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Impacts of exposure to mine tailings on zooplankton hatching from a resting egg bank
Aquatic Ecology ( IF 1.8 ) Pub Date : 2021-03-17 , DOI: 10.1007/s10452-021-09844-7
Gleice de Souza Santos , Edissa Emi Cortez Silva , Florinda Moreira Balmant , Paula Cristine Silva Gomes , Eneida M. Eskinazi-Sant’Anna

In the last five years, two colossal environmental disasters involving iron-enriched mine tailings have occurred in Brazil, affecting many aquatic ecosystems over the short, medium and long-terms. This study investigated whether these iron-enriched mine tailings affect the main biotic strategy to restore zooplankton populations affected by severe stress, i.e., hatching of dormant stages. A 30 day hatching experiment was conducted, using a resting egg bank from a natural lake, exposed to 3 concentrations of mine tailings: control (0 g), T25 (25 g) and T50 (50 g). A total of 22, 15 and 16 species hatched in the control, T25 and T50, respectively. Conochilus sp., Filinia terminalis, Hexartha mira, Bosmina longirostris and Ceriodaphnia silvestrii hatched only in the control, which suggests that these species are sensitive to any concentration of mine tailings. A gradual decrease in richness and hatchling abundance was recorded, from the control (8.0 ± 1.0 SE species and 1597 ± 73.9 hatchlings) to T25 (4.6 ± 1.2 species and 1279 ± 136.5 hatchlings) and then to T50 (2.3 ± 1.2 species and 603.3 ± 61.9 hatchlings). Our results suggest that exposure of zooplankton resting eggs to iron-enriched mine tailings may negatively impact these egg banks in natural ecosystems, with potential impacts on the restoration of zooplankton communities after even short-term exposures.

Graphic abstract



中文翻译:

暴露于矿山尾矿对静止的卵库中浮游动物孵化的影响

在过去的五年中,巴西发生了两次涉及富铁矿山尾矿的巨大环境灾难,在短期,中期和长期内影响了许多水生生态系统。这项研究调查了这些富含铁的矿山尾矿是否影响恢复受严重压力(即休眠阶段的孵化)影响的浮游动物种群的主要生物战略。使用来自天然湖的静止卵库进行了30天的孵化实验,该卵库暴露于3种浓度的矿山尾矿中:对照(0 g),T25(25 g)和T50(50 g)。对照中分别孵化出22、15和16种,T25和T50。Conochilus sp。,Filinia terminalis,Hexartha miiraBosmina longirostrisCeriodaphnia silvestrii仅在对照中孵化,这表明这些物种对任何浓度的矿山尾矿都敏感。从控制量(8.0±1.0 SE种和1597±73.9种孵化)到T25(4.6±1.2种和1279±136.5种孵化),然后到T50(2.3±1.2种和603.3种),记录到的丰富度和孵化量逐渐减少。幼体±61.9)。我们的结果表明,浮游动物静止卵暴露于富含铁的矿山尾矿可能会对自然生态系统中的这些卵库产生负面影响,即使是短期接触,也可能对浮游动物群落的恢复产生潜在影响。

图形摘要

更新日期:2021-03-17
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