Photoprotective compounds in zooplankton of two adjacent tropical high mountain lakes with contrasting underwater light climate and fish occurrence
Photoprotective compounds in zooplankton of two adjacent tropical high mountain lakes with contrasting underwater light climate and fish occurrence
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DOI：
10.1093/plankt/fbaa001
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发表时间：
2020-03-01
影响因子：
2.1
通讯作者：
Sommaruga, Ruben
中科院分区：
文献类型：
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作者：
Alcocer, Javier;Delgado, Clara N.;Sommaruga, Ruben
比较了两个相邻(相距600m)的热带高山湖泊El Sol和La露娜浮游动物体内光保护化合物(PC)浓度的时间变化。这些湖泊具有相同的地质成因、时代和流域。然而，它们在水下光线和紫外线穿透以及只在El Sol中发现的Oncorhynchus mykis的存在方面有所不同。而来自清澈的拉露娜的可疑水蚤含有类胡萝卜素和黑色素，而在El Sol中，同一物种缺乏色素。尺足类Leptodiaptomus cuauhtemoci仅在El Sol中发现，并依赖于MAAs和类胡萝卜素的积累。在入射紫外线辐射(UVR)最高的时期，PCS的浓度最高。我们的数据表明，热带浮游动物物种对紫外线辐射的反应是通过积累与暴露在紫外线辐射下太不同的PC来实现的。然而，我们不能排除这样一种可能性，即埃尔索尔湖中鱼类的存在也影响了它们的表型和行为反应。总体而言，浮游动物在PC的类型和浓度方面表现出充分的表型可塑性，以响应低纬度湖泊中普遍存在的高剂量和不同剂量的UVR，类似于高纬度湖泊的浮游动物。
We compared temporal changes in the concentration of photoprotective compounds (PCs) in zooplankton of two adjacent (600 m apart) tropical high mountain lakes, El Sol and La Luna. The lakes have the same geological origin, age and drainage basin. However, they differ in underwater light and UV penetration and in the presence of Oncorhynchus mykiss, only found in El Sol. Whereas Daphnia ambigua from the clear La Luna had carotenoids and melanin, in El Sol, the same species lacked pigmentation. The copepod Leptodiaptomus cuauhtemoci was only found in El Sol and relied on accumulation of MAAs and carotenoids. The maximum concentration of PCs was found over the period with highest incident ultraviolet radiation (UVR). Our data suggest that tropical species of zooplankton respond to UVR by accumulating PCs that are too different in relation to exposure to UVR. However, we cannot discard the possibility that the presence of fish in Lake El Sol influences also their phenotypical and behavioral responses. Overall, zooplankton exhibited an ample phenotypic plasticity in the type and concentrations of PCs in response to the high and variable doses of UVR prevailing in low-latitude lakes, similar to the zooplankton of their high-latitude counterparts.