll maximum;Oligotrophication;Phytoplankton;Fluorescence |
语种 | 英语 |
WOS记录号 | WOS:000411533900002 |
来源期刊 | JOURNAL OF GREAT LAKES RESEARCH |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/59930 |
作者单位 | 1.Cornell Univ, Dept Nat Resources, Ithaca, NY 14850 USA; 2.Cornell Univ, Cornell Biol Field Stn, Ithaca, NY 14850 USA; 3.US Geol Survey, Great Lakes Sci Ctr, Lake Ontario Biol Stn, 17 Lake St, Oswego, NY 13126 USA; 4.US EPA, Reg 2, New York, NY USA |
推荐引用方式 GB/T 7714 | Scofield, Anne E.,Watkins, James M.,Weidel, Brian C.,et al. The deep chlorophyll layer in Lake Ontario: extent, mechanisms of formation, and abiotic predictors[J]. 美国环保署,2017,43(5):782-794. |
APA | Scofield, Anne E.,Watkins, James M.,Weidel, Brian C.,Luckey, Frederick J.,&Rudstam, Lars G..(2017).The deep chlorophyll layer in Lake Ontario: extent, mechanisms of formation, and abiotic predictors.JOURNAL OF GREAT LAKES RESEARCH,43(5),782-794. |
MLA | Scofield, Anne E.,et al."The deep chlorophyll layer in Lake Ontario: extent, mechanisms of formation, and abiotic predictors".JOURNAL OF GREAT LAKES RESEARCH 43.5(2017):782-794. |
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