An ostracod-based record of paleoecological conditions during MIS6 and MIS5, from Lake Chalco, Basin of Mexico
An ostracod-based record of paleoecological conditions during MIS6 and MIS5, from Lake Chalco, Basin of Mexico
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墨西哥盆地查尔科湖 MIS6 和 MIS5 期间基于介形类的古生态条件记录
DOI：
10.1007/s10933-022-00237-w
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发表时间：
2022
影响因子：
2.1
通讯作者：
Brown, E. T.
中科院分区：
文献类型：
--
作者：
Chávez-Lara, C. M.;Lozano-García, S.;Ortega-Guerrero, B.;Caballero-Miranda, M.;Avendaño, D.;Brown, E. T.
墨西哥盆地Chalco湖沉积物记录显示，在海洋同位素阶段（MIS）6（146-130 ka）和MIS 5（130-72 ka）的后期，存在两种特有介形类，即Candona alchichica和Limnocytherina axalapasco。在MIS 6期间发现了alchichica，当时主要条件是寒冷的，湖水沃茨是新鲜的，相对较深的底部沃茨是缺氧的。该物种通常与今天的盐水环境有关，与MIS 5沉积物中的存在一致。然而，中铝的记录显示，它与淡水硅藻物种在MIS 6共存。因此，我们建议C. alchichica具有更广泛的耐盐性，从淡水到更含盐的环境。MIS 5亚阶段的检查提供了进一步的见解介形虫物种对不断变化的湖泊条件的反应。在MIS 5e期间，湖水水位下降，水柱中的盐度和溶解氧增加，从而有利于L。axalapascoproductivity，其中C.产碱能力下降。MIS 5d期间径流量增加和蒸发量低于平均值与C丰度增加相一致。alchichica，这表明一个时期的相对较高的湖泊水位和更稀释的沃茨。然而，这些环境条件在MIS 5c期间发生了变化，湖泊水位再次下降，L. axalapasco丰度增加。在此阶段，浅的条件是最佳的L。axalapasco。随后，随着MIS 5 b期间湖平面持续下降，这两种介形虫物种从沉积物记录中消失。最后，在MIS 5a期间，径流量增加，两种介形虫物种都重新出现在记录中，其中L. axalapascocordinating，这表明另一个时期的湖平面恢复。在这一阶段的最后一部分（75-72卡尔ka BP）的蒸发率增加可能导致介形虫从沉积物记录中消失。总体而言，在MIS 5期间，我们检测到更高的L。axalapasco，代表相对较浅的湖泊条件。
A sediment record from Lake Chalco, Basin of Mexico, revealed the presence of two endemic ostracod species during the latter part of Marine Isotope Stages (MIS) 6 (146–130 ka) and MIS5 (130–72 ka), namelyCandona alchichicaandLimnocytherina axalapasco.Higher abundance ofC. alchichicawas found during MIS6, when prevailing conditions were cold, lake waters were fresh, and relatively deep bottom waters were anoxic. The species is typically associated with saline environments today, consistent with its presence in MIS5 sediments. The Chalco record, however, reveals that it coexisted with freshwater diatom species during MIS6. Thus, we suggest thatC. alchichicahad a wider salinity tolerance, ranging from freshwater to more saline environments. Examination of MIS5 substages provides further insights into ostracod species responses to changing lake conditions. During MIS5e, the lake water level declined and salinity and dissolved oxygen in the water column increased, thereby favouringL. axalapascoproductivity, whereasC. alchichicaproductivity decreased. Enhanced runoff and lower than average evaporation during MIS5d coincided with the increasing abundance ofC. alchichica, suggesting a period of relatively high lake level and more dilute waters. These environmental conditions, however, changed during MIS5c when lake stage dropped once again andL. axalapascoabundance increased. Shallow conditions during this substage were optimal forL. axalapasco. Subsequently, as the lake level continued to decline during MIS5b, both ostracod species disappeared from the sediment record. Finally, during MIS5a, runoff increased and both ostracod species reappeared in the record, withL. axalapascodominating, suggesting another period of lake level recovery. Increased evaporation rates during the last part of this substage (75–72 cal ka BP) may have led to disappearance of ostracods from the sediment record. Overall, during MIS5, we detected higherL. axalapasco, which represent relatively shallow lake conditions.
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