The implications of brief floodplain inundation for local and landscape-scale ecosystem function in an intermittent Australian river

IF 1.8 4区 环境科学与生态学 Q2 FISHERIES
Oliver P. Pratt, Leah S. Beesley, Bradley J. Pusey, Samantha A. Setterfield, Michael M. Douglas
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引用次数: 0

Abstract

Context

Floodplain inundation creates a diversity of aquatic habitats that diverge in their physical, chemical and biological characteristics through space and time, influencing site-scale ecological processes, with implications for local and landscape-scale ecosystem functioning.

Aims

In this study, we characterise conditions of pools on the floodplain and pools in the main channel of the Fitzroy River, north-western Australia.

Methods

We used linear models to investigate the spatial and temporal dynamics of top–down and bottom–up forces acting on phytoplankton and zooplankton.

Key results

Floodplain pools showed considerable heterogeneity compared with the main channel and were shallow and turbid with high nutrient loads, whereas main-channel pools were deep, clear and nutrient-limited. Phytoplankton and zooplankton biomass (mass per unit volume) were considerably greater and more variable in floodplain pools than in the main channel, where both were largely absent. On the floodplain, bottom–up processes drove water-column productivity (e.g. nutrients to phytoplankton to zooplankton) to a degree not observed in the main channel, providing a valuable resource pathway supporting consumer populations locally and catchment wide. We detected no top–down effects in floodplain pools and no top–down or bottom–up effects in the main channel.

Conclusion

Maintaining flows that inundate the floodplain and promote habitat heterogeneity in the Fitzroy River is crucial for preserving local and landscape-scale ecosystem functioning.

Implications

Water managers should take into account the important contribution of floodplain pools to the wider riverine ecosystem and ensure these habitats are not unduely affected by water resource development.

澳大利亚一条间歇性河流洪泛区短暂淹没对当地和景观尺度生态系统功能的影响
背景洪泛平原淹没形成了多种多样的水生生境,这些生境的物理、化学和生物特征在空间和时间上各不相同,影响着现场尺度的生态过程,对当地和景观尺度的生态系统功能产生影响。目的 在这项研究中,我们描述了澳大利亚西北部菲茨罗伊河洪泛平原上的水池和主河道中的水池的状况。方法我们使用线性模型来研究自上而下和自下而上作用于浮游植物和浮游动物的空间和时间动态。主要结果与主河道相比,洪泛平原水池表现出相当大的异质性,水池较浅、浑浊、营养负荷高,而主河道水池较深、清澈、营养有限。泛滥平原水池中的浮游植物和浮游动物生物量(单位体积质量)比主河道中的大得多,变化也更大,主河道中基本上没有浮游植物和浮游动物。在冲积平原上,自下而上的过程推动了水柱的生产力(如从营养物质到浮游植物再到浮游动物),其程度是在主河道中无法观察到的,这为支持当地和整个流域的消费种群提供了宝贵的资源途径。我们在洪泛区水池中没有发现自上而下的影响,在主河道中也没有发现自上而下或自下而上的影响。结论在菲茨罗伊河中保持淹没洪泛平原的水流并促进栖息地的异质性对于保护当地和景观尺度的生态系统功能至关重要。影响水管理者应考虑到洪泛平原水池对更广泛的河流生态系统的重要贡献,并确保这些栖息地不会受到水资源开发的不当影响。
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来源期刊
Marine and Freshwater Research
Marine and Freshwater Research 环境科学-海洋学
CiteScore
4.60
自引率
5.60%
发文量
76
审稿时长
3.8 months
期刊介绍: Marine and Freshwater Research is an international and interdisciplinary journal publishing contributions on all aquatic environments. The journal’s content addresses broad conceptual questions and investigations about the ecology and management of aquatic environments. Environments range from groundwaters, wetlands and streams to estuaries, rocky shores, reefs and the open ocean. Subject areas include, but are not limited to: aquatic ecosystem processes, such as nutrient cycling; biology; ecology; biogeochemistry; biogeography and phylogeography; hydrology; limnology; oceanography; toxicology; conservation and management; and ecosystem services. Contributions that are interdisciplinary and of wide interest and consider the social-ecological and institutional issues associated with managing marine and freshwater ecosystems are welcomed. Marine and Freshwater Research is a valuable resource for researchers in industry and academia, resource managers, environmental consultants, students and amateurs who are interested in any aspect of the aquatic sciences. Marine and Freshwater Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
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