Evaluating practical macrophyte control tools on small agricultural waterways in Canterbury, New Zealand

Collins, Katie; Febria, Catherine M.; Warburton, Helen J.; Devlin, Hayley S.; Hogsden, Kristy L.; Goeller, Brandon C.; McIntosh, Angus R.; Harding, Jon S.

doi:10.1080/00288330.2018.1487454

Cited by 9 publications

(3 citation statements)

References 35 publications

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“…Whilst unsurprising, this is a non-trivial result because management of shade is often seen as a key element in rehabilitating and restoring degraded streams [65,66]. Shading can reduce proliferations of filamentous green algae and macrophytes that contribute to impaired ecological status [67,68]. For example, excessive autotrophic biomass can increase ecosystem respiration in the water-column and interstitial spaces of the streambed [69,70], potentially leading to adverse impacts on pollution-sensitive EPT (Ephemeroptera, Plecoptera, Trichoptera) species through reductions in dissolved oxygen concentrations [71].…”

Section: Effects Of Shading By Forested Riparian Buffersmentioning

confidence: 99%

Assessing the Benefits of Forested Riparian Zones: A Qualitative Index of Riparian Integrity Is Positively Associated with Ecological Status in European Streams

Burdon

Ramberg

Šargač

et al. 2020

Water

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Developing a general, predictive understanding of ecological systems requires knowing how much structural and functional relationships can cross scales and contexts. Here, we introduce the CROSSLINK project that investigates the role of forested riparian buffers in modified European landscapes by measuring a wide range of ecosystem attributes in stream-riparian networks. CROSSLINK involves replicated field measurements in four case-study basins with varying levels of human development: Norway (Oslo Fjord), Sweden (Lake Mälaren), Belgium (Zwalm River), and Romania (Argeş River). Nested within these case-study basins include multiple, independent stream-site pairs with a forested riparian buffer and unbuffered section located upstream, as well as headwater and downstream sites to show cumulative land-use impacts. CROSSLINK applies existing and bespoke methods to describe habitat conditions, biodiversity, and ecosystem functioning in aquatic and terrestrial habitats. Here, we summarize the approaches used, detail protocols in supplementary materials, and explain how data is applied in an optimization framework to better manage tradeoffs in multifunctional landscapes. We then present results demonstrating the range of riparian conditions present in our case-study basins and how these environmental states influence stream ecological integrity with the commonly used macroinvertebrate Average Score Per Taxon (ASPT) index. We demonstrate that a qualitative index of riparian integrity can be positively associated with stream ecological status. This introduction to the CROSSLINK project shows the potential for our replicated study with its panoply of ecosystem attributes to help guide management decisions regarding the use of forested riparian buffers in human-impacted landscapes. This knowledge is highly relevant in a time of rapid environmental change where freshwater biodiversity is increasingly under pressure from a range of human impacts that include habitat loss, pollution, and climate change.

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Section: Effects Of Shading By Forested Riparian Buffersmentioning

confidence: 99%

Assessing the Benefits of Forested Riparian Zones: A Qualitative Index of Riparian Integrity Is Positively Associated with Ecological Status in European Streams

Burdon

Ramberg

Šargač

et al. 2020

Water

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“…Controlled experiments that compared responses of multiple SAV species to different benthic mats showed varying responses across species as a result of differences in morphology and the plant's ability to pass through the matting material (Hofstra and Clayton 2012). Additionally, studies in stream systems with emergent species have observed high rates of reinfestation after barriers are removed, and colonization on top of barriers when sediment accumulates (Eichler et al 1995;Laitala et al 2012;Collins et al 2019). Benthic barriers can also harm invertebrate communities and interfere with nutrient and oxygen exchange processes where water and sediment meet (Ussery et al 1997).…”

Section: Physical Approachesmentioning

confidence: 99%

Invasive Aquatic Vegetation in the Sacramento–San Joaquin Delta and Suisun Marsh: The History and Science of Control Efforts and Recommendations for the Path Forward

Conrad¹,

Thomas²,

Jetter³

et al. 2023

SFEWS

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Invasive aquatic vegetation (IAV) is a management challenge in the Sacramento–San Joaquin Delta and the Suisun Marsh that has commanded major resource investment for 4 decades. We review the history and supporting science of chemical, biological, and mechanical control of IAV in the Delta and Suisun March, and in flowing waters outside the region. Outside the Delta, there is a significant history of research on IAV control in lotic systems, but few studies come from tidal environments, and we found no investigations at a spatial scale like that of the Delta. The science of control efforts in the Delta is nascent but has seen marked growth over the recent decade. Since 1983, control of invasive submerged and floating species has been centralized within the California State Parks Division of Boating and Waterways (CDBW). The program relies on herbicides, with an annual budget that has exceeded $12.5 million since 2015. However, the results have been mixed because of the challenge of applying herbicides effectively in a tidal system. In parallel, biological control agents for water hyacinth (Eichhornia crassipes) and giant reed (Arundo donax) have been released but have not provided an appreciable control benefit, likely because they are not suited for the temperate Delta climate. Over recent decades, regulatory complexity has increased, hampering efforts to innovate alternative methods or respond quickly to new invaders. Control efforts for giant reed and common reed (Phragmites australis), the main invasive emergent plants, have not been coordinated under a central program, and studies to investigate control strategies have only recently been permitted. As a result, no local studies have been published on control outcomes for these species. Based on this history and our review of the science, we develop recommendations for leadership and science actions to proactively manage IAV.

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“…For narrow floodplain waterbodies, such as streams, drains and side arms, water and habitat quality conditions can be improved through the targeted planting of riparian vegetation on northern banks (e.g., to provide shade, stabilization and organic carbon inputs). Collins et al (2019) assessed shading tolerances of New Zealand native and non-native macrophyte assemblages and highlighted that providing 80% shade over the full channel reduced macrophyte growth from 50% to 17% cover. This level of growth under shaded conditions can provide water conveyance functions without the need for annual drain excavation (where macrophyte growth is the issue of concern), reducing sediment and nutrient mobilization to downstream waterbodies, while native macrophytes are favored at higher shade levels thereby improving biodiversity values of modified or managed watercourses (Ellawala Kankanamge et al, 2019).…”

Section: Enhanced Land Managementmentioning

confidence: 99%

Surviving Invasion: Regaining Native Fish Resilience Following Fish Invasions in a Modified Floodplain Landscape

Pingram

Collier

Williams

et al. 2021

Water Resources Research

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Evaluating practical macrophyte control tools on small agricultural waterways in Canterbury, New Zealand

Cited by 9 publications

References 35 publications

Assessing the Benefits of Forested Riparian Zones: A Qualitative Index of Riparian Integrity Is Positively Associated with Ecological Status in European Streams

Assessing the Benefits of Forested Riparian Zones: A Qualitative Index of Riparian Integrity Is Positively Associated with Ecological Status in European Streams

Invasive Aquatic Vegetation in the Sacramento–San Joaquin Delta and Suisun Marsh: The History and Science of Control Efforts and Recommendations for the Path Forward

Surviving Invasion: Regaining Native Fish Resilience Following Fish Invasions in a Modified Floodplain Landscape

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