Simulating the effect of environmental flow duration on seedling emergence from riparian seed banks of the Upper Hunter River, New South Wales

Stone, Luke; Fryirs, Kirstie; Leishman, Michelle R.

doi:10.1002/rra.3376

Cited by 6 publications

(3 citation statements)

References 71 publications

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“…Moving laterally from the river channel to the riparian zone, the study of Stone, Fryirs, and Leishman (2020) shows how passive riparian revegetation techniques are important tools in river rehabilitation. Results from emergence experiments show the duration of inundation to influence seed germination for most riparian vegetation species, but variations between species complicate successful recruitment.…”

Section: Examples Of Riverine Landscapes Water Resource Developmentmentioning

confidence: 99%

Riverine landscapes, water resource development and management: A view from downunder

Thoms

Rose²,

Dyer

2020

River Research & Apps

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A perfect storm refers to an event in which a rare combination of circumstances significantly exacerbates the event. River science faces a potential perfect storm through the emergence of several factors. First, pronounced and persistent human modifications to catchments and rivers have resulted in regime shifts-a state change of riverine landscapes. Anthropocene Rivers have different ecosystem structures and functions and cannot return to their "natural state." This new regime challenges accepted river science paradigms, especially those focused on traditional models of stressor-response. Second, river science is rapidly transitioning from a multidisciplinary activity focused on biophysical structures and functions, to rivers as social-ecological systems. The rise of interdisciplinary research not only recognizes the high degree of coupling between natural and human components, but also the generation of river knowledge that is more socially accountable. Third, the application of scientific knowledge to solve "wicked" river problems continues. However, increasingly river managers are faced with decisions in an environment of high uncertainty about what they are managing, and the potential impacts of their actions. The manuscripts in this Special Issue highlight a potential perfect storm facing Australian riverine landscapes. The issue is dedicated to Professor Wayne Erskine; an intellectual leader of Australian river science for over 20 years. Focussed on the science and management of Australian Rivers, the 14 manuscripts broadly cover the areas in which Wayne made his greatest contributions: river processes and management. Each has a strong foundation in theory and has application in helping to solve some of the complex problems faced by Australia's river managers across a range of spatial and temporal scales.

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Section: Examples Of Riverine Landscapes Water Resource Developmentmentioning

confidence: 99%

Riverine landscapes, water resource development and management: A view from downunder

Thoms

Rose²,

Dyer

2020

River Research & Apps

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“…Germination rates for A. stenophylla without pods were higher in the I40 treatment than in the I20 treatment, showing that extended flooding improves germination rates. Inundation has also been found to improve germination rates of other riverine Acacia species such as Acacia salicina and Acacia parvipinnula (Stone et al 2020). Two germinants from seeds without pods were present while fully submerged in the water in the I40 treatment from Day 31, and the number of germinants increased following recession, demonstrating that A. stenophylla seeds are able to germinate under water to a depth of 50 mm and after flood events.…”

Section: Discussionmentioning

confidence: 89%

Seed germination requirements of an Australian semi-arid floodplain

et al. 2022

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Plants that occur on floodplains in dryland regions often use floods to disperse and germinate seeds, which establish during and following flooding events. Acacia stenophylla (river cooba) is a perennial tree, common in the riparian habitats of the Murray-Darling Basin, Australia. The aims of this study were to (1) determine the relationship between seed germination and seedling establishment of A. stenophylla and hydrological conditions, (2) determine the buoyancy of its seeds and, hence, ability to disperse by hydrochory and (3) provide recommendations on the hydrological requirements for A. stenophylla recruitment. Seedling recruitment data collected between 2014 and 2020 on the floodplain of the lower Lachlan River were compared with time since flooding. In a glasshouse experiment, seeds of A. stenophylla within their pods and with their pods removed were exposed to one of five experimental treatments (rainfall, soaked soil, and inundated for 20 and 40 days), over a period of 50 days. A. stenophylla germinated during and following flooding and following high rainfall. Seeds in pods floated for 8 days. A. stenophylla establishes during and following flooding and requires 1 month of flooding followed by flood recession to maximise seed germination. This research contributes to our broader understanding of the reproductive biology of one of the less studied Acacia species.

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“…A study linking hydro period with vegetation response showed that wetland species richness and density was related to flood frequency (Battaglia and Collins, 2006;Shoemaker and Ervin, 2019). Other studies found no relationship between flood frequency, species richness and density in soil seed banks (Capon and Brock, 2006;Webb et al, 2006;Stone et al, 2018;Baskin, Baskin and Chester, 2019) or fewer species in low flood frequency zones (Capon, 2007). Other than flooding, human disturbances such as cultivation in wetlands have increased around the world (McCartney et al, 2010;Rebelo et al, 2010;Chen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Natural vegetation regeneration from soil seed banks in the cultivated edges of Sudd wetlands in Juba, Southern Sudan

Esaete

Bongo

Lado

et al. 2021

EAJSTI

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Soil seed banks are important for regeneration of degraded wetlands ecosystems. The Sudd wetlands of Juba city have long been encroached for crop cultivation. Seedling germination was monitored in a greenhouse to establish possible natural regeneration in Mindiari, Rejaf and Roton wetlands in the Sudd. Sixty-four species germinated from the soil seed bank of which 12.5% were dominated by Cyperus difformis and Typha capensis. The findings showed that median wetland species richness in Mindiari was 1.5 (interquartile range = 0.75?3.5), Rejaf 2.5 (interquartile range = 1.0 ? 4.0), Roton 3 (interquartile range = 1.0 ? 5.0) while median Shannon-Wiener diversity was 1.5 (1.14 ?1.73), 1.43 (1.01?1.66), 1.15 (0.98?1.67) for Mindiari, Rejaf and Roton respectively. Both the median seed species richness and diversity were not significantly different among the study wetlands. The median of seed density (56.1) was significantly higher in Roton than in Mindiari (36.7) and Rejaf (29.4) wetlands. The NMDS results showed that species composition of Mindiari and Rejaf was different from Roton. It is concluded that growing crops in wetlands did not influence species richness and diversity but it reduced seed density and altered species composition. Although wetland species were not significantly different in the three-wetland categories, dominance of canopy species belonging to Typhaceae and Cyperaceae indicates that these species are resilient to cultivation and could facilitate natural regeneration of cultivated wetlands edges of the Sudd region in Juba. Further research should examine effect of cultivation duration and flooding regimes on soil seed bank species richness, diversity, and density and composition.

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Simulating the effect of environmental flow duration on seedling emergence from riparian seed banks of the Upper Hunter River, New South Wales

Cited by 6 publications

References 71 publications

Riverine landscapes, water resource development and management: A view from downunder

Riverine landscapes, water resource development and management: A view from downunder

Seed germination requirements of an Australian semi-arid floodplain

Natural vegetation regeneration from soil seed banks in the cultivated edges of Sudd wetlands in Juba, Southern Sudan

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