Sediment seedbanks in grassland on the Magela Creek floodplain, northern Australia

Finlayson, C. Max; Cowie, I. D.; Bailey, B. J.

doi:10.1016/0304-3770(90)90003-4

Cited by 35 publications

(33 citation statements)

References 8 publications

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“…Our results indicate that the seed bank at Palo Verde Marsh is relatively large (i.e., high density). The mean seed bank density found in this study (1,960 individuals/m 2 during drawdown conditions) is comparable to results from monsoonal wetlands in Keoladeo National Park, India (1,100-3,100 individuals/m 2 ; Middleton et al 1991) and the Nyl Flooplain, South Africa (1,300 individuals/m 2 ; Brock and Rogers 1998) but less than densities found in the Magela Creek Floodplain, Australia (8,000-15,400 individuals/m 2 ; Finlayson et al 1990). As in most seasonally-flooded wetlands, most species in the Palo Verde Marsh seed bank germinated better when the soil surface was moist but not flooded.…”

Section: Impact Of Drought and Flooding On The Seed Bank And In Situ supporting

confidence: 74%

Coastal Freshwater Wetland Plant Community Response to Seasonal Drought and Flooding in Northwestern Costa Rica

2011

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Wetlands in tropical wet-dry climates are governed by distinct and extreme seasonal hydrologic fluctuations. In this study, we investigated the plant community response to seasonal flooding and drought in Palo Verde Marsh, Costa Rica. Climate change models for the region predict reduced rainfall and a drier wet season which would likely alter seasonal hydrologic cycles and prompt vegetation change. We quantified compositional change following disturbance emphasizing seasonal differences in plant life-form abundance across life history stages via standing vegetation, seed bank, and seedling recruitment measurements. Whereas the dry season standing vegetation was dominated by emergent species, aquatic species (floating-rooted, free-floating, and submerged life forms) were more dominant during the wet season. Seed bank and seedling recruitment measurements indicated that many species are resilient with life history traits that enable them to respond rapidly to extreme hydrologic filters. Interestingly, species richness was highest during seasonal flooding. Our results highlight the importance of early-wet season rainfall for plant regeneration and community change. Our findings also indicate that a drier future would likely have a large impact upon wetland plant communities with a decrease in species richness and an increase in the abundance of drought-tolerant emergent species.

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Section: Impact Of Drought and Flooding On The Seed Bank And In Situ supporting

confidence: 74%

Coastal Freshwater Wetland Plant Community Response to Seasonal Drought and Flooding in Northwestern Costa Rica

2011

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“…Graminoids and forbs were the most abundant growth forms in the seed bank (similar to findings of other riparian studies; Harmon and Franklin 1995;Hanlon et al 1998;Abernethy and Willby 1999;Pettit and Froend 2001) and would be favored by the donor bank method. Although a few species contributed to the majority of germinants in the seed banks (also observed in other studies; Finlayson et al 1990;Abernethy and Willby 1999), several are species that establish on freshly disturbed sites, and thus may be adapted to the conditions initially created by restoration disturbance. …”

Section: Restoration Implications For Ramsey Canyonmentioning

confidence: 77%

“…Riparian seed bank studies are relatively few in number (Goodson et al 2001), and many have been conducted on large alluvial river systems (Finlayson et al 1990;Harmon and Franklin 1995;Abernethy and Willby 1999;Pettit and Froend 2001;Goodson et al 2002). Comprehensive seed bank investigations on smaller, bedrock-controlled, headwater systems are needed.…”

Section: Introductionmentioning

confidence: 99%

Soil seed banks of two montane riparian areas: implications for restoration

Richter

Stromberg

2005

Biodivers Conserv

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“…Brock, personal communication) and for Lythrum salicaria (410000 seeds m-2) in North America (Welling and Becker 1990). There are more seeds of L. peruviana per square metre in the Botany Wetlands than the totals for all species in the wetlands of the Magela Creek system (Finlayson et al 1990). When the number of seeds retained on the old stems is taken into consideration, however, the number of seeds of L. peruviana is as high as the numbers for Lythrum salicaria (Welling and Becker 1990), an invasive species of North American wetlands.…”

Section: Seeds and Seedlingsmentioning

confidence: 96%

Ludwigia peruviana (Onagraceae) in the Botany Wetlands near Sydney, Australia

Jacobs¹,

Perrett²,

Sainty³

et al. 1994

Mar. Freshwater Res.

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Ludwigia peruviana is an aquatic shrubby species introduced from the Americas and spreading to wetlands in coastal south-eastem Australia. It has become dominant, replacing much of the former vegetation in the Botany Wetlands, a series of shallow urban swamps and lakes near Sydney, Australia. Studies of L. peruviana were essential to the development of a management plan for the Botany Wetlands. Ecological studies were conducted in situ and supplemented by a series of germination and growth experiments in controlled environments. Flowering peaked in early autumn. Seed production for 1990-91 was -450000 seeds m-2 and there was also -65000 seeds m-2 in the soil seed bank and -300000 seeds m-2 in old fruits that remained on the stems over winter. The seeds are -0.8 mm long, weigh -0.05 mg, are hydrophobic, usually germinate while afloat, and are easily dispersed by water, machinery and birds. Viability of fresh seed was 99% (tetrazolium dye test), and -20% of seeds were dormant. Dormancy appeared to break down within two years. Propagation and dispersal may also occur by means of stem pieces that produce new shoots. New plants from seed, seedlings or stem fragments may become established on strand lines or form floating islands that may eventually become stranded. Management needs to focus on control of the seedlings and soil seed bank.

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Sediment seedbanks in grassland on the Magela Creek floodplain, northern Australia

Cited by 35 publications

References 8 publications

Coastal Freshwater Wetland Plant Community Response to Seasonal Drought and Flooding in Northwestern Costa Rica

Coastal Freshwater Wetland Plant Community Response to Seasonal Drought and Flooding in Northwestern Costa Rica

Soil seed banks of two montane riparian areas: implications for restoration

Ludwigia peruviana (Onagraceae) in the Botany Wetlands near Sydney, Australia

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