Seasonal variation and drivers of zooplankton, macroinvertebrate and littoral fish communities from irrigation ponds in a semi-arid region in the Eastern Cape (South Africa)

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
L. Mofu, T. Dalu, R. Wasserman, D. Woodford, D. Khosa, O. Weyl
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引用次数: 4

Abstract

Irrigation ponds are increasingly abundant globally, particularly in water-stressed countries with limited natural surface waters, yet knowledge of their ecology is limited. Here, we assessed zooplankton, macroinvertebrate, and littoral fish communities from irrigation ponds located in the Sundays River Valley in South Africa. This study assessed the seasonal community patterns in response to physico-chemical and biotic components. Water temperature, water depth, Secchi depth, and ammonium concentrations differed significantly across seasons. Similarly, Chlorophyll-a concentrations differed seasonally, with water transparency identified as the main driver. Zooplankton was dominated by Rotifera, Copepoda and Cladocera. Seasonal changes in temperature and subsequent fluctuations in water levels resulted in changes in zooplankton community. Macroinvertebrates were dominated by insects, notably the families Corixidae and Naucoridae. The littoral fish community comprised of Glossogobius callidus, Oreochromis mossambicus and Gambusia affinis. Zooplankton, macroinvertebrates and littoral fish abundances, species richness, diversity and assemblage composition differed significantly across seasons with temperature identified as the main driver of these differences. This study demonstrates that bottom-up processes are the dominant drivers of the irrigation pond communities in the Sundays River Valley and highlights the relevance of seasonal abiotic drivers in structuring these communities, particularly G. callidus and G. affinis.
东开普省半干旱区灌溉池塘浮游动物、大型无脊椎动物和沿岸鱼类群落的季节变化及其驱动因素
灌溉池塘在全球范围内日益丰富,特别是在自然地表水有限的缺水国家,但对其生态学的了解有限。在这里,我们评估了来自南非星期日河谷灌溉池塘的浮游动物、大型无脊椎动物和沿岸鱼类群落。本研究评估了季节性群落格局对物理化学和生物成分的响应。水温、水深、Secchi深度和铵态氮浓度在季节间差异显著。同样,叶绿素-a浓度也存在季节差异,水体透明度被认为是主要驱动因素。浮游动物以轮形目、桡足目和枝角目为主。温度的季节性变化和随后的水位波动导致浮游动物群落的变化。大型无脊椎动物以昆虫为主,以棘科和棘科居多。沿海鱼类群落主要有舌鱼(Glossogobius callidus)、莫桑鱼(Oreochromis mossambicus)和附属鱼(Gambusia affinis)。浮游动物、大型无脊椎动物和沿岸鱼类的丰度、物种丰富度、多样性和组合组成在季节之间存在显著差异,温度是造成这些差异的主要原因。本研究表明,自底向上的过程是星期天河谷灌溉池塘群落的主要驱动因素,并强调了季节性非生物驱动因素在构建这些群落中的相关性,特别是G. callidus和G. affinis。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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