首页> 美国卫生研究院文献>Journal of Plankton Research >Mycosporine-like amino acids in planktonic organisms living under different UV exposure conditions in Patagonian lakes
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Mycosporine-like amino acids in planktonic organisms living under different UV exposure conditions in Patagonian lakes

机译:巴塔哥尼亚湖泊中不同紫外线照射条件下生活的浮游生物中的霉菌素样氨基酸

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摘要

Mycosporine-like amino acids (MAAs) were studied in zooplankton from 13 Argentinian lakes covering a broad range in altitude, maximum depth and physico-chemical properties of the water. Four to nine different MAAs (predominantly porphyra-334 and shinorine) were found in the copepods Boeckella gibbosa, B. gracilipes, B. meteoris and Parabroteas sarsi, and in the ciliate Stentor amethystinus, while MAAs were undetectable in the cladoceran Daphnia middendorffiana. Among the different copepods, maximum MAA concentrations accounted for 0.25–1.31% of the dry weight, and contents were generally about three to seven times (up to 43 times) higher in the animals living in the clearest lakes compared to those occurring in low-UV systems. This variability in the content of MAAs was related to the lake altitude (r2 = 0.71), and the fraction of the water column to which 1% of the surface UV radiation at 320 nm penetrated (r2 = 0.57). Our data therefore underscore the role of MAAs as sunscreens to decrease the potential negative effects of solar radiation, but they also indicate that other environmental factors besides UV transparency play a role in determining MAA concentrations. One lake was selected to obtain additional information on the qualitative composition of MAAs in seston of <100 μm between two sampling sites and over a 2 month study period (austral summer). Six different MAAs were detected in the samples, with porphyra-334 and palythine being predominant. In the copepods collected simultaneously, there was low variation in MAA concentrations between the two sites and over time. Thus, our results suggest that under similar UV exposure conditions MAA contents of planktonic organisms show low temporal variation.
机译:在13个阿根廷湖泊的浮游动物中研究了类霉菌素样氨基酸(MAA),涵盖了海拔,最大深度和理化性质的广泛范围。在the足类Boeckella gibbosa,B。gracilipes,B。meteoris和Parabroteas sarsi以及纤毛的Stentor紫水晶中发现了4到9种不同的MAA(主要是卟啉334和shinorine),而在锁骨水蚤Daphnia middendorffiana中未检测到MAA。在不同的pe足类动物中,最大MAA浓度占干重的0.25–1.31%,与生活在低海拔湖泊中的动物相比,生活在最晴朗的湖泊中的动物的MAA含量通常高约三至七倍(最高达43倍)。紫外线系统。 MAAs含量的这种变化与湖泊海拔高度(r 2 = 0.71)和水柱中320%的表面UV辐射能穿透的部分有关(r 2 = 0.71)。 sup> 2 = 0.57)。因此,我们的数据强调了MAA作为防晒剂的作用,可减少太阳辐射的潜在负面影响,但它们还表明,除UV透明性外,其他环境因素在确定MAA浓度中也起作用。选择了一个湖泊,以获取有关两个采样点之间以及为期两个月的研究期(夏季澳大利亚)中小于100μm的活塞中MAA定性组成的其他信息。样品中检测到六种不同的MAA,其中以卟啉334和蛋氨酸为主要成分。在同时收集的the足类动物中,两个部位之间的MAA浓度随时间变化很小。因此,我们的结果表明,在相似的紫外线照射条件下,浮游生物的MAA含量显示出较低的时间变化。

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