4.7 Article

Pesticides drive differential leaf litter decomposition and mosquito colonisation dynamics in lentic conditions

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 839, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156320

关键词

Mosquito larvae; Organophosphate; Pyrethroid; Neonicotinoid; Allochthonous inputs macadamia

资金

  1. University of Venda Niche [UID: FSEA/21/GGES/02]
  2. National Research Foundation [UID: 138206]
  3. NRF Postgraduate Bursary [UID: 121348]
  4. Alexander von Humboldt Foundation
  5. Wissenshaftskolleg zu Berlin Institute for Advanced Study/Stellenbosch Institute

向作者/读者索取更多资源

Global contamination of freshwater ecosystems by chemical compounds, such as pesticides, can exert pressure on organic matter decomposition and reduce primary productivity. In southern Africa, the increasing pesticide usage in macadamia plantations poses a risk to freshwater ecosystems. Common pesticides used in macadamia plantations can influence leaf-litter decomposition, semi-aquatic macroinvertebrate colonization dynamics, and chlorophyll-a concentrations in adjacent freshwater communities.
Global contamination of freshwater ecosystems by chemical compounds, such as pesticides, may exert high pressure on biologically-driven organic matter decomposition. These pollutants may also impair the quality of organic substrates for colonising invertebrates and reduce primary productivity by decreasing the abundance of phytoplankton. In southern Africa, increasing pesticide usage associated with macadamia plantations, in particular, presents a growing risk to freshwater ecosystems. Here, we examined macadamia (Macadamia integrifolia) leaf litter decomposition following exposure to three pesticides (i.e., Karate Zeon 10 CS (lambda-cyhalothrin), Mulan 20 AS (acetamiprid), Pyrinex 250 CS (chlorpyrifos)) used commonly in macadamia plantations, via an ex-situ microcosm approach. We examined mosquito colonisation of these microcosms as semi-aquatic macroinvertebrates which form a significant component of aquatic communities within standing waters. Macadamia leaf litter tended to decompose faster when exposed to Karate and Pyrinex pesticide treatments. Additionally, chlorophyll -a, conductivity, total dissolved solids, and pH differed among pesticide treatments and controls, with pesticides (Karate Zeon and Mulan) tending to reduce chlorophyll -a concentrations. Overall, pesticide treatments promoted mosquito (i.e., Culex spp.) and pupal abundances. In terms of dominant aquatic mosquito group abundances (i.e., Anopheles spp., Culex spp.), the effect of pesticides differed significantly among pesticide types, with Pyrinex and Mulan treatments having higher mosquito abundances in comparison to Karate Zeon and pesticide-free treatments. These findings collectively demonstrate that common pesticides used in the macadamia plantation may exert pressure on adjacent freshwater communities by shaping leaf-litter decomposition, semi-aquatic macroinvertebrate colonisation dynamics, and chlorophyll -a.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据