Soil seed bank dynamics in response to an extreme flood event in a riparian habitat

Osunkoya, Olusegun O.; Ali, Sadiq; Nguyen, Thi Tuyet Hanh; Perrett, Christine; Shabbir, Assad; Navie, S. C.; Belgeri, Amalia; Dhileepan, K.; Adkins, Steve W.

doi:10.1007/s11284-014-1198-2

Cited by 13 publications

(9 citation statements)

References 36 publications

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“…), it is possible that in very fast moving water bodies, such as those of a flood event of January 2011 in Central and South East Queensland (Osunkoya et al . ), or in irrigation cannels and in some river systems, cypselae can be moved vast distances prior to deposition along river banks where they will germinate.…”

Section: Discussionmentioning

confidence: 99%

“…Also, anecdotal reports from New South Wales, Australia, indicated that major floods in Queensland during 2010 and 2011 distributed this weed further (Osunkoya et al . ; Mainali et al . ).…”

Section: Introductionmentioning

confidence: 99%

“…Such studies demonstrate that natural spread of parthenium weed by water bodies is possible and in certain circumstances may represent a major mechanism for local spread during flooding and long distance spread in rivers and irrigation channel systems (Osunkoya et al . ; Parsons & Southwell ). However, the knowledge of how many seeds are carried away and over what distance remains uncertain.…”

Section: Introductionmentioning

confidence: 99%

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Spread pathways of the invasive weed Parthenium hysterophorus L.: The potential for water dispersal

et al. 2019

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Parthenium hysterophorus L. (Asteraceae) utilises multiple mechanisms to facilitate its dispersal. It has been speculated that the cypsela, the propagule of this species, can be dispersed by water under varying environmental conditions. Four experiments were conducted to test this hypothesis, using simulated shaking and immersion to test floating ability and viability of the propagule in water. The influence of the acidity of the immersion medium on cypsela viability was also examined. Our results revealed that the freshly harvested cypselae could float on river water for at least 20 days, although around 80% sank within a week if moderate or severe turbulence was applied. Sinkage was observed to be more rapid in naked seeds (within a day) than in cypsela (within a week). On still water surfaces, germination occurred within a week but extended to 1.5 weeks under turbulent conditions due to sinkage. In river water, initial germination of floating cypselae was greater (70%) under illuminated conditions as compared to dark conditions (20%). The viability of immersed cypselae was found to remain high in distilled water for 45 days, when immersion was in cool conditions (10 or 15°C). However, in moderate (20 and 24°C) or warm (25 and 30°C) conditions, the rate of viability loss increased, and at 34°C, around 50% of the cypselae died after 20 days of immersion. Similar trends for cypselae longevity were observed in studies using river and pond water; viability loss was faster, especially in pond water. In summary, a proportion of cypselae will float in turbulent water and could be carried significant distances in river systems. Immersed cypselae can remain viable for weeks and can germinate on contact with soil. Water bodies or floods are therefore considered as important pathways in parthenium weed dispersal; hence, post-flood monitoring is strongly recommended to minimise its spread.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spread pathways of the invasive weed Parthenium hysterophorus L.: The potential for water dispersal

et al. 2019

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“…Any sudden or excessive disturbance would cause changes of seed rain, the seed soil bank and plant community. Their relationships also would be changed and the plant community thus would exhibit changes in species composition or even reductions in diversity or species richness (Osunkoya et al 2014;del Castillo and Rios 2008). The dramatic change of the water-level fluctuation pattern in the reservoir resulted in a severe degeneration of seed rain, the soil seed bank and plant community in the hydro-fluctuation zone Lu, Li, Jiang et al 2010;Wang et al 2010;Wu et al 2016).…”

Section: Spatial Distribution Of Seed Rain and Seed Bank And Their Rementioning

confidence: 99%

Seed rain and seed bank of a draw-down zone and their similarities to vegetation under the regulated water-level fluctuation in Xiangxi River

Chen

Zhang

et al. 2020

Journal of Freshwater Ecology

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Construction of the Three Gorges Reservoir converted areas of the original terrestrial ecosystem along the shores into a drawdown zone with a fluctuating water-level at an elevation ranging between 145 and 175 m. The water-level fluctuation is regulated against the normal seasonal flooding with summer emergence and winter submergence. We investigated the seed rain and soil seed banks along elevational gradients of the Xiangxi zone in the reservoir to explore the characteristics of species composition and spatial distribution of seed rain and soil seed bank, and their similarities with standing vegetation under the regulated water-level fluctuation. The results showed that the seed rain and soil seed bank comprised 36 and 50 species of plants, respectively. These were predominantly annual herbaceous plants, which accounted for 54.02 and 66.0% of the seed rain and soil seed bank, respectively, with an average density of 445.16 ± 49.97 and 7322.18 ± 678.44 seeds/m 2 , respectively. The regulated water-level fluctuation resulted in greater species diversity and seed density of seed rain and soil seed bank in the middle and upper elevations of the zone than that of the lower elevations. The similarity coefficient between seed rain and seed bank, seed bank and extant vegetation, seed rain and extant vegetation was 0.488, 0.373 and 0.466, respectively. Effects of the regulated water-level fluctuation on the species compositions and spatial distribution of the seed rain and seed bank, and their similarities with existing vegetation were further discussed by contrast with the current research in the same field.

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“…However, when the water-level fluctuation pattern alternates, species composition and the quantity of germinating seeds in the soil seed bank change accordingly (Howard & Wells, 2009;Nicol et al, 2003). Such a change may be due to occasional changes in water-level fluctuation pattern (Lucas et al, 2012;Osunkoya et al, 2014), but when the water-level fluctuation pattern had stabilized, alterations in germination rates of the soil seed bank were observed (Dixon, 2003;Nielsen, Podnar, Watts, & Wilson, 2012).…”

Section: Effects Of Reversal Seasonal Submersion On the Germinationmentioning

confidence: 99%

Effects of reverse seasonal submersion on the germination and persistence of soil seed banks in hydro‐fluctuation belts

Chen

et al. 2018

Ecohydrology

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The construction of the Three Gorges Dam has resulted in the occurrence of reverse seasonal water‐level fluctuations. The species composition and quantity of riparian soil seed banks collected from four hydro‐fluctuation belts were assessed by simulating different submersion cycles to determine the effects of reverse seasonal water‐level fluctuations on the germination and persistence of soil seed banks in the Three Gorges Reservoir Region. Results showed the number of species that germinated from the soil seed bank decreased with submersion. The number of germinated seeds in soil seed banks after submersion for 7 months in Xingshan, Zigui, Wanzhou, and Zhongxian decreased by 60%, 53%, 57%, and 57%, respectively, relative to the control. The species diversity index and seed density of germinated seeds in soil seed banks also significantly decreased with prolongation of submersion time. Seed density decreased by 93%, 83%, 76%, and 72%, respectively, after 7 months of submersion. Species composition and dominance within the soil seed bank changed over time due to submersion. In general, reverse seasonal submersion negatively impacts the germination and persistence of soil seed banks. The response of soil seed bank germination and persistence to reverse seasonal submersion became the key factor determining the heterogeneity in the spatial distribution of the soil seed bank in hydro‐fluctuation belts due to the large differences in submersion time between areas at various elevations.

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Soil seed bank dynamics in response to an extreme flood event in a riparian habitat

Cited by 13 publications

References 36 publications

Spread pathways of the invasive weed Parthenium hysterophorus L.: The potential for water dispersal

Spread pathways of the invasive weed Parthenium hysterophorus L.: The potential for water dispersal

Seed rain and seed bank of a draw-down zone and their similarities to vegetation under the regulated water-level fluctuation in Xiangxi River

Effects of reverse seasonal submersion on the germination and persistence of soil seed banks in hydro‐fluctuation belts

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