在一条城市沙漠河流中使用污水恢复水流后,大型无脊椎动物群落的发展和对河道疏浚的适应能力

IF 2.8 3区 环境科学与生态学 Q2 ECOLOGY
Michael Bogan, Hamdhani Hamdhani, Drew Eppehimer, Kelsey Hollien, Brian Gill
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引用次数: 0

摘要

全球的淡水物种面临着众多威胁,其中包括城市化。在气候较为干燥的地区的城市中,经常会出现河流脱水和河道疏浚的情况,从而减少或消除了淡水生物的多样性。排放污水(经处理的废水)已被用于恢复其中一些河流的流量,但我们对这些独特但日益常见的生态系统中生态群落的发展和变化却知之甚少。在这项研究中,我们对圣克鲁斯河(美国亚利桑那州)的水生大型无脊椎动物群落发展进行了量化,该河流在干涸 100 多年后通过污水恢复了流量。我们对水流得到恢复的河段进行了为期两年的群落发展跟踪研究,并将研究结果与参考河段的数据进行了比较。我们的研究还包括一次大规模的干扰,即暂时停止排放污水,并从河道中疏浚沉积物,这使我们能够量化城市河道维护活动对正在恢复的群落的影响。在最初的水流恢复和河道疏浚之后,大型无脊椎动物的定殖速度很快,其密度和物种丰富度在几个月内就达到或超过了参考河段的水平,但两年后群落组成仍然非常不同。水流持续时间和取样前一个月的干旱天数是影响大型无脊椎动物指标的最大因素。只需向脱水的城市河流中添加污水,就有可能恢复多样化的水生动物,但对于敏感或扩散受限的类群,可能需要有针对性地重新引入。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Macroinvertebrate community development and resilience to channel dredging following flow restoration using effluent in an urban desert river
Freshwater species face numerous threats across the globe, including urbanization. Within cities in regions with drier climates, dewatering and channelization of rivers commonly occur and reduce or eliminate freshwater biodiversity. The discharge of effluent (treated wastewater) has been used to restore flow in some of these rivers, but our knowledge is negligible about how ecological communities develop and change in these unique but increasingly common ecosystems. In this study, we quantified aquatic macroinvertebrate community development in the Santa Cruz River (Arizona, U.S.A.), where effluent‐restored flow more than 100 years after the river dried up. We tracked community development over a 2‐year period in reaches where flow had been restored and compared those findings with data from a reference reach. Our study period also encompassed a massive disturbance where effluent releases temporarily ceased and sediment was dredged from the channel, allowing us to quantify the impacts of urban channel maintenance activities on recovering communities. Macroinvertebrate colonization was rapid following the initial flow restoration and channel dredging, with density and species richness values reaching or exceeding those of the reference reach within a few months, but community composition remained quite distinct after 2 years. Flow duration and the number of dry days in the month prior to sampling were the most influential factors in macroinvertebrate metrics. Simply adding effluent to dewatered urban rivers has the potential to restore diverse aquatic fauna, but targeted reintroductions may be needed for sensitive or dispersal‐limited taxa.
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来源期刊
Restoration Ecology
Restoration Ecology 环境科学-生态学
CiteScore
6.50
自引率
15.60%
发文量
226
审稿时长
12-24 weeks
期刊介绍: Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.
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