How long do seeds float? The potential role of hydrochory in passive revegetation management

Fryirs, Kirstie; Carthey, Alexandra J. R.

doi:10.1002/rra.3989

Cited by 9 publications

(10 citation statements)

References 68 publications

(153 reference statements)

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“…In the Dongting Lake wetlands, flood water may flush seeds, sediment, and litter to low-elevation sites when the flood rises ( Hou et al., 2012 ). However, seeds may float for thousands of meters before sinking or being deposited, and deposited seeds may be resuspended and deposited downstream or elsewhere in frequently flood-disturbed floodplains ( Gurnell et al., 2008 ; Fryirs & Carthey, 2022 ). Therefore, seed bank density may not differ among macrophyte communities along an elevational gradient in the Dongting Lake wetlands.…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, a low-elevation distributed macrophyte community may require a larger propagule bank to replace shoots after longer periods of submergence. Because seeds are mobile and can be transported over long distances by water, the seasonal patterns of soil seed banks in floodplain wetlands are diverse ( Schneider et al., 2020 ; Fryirs & Carthey, 2022 ). As buds are closely associated with parental plants, the seasonal patterns of bud banks along elevational gradients may reflect the adaptation of macrophytes to flooding disturbance ( Klimesova and Klimes, 2007 ; Chen et al., 2015b ).…”

Section: Introductionmentioning

confidence: 99%

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Belowground seed and bud banks play complementary roles in the potential recruitment of dominant macrophyte communities in a Yangtze River-connected floodplain wetland

et al. 2022

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Both seed and bud banks play important roles in the recruitment and maintenance of macrophyte communities; however, few studies have investigated them simultaneously. We investigated the abundance, species composition, and seasonal patterns of seed and bud banks in two dominant macrophyte communities, Carex and Miscanthus, in the Dongting Lake wetlands. The seed densities of both communities were lower from November (after flooding) to March and increased dramatically before flooding (in May). The bud densities of the two dominant communities peaked in the coldest month of the year (January), decreased markedly in March, and were the lowest before flooding. The seed banks of the two macrophyte communities were mainly composed of annual species and a few perennial species, whereas the bud banks were composed of only dominant perennials. Furthermore, the perennial species present in bud banks did not occur in seed banks. Among the soil variables, the bud densities of both plant communities were negatively associated with soil bulk density, whereas the seed density of the Miscanthus community was positively associated with soil bulk density. Our results suggest that seed and bud banks are complementary in the potential recruitment of macrophyte communities; that is, bud banks regulate the demography of dominant perennials, and seed banks contribute to the recruitment and dispersal of annual species. Given the high abundance of annuals and near absence of the most dominant perennials in the seed bank, the bud banks of dominant perennial species should be more widely used in wetland restoration and management.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Belowground seed and bud banks play complementary roles in the potential recruitment of dominant macrophyte communities in a Yangtze River-connected floodplain wetland

et al. 2022

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“…Unfortunately, our results cannot distinguish between the native and exotic species that are establishing in the riparian corridors of coastal NSW. However, we do know from on-ground vegetation surveys and seedbank analysis that a significant proportion of returning vegetation is exotic (Fryirs & Carthey, 2022;Howell & Benson, 2000;O'Donnell et al, 2015O'Donnell et al, , 2016. While the geomorphic and hydrological benefits of vegetative roughness are evident, the quality of the vegetation is of concern, particularly as it affects the ecosystem services and biodiversity value of riverine ecosystems (Kyle & Leishman, 2009;Naiman & Decamps, 1997).…”

Section: Current Vegetation Distribution In Riparian and In-channel Z...mentioning

confidence: 99%

“…Current vegetation management techniques cannot adequately address this problem because they tend to be local, site specific, labour intensive and expensive. Vegetation management strategies are now needed that can be rolled out across large sites and regions that will not compromise the structural and habitat recovery that is occurring or impact on the potential to build nature-based flood resilience into these systems but will improve biodiversity values while maintaining function (Fryirs et al, 2022;Gonzalez Del Tanago et al, 2021;Richardson et al, 2007;. of these studies are conducted along a single reach or sections of river, for rivers with wide channels and riparian corridors (Daryaei et al, 2020;Duro et al, 2012;Pu et al, 2021).…”

Section: Current Vegetation Distribution In Riparian and In-channel Z...mentioning

confidence: 99%

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Trends in post‐1950 riparian vegetation recovery in coastal catchments of NSW Australia: Implications for remote sensing analysis, forecasting and river management

Zhang

Fryirs

2023

Earth Surf Processes Landf

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Extensive riparian vegetation clearance occurred in many rivers of southeastern Australia throughout the 19th and 20th century, post colonisation. With improvements in river management practices, coincident with a period of minimal flooding, vegetation recovery of riparian corridors has been occurring since the 1980s in all coastal catchments of New South Wales (NSW). However, the catchment‐by‐catchment spatial pattern and temporal trends, trajectories and rates of vegetative recovery remain unknown. We reconstruct a 70‐year time series of change in riparian vegetation coverage for all rivers in coastal catchments of NSW, utilising historical aerial imagery, Landsat and Sentinel data and a manual digitisation and machine learning method. We quantify and statistically analyse decadal trends in woody and non‐woody vegetation coverage along 19 485 km of stream length in 20 catchments. Across the region, there has been, on average, a 40% increase in vegetation coverage along riparian corridors since the 1950s, with some catchments increasing towards a current day coverage of between 60% and 80%. However, the trends vary by subregion and by catchment. An early logarithmic increase occurred up to 2004 on the North coast, and a recent and accelerated exponential increase since 1995 has occurred on the South coast. After a steep initial increase, riparian corridor vegetation coverage has fluctuated on the Central coast since about 1995. We used these linear, exponential and logarithmic regressions to undertake preliminary forecasts of possible future timeframes of riparian vegetation change, based on several climate, management and natural disaster disturbance scenarios. If the current trend continues, riparian vegetation coverage can reach 70% across the region by 2055. However, if management practices change or catastrophic disturbance events such as fire and flood occur, increases in riparian vegetation coverage could be set back by up to 30 to 40 years.

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Tangled webs and spider‐flowers: Phylogenomics, biogeography, and seed morphology inform the evolutionary history of Cleomaceae

Saunders,

Larridon,

Baker

et al. 2024

American J of Botany

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PremiseCleomaceae is an important model clade for studies of evolutionary processes including genome evolution, floral form diversification, and photosynthetic pathway evolution. Diversification and divergence patterns in Cleomaceae remain tangled as research has been restricted by its worldwide distribution, limited genetic sampling and species coverage, and a lack of definitive fossil calibration points.MethodsWe used target sequence capture and the Angiosperms353 probe set to perform a phylogenetic study of Cleomaceae. We estimated divergence times and biogeographic analyses to explore the origin and diversification of the family. Seed morphology across extant taxa was documented with multifocal image‐stacking techniques and morphological characters were extracted, analyzed, and compared to fossil records.ResultsWe recovered a well‐supported and resolved phylogenetic tree of Cleomaceae generic relationships that includes 236 (~86%) species. We identified 11 principal clades and confidently placed Cleomella as sister to the rest of the family. Our analyses suggested that Cleomaceae and Brassicaceae diverged ~56 mya, and Cleomaceae began to diversify ~53 mya in the Palearctic and Africa. Multiple transatlantic disjunct distributions were identified. Seeds were imaged from 218 (~80%) species in the family and compared to all known fossil species.ConclusionsOur results represent the most comprehensive phylogenetic study of Cleomaceae to date. We identified transatlantic disjunctions and proposed explanations for these patterns, most likely either long‐distance dispersals or contractions in latitudinal distributions caused by climate change over geological timescales. We found that seed morphology varied considerably but mostly mirrored generic relationships.

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How long do seeds float? The potential role of hydrochory in passive revegetation management

Cited by 9 publications

References 68 publications

Belowground seed and bud banks play complementary roles in the potential recruitment of dominant macrophyte communities in a Yangtze River-connected floodplain wetland

Belowground seed and bud banks play complementary roles in the potential recruitment of dominant macrophyte communities in a Yangtze River-connected floodplain wetland

Trends in post‐1950 riparian vegetation recovery in coastal catchments of NSW Australia: Implications for remote sensing analysis, forecasting and river management

Tangled webs and spider‐flowers: Phylogenomics, biogeography, and seed morphology inform the evolutionary history of Cleomaceae

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