Formation of tussocks by sedges: effects of hydroperiod and nutrients

Lawrence, Beth A.; Zedler, Joy B.

doi:10.1890/10-1759.1

Cited by 47 publications

(28 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unfortunately, in the Sanjiang Plain, farm fields converted from sedge meadows are nearly devoid of keystone tussock-forming species. Tussocks are important to sedge meadows because these create microtopography and surface area (Peach & Zedler 2006;Lawrence & Zedler 2011). In our study, tussock-forming sedges were absent in the seed banks of the farmed and restored sites, and the formation of tussocks appeared to be seed limited.…”

Section: Discussionsupporting

confidence: 40%

Restoration Potential of Sedge Meadows in Hand‐Cultivated Soybean Fields in Northeastern China

Wang

Middleton

Jiang

2013

Restoration Ecology

View full text Add to dashboard Cite

Sedge meadows can be difficult to restore from farmed fields if key structural dominants are missing from propagule banks. In hand-cultivated soybean fields in northeastern China, we asked if tussock-forming Carex and other wetland species were present as seed or asexual propagules. In the Sanjiang Plain, China, we compared the seed banks, vegetative propagules (below-ground) and standing vegetation of natural and restored sedge meadows, and handcultivated soybean fields in drained and flooded conditions. We found that important wetland species survived cultivation as seeds for some time (e.g. Calamogrostis angustifolia and Potamogeton crispus) and as field weeds (e.g. C. angustifolia and Phragmites australis). Key structural species were missing in these fields, for example, Carex meyeriana. We also observed that sedge meadows restored without planting or seeding lacked tussock-forming sedges. The structure of the seed bank was related to experimental water regime, and field environments of tussock height, thatch depth, and presence of burning as based on Nonmetric Multidimensional Scaling analysis. To re-establish the structure imposed by tussock sedges, specific technologies might be developed to encourage the development of tussocks in restored sedge meadows.

show abstract

Section: Discussionsupporting

confidence: 40%

Restoration Potential of Sedge Meadows in Hand‐Cultivated Soybean Fields in Northeastern China

Wang

Middleton

Jiang

2013

Restoration Ecology

View full text Add to dashboard Cite

show abstract

“…The first step in planning to restore a wetland to a species‐rich assemblage resembling a native community requires the selection of dominant species. Carex stricta is a suitable restoration target because it forms tussocks, supports growth of other plants, stores carbon, and tolerates nutrient‐rich conditions that are common to many wetland restoration sites (Werner & Zedler 2002; Crain & Bertness 2005; Peach & Zedler 2006; Frieswyk et al 2007; Gallagher 2010; Lawrence & Zedler 2011). After selecting a community type and dominant species, companion species should be chosen for their ability to coexist in the long term.…”

Section: Discussionmentioning

confidence: 99%

Identifying Preferential Associates to Initiate Restoration Plantings

Johnston

Zedler

2011

Restoration Ecology

Self Cite

View full text Add to dashboard Cite

Ecological restoration typically aims to re-establish dominant plant species and their native associates, despite the lack of guidance on which associates to introduce initially. Analysis of naturally occurring plant communities can provide criteria to shorten the list of species that are associated with dominants, in order to focus revegetation efforts on species likely to establish. Using the example of sedge meadows, we evaluated wetland vegetation data from Laurentian Great Lakes wetlands to identify "preferential associates," that is, species that co-occur more frequently than expected based on their overall abundance. A total of 176 taxa occurred within the two hundred and thirty-nine 1 × 1 m 2 plots in 48 wetlands that contained Carex stricta, a widespread tussock-forming sedge. Of 58 species that co-occurred with C. stricta where it was dominant (≥50% plot cover), we identified 26 associates using Bray-Curtis similarities and we determined that 12 of the 26 were preferential using an electivity index. The electivity index identified preferential associates even when they occurred infrequently or had low mean cover per plot. We provide guidance on how to initiate restoration with preferential associates.

show abstract

“…In particular, zero values of water depth in drained habitat provide no information about differences in water depths among shoots at that site when it is flooded. Water depths and elevations are often used as proxies for one another in studies by ecohydrologists and aquatic plant ecologists (e.g., Watts et al 2010; Lawrence and Zedler 2011; also see Eppley 2001 and Johnston et al 2001 for similar approaches). Elevation measurements were made using a Leica Disto D8 (Leica Geosystems, St. Gallen, Switzerland), a laser range finder that can estimate elevations at the millimeter scale by measuring the distance and angle between a fixed point and the sampled shoot.…”

Section: Methodsmentioning

confidence: 99%

No evidence for niche segregation in a North American Cattail (Typha) species complex

McKenzie‐Gopsill¹,

Kirk²,

Drunen³

et al. 2012

Ecology and Evolution

View full text Add to dashboard Cite

Interspecific hybridization can lead to a breakdown of species boundaries, and is of particular concern in cases in which one of the parental species is invasive. Cattails (Typha spp.) have increased their abundance in the Great Lakes region of North America over the past 150 years. This increase in the distribution of cattails is associated with hybridization between broad-leaved (Typha latifolia) and narrow-leaved cattails (T. angustifolia). The resulting hybrids occur predominantly as F1s, which are known as T. × glauca, although later-generation hybrids have also been documented. It has been proposed that in sympatric populations, the parental species and hybrids are often spatially segregated according to growth in contrasting water depths, and that this should promote the maintenance of parental species. In this study, we tested the hypothesis that the two species and their hybrids segregate along a water-depth gradient at sites where they are sympatric. We identified the two parental species and their hybrids using molecular genetic markers (SSR), and measured shoot elevations (a proxy for water depth) at 18 sites in Southern Ontario, Canada. We found no evidence for niche segregation among species based on elevation. Our data indicate that all three lineages compete for similar habitat where they co-occur suggesting that there is potential for an overall loss of biodiversity in the species complex, particularly if the hybrid lineage is more vigorous compared to the parental species, as has been suggested by other authors.

show abstract

Formation of tussocks by sedges: effects of hydroperiod and nutrients

Cited by 47 publications

References 66 publications

Restoration Potential of Sedge Meadows in Hand‐Cultivated Soybean Fields in Northeastern China

Restoration Potential of Sedge Meadows in Hand‐Cultivated Soybean Fields in Northeastern China

Identifying Preferential Associates to Initiate Restoration Plantings

No evidence for niche segregation in a North American Cattail (Typha) species complex

Contact Info

Product

Resources

About